Re: [CentOS] please help

[Alexander Marz]

Maybe this will help?

http://distrowatch.com/table.php?distribution=centos


Alex
On 2011-09-01, at 11:25 PM, Liang Arsalan wrote:

> i can't fine features of CentOs on web
> 
> -- 
> _Best Regards_
> Buddyexpress
> Administrator
> Liang
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Re: [CentOS] please help

[Liang Arsalan]

i can't fine features of CentOs on web

-- 
_Best Regards_
Buddyexpress
Administrator
Liang
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Re: [CentOS] New wireless controller

[Barry Brimer]

> I just installed an Asus PCE-n13 wireless card into one of my CentOS 5.6 
> systems.  It uses the RaLink 2680 chip set and I was able to get the driver 
> loaded using modprobe rt2x00pci.ko.  I saw no error and now see that the 
> module is loaded along with mac80211 and other dependencies.
>
> Now I need to know how to create the wlan0 device.  I can find nothing via 
> Google searches on how to create that device.  I assumed the driver would do 
> that upon loading, but now I expect some ioctl to the driver command may be 
> required.
>
> I created an ifcfg-wlan0 file, but of course ifup wlan0 always returns device 
> not found.
>
> Can somebody tell me where to start on getting the wlan0 device created?

What is the output of iwconfig?

What is the output of ifconfig -a
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Re: [CentOS] please help

[Cliff Pratt]

Why? Any platform can be used for web development.

If you want to learn more about CentOS, visit the web site.

Cheers,

Cliff

On Fri, Sep 2, 2011 at 4:59 PM, Liang Arsalan  wrote:
> i am a user of windows and use little bit ubuntu
> my friend told me to use centos for web development
> i have question that what is features of centos.
> thank you
> --
> _Best Regards_
> Buddyexpress
> Administrator
> Liang
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[CentOS] please help

[Liang Arsalan]

i am a user of windows and use little bit ubuntu
my friend told me to use centos for web development
i have question that what is features of centos.
thank you
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Administrator
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Re: [CentOS] dealing with spoofing

[Ned Slider]

On 01/09/11 22:10, Always Learning wrote:
>
> On Thu, 2011-09-01 at 12:43 -0700, Scott Silva wrote:
>
>> I get TONS of spam with legitimate DKIM signatures...
>
> How is that possible ?
>

Because spammers know how to sign their email with DKIM signatures too, 
same as spammers can set an SPF record in DNS.

These are NOT specifically anti-spam techniques, they are designed to 
prevent forgeries, not spam per se.



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Re: [CentOS] hfsplus.ko

[Ned Slider]

On 01/09/11 22:05, Jerry Geis wrote:
>I'm not all that excited about using another repo.
>
> I changed the makefile to:
> obj-m += hfsplus.o
>



>
> I extracted the source for 2.6.32.46 and found the fs/hfsplus directory.
> The above files are present. I changed the makefile to the above.
>
> All the files compile - however I dont know how to make the hfsplus.ko
> What step does that take?
>
> Thanks, ( I know most people just use the repo - but I can't do that).
>

The elrepo.org module uses the source code from the RHEL6 kernel and 
builds that rather than trying to backport a module from the upstream 
kernel. Remember, the source code is in the RHEL6 kernel, it's just not 
enabled by default.

Why don't you take a look at the elrepo SRPM and audit/rebuild it for 
your own use - a packaged solution is nearly always the correct solution 
(as KB pointed out recently elsewhere on this list), and by building a 
kABI-tracking kmod RPM package you will likely never need to update it 
again (otherwise you will need to recompile the module for every kernel 
update). Or you can use the SRPM as a template to create your own 
package using your kernel-2.6.32.46 source.

You should also consider filing a bug report upstream and make a case 
for hfsplus inclusion in the RHEL6 kernel. It's not unheard of for Red 
Hat to turn modules back on that they had previously disabled.

If you need any more specific help/assistance, pop over to the elrepo 
mailing lists and Akemi or I will be more than happy to assist you there.

Hope that helps.



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[CentOS] New wireless controller

[Emmett Culley]

I just installed an Asus PCE-n13 wireless card into one of my CentOS 5.6 
systems.  It uses the RaLink 2680 chip set and I was able to get the driver 
loaded using modprobe rt2x00pci.ko.  I saw no error and now see that the module 
is loaded along with mac80211 and other dependencies.

Now I need to know how to create the wlan0 device.  I can find nothing via 
Google searches on how to create that device.  I assumed the driver would do 
that upon loading, but now I expect some ioctl to the driver command may be 
required.

I created an ifcfg-wlan0 file, but of course ifup wlan0 always returns device 
not found.

Can somebody tell me where to start on getting the wlan0 device created?

Emmett
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Re: [CentOS] Centos 6, KDE 4: canot manage network

[Michael D. Berger]

On Fri, 02 Sep 2011 01:04:14 +, Michael D. Berger wrote:

[...]
> 
> It is a laptop. I have not been able to get it to work on the command
> line.  Perhaps it would help if I remove NetworkManager? Also, there is
> probably not enough in my ifcfg-wlan0.  I can see what is my ifcfg-eth0,
> but what do I put if the network is unknown (I am traveling) or I am
> using DHCP?  Do you have a reference I can read?
> 
> Thanks,
> Mike.

I found some stuff that looks helpful on the web; I'll try it
tomorrow (-0400).  Since it involves stopping wpa_supplicant,
I will have to stop NetworkManager, possibly with yum remove,
unless I can find another way.  Most important is the command
dhclient, which is used at the end of the sequence.

Mike.


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Re: [CentOS] No buffer space available - loses network connectivity

[Mailing Lists]

I haven't worked with xen in a few months, but I'd highly suggest looking at
the xen host server itself instead of the vps.  Setup some sort of
monitoring on the VPS, coordinate the time it looses internet connection to
the host server logs, maybe it'll provide some insight.  Unless, its this
VPS.  Was this built off of XEN's templates or a P2V system?

On Thu, Sep 1, 2011 at 12:36 AM, Sherin George wrote:

> Hi,
>
> I have a centos 5.6 xen vps which loses network connectivity once in a
> while with following error.
>
> =
> -bash-3.2# ping 8.8.8.8
> PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
> ping: sendmsg: No buffer space available
> ping: sendmsg: No buffer space available
> ping: sendmsg: No buffer space available
> ping: sendmsg: No buffer space available
> =
>
> All my investigation so far led me to believe that it is because
> skbuff cache getting full.
>
> =
>
> PROC-SLABINFO
> skbuff_fclone_cache22730851271 : tunables   54
> 278 : slabdata 44 44  0
> skbuff_head_cache   1574   1650256   151 : tunables  120   60
>  8 : slabdata110110  0
>
> SLAB-TOP
>  Active / Total Objects (% used): 2140910 / 2200115 (97.3%)
>  Active / Total Slabs (% used)  : 139160 / 139182 (100.0%)
>  Active / Total Caches (% used) : 88 / 136 (64.7%)
>  Active / Total Size (% used)   : 512788.94K / 520252.14K (98.6%)
>  Minimum / Average / Maximum Object : 0.02K / 0.24K / 128.00K
>
>  OBJS ACTIVE  USE OBJ SIZE  SLABS OBJ/SLAB CACHE SIZE NAME
> 664000 620290  93%0.09K  16600   40 66400K buffer_head
> 409950 408396  99%0.21K  22775   18 91100K dentry_cache
> 343056 340307  99%0.08K   7147   48 28588K
> selinux_inode_security
> 338590 336756  99%0.74K  677185270872K ext3_inode_cache
> 143665 143363  99%0.06K   2435   59  9740K size-64
>  99540  99407  99%0.25K   6636   15 26544K size-256
>  96450  96447  99%0.12K   3215   30 12860K size-128
>  60858  60858 100%0.52K   86947 34776K radix_tree_node
>  12420  11088  89%0.16K540   23  2160K vm_area_struct
>  5895   4185  70%0.25K393   15  1572K filp
>  4816   3355  69%0.03K 43  112   172K size-32
>  2904   2810  96%0.09K 66   44   264K sysfs_dir_cache
>  2058   1937  94%0.58K3436  1372K proc_inode_cache
>  1728   1215  70%0.02K 12  14448K anon_vma
>  1650   1590  96%0.25K110   15   440K skbuff_head_cache
>  1498   1493  99%2.00K7492  2996K size-2048
>  1050   1032  98%0.55K1507   600K inode_cache
>   792767  96%1.00K1984   792K size-1024
>   649298  45%0.06K 11   5944K pid
>   600227  37%0.09K 15   4060K journal_head
>   590298  50%0.06K 10   5940K delayacct_cache
>   496424  85%0.50K 628   248K size-512
>   413156  37%0.06K  7   5928K fs_cache
>   404 44  10%0.02K  2  202 8K biovec-1
>   390293  75%0.12K 13   3052K bio
>   327327 100%4.00K3271  1308K size-4096
>   320190  59%0.38K 32   10   128K ip_dst_cache
>   308227  73%0.50K 447   176K skbuff_fclone_cache
>   258247  95%0.62K 436   172K sock_inode_cache
>   254254 100%1.84K1272   508K task_struct
>   252225  89%0.81K 289   224K signal_cache
>   240203  84%0.73K 485   192K shmem_inode_cache
>   204204 100%2.06K 683   544K sighand_cache
>   202  4   1%0.02K  1  202 4K revoke_table
>   195194  99%0.75K 395   156K UDP
>   159 77  48%0.07K  3   5312K eventpoll_pwq
>   145139  95%0.75K 295   116K files_cache
>   144 41  28%0.02K  1  144 4K journal_handle
>   140140 100%0.88K 354   140K mm_struct
>   140 77  55%0.19K  7   2028K eventpoll_epi
>   135135 100%2.12K1351   540K kmem_cache
>   121 45  37%0.69K 11   1188K UNIX
>   119114  95%0.52K 17768K idr_layer_cache
>   118 41  34%0.06K  2   59 8K blkdev_ioc
>   112 32  28%0.03K  1  112 4K tcp_bind_bucket
>   110 56  50%0.17K  5   2220K file_lock_cache
>   106 35  33%0.07K  2   53 8K avc_node
>   105 98  93%1.50K 215   168K TCP
>   105100  95%1.04K 157   

Re: [CentOS] (c 5.6) Running 2 versions of Apache ?

[Always Learning]

On Mon, 2011-08-29 at 15:57 -0600, Corey Henderson wrote:

> Or install a security module to do that for you. One that I've written
> that is nearing the end of its beta:
> 
> https://github.com/cormander/tpe-lkm
> 
> In some cases, you can even tell it to let apache not exec anything at
> all, if you're not running cgi scripts or bytecode php deployments (zend,
> etc).

Corey,

What do you mean by 'bytecode php deployments' ?  Ordinary PHP scripts ?

Thanks,

Paul.


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Re: [CentOS] (c 5.6) Running 2 versions of Apache ?

[Always Learning]

On Mon, 2011-08-29 at 16:24 -0400, John Hinton wrote:

> If you can get a good list of what is requested, such as the one started 
> above, and 'if' none of those pages exist, you can use modrewrite to 
> redirect them to 127.0.0.1. :) Effectively sending the request back to 
> themselves. That irritates them. Can be done on a per domain basis or 
> serverwide for those regular attempts into what might exist on any 
> server. For instance, I regularly see phpmyadmin references. I don't run 
> that on any servers, but they come looking.

Thank you.

I've done it server-wide which extends protection to the virtual hosts.

  RedirectMatch 301 ^(.*)admin(.*)$   http://127.0.0.1/hacker-alert

Paul.


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Re: [CentOS] CentOS 6 packages

[Mailing Lists]

digiKam is found, I had epel, rpm forge, and base CentOS repos... others not
by default, maybe if you search http://rpm.pbone.net/

On Wed, Aug 31, 2011 at 6:30 PM, CS DBA  wrote:

> Hi all;
>
> does anyone know if the following packages are available (via yum) for
> CentOS 6 and if so which repo they come from?
>
> Thanks in advance...
>
>
> kmymoney
> darktable
> digiKam
>
>
>
> --
> -
> Kevin Kempter   -   Constent State
> A PostgreSQL Professional Services Company
>   www.consistentstate.com
> -
>
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Re: [CentOS] Yum Update Errors

[Akemi Yagi]

On Thu, Sep 1, 2011 at 1:05 PM, Lee Perez  wrote:
> Afternoon All,
>
> Just ran yum update and it burped on the following:
>
> Package xulrunner.i386 0:1.9.2.20-3.el5_7 set to be updated
> --> Processing Conflict: firefox conflicts xulrunner >= 1.9.2.19
>
> firefox-3.6.18-1.el5.centos.i386 from installed has depsolving problems
>  --> firefox conflicts with xulrunner

> I have never had any troubles updating my box before.  Anybody else seen
> this yet? Or what am I doing wrong.  Just woke up, please cut me some
> slack.

Yes, I saw the same error. Looks like the issue has been corrected.
Firefox and other missing packages are now available. If it still
fails, wait for a while until the newly added packages have been
propagated to all mirrors.

Akemi
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Re: [CentOS] Centos 6, KDE 4: canot manage network

[Michael D. Berger]

On Thu, 01 Sep 2011 16:03:35 -0400, m.roth-x6lchVBUigD1P9xLtpHBDw wrote:

> Michael D. Berger wrote:
>> On Thu, 01 Sep 2011 14:33:16 -0400, m.roth-x6lchVBUigD1P9xLtpHBDw
>> wrote: [...]
>>>
>>> ACK! Hedwig is about 10 years old. History: RH 1,2,3,4,5 (where I
>>> started using RH), 5.2,6 (Hedwig),7,7.1,7.2,7.3,8,9 (Shrike),
>>> RHEL1?2?,RHEL 3,RHEL 4, RHEL 5, and just this year, RHEL 6.
>>>
>>> Something's wrong with your GUI options. Why not do it from the
>>> command line?
>>
>> Is it just my GUI options, or is KDE 4 bad?  Is any one else succeeding
>> with CentOS 6 and KDE 4?
> 
> No idea - never used the GUI, literally. The most I've every used that
> was "GUI" (for small values of GUI), was system-config-network.
>>
>> I guess ifconfig and iwconfig are the commands to use. Right?
> 
> Is this on a laptop, or are you hardwired? If the latter, you can just
> edit /etc/sysconfig/network and
> /etc/sysconfig/network-scripts/ifcfg-eth0, then restart the network.
>>
>> Also, in view of all the problems I am having, perhaps I should drop
>> back to CentOS 5.6. What do you think?
> 
> Don't see why, unless you absolutely don't want to deal with the network
> other than through that GUI.
> 
> Btw, if you close that "your system is not supported", you can go to the
> rightmost tab and add a new profile. I'm *NOT* going to try that out on
> my system here at work, but I'll wager that you can then edit the other
> tabs.
> 
> mark

It is a laptop. I have not been able to get it to work
on the command line.  Perhaps it would help if I remove
NetworkManager? Also, there is probably not enough in my
ifcfg-wlan0.  I can see what is my ifcfg-eth0, but what do
I put if the network is unknown (I am traveling) or I am
using DHCP?  Do you have a reference I can read?

Thanks,
Mike.


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Re: [CentOS] CentOS 6 Partitioning Help

[Tom H]

On Thu, Sep 1, 2011 at 1:44 PM, John Hinton  wrote:
> On 9/1/2011 1:19 PM, Tom H wrote:
>> On Thu, Sep 1, 2011 at 1:20 AM, Simon Matter  wrote:
>>
>> from
>> http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Installation_Guide/s2-diskpartrecommend-x86.html
>> Do not place /usr on a separate partition If /usr is on a separate
>> partition from /, the boot process becomes much more complex, and in
>> some situations (like installations on iSCSI drives), might not work
>> at all.
>
> Thanks for this Tom. I was operating in old_schema mode and now I see I
> need to do a couple of re-installs as I did create /usr partitions. I do
> wonder why upstream left /usr as a suggestion in the partitioning
> program used inside of Anaconda?
>
> I do believe that 6.0 has more core changes than any release I remember
> to date.
>
> Good to find this out 'before' I got lots of stuff on that system!! ;) I
> can easily just copy my configs and start over way easier now than
> on a in service system!

You're welcome.

You must have forgotten the 4-5 transition and, for example, the
expanded-selinux-by-default change that it brought. :)

The 6-7 transition will be interesting simply judging from F15 and
F16: systemd and grub2. And most probably btrfs too.

I was pressed for time when I posted the two links. Poettering says in
his blog that you can have "/usr" on a separate partition if you mount
it in the initramfs. With dracut, it means using "--add fstab-sys" (or
adding "fstab-sys" to the "/etc/dracut.conf" modules list) and
creating an "/etc/fstab.sys" with a "/usr" line".
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Re: [CentOS] CentOS 6.0 and 3ware 9650SE series RAID Performance

[Austin Godber]

At this point the card is pretty much useless without that cache enabled.
 Without recommendations for making writes of 256MB or larger files faster
without this cache enabled, I will have to accept the possible data loss in
the event of power outage.  If it is only the case of data loss during a
power outage, I will take that ... rather than failure to write at all
during 99% of my usage.

I will, for the sake of not being an idiot, look into buying the BBUs.

Austin

On Thu, Sep 1, 2011 at 4:49 PM, Tom Bishop  wrote:

> Keep in mind you really only want to enable the cache if you have a
> bbc, otherwise you are risking your data since it can/will cache
> writes...just something to keep in mind.
>
> On 9/1/11, Austin Godber  wrote:
> > Hi Craig,
> >
> > Thanks for the suggestion.  I would if I could.  I'd also probably try
> > another file system.  Though the good news is, enabling the write cache
> on
> > that array has improved things significantly.  Which, in my case, was:
> >
> > tw_cli /c2/u0 set cache=on
> >
> > Now, if only I had the battery backup unit for the card.
> >
> > Thanks, everyone for their suggestions.  For now I am happy with the
> > situation, but I'd be interested to hear the experiences of others.
> >
> > Austin
> >
> > On Thu, Sep 1, 2011 at 3:58 PM, Craig White 
> wrote:
> >
> >>
> >> On Sep 1, 2011, at 1:41 PM, Austin Godber wrote:
> >>
> >> > Hello,
> >> >
> >> > Does anyone have experience using a 3ware 9650SE series raid
> controller
> >> on CentOS 6.0?
> >> 
> >> use RAID 10
> >>
> >> Unless something has changed, RAID 5 is notoriously slow on the 3Ware
> >> controllers. Whatever you do will only incrementally speed things up. If
> >> performance is desired, RAID 5 is not the way to go.
> >>
> >> Craig
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Re: [CentOS] CentOS 6.0 and 3ware 9650SE series RAID Performance

[Tom Bishop]

Keep in mind you really only want to enable the cache if you have a
bbc, otherwise you are risking your data since it can/will cache
writes...just something to keep in mind.

On 9/1/11, Austin Godber  wrote:
> Hi Craig,
>
> Thanks for the suggestion.  I would if I could.  I'd also probably try
> another file system.  Though the good news is, enabling the write cache on
> that array has improved things significantly.  Which, in my case, was:
>
> tw_cli /c2/u0 set cache=on
>
> Now, if only I had the battery backup unit for the card.
>
> Thanks, everyone for their suggestions.  For now I am happy with the
> situation, but I'd be interested to hear the experiences of others.
>
> Austin
>
> On Thu, Sep 1, 2011 at 3:58 PM, Craig White  wrote:
>
>>
>> On Sep 1, 2011, at 1:41 PM, Austin Godber wrote:
>>
>> > Hello,
>> >
>> > Does anyone have experience using a 3ware 9650SE series raid controller
>> on CentOS 6.0?
>> 
>> use RAID 10
>>
>> Unless something has changed, RAID 5 is notoriously slow on the 3Ware
>> controllers. Whatever you do will only incrementally speed things up. If
>> performance is desired, RAID 5 is not the way to go.
>>
>> Craig
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Re: [CentOS] CentOS 6.0 and 3ware 9650SE series RAID Performance

[Craig White]

I'm surprised that you can actually turn it on without a battery. I suspect 
that this is not a write-through/write-back cache but be forewarned that if 
there's no battery, it's possible that things you thought were written to the 
hard drive on shutdown/restart/hang/crash might not ever be written to the hard 
drive(s)

Craig

On Sep 1, 2011, at 4:17 PM, Austin Godber wrote:

> Hi Craig,
> 
> Thanks for the suggestion.  I would if I could.  I'd also probably try 
> another file system.  Though the good news is, enabling the write cache on 
> that array has improved things significantly.  Which, in my case, was:
> 
> tw_cli /c2/u0 set cache=on
> 
> Now, if only I had the battery backup unit for the card.
> 
> Thanks, everyone for their suggestions.  For now I am happy with the 
> situation, but I'd be interested to hear the experiences of others.
> 
> Austin
> 
> On Thu, Sep 1, 2011 at 3:58 PM, Craig White  wrote:
> 
> On Sep 1, 2011, at 1:41 PM, Austin Godber wrote:
> 
> > Hello,
> >
> > Does anyone have experience using a 3ware 9650SE series raid controller on 
> > CentOS 6.0?
> 
> use RAID 10
> 
> Unless something has changed, RAID 5 is notoriously slow on the 3Ware 
> controllers. Whatever you do will only incrementally speed things up. If 
> performance is desired, RAID 5 is not the way to go.

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[CentOS] xmlrpc-c-client from CR repo requires curl >= 7.15.5-9.el5_7.4

[Yves Bellefeuille]

The package xmlrpc-c-client-1.16.24-1206.1840.el5_7.4.i386 from the CR 
repository requires curl >= 7.15.5-9.el5_7.4, which isn't available.

The most recent version of curl I see is 7.15.5-9.el5_6.3, also in the 
CR repository.

Setting up Upgrade Process
Resolving Dependencies
--> Running transaction check
---> Package xmlrpc-c-client.i386 0:1.16.24-1206.1840.el5_7.4 set to be 
updated
--> Processing Dependency: xmlrpc-c = 1.16.24-1206.1840.el5_7.4 for 
package: xmlrpc-c-client
--> Processing Dependency: curl >= 7.15.5-9.el5_7.4 for package: 
xmlrpc-c-client
--> Running transaction check
---> Package xmlrpc-c.i386 0:1.16.24-1206.1840.el5_7.4 set to be updated
---> Package xmlrpc-c-client.i386 0:1.16.24-1206.1840.el5_7.4 set to be 
updated
--> Processing Dependency: curl >= 7.15.5-9.el5_7.4 for package: 
xmlrpc-c-client
--> Finished Dependency Resolution
xmlrpc-c-client-1.16.24-1206.1840.el5_7.4.i386 from cr has depsolving 
problems
  --> Missing Dependency: curl >= 7.15.5-9.el5_7.4 is needed by package 
xmlrpc-c-client-1.16.24-1206.1840.el5_7.4.i386 (cr)
Error: Missing Dependency: curl >= 7.15.5-9.el5_7.4 is needed by package 
xmlrpc-c-client-1.16.24-1206.1840.el5_7.4.i386 (cr)

-- 
Yves Bellefeuille 
"La Esperanta Civito ne rifuzas anticipe la kunlaboron de erarintoj, se
ili konscias pri sia eraro." -- Heroldo Komunikas, n-ro 473.
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Re: [CentOS] CentOS 6.0 and 3ware 9650SE series RAID Performance

[Austin Godber]

Hi Craig,

Thanks for the suggestion.  I would if I could.  I'd also probably try
another file system.  Though the good news is, enabling the write cache on
that array has improved things significantly.  Which, in my case, was:

tw_cli /c2/u0 set cache=on

Now, if only I had the battery backup unit for the card.

Thanks, everyone for their suggestions.  For now I am happy with the
situation, but I'd be interested to hear the experiences of others.

Austin

On Thu, Sep 1, 2011 at 3:58 PM, Craig White  wrote:

>
> On Sep 1, 2011, at 1:41 PM, Austin Godber wrote:
>
> > Hello,
> >
> > Does anyone have experience using a 3ware 9650SE series raid controller
> on CentOS 6.0?
> 
> use RAID 10
>
> Unless something has changed, RAID 5 is notoriously slow on the 3Ware
> controllers. Whatever you do will only incrementally speed things up. If
> performance is desired, RAID 5 is not the way to go.
>
> Craig
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Re: [CentOS] dealing with spoofing

[Bill Campbell]

On Thu, Sep 01, 2011, Always Learning wrote:
>
>On Thu, 2011-09-01 at 12:43 -0700, Scott Silva wrote:
>
>> I get TONS of spam with legitimate DKIM signatures...
>
>How is that possible ?

The spam comes from Yahoo! or perhaps Google groups?

Bill
-- 
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URL: http://www.celestial.com/  PO Box 820; 6641 E. Mercer Way
Voice:  (206) 236-1676  Mercer Island, WA 98040-0820
Fax:(206) 232-9186  Skype: jwccsllc (206) 855-5792

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35 million lines of quality code on which you can operate your business.
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Re: [CentOS] Scientific Linux 6.0 released (based on RHEL 6.0)

[Always Learning]

On Fri, 2011-03-04 at 18:03 +0530, Arun Khan wrote:

> Scientific Linux 6 is based on RHEL 6 with add-ons for scientific computing.
> 
> FWIW, the Admin tools etc. are pretty much the same as in RHEL, so are
> the base packages.

Just wondering how much of SL and C are interchangeable within the same
version.

Paul.


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Re: [CentOS] CentOS 6.0 and 3ware 9650SE series RAID Performance

[Craig White]

On Sep 1, 2011, at 1:41 PM, Austin Godber wrote:

> Hello,
> 
> Does anyone have experience using a 3ware 9650SE series raid controller on 
> CentOS 6.0?

use RAID 10

Unless something has changed, RAID 5 is notoriously slow on the 3Ware 
controllers. Whatever you do will only incrementally speed things up. If 
performance is desired, RAID 5 is not the way to go.

Craig
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Re: [CentOS] CentOS 6.0 and 3ware 9650SE series RAID Performance

[Austin Godber]

Hello Marcelo,

Thank you for the suggestion.  I had not yet tried activating the cache
since I was unsure whether that was a good idea or not.

Since you have experience with this card, do you have any recommendations
for what I should expect or avoid?  Have you used EXT3 with success or are
you using XFS or something else?

Austin

On Thu, Sep 1, 2011 at 2:05 PM, Marcelo Beckmann <
marcelo.beckm...@webers.com.br> wrote:

> Em 01-09-2011 17:41, Austin Godber escreveu:
> >
> > ===  tw_cli info c2  
> >
> > Unit  UnitType  Status %RCmpl  %V/I/M  Stripe  Size(GB)  Cache
> >  AVrfy
> >
> --
> > u0RAID-5OK -   -   64K 6519.19   OFF
> >  OFF
>
> I have the same controller on Centos 5.
>
> Did you try to active Cache on 3ware?
>
> [17:56:04 root@backup ~]# lspci | grep 3ware
> 01:00.0 RAID bus controller: 3ware Inc 9650SE SATA-II RAID PCIe (rev 01)
> [17:56:11 root@backup ~]# tw_cli /c4 show
>
> Unit  UnitType  Status %RCmpl  %V/I/M  Stripe  Size(GB)  Cache
> AVrfy
>
> --
> u0RAID-5OK -   -   64K 5587.9RiW
> ON
>
>
> In the past I had a scenario where I started with Cache OFF and had a
> poor performance, specially for write. After set Cache RiW I got better
> performance.
>
> I didn't test that controller on CentOS 6, but is good to know if there
> is some problem, because my company sells equipment with that controller.
>
>
> Best regards,
>
> --
> Marcelo Beckmann
> Suporte Corporativo - supo...@webers.com.br
> Webers Tecnologia - http://www.webers.com.br
> Curitiba   (PR) (41) 3094-6600
> Rio de Janeiro (RJ) (21) 4007-1207
> São Paulo  (SP) (11) 4007-1207
>
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Re: [CentOS] OT: help with email list reading programs w/ best features to read the centos and other lists that can filter people etc

[Les Mikesell]

On Thu, Sep 1, 2011 at 4:05 PM, Marko Vojinovic  wrote:
>
> One typical scenario is when I am interested in following one branch
> of a thread (i.e. a subthread), while I wish to ignore the rest. In
> KMail's threaded view this is trivial --- subthreads are just various
> branches in the thread tree, and I can always mark this branch as
> interesting, that as uninteresting, etc., and keep following only the
> interesting part of the thread.

I guess I've never believed that there would be no interesting posts
in a branch with an uninteresting parent or vice versa.  Is this a
real statistical observation or just a guess?


> I typically don't have time to read
> through all messages in a well-sized thread. In gmail this is
> literally impossible, and I need to go through *all* messages in the
> conversation, since the interesting branches and unimportant branches
> are mixed together.

Can't say that I really read everything but unless you are way behind
you mostly see the individual messages in the inbox anyway without
much structure in the unread portion, so you you can decide about most
of it based on subject/sender.

> Your usecase is probably different from mine. If you always have time
> to read through the whole thread, I agree that subthreading isn't
> important. But nevertheless, it's a pity that gmail's web interface
> doesn't support this, since there are people (like me) who would find
> proper threading very useful. In general I don't complain since KMail
> resolves this problem for me, but gmail devs would really gain some
> points in my eyes if they would implement real threading. ;-)

I'm starting to wonder how its fuzzy 'importance' concept works and if
it will turn out to be a more important metric than some old
upper-level parent post where the branch now has little in common with
the point where you decide to watch or ignore.   It is at least good
at flagging responses to my own messages, something that thunderbird
doesn't seem to understand.  Anyway, keeping the inbox empty is new to
me and using the web/phone readers is the first time I've been able to
do it.

-- 
  Les Mikesell
   lesmikes...@gmail.com
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Re: [CentOS] dealing with spoofing

[Scott Silva]

on 9/1/2011 1:14 PM Kenneth Porter spake the following:
> On Thursday, September 01, 2011 12:43 PM -0700 Scott Silva
>   wrote:
>
>> I get TONS of spam with legitimate DKIM signatures...
>
> DKIM and SPF do not stop you from getting spam. Their purpose is to keep
> you from getting joe-jobbed, by declaring to the world which mail really
> came from you. It protects email sources, not destinations.
>
> So you're getting "honest" spam that tells you that it really came from
> where it claims to have come from.
Yes... Hotmail and YAhoo let ANYONE sign up, and flood for a short time until 
they get cut off. Legitimate source, but still crap...


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Re: [CentOS] hfsplus.ko

[Akemi Yagi]

On Thu, Sep 1, 2011 at 2:05 PM, Jerry Geis  wrote:
>  I'm not all that excited about using another repo.
(snip)
> I extracted the source for 2.6.32.46 and found the fs/hfsplus directory.
> The above files are present. I changed the makefile to the above.
>
> All the files compile - however I dont know how to make the hfsplus.ko
> What step does that take?

You want to read through (and understand) this CentOS wiki article:

http://wiki.centos.org/HowTos/BuildingKernelModules

> Thanks, ( I know most people just use the repo - but I can't do that).

I don't know why you "can't do that", but anyway, good luck building
your own module.

Akemi
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Re: [CentOS] dealing with spoofing

[Always Learning]

On Thu, 2011-09-01 at 12:43 -0700, Scott Silva wrote:

> I get TONS of spam with legitimate DKIM signatures...

How is that possible ?

Paul.

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Re: [CentOS] CentOS 6.0 and 3ware 9650SE series RAID Performance

[Marcelo Beckmann]

Em 01-09-2011 17:41, Austin Godber escreveu:
>
> ===  tw_cli info c2  
> 
> Unit  UnitType  Status %RCmpl  %V/I/M  Stripe  Size(GB)  Cache
>  AVrfy
> --
> u0RAID-5OK -   -   64K 6519.19   OFF  
>  OFF

I have the same controller on Centos 5.

Did you try to active Cache on 3ware?

[17:56:04 root@backup ~]# lspci | grep 3ware
01:00.0 RAID bus controller: 3ware Inc 9650SE SATA-II RAID PCIe (rev 01)
[17:56:11 root@backup ~]# tw_cli /c4 show

Unit  UnitType  Status %RCmpl  %V/I/M  Stripe  Size(GB)  Cache
AVrfy
--
u0RAID-5OK -   -   64K 5587.9RiW
ON


In the past I had a scenario where I started with Cache OFF and had a
poor performance, specially for write. After set Cache RiW I got better
performance.

I didn't test that controller on CentOS 6, but is good to know if there
is some problem, because my company sells equipment with that controller.


Best regards,

-- 
Marcelo Beckmann
Suporte Corporativo - supo...@webers.com.br
Webers Tecnologia - http://www.webers.com.br
Curitiba   (PR) (41) 3094-6600
Rio de Janeiro (RJ) (21) 4007-1207
São Paulo  (SP) (11) 4007-1207

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Re: [CentOS] hfsplus.ko

[Jerry Geis]

  I'm not all that excited about using another repo.

I changed the makefile to:
obj-m += hfsplus.o

all:
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) bfind.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) bitmap.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) bnode.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) brec.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) btree.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) catalog.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) dir.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) extents.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) inode.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) ioctl.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) options.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) part_tbl.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) super.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) tables.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) unicode.o
 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) wrapper.o

I extracted the source for 2.6.32.46 and found the fs/hfsplus directory.
The above files are present. I changed the makefile to the above.

All the files compile - however I dont know how to make the hfsplus.ko
What step does that take?

Thanks, ( I know most people just use the repo - but I can't do that).

jerry
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Re: [CentOS] OT: help with email list reading programs w/ best features to read the centos and other lists that can filter people etc

[Marko Vojinovic]

On Thu, Sep 1, 2011 at 6:37 PM, Les Mikesell  wrote:
> On Thu, Sep 1, 2011 at 10:52 AM, Marko Vojinovic  wrote:
>> What I miss a lot in gmail's web interface is proper threading. That
>> "conversation" organization of e-mails is essentially the same thing,
>> only done worse. There is no way to distinguish sub-threads of a given
>> thread. Everything within one "conversation" is being displayed
>> linearly, instead of a natural tree-ordering. When a thread starts to
>> branch out into several directions at the same time, gmail's
>> "conversation" idea becomes worse than useless.
>
> True, but why do you care?  Every message stands on its own and
> normally carries any needed quoted context.

Oh, if only that were true all the time and with all posters... ;-)

>  I just read unread
> messages and respond or not.  The only place the history matters is if
> you want to see if the answer you are about to give (or need yourself)
> has already been posted.  But if you are caught up on the unread
> messages in the conversation (which all show at once) you'll already
> know that, and in any case the branches in the history don't matter in
> this regard.

One typical scenario is when I am interested in following one branch
of a thread (i.e. a subthread), while I wish to ignore the rest. In
KMail's threaded view this is trivial --- subthreads are just various
branches in the thread tree, and I can always mark this branch as
interesting, that as uninteresting, etc., and keep following only the
interesting part of the thread. I typically don't have time to read
through all messages in a well-sized thread. In gmail this is
literally impossible, and I need to go through *all* messages in the
conversation, since the interesting branches and unimportant branches
are mixed together. It is just annoying when I have to scroll through
the entire conversation, scanning every message for relevance. The SNR
can become high within a thread, and it is a pain when all messages
are displayed indiscriminantly.

I am using the gmail interface right now (unfortunately, I'm away from
my laptop since last week), and it is already getting on my nerves in
several threads on Fedora and CentOS lists.

Your usecase is probably different from mine. If you always have time
to read through the whole thread, I agree that subthreading isn't
important. But nevertheless, it's a pity that gmail's web interface
doesn't support this, since there are people (like me) who would find
proper threading very useful. In general I don't complain since KMail
resolves this problem for me, but gmail devs would really gain some
points in my eyes if they would implement real threading. ;-)

Best, :-)
Marko
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[CentOS] Managing permissions for web folders

[Ruslan Sivak]

We have a web folder /var/www/somesite that's a root for one of the sites.
 Apache serves files out of here.

It is an svn checkout, so that updates could be done by using svn up.

Everything has been going great when I use the root user to update, but now
I need to give access to other people to make deployments, and it doesn't
seem to be easy to do using regular users.

I have created a group called staff and added the new user to it, lets say
user1.

I ran the following commands to set the permissions

find . -type d -exec chmod 2775 \{} \;
find . -not -type d -exec chmod 0664 \{} \;
chown user1.staff .

This allows the user to make deployments.

Now comes in user2.  User2 is also a member of group staff, so he can also
make deployments.  We haven't ran into any issues yet, but I believe as long
as the files are owned by staff, both users can change the files, no matter
which one of them owns it.

Now we also need to give apache write access to a folder.  Lets say
/var/www/somesite/files.

There are several options here.
- We can add apache to the staff group, but this would give apache access to
the whole /var/www/somesite tree.
- We can change the group to apache.  We will need to add user1 and user2 to
the apache group.  One of the problems with this is that the users would
have access to everything that apache has access to.  Another problem is
that while user1 can run chmod -R user1.apache files, it will fail if the
files are owned by someone else (like user2 or apache).  Is there a way to
get around this?

Am I going about this the wrong way?

Russ
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Re: [CentOS] hfsplus.ko

[Lucian]

On Thu, Sep 1, 2011 at 9:27 PM, Jerry Geis  wrote:
>  Hey on Centos 5 hfsplus.ko is part of the Kernel:
>
> kernel-2.6.18-238.12.1.el5.x86_64 : The Linux kernel (the core of the
> Linux operating system)
> Repo        : installed
> Matched from:
> Filename    : /lib/modules/2.6.18-238.12.1.el5/kernel/fs/hfsplus/hfsplus.ko
>
> doing a yum provides "*/hfsplus.ko" on CentOS 6 finds nothing.
>
> What happened to hfsplus.ko on Centos 6?
>

See if elrepo.org provide it.
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[CentOS] CentOS 6.0 and 3ware 9650SE series RAID Performance

[Austin Godber]

Hello,

Does anyone have experience using a 3ware 9650SE series raid controller on
CentOS 6.0?

I am getting very sporadic throughput with moderately sized files (0.5-2GB)
on ext3.  I have tried most of the mount time tuning options:

* noatime
* trying different journal types
* setting commit=120 - helped a little

Even after these optimizations it doesn't seem like the raid array is
working as it should.  After a few 1GB writes (dd from /dev/zero to the
raid) kjournald runs for an hour and later writes are really slow.  Not only
that, using tw_cli is very slow ... whereas tw_cli is superfast if kjournald
is not churning away.

So it goes something like this

* write one 1GB file (486 MB/s)
* writes another (223 MB/s)
* any writes before the 120s commit kicks in, is ~200MB/s
* commit kicks in and kjournald starts churning
* writes are all over the map - 6-85MB/s

Maybe this is just the way it is, but it did not seem to be the case this
same hardware was running Fedora (Core) 9 and I have a similar machine where
this does not seem to be the case (I can't experiment on it at the moment).

The one thing I do not know, since I did not create the RAID or ext3
filesystem is whether the stride and stripe-width were properly selected to
match the 64k chunk size of the raid array.  I don't know how to tell from
tune2fs ... output below ... its either not there or by another name.

Any help or suggestions are appreciated.

Austin

Useful Information
==

== /proc/mounts =

/dev/sda1 /tonga_raid ext3
rw,noatime,errors=continue,nouser_xattr,noacl,commit=120,barrier=1,data=ordered
0 0


=  tw_cli /c2 show diag =

### Time Stamp:12:34:18 01-Sep-2011
### Host Name: tonga
### Host Architecture: x86_64 (64 bit)
### OS Version:Linux 2.6.32-71.29.1.el6.x86_64
### Model: 9650SE-8LPML
### Serial #:  L326025A8221043
### Controller ID: 2
### CLI Version:   2.00.11.016
### API Version:   2.08.00.017
### Driver Version:2.26.02.014RH
### Firmware Version:  FE9X 3.08.00.016
### BIOS Version:  BE9X 3.08.00.004
### Available Memory:  224MB

==
Diagnostic Information on Controller //.../c2/...
--
Event Trigger and Log Information:
Triggered Event(s) =
ctlreset (controller soft reset)
fwassert (firmware assert)
driveerr (drive error)
Diagnostic log save mode = -
Parameter table does not exist


== tune2fs -l /dev/sda1 =
tune2fs 1.41.12 (17-May-2010)
Filesystem volume name:   /data
Last mounted on:  
Filesystem UUID:  3c5f6dbb-d5dc-4f85-bc70-9b761c89c86e
Filesystem magic number:  0xEF53
Filesystem revision #:1 (dynamic)
Filesystem features:  has_journal ext_attr resize_inode dir_index
filetype needs_recovery sparse_super large_file
Filesystem flags: signed_directory_hash
Default mount options:user_xattr acl
Filesystem state: clean
Errors behavior:  Continue
Filesystem OS type:   Linux
Inode count:  427245568
Block count:  1708965879
Reserved block count: 85448293
Free blocks:  809305423
Free inodes:  426287552
First block:  0
Block size:   4096
Fragment size:4096
Reserved GDT blocks:  616
Blocks per group: 32768
Fragments per group:  32768
Inodes per group: 8192
Inode blocks per group:   512
Filesystem created:   Tue Sep  9 09:57:44 2008
Last mount time:  Thu Sep  1 12:40:01 2011
Last write time:  Thu Sep  1 12:40:01 2011
Mount count:  11
Maximum mount count:  -1
Last checked: Tue Aug 30 23:12:49 2011
Check interval:   0 ()
Reserved blocks uid:  0 (user root)
Reserved blocks gid:  0 (group root)
First inode:  11
Inode size:  256
Journal inode:8
Default directory hash:   tea
Directory Hash Seed:  0b324311-93a9-4c23-bf15-40965792029b
Journal backup:   inode blocks
===


===  tw_cli info c2  

Unit  UnitType  Status %RCmpl  %V/I/M  Stripe  Size(GB)  Cache
 AVrfy
--
u0RAID-5OK -   -   64K 6519.19   OFFOFF


Port   Status   Unit   SizeBlocksSerial
---
p0 OK   u0 931.51 GB   1953525168WD-WCASJ1631953

p1 OK   u0 931.51 GB   1953525168WD-WCASJ1622428

p2 OK   u0 931.51 GB   1953525168WD-WCASJ1639721

p3 OK   u0 931.51 GB   1953525168WD-WCASJ1636054

p4 OK 

Re: [CentOS] hfsplus.ko

[Ned Slider]

On 01/09/11 21:27, Jerry Geis wrote:
>Hey on Centos 5 hfsplus.ko is part of the Kernel:
>
> kernel-2.6.18-238.12.1.el5.x86_64 : The Linux kernel (the core of the
> Linux operating system)
> Repo: installed
> Matched from:
> Filename: /lib/modules/2.6.18-238.12.1.el5/kernel/fs/hfsplus/hfsplus.ko
>
> doing a yum provides "*/hfsplus.ko" on CentOS 6 finds nothing.
>
> What happened to hfsplus.ko on Centos 6?
>
> Thanks,
>
> Jerry

I don't know why Red Hat chose not to enable it in the kernel, but 
elrepo has it for you:

http://elrepo.org/linux/elrepo/el6/

Set up elrepo, and then do:

yum install kmod-hfsplus

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[CentOS] hfsplus.ko

[Jerry Geis]

  Hey on Centos 5 hfsplus.ko is part of the Kernel:

kernel-2.6.18-238.12.1.el5.x86_64 : The Linux kernel (the core of the 
Linux operating system)
Repo: installed
Matched from:
Filename: /lib/modules/2.6.18-238.12.1.el5/kernel/fs/hfsplus/hfsplus.ko

doing a yum provides "*/hfsplus.ko" on CentOS 6 finds nothing.

What happened to hfsplus.ko on Centos 6?

Thanks,

Jerry
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Re: [CentOS] dealing with spoofing

[Kenneth Porter]

On Thursday, September 01, 2011 12:43 PM -0700 Scott Silva 
 wrote:

> I get TONS of spam with legitimate DKIM signatures...

DKIM and SPF do not stop you from getting spam. Their purpose is to keep 
you from getting joe-jobbed, by declaring to the world which mail really 
came from you. It protects email sources, not destinations.

So you're getting "honest" spam that tells you that it really came from 
where it claims to have come from.


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[CentOS] Yum Update Errors

[Lee Perez]

Afternoon All,

Just ran yum update and it burped on the following:

Package xulrunner.i386 0:1.9.2.20-3.el5_7 set to be updated
--> Processing Conflict: firefox conflicts xulrunner >= 1.9.2.19

firefox-3.6.18-1.el5.centos.i386 from installed has depsolving problems
  --> firefox conflicts with xulrunner


Uname -a gives:
Linux  2.6.18-274.el5 #1 SMP Fri Jul 22 04:49:12 EDT 2011 i686 i686 i386 
GNU/Linux

I have never had any troubles updating my box before.  Anybody else seen 
this yet? Or what am I doing wrong.  Just woke up, please cut me some 
slack.

Thanks.
Lee Perez
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Re: [CentOS] Centos 6, KDE 4: canot manage network

[m . roth]

Michael D. Berger wrote:
> On Thu, 01 Sep 2011 14:33:16 -0400, m.roth-x6lchVBUigD1P9xLtpHBDw wrote:
> [...]
>>
>> ACK! Hedwig is about 10 years old. History: RH 1,2,3,4,5 (where I
>> started using RH), 5.2,6 (Hedwig),7,7.1,7.2,7.3,8,9 (Shrike),
>> RHEL1?2?,RHEL 3,RHEL 4, RHEL 5, and just this year, RHEL 6.
>>
>> Something's wrong with your GUI options. Why not do it from the command
>> line?
>
> Is it just my GUI options, or is KDE 4 bad?  Is any one else
> succeeding with CentOS 6 and KDE 4?

No idea - never used the GUI, literally. The most I've every used that was
"GUI" (for small values of GUI), was system-config-network.
>
> I guess ifconfig and iwconfig are the commands to use. Right?

Is this on a laptop, or are you hardwired? If the latter, you can just
edit /etc/sysconfig/network and /etc/sysconfig/network-scripts/ifcfg-eth0,
then restart the network.
>
> Also, in view of all the problems I am having, perhaps I should
> drop back to CentOS 5.6. What do you think?

Don't see why, unless you absolutely don't want to deal with the network
other than through that GUI.

Btw, if you close that "your system is not supported", you can go to the
rightmost tab and add a new profile. I'm *NOT* going to try that out on my
system here at work, but I'll wager that you can then edit the other tabs.

mark

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Re: [CentOS] dealing with spoofing

[Scott Silva]

on 9/1/2011 10:39 AM Kenneth Porter spake the following:
> --On Wednesday, August 31, 2011 5:48 PM -0400 Mailing Lists
>   wrote:
>
>> http://www.openspf.org/Introduction - SPF FTW
>
> DKIM is another possibility.
>
> Blizzard (the game company) signs some (not all) of its mail with DKIM, and
> I use that to spot obvious account-theft scams. Unfortunately some servers
> break the signature, so it can be difficult to use and verify.
>
> 
I get TONS of spam with legitimate DKIM signatures...




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Re: [CentOS] Centos 6, KDE 4: canot manage network

[Michael D. Berger]

On Thu, 01 Sep 2011 14:33:16 -0400, m.roth-x6lchVBUigD1P9xLtpHBDw wrote:
[...]
> 
> ACK! Hedwig is about 10 years old. History: RH 1,2,3,4,5 (where I
> started using RH), 5.2,6 (Hedwig),7,7.1,7.2,7.3,8,9 (Shrike),
> RHEL1?2?,RHEL 3,RHEL 4, RHEL 5, and just this year, RHEL 6.
> 
> Something's wrong with your GUI options. Why not do it from the command
> line?
> 
>  mark

Is it just my GUI options, or is KDE 4 bad?  Is any one else
succeeding with CentOS 6 and KDE 4?

I guess ifconfig and iwconfig are the commands to use. Right?

Also, in view of all the problems I am having, perhaps I should
drop back to CentOS 5.6. What do you think?

Mike.

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Re: [CentOS] Cannot start SSH at boot

[Dotan Cohen]

On Thu, Sep 1, 2011 at 17:57, Alain Péan
 wrote:
> I verified on CentOS 4 and 5, and SL6 servers, and they are all running
> on runlevel 5. I think it is the default runlevel for graphics interface
> (Gnome, KDE...).
>
> Alain
>

How silly of me! This server is in the guy's house, and obviously if
SSH is not running then he's logging in locally... I should have
suspected a graphical login. That's my lesson learned for today!
Thanks!


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Re: [CentOS] Cannot start SSH at boot

[Dotan Cohen]

On Thu, Sep 1, 2011 at 17:55, Mike Burger  wrote:
> Or, to simplify things and enable it for all applicable multi-user
> runlevels, just run:
>
> chkconfig sshd on
>

I usually don't like leaving daemons running when they don't need to
be. However, in this instance it would have helped!

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Re: [CentOS] Cannot start SSH at boot

[Dotan Cohen]

On Thu, Sep 1, 2011 at 17:35, John Doe  wrote:
> Maybe try:
>   chkconfig --del sshd
>   chkconfig --add sshd
>
> Do you see the symlinks?
>   # ll /etc/rc?.d/*sshd
>   lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc0.d/K25sshd -> ../init.d/sshd
>   lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc1.d/K25sshd -> ../init.d/sshd
>   lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc2.d/S55sshd -> ../init.d/sshd
>   lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc3.d/S55sshd -> ../init.d/sshd
>   lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc4.d/S55sshd -> ../init.d/sshd
>   lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc5.d/S55sshd -> ../init.d/sshd
>   lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc6.d/K25sshd -> ../init.d/sshd
>

Thanks. I didn't look to see if the symlinks were created, I should
have done that.


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Re: [CentOS] Centos 6, KDE 4: canot manage network

[m . roth]

Michael D. Berger wrote:
> On Thu, 01 Sep 2011 13:03:07 -0400, m.roth-x6lchVBUigD1P9xLtpHBDw wrote:
>> Michael D. Berger wrote:
>>> In KDE 4, I click:
>>>
>>> Kickoff > System Settings > Network & Connectivity >
>>>Network Settings > Network Settings
>>>
>>> I get a popup informing me that my system is not supported. (This did
>>> not happen before.) I am offered choices. I choose RedHat 6.0 (Is this
>>> wrong? I also tried RedHat 9.0.).
>>
>> Use RHEL 6. RH 9 was before RH started RHEL.
>>>
>>> I select Network Interfaces.  I see nothing on the list *** even though
>>> I am presently running eth0 and can successfully ping google.com
>>> through it.***.
>>
>> Are you running this as root, or did it ask for root's password? 
>>  mark
>
> I see "Red Hat Linux 6.0 Hedwig", I see no "RHEL" on the list.
> Is this missing?
>
> I am root.

ACK! Hedwig is about 10 years old. History: RH 1,2,3,4,5 (where I started
using RH), 5.2,6 (Hedwig),7,7.1,7.2,7.3,8,9 (Shrike), RHEL1?2?,RHEL 3,RHEL
4, RHEL 5, and just this year, RHEL 6.

Something's wrong with your GUI options. Why not do it from the command line?

 mark

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Re: [CentOS] CentOS 6 Partitioning Help

[John Hinton]

On 9/1/2011 1:19 PM, Tom H wrote:
> On Thu, Sep 1, 2011 at 1:20 AM, Simon Matter  wrote:
> from 
> http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Installation_Guide/s2-diskpartrecommend-x86.html
>  
> Do not place /usr on a separate partition If /usr is on a separate 
> partition from /, the boot process becomes much more complex, and in 
> some situations (like installations on iSCSI drives), might not work 
> at all.

Thanks for this Tom. I was operating in old_schema mode and now I see I 
need to do a couple of re-installs as I did create /usr partitions. I do 
wonder why upstream left /usr as a suggestion in the partitioning 
program used inside of Anaconda?

I do believe that 6.0 has more core changes than any release I remember 
to date.

Good to find this out 'before' I got lots of stuff on that system!! ;) I 
can easily just copy my configs and start over way easier now than 
on a in service system!

John Hinton

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Re: [CentOS] dealing with spoofing

[Kenneth Porter]

--On Wednesday, August 31, 2011 5:48 PM -0400 Mailing Lists 
 wrote:

> http://www.openspf.org/Introduction - SPF FTW

DKIM is another possibility.

Blizzard (the game company) signs some (not all) of its mail with DKIM, and 
I use that to spot obvious account-theft scams. Unfortunately some servers 
break the signature, so it can be difficult to use and verify.




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Re: [CentOS] CentOS 6 Partitioning Map/Schema

[Jonathan Vomacka]

John Doe,

Thanks, This is a good read and makes me feel better about splitting 
partitions.

On 9/1/2011 11:17 AM, John Doe wrote:
> From: Jonathan Vomacka
>
>> I have a question regarding CentOS 6 server partitioning.
>
> http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Installation_Guide/s2-diskpartrecommend-x86.html
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Re: [CentOS] Continuous releases and repository protection

[James A. Peltier]

- Original Message -
| James A. Peltier wrote:
| > Maybe I missed something, but it appears that the CR repository is
| > not compatible with yum priorities & possibly repository protection.
| > I had priority=1 set on [base] and [updates] and no updates
| > appeared. However, when I removed priority updates from cr became
| > visible. Is this expected? Did I miss this announcement on -devel or
| > such because I searched but couldn't find it.
| >
| >
| The updates need the same priority as the base you are trying to
| update
| otherwise they are ignored - thus for cr you need 1.
| HTH

That's what I expected but couldn't find an announcement about it so thought I 
would get it documented.

-- 
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IT Services - Research Computing Group
Simon Fraser University - Burnaby Campus
Phone   : 778-782-6573
Fax : 778-782-3045
E-Mail  : jpelt...@sfu.ca
Website : http://www.sfu.ca/itservices
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Re: [CentOS] CentOS 6 Partitioning Map/Schema

[Jonathan Vomacka]

Lamar,

Excellent email. Thank you so much you have been very informative!!!

On 9/1/2011 11:29 AM, Lamar Owen wrote:
> On Wednesday, August 31, 2011 09:21:25 PM Jonathan Vomacka wrote:
>> I was
>> recently told that this is an old style of partitioning and is not used
>> in modern day Linux distributions.
>
> The only thing old-style I saw in your list was the separate /usr partition.  
> I like having separate /var, /tmp, and /home.  /var because lots of data 
> resides there that can fill partitions quickly; logs, for instance.  I have 
> built machines where /var/log was separate, specifically for that reason.
>
>> So more accurately, here are my
>> questions to the list:
>>
>> 1) What is a good partition map/schema for a server OS where it's
>> primary purpose is for a LAMP server, DNS (bind), and possibly gameservers
>
> Splitting out filesystems into partitions makes sense primarily, in my 
> opinion and experience, in seven basic aspects:
> 1.) I/O load balancing across multiple spindles and/or controllers;
> 2.) Disk space isolation in case of filesystem 'overflow' (that is, you don't 
> want your mail spool in /var/spool/mail overflowing to be able to corrupt an 
> online database in, say, /var/lib/pgsql/data/base) (and while quotas can help 
> with this when two trees are not fully isolated, filesystems in different 
> partitons/logical volumes have hard overflow isolation);
> 3.) In the case of really large data stores with dynamic data, isolating the 
> impact of filesystem corruption;
> 4.) The ability to stagger fsck's between boots (the fsck time doesn't seem 
> to increase linearly with filesystem size);
> 5.) I/O 'tiering' (like EMC's FAST) where you can allocate your fastest 
> storage to the most rapidly changing data, and slower storage to data that 
> doesn't change frequently;
> 6.) Putting things into separate filesystem forces the admin to really have 
> to think through and design the system taking into account all the 
> requirements, instead of just throwing it all together and then wondering why 
> performance is suboptimal;
> 7.) Filesystems can be mounted with options specific to their use cases, and 
> using filesystem technology appropriate to the use case (noexec, for 
> instance, on filesystems that have no business having executables on them; 
> enabling/disabling journalling and other options as appropriate, and using 
> XFS, ext4, etc as appropriate, just to mentiona a few things).
>
>> 2) CentOS docs recommend using 10GB SWAP for 8GB of RAM. 1X the amount
>> of physical memory + 2GB added.
>
> If you put swap on LVM and give yourself room to grow you can increase swap 
> space size at will if you should find you need to do so.  Larger RAM (and 
> virtual RAM embodied by swap) does not always make things faster.  I have a 
> private e-mail from an admin of a large website showing severe MySQL 
> performance issues that were reduced by making the RAM size smaller (turned 
> out to be a caching mismanagement thing with poorly written queries that 
> caused it).
>
> Consider swap to be a safety buffer; the Linux kernel is by default 
> configured to overcommit memory, and swap exists to prevet the oom-killer 
> from reaping critical processes in this situation.  Tuning swap size and the 
> 'swappiness' of the kernel along with the overcommit policy should be done 
> together; the default settings produce the default recommendation of 'memory 
> size plus 2GB' that was for CentOS 5.  Not too long ago, the recommendation 
> was for swap to be twice the memory size.
>
> Multiple swap partitions can improve performance if those partitions are on 
> different spindles; however, this reduces reliability, too.  I don't have any 
> experience with benchmarking the performance of multiple 2GB swap spaces; I'd 
> find results of such benchmarks to be useful information.
>
>> 3) Is EXT4 better or worse to use then XFS for what I am planning to use
>> the system for?
>
> That depends; consult some file system comparisons (the wikipedia file system 
> comparison article is a good starting place).  I've used both; and I still 
> use both.  XFS as a filesystem is older and presumably more mature than ext4, 
> but age is not the only indicator of something that will work for you.  One 
> thing to remember is that XFS filesystems cannot currently be reduced in 
> size, only increased.  Ext4 can go either way if you realize you made too 
> large of a filesystem.
>
> XFS is very fast to create, but repairing requires absolutely the most RAM of 
> any recovery process I've ever seen.  XFS has seen a lot of use in the field, 
> particularly with large SGI boxes (Altix series, primarily) running Linux 
> (with the requisite 'lots of RAM' required for repair/recovery
>
> XFS currently is the only one where I have successfully made a large than 
> 16TB filesystem.  Don't try that on a 32-bit system (in fact, if you care 
> about data integrity, don't use XFS on a 32-bit system at all, unless

Re: [CentOS] Centos 6, KDE 4: canot manage network

[Michael D. Berger]

On Thu, 01 Sep 2011 13:03:07 -0400, m.roth-x6lchVBUigD1P9xLtpHBDw wrote:

> Michael D. Berger wrote:
>> In KDE 4, I click:
>>
>> Kickoff > System Settings > Network & Connectivity >
>>Network Settings > Network Settings
>>
>> I get a popup informing me that my system is not supported. (This did
>> not happen before.) I am offered choices. I choose RedHat 6.0 (Is this
>> wrong? I also tried RedHat 9.0.).
> 
> Use RHEL 6. RH 9 was before RH started RHEL.
>>
>> I select Network Interfaces.  I see nothing on the list *** even though
>> I am presently running eth0 and can successfully ping google.com
>> through it.***.
> 
> Are you running this as root, or did it ask for root's password? 
>  mark

I see "Red Hat Linux 6.0 Hedwig", I see no "RHEL" on the list.
Is this missing?

I am root.

Thanks,
Mike.

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Re: [CentOS] Continuous releases and repository protection

[Rob Kampen]

James A. Peltier wrote:

Maybe I missed something, but it appears that the CR repository is not compatible 
with yum priorities & possibly repository protection.  I had priority=1 set on 
[base] and [updates] and no updates appeared.  However, when I removed priority 
updates from cr became visible.  Is this expected?  Did I miss this announcement on 
-devel or such because I searched but couldn't find it.

  
The updates need the same priority as the base you are trying to update 
otherwise they are ignored - thus for cr you need 1.

HTH
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Re: [CentOS] CentOS 6 Partitioning Help

[Tom H]

On Thu, Sep 1, 2011 at 1:20 AM, Simon Matter  wrote:
>> On 08/31/2011 08:51 PM, Jonathan Vomacka wrote:
>>>
>>> In the past this was my partition scheme:
>>>
>>> Root filesystem (/) = 10240MB (10GB)
>>> /boot = 200MB
>>> swap =  1024MB (1GB)
>>> /var = 20480MB (20GB)
>>> /tmp = 10240MB (10GB)
>>> /usr = 51200MB (50GB)
>>> /home = all remaining space on the drive
>>
>> Having /usr separate from the root file system is no longer recommended
>> or supported.
>
> Are you sure that's true? Reading the latest EL6 docs I have the
> impression it's recommended to put /usr on the same disk where / and /boot
> are. That's a good rule but I don't think it's meant to run without /usr.

http://www.freedesktop.org/wiki/Software/systemd/separate-usr-is-broken

and

from
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Installation_Guide/s2-diskpartrecommend-x86.html

Do not place /usr on a separate partition

If /usr is on a separate partition from /, the boot process becomes
much more complex, and in some situations (like installations on iSCSI
drives), might not work at all.
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[CentOS] Continuous releases and repository protection

[James A. Peltier]

Maybe I missed something, but it appears that the CR repository is not 
compatible with yum priorities & possibly repository protection.  I had 
priority=1 set on [base] and [updates] and no updates appeared.  However, when 
I removed priority updates from cr became visible.  Is this expected?  Did I 
miss this announcement on -devel or such because I searched but couldn't find 
it.

-- 
James A. Peltier
IT Services - Research Computing Group
Simon Fraser University - Burnaby Campus
Phone   : 778-782-6573
Fax : 778-782-3045
E-Mail  : jpelt...@sfu.ca
Website : http://www.sfu.ca/itservices
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Re: [CentOS] Centos 6, KDE 4: canot manage network

[m . roth]

Michael D. Berger wrote:
> In KDE 4, I click:
>
> Kickoff > System Settings > Network & Connectivity >
>Network Settings > Network Settings
>
> I get a popup informing me that my system is not supported.
> (This did not happen before.) I am offered choices.
> I choose RedHat 6.0 (Is this wrong? I also tried
> RedHat 9.0.).

Use RHEL 6. RH 9 was before RH started RHEL.
>
> I select Network Interfaces.  I see nothing on the list
> *** even though I am presently running eth0 and can
> successfully ping google.com through it.***.

Are you running this as root, or did it ask for root's password?

 mark

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Re: [CentOS] OT: help with email list reading programs w/ best features to read the centos and other lists that can filter people etc

[Les Mikesell]

On Thu, Sep 1, 2011 at 10:52 AM, Marko Vojinovic  wrote:

>> Threads really only matter when responses are slow enough that you
>> forget the context - in which case you probably aren't all that
>> interested anyway.
>
> Or when you are involved in several conversations at the same time,
> and don't want to get confused. Or when you want your e-mail
> correspondences (and especially mailing lists) to be sorted in a neat
> way, like a filesystem tree. It can be very convenient, I am using
> threaded view in KMail all the time, for all my e-mail activity ---
> very easy to organize e-mails in an intuitive way. :-)

I've never been able to sort things in a way that makes any sense -
and I don't expect conversations to have any natural order. I just
want a very good search mechanism to find anything based on any
snippet I happen to remember or need at the time.

>>  With thunderbird I normally don't use a threaded
>> view but sometimes flip to it (which is sort of awkward except on a
>> Mac where you can use OS facilities to map a key to a multi-step
>> operation).  But in gmail I do like their normal 'conversation'
>> presentation where the previously read messages are mostly hidden but
>> accessible with a click and the unread messages are all opened
>> together with large blocks of quoted text mostly hidden.  I'm used to
>> reading 'backwards' in time order so I know what has already been
>> answered, but the gmail view is a little nicer to see the new portion
>> in order and in context.
>
> What I miss a lot in gmail's web interface is proper threading. That
> "conversation" organization of e-mails is essentially the same thing,
> only done worse. There is no way to distinguish sub-threads of a given
> thread. Everything within one "conversation" is being displayed
> linearly, instead of a natural tree-ordering. When a thread starts to
> branch out into several directions at the same time, gmail's
> "conversation" idea becomes worse than useless.

True, but why do you care?  Every message stands on its own and
normally carries any needed quoted context.  I just read unread
messages and respond or not.  The only place the history matters is if
you want to see if the answer you are about to give (or need yourself)
has already been posted.  But if you are caught up on the unread
messages in the conversation (which all show at once) you'll already
know that, and in any case the branches in the history don't matter in
this regard.

> I use a gmail account on a regular basis, but try to avoid their web
> interface whenever I can. KMail is so much better (for me at least)...

I used to only log in when I wanted to search messages that I had
deleted locally, but It has gotten a lot better, with many more
options that you can activate in the settings.  The one that matters
the most to me is to auto-advance to the next unread conversation as
you archive/delete the current one instead of re-displaying the inbox.
 It is still slightly clunky in how you have to do multi-selects and
move things compared to native applications, but not bad overall and
meshes conceptually with the way the gmail phone app works so it is
easy to stay current when reading on the phone but put off replying
until you have a better keyboard.  And of course the web interface
means you don't have to configure a bunch of stuff to get imap readers
synchronized across all of your computers (which I did anyway with
thunderbird - I just don't use it as often now).

-- 
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[CentOS] Centos 6, KDE 4: canot manage network

[Michael D. Berger]

In KDE 4, I click:

Kickoff > System Settings > Network & Connectivity >
   Network Settings > Network Settings

I get a popup informing me that my system is not supported.
(This did not happen before.) I am offered choices. 
I choose RedHat 6.0 (Is this wrong? I also tried
RedHat 9.0.).

I select Network Interfaces.  I see nothing on the list
*** even though I am presently running eth0 and can
successfully ping google.com through it.***.

Now I set that interface using a GUI just a few days ago.
I will say, the GUI looks different.

So what's happening?

Thanks for your help.
Mike.

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[CentOS] PANIC: early exception 0e rip 10:0 error 10 cr2 0

[Rudi Ahlers]

Hi all,

I installed XEN on a CentOS 6 server, as per these instructions:
http://www.crc.id.au/xen-on-rhel6-scientific-linux-6-centos-6-howto/


And the server now gives this error on reboot: PANIC: early exception
0e rip 10:0 error 10 cr2 0
These are the packages that were installed before the reboot:



Total download size: 33 M
Installed size: 116 M
Is this ok [y/N]: y
Downloading Packages:
(1/14): PyXML-0.8.4-19.el6.x86_64.rpm
   | 892 kB 00:00
(2/14): SDL-1.2.14-2.el6.x86_64.rpm
   | 193 kB 00:00
(3/14): kernel-xen-2.6.32.45-1.x86_64.rpm
   |  20 MB 00:12
(4/14): kpartx-0.4.9-31.el6_0.3.x86_64.rpm
   |  37 kB 00:00
(5/14): libXdamage-1.1.2-1.el6.x86_64.rpm
   |  16 kB 00:00
(6/14): libXfixes-4.0.4-1.el6.x86_64.rpm
   |  19 kB 00:00
(7/14): libXxf86vm-1.1.0-1.el6.x86_64.rpm
   |  18 kB 00:00
(8/14): mesa-dri-drivers-7.7-2.el6.x86_64.rpm
   | 1.5 MB 00:00
(9/14): mesa-libGL-7.7-2.el6.x86_64.rpm
   | 144 kB 00:00
(10/14): xen-4.1.1-3.1.x86_64.rpm
   | 1.0 MB 00:00
(11/14): xen-hypervisor-4.1.1-3.1.x86_64.rpm
   | 3.8 MB 00:01
(12/14): xen-libs-4.1.1-3.1.x86_64.rpm
   | 309 kB 00:00
(13/14): xen-licenses-4.1.1-3.1.x86_64.rpm
   |  63 kB 00:00
(14/14): xen-runtime-4.1.1-3.1.x86_64.rpm
   | 4.9 MB 00:02
-
Total
  1.7 MB/s |  33 MB 00:20
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : libXfixes-4.0.4-1.el6.x86_64
 1/14
  Installing : libXdamage-1.1.2-1.el6.x86_64
 2/14
  Installing : SDL-1.2.14-2.el6.x86_64
 3/14
  Installing : kpartx-0.4.9-31.el6_0.3.x86_64
 4/14
  Installing : mesa-dri-drivers-7.7-2.el6.x86_64
 5/14
  Installing : PyXML-0.8.4-19.el6.x86_64
 6/14
  Installing : libXxf86vm-1.1.0-1.el6.x86_64
 7/14
  Installing : xen-licenses-4.1.1-3.1.x86_64
 8/14
  Installing : xen-libs-4.1.1-3.1.x86_64
 9/14
  Installing : mesa-libGL-7.7-2.el6.x86_64
10/14
  Installing : xen-hypervisor-4.1.1-3.1.x86_64
11/14
  Installing : xen-runtime-4.1.1-3.1.x86_64
12/14
  Installing : xen-4.1.1-3.1.x86_64
13/14
  Installing : kernel-xen-2.6.32.45-1.x86_64
14/14
Added 'installonlypkgs' line to /etc/yum.conf!

Installed:
  kernel-xen.x86_64 0:2.6.32.45-1
xen.x86_64 0:4.1.1-3.1

Dependency Installed:
  PyXML.x86_64 0:0.8.4-19.el6   SDL.x86_64 0:1.2.14-2.el6
   kpartx.x86_64 0:0.4.9-31.el6_0.3
  libXdamage.x86_64 0:1.1.2-1.el6   libXfixes.x86_64
0:4.0.4-1.el6libXxf86vm.x86_64 0:1.1.0-1.el6
  mesa-dri-drivers.x86_64 0:7.7-2.el6   mesa-libGL.x86_64
0:7.7-2.el6 xen-hypervisor.x86_64 0:4.1.1-3.1
  xen-libs.x86_64 0:4.1.1-3.1   xen-licenses.x86_64
0:4.1.1-3.1   xen-runtime.x86_64 0:4.1.1-3.1




Has anyone seen this?

the server is in a DC in America so I need todo everything over the
internet from South Africa and the KVM is a bit slow.





-- 
Kind Regards
Rudi Ahlers
SoftDux

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Re: [CentOS] OT: help with email list reading programs w/ best features to read the centos and other lists that can filter people etc

[Marko Vojinovic]

On Wed, Aug 31, 2011 at 6:23 PM, Les Mikesell  wrote:
> On Wed, Aug 31, 2011 at 10:48 AM, R - elists  wrote:
>> i am suprised that more folks havent spoken up about favorite "threaded
>> email readers" or has everyone just gone to Thunderbird or other similar?

AFAIK, every recent mail client has threading support. They should all
basically be feature-complete, as long as you are not asking for
something *very* awkward. ;-)

> Threads really only matter when responses are slow enough that you
> forget the context - in which case you probably aren't all that
> interested anyway.

Or when you are involved in several conversations at the same time,
and don't want to get confused. Or when you want your e-mail
correspondences (and especially mailing lists) to be sorted in a neat
way, like a filesystem tree. It can be very convenient, I am using
threaded view in KMail all the time, for all my e-mail activity ---
very easy to organize e-mails in an intuitive way. :-)

>  With thunderbird I normally don't use a threaded
> view but sometimes flip to it (which is sort of awkward except on a
> Mac where you can use OS facilities to map a key to a multi-step
> operation).  But in gmail I do like their normal 'conversation'
> presentation where the previously read messages are mostly hidden but
> accessible with a click and the unread messages are all opened
> together with large blocks of quoted text mostly hidden.  I'm used to
> reading 'backwards' in time order so I know what has already been
> answered, but the gmail view is a little nicer to see the new portion
> in order and in context.

What I miss a lot in gmail's web interface is proper threading. That
"conversation" organization of e-mails is essentially the same thing,
only done worse. There is no way to distinguish sub-threads of a given
thread. Everything within one "conversation" is being displayed
linearly, instead of a natural tree-ordering. When a thread starts to
branch out into several directions at the same time, gmail's
"conversation" idea becomes worse than useless.

I use a gmail account on a regular basis, but try to avoid their web
interface whenever I can. KMail is so much better (for me at least)...
;-)

HTH, :-)
Marko
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Re: [CentOS] Unable to run yum update

[david]

Robert:

Good eyes, but the error is in MY description.  The machine is a 
64-bit machine.  I was misled by some other issues I had with a 
near-by 32-bit machine.

So, I'm back to trying to figure this out, and trying to understand 
why it happened on one of my 64-bit systems and not others, where 
I've configured them pretty much the same.

David


At 07:56 AM 9/1/2011, you wrote:
>On Wednesday 31 August 2011 17:37, the following was written:
>
> >  The system involved is a 64-bit system, installed via the net about a
> >
> > yum update
> >
> >  encountered the following diagonstic
> >
> >  Error: Package: yaf-1.3.2-1.el6.rf.x86_64 (@rpmforge)
> >  Requires: libfixbuf-0.9.0.so.8()(64bit)
> >  Removing: libfixbuf-0.9.0-1.el6.rf.x86_64 (@rpmforge)
> >  libfixbuf-0.9.0.so.8()(64bit)
> >  Updated By: libfixbuf-1.0.1-1.el6.rf.x86_64 (rpmforge)
> >  Not found

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Re: [CentOS] CentOS 6 Partitioning Map/Schema

[Lamar Owen]

On Wednesday, August 31, 2011 09:21:25 PM Jonathan Vomacka wrote:
> I was 
> recently told that this is an old style of partitioning and is not used 
> in modern day Linux distributions. 

The only thing old-style I saw in your list was the separate /usr partition.  I 
like having separate /var, /tmp, and /home.  /var because lots of data resides 
there that can fill partitions quickly; logs, for instance.  I have built 
machines where /var/log was separate, specifically for that reason.  

> So more accurately, here are my 
> questions to the list:
> 
> 1) What is a good partition map/schema for a server OS where it's 
> primary purpose is for a LAMP server, DNS (bind), and possibly gameservers

Splitting out filesystems into partitions makes sense primarily, in my opinion 
and experience, in seven basic aspects:
1.) I/O load balancing across multiple spindles and/or controllers;
2.) Disk space isolation in case of filesystem 'overflow' (that is, you don't 
want your mail spool in /var/spool/mail overflowing to be able to corrupt an 
online database in, say, /var/lib/pgsql/data/base) (and while quotas can help 
with this when two trees are not fully isolated, filesystems in different 
partitons/logical volumes have hard overflow isolation);
3.) In the case of really large data stores with dynamic data, isolating the 
impact of filesystem corruption;
4.) The ability to stagger fsck's between boots (the fsck time doesn't seem to 
increase linearly with filesystem size);
5.) I/O 'tiering' (like EMC's FAST) where you can allocate your fastest storage 
to the most rapidly changing data, and slower storage to data that doesn't 
change frequently;
6.) Putting things into separate filesystem forces the admin to really have to 
think through and design the system taking into account all the requirements, 
instead of just throwing it all together and then wondering why performance is 
suboptimal;
7.) Filesystems can be mounted with options specific to their use cases, and 
using filesystem technology appropriate to the use case (noexec, for instance, 
on filesystems that have no business having executables on them; 
enabling/disabling journalling and other options as appropriate, and using XFS, 
ext4, etc as appropriate, just to mentiona a few things).

> 2) CentOS docs recommend using 10GB SWAP for 8GB of RAM. 1X the amount 
> of physical memory + 2GB added.

If you put swap on LVM and give yourself room to grow you can increase swap 
space size at will if you should find you need to do so.  Larger RAM (and 
virtual RAM embodied by swap) does not always make things faster.  I have a 
private e-mail from an admin of a large website showing severe MySQL 
performance issues that were reduced by making the RAM size smaller (turned out 
to be a caching mismanagement thing with poorly written queries that caused it).

Consider swap to be a safety buffer; the Linux kernel is by default configured 
to overcommit memory, and swap exists to prevet the oom-killer from reaping 
critical processes in this situation.  Tuning swap size and the 'swappiness' of 
the kernel along with the overcommit policy should be done together; the 
default settings produce the default recommendation of 'memory size plus 2GB' 
that was for CentOS 5.  Not too long ago, the recommendation was for swap to be 
twice the memory size.

Multiple swap partitions can improve performance if those partitions are on 
different spindles; however, this reduces reliability, too.  I don't have any 
experience with benchmarking the performance of multiple 2GB swap spaces; I'd 
find results of such benchmarks to be useful information.

> 3) Is EXT4 better or worse to use then XFS for what I am planning to use 
> the system for?

That depends; consult some file system comparisons (the wikipedia file system 
comparison article is a good starting place).  I've used both; and I still use 
both.  XFS as a filesystem is older and presumably more mature than ext4, but 
age is not the only indicator of something that will work for you.  One thing 
to remember is that XFS filesystems cannot currently be reduced in size, only 
increased.  Ext4 can go either way if you realize you made too large of a 
filesystem.

XFS is very fast to create, but repairing requires absolutely the most RAM of 
any recovery process I've ever seen.  XFS has seen a lot of use in the field, 
particularly with large SGI boxes (Altix series, primarily) running Linux (with 
the requisite 'lots of RAM' required for repair/recovery

XFS currently is the only one where I have successfully made a large than 16TB 
filesystem.  Don't try that on a 32-bit system (in fact, if you care about data 
integrity, don't use XFS on a 32-bit system at all, unless you have rebuilt the 
kernel with 8k stacks).  The mkfs.xfs on a greater than 16TB partition/logical 
volume will execute successfully on a 32-bit system (the last time I tried it), 
but as soon as you go over 16TB with your data you will no longer be a

Re: [CentOS] CentOS 6 Partitioning Help

[Robert Nichols]

On 09/01/2011 12:20 AM, Simon Matter wrote:
>> On 08/31/2011 08:51 PM, Jonathan Vomacka wrote:
>>> In the past this was my partition scheme:
>>>
>>> Root filesystem (/) = 10240MB (10GB)
>>> /boot = 200MB
>>> swap =  1024MB (1GB)
>>> /var = 20480MB (20GB)
>>> /tmp = 10240MB (10GB)
>>> /usr = 51200MB (50GB)
>>> /home = all remaining space on the drive
>>
>> Having /usr separate from the root file system is no longer recommended
>> or supported.  There are various bits and pieces from /usr that now may
>
> Are you sure that's true? Reading the latest EL6 docs I have the
> impression it's recommended to put /usr on the same disk where / and /boot
> are. That's a good rule but I don't think it's meant to run without /usr.

Yes, I'm quite sure.  Do you have a specific reference that supports your
impression?

Here's what the RHEL6 Installation Guide has to say:

  Do not place /usr on a separate partition If /usr is on a separate
  partition from /, the boot process becomes much more complex, and
  in some situations (like installations on iSCSI drives), might not
  work at all.

I had a discussion about this on the Fedora users list back in March. Since
Fedora 11, separate /usr partition has not been recommended.  For Fedora 12
(the basis for RHEL6), I went through the exercise of identifying the files
on /usr that might be needed early in the boot sequence.  Here is what I
found:

 /usr/sbin/vbetool
 /usr/sbin/pcscd
 /usr/sbin/Kobil_mIDentity_switch
 /usr/sbin/bluetoothd
 /usr/bin/env
 /usr/bin/hp-mkuri
 /usr/share/hwdata/* (total of 29 files)
 /usr/lib64/libusb-0.1.so.4.4.4
 /usr/lib64/libsensors.so.4.2.1
 /usr/lib64/libbluetooth.so.3.4.2
 /usr/lib64/libcrypto.so.10
 /usr/lib64/libpciaccess.so.0
 /usr/lib64/libnetsnmp.so.15.1.2
 /usr/lib64/libpciaccess.so.0.10.8
 /usr/lib64/libnetsnmp.so.15
 /usr/lib64/libsensors.so.4
 /usr/lib64/pcsc/drivers/ifd-ccid.bundle/Contents/Linux/libccid.so.1.3.9
 /usr/lib64/pcsc/drivers/ifd-ccid.bundle/Contents/Linux/libccid.so
 /usr/lib64/pcsc/drivers/ifd-ccid.bundle/Contents/Info.plist
 /usr/lib64/pcsc/drivers/serial/libccidtwin.so
 /usr/lib64/pcsc/drivers/serial/libccidtwin.so.1.3.9
 /usr/lib64/libusb-0.1.so.4
 /usr/lib64/libcrypto.so.1.0.0b
 /usr/lib64/libx86.so.1
 /usr/lib64/libhal.so.1.0.0
 /usr/lib64/libhal.so.1
 /usr/lib64/libbluetooth.so.3
 /usr/lib64/libusb-1.0.so.0.0.0
 /usr/lib64/libusb-1.0.so.0

I actually had a Fedora 12 system set up with a root file system that
had a stub /usr directory tree containing just those files.  It would
get overlaid by the full /usr file system when that partition got
mounted.  I wouldn't actually recommend that as a configuration.

-- 
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 Do NOT delete it.

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Re: [CentOS] CentOS 6 Partitioning Map/Schema

[John Doe]

From: Jonathan Vomacka 

> I have a question regarding CentOS 6 server partitioning.

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Installation_Guide/s2-diskpartrecommend-x86.html
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Re: [CentOS] Cannot start SSH at boot

[Alain Péan]

Le 01/09/2011 16:24, Dotan Cohen a écrit :
> Turns out that this install boots to runlevel 5. I didn't install it, 
> so I don't know why. But now that I've identified that, giving the 
> proper command [1] fixed the issue. Thanks. [1] chkconfig --level 5 
> sshd on 

I verified on CentOS 4 and 5, and SL6 servers, and they are all running 
on runlevel 5. I think it is the default runlevel for graphics interface 
(Gnome, KDE...).

Alain

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Re: [CentOS] Unable to run yum update

[Robert Spangler]

On Wednesday 31 August 2011 17:37, the following was written:

>  The system involved is a 32-bit system, installed via the net about a
>
> yum update
>
>  encountered the following diagonstic
>
>  Error: Package: yaf-1.3.2-1.el6.rf.x86_64 (@rpmforge)
>  Requires: libfixbuf-0.9.0.so.8()(64bit)
>  Removing: libfixbuf-0.9.0-1.el6.rf.x86_64 (@rpmforge)
>  libfixbuf-0.9.0.so.8()(64bit)
>  Updated By: libfixbuf-1.0.1-1.el6.rf.x86_64 (rpmforge)
>  Not found


These are 64 bit programs.  Look at them closely.

'x86_64'
'(64bit)'

Are your clues.


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Re: [CentOS] Cannot start SSH at boot

[Mike Burger]

> On Thu, Sep 1, 2011 at 17:21, Stefan Held  wrote:
>> Maybe a specific ip in /etc/ssh/sshd_config ? And the Network is not up?
>>
>> Have a look at /var/log/messages. Any hint there?
>>
>
> Turns out that this install boots to runlevel 5. I didn't install it,
> so I don't know why. But now that I've identified that, giving the
> proper command [1] fixed the issue. Thanks.
>
> [1] chkconfig --level 5 sshd on
>

Or, to simplify things and enable it for all applicable multi-user
runlevels, just run:

chkconfig sshd on


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Re: [CentOS] Cannot start SSH at boot

[John Doe]

From: Dotan Cohen 

> On a particular CentOS 6 install, I must start SSH manually:
> # /etc/init.d/sshd start
> I have tried to configure it to start automatically:
> # chkconfig --level 3 sshd on

Maybe try:
  chkconfig --del sshd
  chkconfig --add sshd

Do you see the symlinks?
  # ll /etc/rc?.d/*sshd
  lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc0.d/K25sshd -> ../init.d/sshd
  lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc1.d/K25sshd -> ../init.d/sshd
  lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc2.d/S55sshd -> ../init.d/sshd
  lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc3.d/S55sshd -> ../init.d/sshd
  lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc4.d/S55sshd -> ../init.d/sshd
  lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc5.d/S55sshd -> ../init.d/sshd
  lrwxrwxrwx. 1 root root 14 Sep  1 15:06 /etc/rc6.d/K25sshd -> ../init.d/sshd

JD
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[CentOS] xvfb question

[bcb]

First, I realize this might not be the right group.  Please feel free to 
redirect me :-)

I recently upgraded from CentOS 5.6 to 6.0.  Since the upgrade, Xvfb will, 
on occasion, "just stop" (ie the process disappears from the system, as 
opposed to still being there but not working).  I can't find any tracks 
anywhere that it might have left behind that might be clues as to why it 
stopped.  There's nothing in /var/log that looks promising (nothing in 
messages or Xorg.0.log).  

Any other clues about where to look or command line options I should add?  

Thanks in advance,

Bruce

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Re: [CentOS] CentOS 6 Partitioning Help

[m . roth]

Always Learning wrote:
> On Thu, 2011-09-01 at 09:54 -0400, m.r...@5-cent.us wrote:
>
>> I missed the thread overnight (for me), but the way I used to recommend
>> it is part of my article, which you can read at
>>  These days, our default here
>> at work is:
>> /boot is 200M (we'll probably be moving that up to 300M or 500M, given
>> the
>> preupgrade of fedora that will probably be coming down the pike).
>> 2GB is swap
>> and the rest of the drive is / (my manager doesn't like LVM, for some
>> reason). home directories are *always* NFS mounted here; at home, it's
>> *always* on a separate partition or drive, along with /opt, though I
>> might start putting /usr/local there as well, given that some things
>> seem to be moving back there from /opt.
>
> Agreed /boot needs less (currently on C 5) than 200 MB.

That's where I disagree, actually: in the future, I'll be putting either
300M or 500M on /boot, having used preupgrade to bring one system from
fedora 9? 10? to 13, and I had to delete and delete from /boot to squeeze
it in - it seems to want to install most of the base o/s, and is
*bloated*, that it wants a *lot* of space... and I'm sure we'll see that
reflected in CentOS in CentOS 7 or so.

mark

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Re: [CentOS] Cannot start SSH at boot

[Dotan Cohen]

On Thu, Sep 1, 2011 at 17:21, Stefan Held  wrote:
> Maybe a specific ip in /etc/ssh/sshd_config ? And the Network is not up?
>
> Have a look at /var/log/messages. Any hint there?
>

Turns out that this install boots to runlevel 5. I didn't install it,
so I don't know why. But now that I've identified that, giving the
proper command [1] fixed the issue. Thanks.

[1] chkconfig --level 5 sshd on

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Re: [CentOS] Cannot start SSH at boot

[Stefan Held]

Am Donnerstag, den 01.09.2011, 17:09 +0300 schrieb Dotan Cohen:

> However, it still must be manually started. I am not getting any
> errors. What might be preventing it from starting?
> 

Maybe a specific ip in /etc/ssh/sshd_config ? And the Network is not up?

Have a look at /var/log/messages. Any hint there?

-- 

Stefan Held  VI has only 2 Modes:
obi unixkiste orgThe first one is for beeping all the time,
FreeNode: foo_barthe second destroys the text.
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[CentOS] Cannot start SSH at boot

[Dotan Cohen]

On a particular CentOS 6 install, I must start SSH manually:
# /etc/init.d/sshd start

I have tried to configure it to start automatically:
# chkconfig --level 3 sshd on

However, it still must be manually started. I am not getting any
errors. What might be preventing it from starting?

Thanks.

-- 
Dotan Cohen

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Re: [CentOS] CentOS 6, KDE 4: bad DNS traffic

[Michael D. Berger]

On Wed, 31 Aug 2011 18:22:42 +, Michael D. Berger wrote:

> On my new CentOS 6, KDE 4, running WireShark I see what appears to be
> frequent nonsensical DNS queries, for example:
>"settings-personal.desktop" and "settings-system.desktop".
> The DNS response is always:"No such name".  Do tell! These appear
> especially when I click on things on the KDE menus.  On my old CentOS 5
> box, on the same LAN, I see no such thing.  I note that I have replaced
> the original /etc/hosts with my own.  Might these have been resolved in
> the original?
> 
> Thanks for your comments.
> Mike.

Please see: gmane.comp.kde.general, thread: "Bad DNS Query for
Date & Time" for additional information on this matter.  The
problem has not, as yet, been solved.

Mike.

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Re: [CentOS] CentOS 6 Partitioning Help

[Always Learning]

On Thu, 2011-09-01 at 09:54 -0400, m.r...@5-cent.us wrote:

> I missed the thread overnight (for me), but the way I used to recommend it
> is part of my article, which you can read at
>  These days, our default here at
> work is:
> /boot is 200M (we'll probably be moving that up to 300M or 500M, given the
> preupgrade of fedora that will probably be coming down the pike).
> 2GB is swap
> and the rest of the drive is / (my manager doesn't like LVM, for some
> reason). home directories are *always* NFS mounted here; at home, it's
> *always* on a separate partition or drive, along with /opt, though I might
> start putting /usr/local there as well, given that some things seem to be
> moving back there from /opt.

Agreed /boot needs less (currently on C 5) than 200 MB.
Operating system in one partition on /
User data on a different partition or partitions.

> Sizing: remember, do NOT size for "typical", size for worst huge case,
> esp. for a production or development system that others will be using.

Agreed. 

Paul.

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Re: [CentOS] CentOS 6 Partitioning Help

[m . roth]

Always Learning wrote:
> On Thu, 2011-09-01 at 15:19 +0200, Rudi Ahlers wrote:
>
>> just goes to show how well people actually read anything on the
>> internet these days. and then they can't understand why the original
>> poster gets irritated when he's told to use a hammer to hit the nail
>> into the wall, when asked what color your car is.

But who's filling the bathtub with power tools?

I missed the thread overnight (for me), but the way I used to recommend it
is part of my article, which you can read at
 These days, our default here at
work is:
/boot is 200M (we'll probably be moving that up to 300M or 500M, given the
preupgrade of fedora that will probably be coming down the pike).
2GB is swap
and the rest of the drive is / (my manager doesn't like LVM, for some
reason). home directories are *always* NFS mounted here; at home, it's
*always* on a separate partition or drive, along with /opt, though I might
start putting /usr/local there as well, given that some things seem to be
moving back there from /opt.

Sizing: remember, do NOT size for "typical", size for worst huge case,
esp. for a production or development system that others will be using.

 mark



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Re: [CentOS] CentOS 6 Partitioning Help

[Always Learning]

On Thu, 2011-09-01 at 15:19 +0200, Rudi Ahlers wrote:

> just goes to show how well people actually read anything on the
> internet these days. and then they can't understand why the original
> poster gets irritated when he's told to use a hammer to hit the nail
> into the wall, when asked what color your car is.

Thank you for providing to everyone you too are guilty for not reading
things properly :-)

Welcome to the club !

The original poster did not get irritated. Someone unconnected with the
matter got 'irritated'.

Have a nice day.

Paul.


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Re: [CentOS] CentOS 6 Partitioning Help

[Rudi Ahlers]

On Thu, Sep 1, 2011 at 3:14 PM, Lamar Owen  wrote:
> On Wednesday, August 31, 2011 10:07:01 PM Always Learning wrote:
>> I assume your machine is a single user machine. If so, I would suggest
>
> He stated clearly in his request that this was for a server, by definition a 
> multi-user machine (each server process should, after all, run as a unique 
> user) serving requests to many users.
>
> Advice for a single-user desktop won't help him.
> ___


just goes to show how well people actually read anything on the
internet these days. and then they can't understand why the original
poster gets irritated when he's told to use a hammer to hit the nail
into the wall, when asked what color your car is.


-- 
Kind Regards
Rudi Ahlers
SoftDux

Website: http://www.SoftDux.com
Technical Blog: http://Blog.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532
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Re: [CentOS] CentOS 6 Partitioning Help

[Lamar Owen]

On Wednesday, August 31, 2011 10:07:01 PM Always Learning wrote:
> I assume your machine is a single user machine. If so, I would suggest

He stated clearly in his request that this was for a server, by definition a 
multi-user machine (each server process should, after all, run as a unique 
user) serving requests to many users.

Advice for a single-user desktop won't help him.
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Re: [CentOS] Timeframe for httpd update (CVE-2011-3192)

[Always Learning]

On Thu, 2011-09-01 at 14:47 +0200, Timo Schoeler wrote:

> thus Always Learning spake:

> > Please remember excellent CENTOS is a FREE product produced by
> > VOLUNTEERS.

> First possibility: I don't get your sarcasm.

Timo,

My comment was not intended to be sarcastic. It was a factual statement
made by me because I am always aware how lucky we are to have a good,
stable and reliable operating system created (or converted) and
maintained by volunteers.

The volunteers have ordinary lives and paying jobs in addition to their
voluntary tasks for Centos.  They can have very busy days, sick days and
problems with their paying work, family, friends and community et cetera
which reduce the time and energy they have for their Centos
volunteering.  Despite this, I think the volunteers do a praise-worthy
job which benefits all of us.

Being realistic, pragmatic and understanding is probably advantageous.

Mfg,

Paul.


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Re: [CentOS] Timeframe for httpd update (CVE-2011-3192)

[Les Mikesell]

On Thu, Sep 1, 2011 at 7:50 AM, Juergen Gotteswinter  wrote:
>
> how about getting a rhel subscription and stop flaming around here?
>
> just a suggestion...

Is that going to help fix the vulnerabilities on the  bazillion
installed Centos systems whose admins don't read to the end of every
thread here and don't know anything about CR but are expecting 'yum
update' to work as described?

-- 
  Les Mikesell
lesmikes...@gmail.com
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Re: [CentOS] Timeframe for httpd update (CVE-2011-3192)

[Juergen Gotteswinter]

Am 01.09.11 14:47, schrieb Timo Schoeler:
> thus Always Learning spake:
>> On Thu, 2011-09-01 at 12:29 +0200, Timo Schoeler wrote:
>>> That's exactly what I mean about the 'transparency' aspect. This was a
>>> very very big issue with impact on many many machines. Administrators
>>> sitting there waiting for that update, maybe sleepless because
>>> workarounds didn't do what they were supposed to do.
>>>
>>> Regarding that update already being mirrored: No communication here.
>>> That's hilarious.
>>
>> Please remember excellent CENTOS is a FREE product produced by
>> VOLUNTEERS.
>
> First possibility: I don't get your sarcasm.
>
> Second possibility: You don't remember the discussion about what the
> "community" in CentOS is around the first months of 2011.


how about getting a rhel subscription and stop flaming around here?

just a suggestion...

cheers,

juergen
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Re: [CentOS] Timeframe for httpd update (CVE-2011-3192)

[Timo Schoeler]

thus Always Learning spake:
> On Thu, 2011-09-01 at 12:29 +0200, Timo Schoeler wrote:
>> That's exactly what I mean about the 'transparency' aspect. This was a
>> very very big issue with impact on many many machines. Administrators
>> sitting there waiting for that update, maybe sleepless because
>> workarounds didn't do what they were supposed to do.
>>
>> Regarding that update already being mirrored: No communication here.
>> That's hilarious.
> 
> Please remember excellent CENTOS is a FREE product produced by
> VOLUNTEERS.

First possibility: I don't get your sarcasm.

Second possibility: You don't remember the discussion about what the
"community" in CentOS is around the first months of 2011.
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Re: [CentOS] Timeframe for httpd update (CVE-2011-3192)

[Always Learning]

On Thu, 2011-09-01 at 12:29 +0200, Timo Schoeler wrote:
> 
> That's exactly what I mean about the 'transparency' aspect. This was a
> very very big issue with impact on many many machines. Administrators
> sitting there waiting for that update, maybe sleepless because
> workarounds didn't do what they were supposed to do.
> 
> Regarding that update already being mirrored: No communication here.
> That's hilarious.

Please remember excellent CENTOS is a FREE product produced by
VOLUNTEERS.




-- 
With best regards,

Paul.
England,
EU.


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Re: [CentOS] Update to CentOS 6.0 without CD/DVD reader

[Artifex Maximus]

Hello,

On Tue, Aug 30, 2011 at 1:22 PM, John Doe  wrote:
> From: Timothy Murphy 
>
> I really think it would be easier to make a USB key/disk...
> But, I tried the following yearsss ago... so did not test if it is still 
> working...
> Copy DVD files to HD (if netinstall, you don't need to copy isos):
>   cp /mnt/cdrom/syslinux/vmlinuz /boot/vmlinuz-c6
>   cp /mnt/cdrom/syslinux/initrd.img /boot/initrd-c6.img
>   mkdir -p /path/to/c6/images
>   cp /mnt/cdrom/images/install.img /path/to/c6/images/
>   cp *.iso /path/to/c6/
> Add the entry to your grub (change the root to match your setup):
>   title CentOS 6 Install
>       root (hd0,0)
>       kernel vmlinuz-c6
>       initrd initrd-c6.img
> You could maybe also directly specify where the images/isos are:
>   repo=hd:sd??:/path/to/c6
> And be sure that "/path/to/c6" is not formated as you install...
> Again, not tested at all...

This is working with Centos 5 but does not working with Centos 6 for
me. Instead I copy the *content* of DVD to the specified directory not
the ISO file itself. Looks like Centos 6 does not recognize ISO file
as installation medium and use the specified folder as a real folder.
Take a look on this:

http://wiki.centos.org/HowTos/InstallFromUSBkey

Bye,
a
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Re: [CentOS] Apache warns Web server admins of DoS attack tool

[Karanbir Singh]

Thanks Tom,

On 09/01/2011 02:05 AM, Tom Lanyon wrote:
> For EL 4, 5, 6:
> https://rhn.redhat.com/errata/RHSA-2011-1245.html

rpms for C5 are pushed into the 5.6/cr/ repo; the c6 build is running 
now, we will have the cr stuff up for that today and get this into there 
as well.

Unless Tru gets to it before me, I'll get the c4 builds out as well in a 
bit.

- KB
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Re: [CentOS] Error installing latest CentOS kernel from %post section of kickstart

[John Doe]

From: Alfred von Campe 

>     Installing     : kernel-2.6.32-71.29.1.el6.i686                      
> 185/378
> grubby fatal error: unable to find a suitable template

In the mean time, I just manualy add the grub entry for the new kernel 
and it boots fine (not sure if there are other side effects though).

JD
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Re: [CentOS] Timeframe for httpd update (CVE-2011-3192)

[Timo Schoeler]

thus Karanbir Singh spake:
> On 09/01/2011 11:15 AM, Timo Schoeler wrote:
>> is there any time frame foreseeable for KB providing an update for httpd?
> 
> the rpm is already pushed, should be on the mirrors now'ish.

That's exactly what I mean about the 'transparency' aspect. This was a
very very big issue with impact on many many machines. Administrators
sitting there waiting for that update, maybe sleepless because
workarounds didn't do what they were supposed to do.

Regarding that update already being mirrored: No communication here.
That's hilarious.

>> (Given that 5.7 is still to be done, 6.1, etc., and due to the fact
>> there is "no such thing as a CentOS community", as was discussed end of
>> 2010/early 2011. That's why I'm *not* going to provide my diff -- I'm
>> not willing to spend my work into an entity that denies transparency.)
> 
> no one asked you to do anything.

Where did I imply that?

> Also, because you cant get your head 
> around things does not imply that no one else does.

Crystal ball, etc.

> - KB
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Re: [CentOS] Timeframe for httpd update (CVE-2011-3192)

[Karanbir Singh]

On 09/01/2011 11:15 AM, Timo Schoeler wrote:
> is there any time frame foreseeable for KB providing an update for httpd?

the rpm is already pushed, should be on the mirrors now'ish.

> (Given that 5.7 is still to be done, 6.1, etc., and due to the fact
> there is "no such thing as a CentOS community", as was discussed end of
> 2010/early 2011. That's why I'm *not* going to provide my diff -- I'm
> not willing to spend my work into an entity that denies transparency.)

no one asked you to do anything. Also, because you cant get your head 
around things does not imply that no one else does.

- KB
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[CentOS] Timeframe for httpd update (CVE-2011-3192)

[Timo Schoeler]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Hi,

is there any time frame foreseeable for KB providing an update for httpd?

Upstream provided their SRPM yesterday, i.e. Aug 31 19:40. [0] [1]

It builds flawless on several machines I tried (Scientific Linux 6,
CentOS 5 and 6).

Question is: Should one deploy a self-build RPM or will there be an
update in the next... "time"?

(Given that 5.7 is still to be done, 6.1, etc., and due to the fact
there is "no such thing as a CentOS community", as was discussed end of
2010/early 2011. That's why I'm *not* going to provide my diff -- I'm
not willing to spend my work into an entity that denies transparency.)

Cheers.

[0] --
ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/httpd-2.2.3-53.el5_7.1.src.rpm

[1] -- https://rhn.redhat.com/errata/RHSA-2011-1245.html
-BEGIN PGP SIGNATURE-
Version: GnuPG v1.4.5 (GNU/Linux)

iD8DBQFOX1tGfg746kcGBOwRAvAdAJ44tVJVjL2V6MPsSVNkUjC/JEvXMwCgvRSP
Z08Y333AW1CYsrKcKlaDIFY=
=2s2l
-END PGP SIGNATURE-
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Re: [CentOS] CentOS 6 Partitioning Map/Schema

[Peter Kjellström]

On Thursday, September 01, 2011 03:21:25 AM Jonathan Vomacka wrote:
> Good Evening All,
> 
> I have a question regarding CentOS 6 server partitioning. Now I know
> there are a lot of different ways to partition the system and different
> opinions depending on the use of the server. I currently have a quad
> core intel system running 8GB of RAM with 1 TB hard drive (single). In
> the past as a FreeBSD user, I have always made a physical volume of the
> root filesystem (/), SWAP, /tmp, /usr, /var, and /home. In the
> partitioning manager I would always specify 10GB for root, 2GB or so for
> SWAP, 20GB var, 50GB usr, 10GB /tmp, and allocate all remaining space to

I don't think the above figures are bad. Then again the CentOS default (/boot 
+ /) and then adding your /home may be more flexible. After that, if I split 
it further, I'd make a stand alone /var and maybe /tmp. Splitting /usr from / 
seems like more trouble than it's worth to me.

Also I'd use LVM for everything but /boot and leave some unused space in the 
VG that I could use for lvextend + resize2fs later.

Just my take on it.

> my home directory as my primary data volume (assuming all my
> applications are installed and ran from my home directories). I was
> recently told that this is an old style of partitioning and is not used
> in modern day Linux distributions. So more accurately, here are my
> questions to the list:
> 
> 1) What is a good partition map/schema for a server OS where it's
> primary purpose is for a LAMP server, DNS (bind), and possibly gameservers
> 
> 2) CentOS docs recommend using 10GB SWAP for 8GB of RAM. 1X the amount
> of physical memory + 2GB added. (Reference:
> http://www.centos.org/docs/5/html/Installation_Guide-en-US/s1-diskpartition
> ing-x86.html). I was told this is ridiculous and will severely slow down
> the system. Is this true?

Disclaimer: the following is based on CentOS-5 and I'm not 100% if all or any 
applies to the CentOS-6 kernel.

* Some swap (as opposed to no swap) seems to increase system stability under 
OOM conditions (depeding on a lot of factors)

* You'll need at least as much swap as the max stack size you intend to set 
(ulimit -s). Usually this is very low but in some instances you need a 
significant percentage of your RAM size. An alternative is to set max stack 
size to unlimited when needed (which _does not_, thankfully, require an 
infinite amount of swap...).

Based on this I'd say just add some swap (like a gig or two) unless you know 
you want a high max stack size.

If you left space in your VG you can always add another chunk of swap later.

> If so, what is a good swap space to use for 8GB
> of RAM? The university of MIT recommends making MULTIPLE 2GB swap spaces

This shouldn't really make much difference. Long ago swap size was limited to 
2G but I don't even remember if that was per swap or in total.. Either way you 
can have 5x 2G or 1x 10G. Linux will balance its usage over all available 
swaps so if you have several independant drives then use swaps on both for 
maximum performance (although it's my feeling that if you need swap 
performance then you're probably doing something wrong...).

> equaling 10GB if this is the case. Please help!
> 
> 3) Is EXT4 better or worse to use then XFS for what I am planning to use
> the system for?

Much has been said here. I'd stay with the dist default unless I had specific 
reasons. If you need >16T you have to use XFS. If you're on 32-bit you have to 
use ext*.

If you're trying to decide based on performance then try it out on your 
hardware (where preferably "it" is close to your actual work load).

/Peter
 
> Thanks in advance for all your help guys
> 
> Kind Regards,
> Jonathan Vomacka


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Re: [CentOS] CentOS 6 Partitioning Map/Schema

[John Hodrien]

On Thu, 1 Sep 2011, ken wrote:

> In the absence of actual evidence to the contrary, I'd go with the
> recommendations in the docs regarding swap.

Personally, I think that advice needs updating for machines with large amounts
of memory to include an upper bound.  In general use I'm not sure I can see
going above 8Gbytes of swap, and certainly with 96Gbytes of RAM, I'm not about
to allocate a considerable chunck of disk to either doing nothing for the
lifetime of the machine, or more likely every now and then created a long
grinding death due to runaway memory consumption where it would have simply
gone swiftly pop otherwise.

jh
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Re: [CentOS] CentOS 6 Partitioning Map/Schema

[ken]

On 08/31/2011 09:21 PM Jonathan Vomacka wrote:
> Good Evening All,
> 
> I have a question regarding CentOS 6 server partitioning. Now I know 
> there are a lot of different ways to partition the system and different 
> opinions depending on the use of the server. I currently have a quad 
> core intel system running 8GB of RAM with 1 TB hard drive (single). In 
> the past as a FreeBSD user, I have always made a physical volume of the 
> root filesystem (/), SWAP, /tmp, /usr, /var, and /home. In the 
> partitioning manager I would always specify 10GB for root, 2GB or so for 
> SWAP, 20GB var, 50GB usr, 10GB /tmp, and allocate all remaining space to 
> my home directory as my primary data volume (assuming all my 
> applications are installed and ran from my home directories). I was 
> recently told that this is an old style of partitioning and is not used 
> in modern day Linux distributions. So more accurately, here are my 
> questions to the list:
> 
> 1) What is a good partition map/schema for a server OS where it's 
> primary purpose is for a LAMP server, DNS (bind), and possibly gameservers

If you have a currently running system serving the same purpose and
running the same OS version, consult the partitioning scheme there,
adjusting the sizes up or down depending upon how much is used.

The size of /home is going to depend upon how many users will have
accounts on the system and how much space you're going to allow per
user.  I'd double the space for a typical user, then multiply that by
the number of users.  Set up a quota system with hard and soft limits to
eliminate surprises.

And why don't you use LVM?  Then you can adjust the sizes of the volumes
as you need them.

If this is to be an enterprise system on which you'll be doing live
backups, you may also want to set up a snapshot LV.


> 
> 2) CentOS docs recommend using 10GB SWAP for 8GB of RAM. 1X the amount 
> of physical memory + 2GB added. (Reference: 
> http://www.centos.org/docs/5/html/Installation_Guide-en-US/s1-diskpartitioning-x86.html).
>  
> I was told this is ridiculous and will severely slow down the system. Is 
> this true? If so, what is a good swap space to use for 8GB of RAM? The 
> university of MIT recommends making MULTIPLE 2GB swap spaces equaling 
> 10GB if this is the case. Please help!

In the absence of actual evidence to the contrary, I'd go with the
recommendations in the docs regarding swap.

As for swap 'severely slowing down the system', I think that's bunk.
Well, theoretically any empty disk space is going to slow down disk
reads a bit, but then so would occupied disk space which isn't used, but
neither of these is a 'severe problem'.  So she must be speaking of the
algorithm used in determining what and when something is written to
swap.  To have an intelligent opinion on the usefulness and efficiency
of swap would require a detailed understanding of that algorithm
alongside one of the system as a whole.  Did she do her master's thesis
or doctoral dissertation on this topic?  Okay, maybe swap is totally
unnecessary and the developers are keeping everyone in the dark about
the details just to create and keep jobs for themselves.  But the code
is open source, so that sounds too much like an April Fool's Day posting
to slashdot.

As for MIT's suggestion, yeah, that is a good idea.  I did this on some
machines years back and noticed a considerable speed increase.  In most
instances though all swap spaces should have the same priority.


> 
> 3) Is EXT4 better or worse to use then XFS for what I am planning to use 
> the system for?

Which features of each might you plan on making use of?


> 
> Thanks in advance for all your help guys

If you're truly interested in performance, run some metrics before any
users get on the system and periodically thereafter.  This will give you
a baseline for evaluation of changes you'll inevitably make and others
which just happen.


I predict a long and contentious thread on these topics (When do we not
have that?) along with scattered earthquakes and sunspots.  I'll be
missing the impact of most of those as I'm bringing this machine down
for 'maintenance'.  Just thought everyone would be interested in knowing
that.  :)


> 
> Kind Regards,
> Jonathan Vomacka

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Re: [CentOS] CentOS 6, KDE 4: bad DNS traffic

[John Hodrien]

On Wed, 31 Aug 2011, m.r...@5-cent.us wrote:

> Does rpm -qi autofs show nothing? If so, I'm a tad surprised, since that
> takes care of not only nfs but also CD/DVDs and USB keys.

I don't believe that's true.

jh
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Re: [CentOS] [C6] Some typical apps missing?

[Marko Vojinovic]

On Tue, Aug 30, 2011 at 4:50 PM,   wrote:
> Les Mikesell wrote:
>> 2011/8/30 Peter Kjellström :
>>> On Tuesday, August 30, 2011 02:56:35 PM Marko Vojinovic wrote:
 I just installed CentOS 6 on one of my desktop machines, and yum now
 tells me that some of my favorite apps are not present in any of the
 repositories I configured. To name a few: ktorrent, kile, krusader,
> 
>> You probably definitely want EPEL, and also note that rpmforge has
>> been rearranged into several sections, some of which aren't enabled by
>> default in the stock rpmforge-release.  This is also true in 5.x now
>> but you may have installed your apps before the change.
>
> And that rpmforge has been renamed to repoforge. Also, there's rpmfusion,
> which is good.

Thanks to everyone for suggestions. I configured EPEL, rpmfusion and
ATrpms (using the priorities plugin wisely :-) ), and I'll see what I
can dig up. Also, I guess that maybe it is just too early, and
repoforge will eventually get populated with everything relevant. Kile
and krusader are two main things that I'm still missing, but it's
nothing urgent anyway... ;-)

Thanks again to all!

Best, :-)
Marko
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