Re: [CentOS] CentOS-7-x86_64-dvd-2009.iso is too big for DVD blanks

[Michel van Deventer]

Hi,

you can also burn it to a DL (dual layer) DVD (like the Centos 8 image).

regards,

   Michel


On 2021-03-15 02:13, Robert G. (Doc) Savage via CentOS wrote:

I need help from someone experienced with the CentOS bug tracking
system. I gotta say it is one of the most complicated and imposing
front ends I've ever seen. Could anyone familiar with it please file a
bug on my behalf? Particulars:

"CentOS 7.9.2009 DVD iso image too large"

ISO image: CentOS-7-x86_64-DVD-2009.iso 4.7GB raw CD image
Wed Nov  4 05:37:25 2020
Burners: Both K3B and Brasero
Media: Both DVD-R and DVD+R single-layer disks

iso image: 4,712,300,544 bytes
User Anthony F McInerney advises Wikipedia says
DVD-R capacity: 4,707,319,808 bytes (max)

I have tried burning this same iso image on two different machines: a
CentOS 7.9 server and a Fedora 33 laptop. Same failure on both.

We need to ask the developers to make a re-spin that's about 5MB
smaller. And before someone suggests it, the 2010-vintage server I'm
trying to install CentOS on does not support booting from a thumb
drive, so that option is not available.

Thanks,

--Doc Savage
    Fairview Heights, IL

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Re: [CentOS] Network Diagnostics

[Michel van Deventer]

On Tue, 2020-01-07 at 13:21 +, Chris Olson via CentOS wrote:
> 
> One of our personnel at another office suggested using
> Wireshark to check out the network when the printer is
> having difficulty.  Wireshark was apparently not on this
> system so we installed it using yum install.  The tail
> end of the apparently successful installation process
> is shown below.  Unfortunately, we cannot seem to find
> Wireshark on the system.
> 
> Is it possible that Wireshark was not actually installed
> or do we just not know how to locate and use it?
> 
> Is this printer networking issue a known problem and is
> Wireshark the right tool to diagnose the problem?
> 
> Thanks.
> 
> 
> Installed:
>   wireshark.x86_64 0:1.10.14-
> 16.el7 
> 
> Dependency Installed:
>   libsmi.x86_64 0:0.4.8-
> 13.el7   
>
> 
> Complete!
> [user@computer ~]$
> [user@computer ~]$ which wireshark
> /usr/bin/which: no wireshark in
> (/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/home/u
> ser/.local/bin:/home/user/bin)
> [user@computer ~]$ 
> 
the package wireshark does not contain the 'wireshark' binary, you
should use 'tshark' on the commandline.
The 'wireshark' binary is in the wireshark-gnome package and requires a
graphical interface.

tshark takes most of the same parameters as wireshark (if not all)

   Regards,

Michel



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Re: [CentOS] Nasty Fail2Ban update for Centos 7

[Michel van Deventer]

On Tue, 2019-12-31 at 10:19 +0100, Nicolas Kovacs wrote:
> Le 31/12/2019 à 03:14, Allan a écrit :
> > Then gotta dig into Koji, to find the old version, download it,
> > and downgrade to that - and pew, everything is back to normal.
> > 
> > The old one seems to be version 0.9.7 and the new one is 0.10.4
> > 
> > I haven't had time to look into Fail2Bans info about these 2
> > version,
> > but since there is a major version change - is it really possible
> > to
> > just upgrade these ?
> > 
> > Sure, I would love to have a working 0.10.4 for my Centos 7 - but
> > it
> > shouldn't destroy my existing system - or it should at least warn
> > me
> > about that - or what to fix.
> 
> I have automatic updates with yum-cron on all my production servers.
> Fail2ban 
> has been recently upgraded to 0.10.4 and still works perfectly.
We also had it updated and fail2ban worked perfectly except it did not
ban anymore on the sshd jail. This was caused by the
/etc/fail2ban/filter.d/sshd.conf file which should have been replaced
with a new one from the rpm (there was a sshd.conf.rpmnew file).

Below the error we found in /var/log/fail2ban.log :
2019-12-09 10:02:15,294 fail2ban.filtersystemd  [13628]: INFO[sshd]
Added journal match for: '_SYSTEMD_UNIT=sshd.service + _COMM=sshd'
2019-12-09 10:02:15,295 fail2ban.filter [13628]: ERROR   No
failure-id group in 'normal'
2019-12-09 10:02:15,295 fail2ban.transmitter[13628]: WARNING
Command ['set', 'sshd', 'addfailregex', 'normal'] has failed. Received
RegexException("No failure-id group in 'normal'",)
2019-12-09 10:02:15,295 fail2ban[13628]: ERROR   NOK:
("No failure-id group in 'normal'",)
 
  Regards,

Michel



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Re: [CentOS] rescue - UEFI revert to BIOS boot - how?

[Michel van Deventer]

Hi,

I had the same sort of issue. My workstation with a Asrock motherboard 
suddenly decided to reset UEFI to defaults which caused my Fedora 
installation not to boot. I could boot with a Live USB stick and use 
efibootmgr to set the UEFI boot for Fedora but next time I powered on my 
machine the same issue happened (I remove AC power from my workstation 
when it is not in use). Turned out to be a flat battery for the BIOS 
(coin cell). I replaced the coin cell and set the UEFI boot with the 
Live USB stick and all was well.

The efibootmgr command was something like :
efibootmgr -c --part 2 --loader /EFI/Fedora/grubx64.efi --label Fedora

Please check the manpage of efibootmgr,  the process of how to setup the 
UEFI boot is described very well.


Regards,

   Michel


On 2018-11-21 05:00, Steven Tardy wrote:

On Tue, Nov 20, 2018 at 7:40 AM lejeczek via CentOS 
wrote:


hi guys

I have a box on which UEFI boot has gone haywire and instead
of boot it power the box down, that is before even going to
grub2. (displays some error message)
I if change to BIOS boot then I can start Centos' rescue -
my question is: how can I rescue, re-build grub so it would
boot from tradition BIOS?



If the OS was installed with UEFI enabled I would go back to UEFI mode.

Then re-add your OS boot configuration within the BIOS setup screen.

Most motherboard manufacturers detail this process on their website 
where
you browse the disk to select somefilename.efi and give it a label 
“CentOS”.





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Re: [CentOS] Corosync init-script broken on CentOS6

[Michel van Deventer]

Hi,

Did you configure corosync ? 
Normally corosync starts pacemaker, which in turn starts the heartbeat
deamons.
But you have to configure the latter using for example a pcmk file with
configuration in /etc/corosync/conf.d/ (from the top of my head).
I normally use :
http://www.clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Clusters_from_Scratch/

Regards,

Michel

On Wed, 2011-11-23 at 12:16 -0500, Hal Martin wrote:
> Hello all,
> 
> I am trying to create a corosync/pacemaker cluster using CentOS 6.0.
> However, I'm having a great deal of difficulty doing so.
> 
> Corosync has a valid configuration file and an authkey has been generated.
> 
> When I run /etc/init.d/corosync I see that only corosync is started.
> >From experience working with corosync/pacemaker before, I know that
> this is not enough to have a functioning cluster. For some reason the
> base install (with or without updates) is not starting corosync
> dependencies.
> 
> I've even tried using corosync/pacemaker for the EPEL 6 repo, and
> still the init-script will not start corosync dependencies.
> 
> Expected:
> corosync
> /usr/lib64/heartbeat/stonithd
> /usr/lib64/heartbeat/cib
> /usr/lib64/heartbeat/lrmd
> /usr/lib64/heartbeat/attrd
> /usr/lib64/heartbeat/pengine
> 
> Observed:
> corosync
> 
> My install options are:
> %packages
> @base
> @core
> @ha
> @nfs-file-server
> @network-file-system-client
> @resilient-storage
> @server-platform
> @server-policy
> @storage-client-multipath
> @system-admin-tools
> pax
> oddjob
> sgpio
> pacemaker
> dlm-pcmk
> screen
> lsscsi
> -rgmanager
> %end
> 
> The logs from the server aren't terribly helpful either:
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [pcmk  ] info: spawn_child:
> Forked child 2515 for process stonith-ng
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [pcmk  ] info: spawn_child:
> Forked child 2516 for process cib
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [pcmk  ] info: spawn_child:
> Forked child 2517 for process lrmd
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [pcmk  ] info: spawn_child:
> Forked child 2518 for process attrd
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [pcmk  ] info: spawn_child:
> Forked child 2519 for process pengine
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [pcmk  ] info: spawn_child:
> Forked child 2520 for process crmd
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [SERV  ] Service engine
> loaded: Pacemaker Cluster Manager 1.1.2
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [SERV  ] Service engine
> loaded: corosync extended virtual synchrony service
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [SERV  ] Service engine
> loaded: corosync configuration service
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [SERV  ] Service engine
> loaded: corosync cluster closed process group service v1.01
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [SERV  ] Service engine
> loaded: corosync cluster config database access v1.01
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [SERV  ] Service engine
> loaded: corosync profile loading service
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [SERV  ] Service engine
> loaded: corosync cluster quorum service v0.1
> Nov 23 12:13:45 cheapo4 corosync[2509]:   [MAIN  ] Compatibility mode
> set to whitetank.  Using V1 and V2 of the synchronization engine.
> Nov 23 12:13:46 cheapo4 corosync[2509]:   [pcmk  ] ERROR:
> pcmk_wait_dispatch: Child process lrmd exited (pid=2517, rc=100)
> Nov 23 12:13:46 cheapo4 corosync[2509]:   [pcmk  ] notice:
> pcmk_wait_dispatch: Child process lrmd no longer wishes to be
> respawned
> Nov 23 12:13:46 cheapo4 corosync[2509]:   [pcmk  ] info:
> update_member: Node cheapo4.jrz.cbn now has process list:
> 00111302 (1118978)
> Nov 23 12:13:46 cheapo4 corosync[2509]:   [pcmk  ] ERROR:
> pcmk_wait_dispatch: Child process cib exited (pid=2516, rc=100)
> Nov 23 12:13:46 cheapo4 corosync[2509]:   [pcmk  ] notice:
> pcmk_wait_dispatch: Child process cib no longer wishes to be respawned
> Nov 23 12:13:46 cheapo4 corosync[2509]:   [pcmk  ] info:
> update_member: Node cheapo4.jrz.cbn now has process list:
> 00111202 (1118722)
> Nov 23 12:13:46 cheapo4 corosync[2509]:   [pcmk  ] ERROR:
> pcmk_wait_dispatch: Child process crmd exited (pid=2520, rc=100)
> Nov 23 12:13:46 cheapo4 corosync[2509]:   [pcmk  ] notice:
> pcmk_wait_dispatch: Child process crmd no longer wishes to be
> respawned
> Nov 23 12:13:46 cheapo4 corosync[2509]:   [pcmk  ] info:
> update_member: Node cheapo4.jrz.cbn now has process list:
> 00111002 (1118210)
> Nov 23 12:13:46 cheapo4 corosync[2509]:   [pcmk  ] ERROR:
> pcmk_wait_dispatch: Child process attrd exited (pid=2518, rc=100)
> Nov 23 12:13:46 cheapo4 corosync[2509]:   [pcmk  ] notice:
> pcmk_wait_dispatch: Child process attrd no longer wishes to be
> respawned
> Nov 23 12:13:46 cheapo4 corosync[2509]:   [pcmk  ] info:
> update_member: Node cheapo4.jrz.cbn now has process list:
> 00110002 (1114114)
> Nov 

Re: [CentOS] Web Site centos.org is down

[Michel van Deventer]

On Wed, 2011-08-17 at 19:41 +0100, Always Learning wrote:
> On Wed, 2011-08-17 at 19:32 +0100, Ken Smith wrote:
> > Fine here on Claranet South London UK
> 
> I'm trying from one of their London data centres, without success
Fine from here (Netherlands)

traceroute to www.centos.org (72.232.194.162), 30 hops max, 60 byte
packets
 1  ap.grote.net (192.168.100.4)  0.239 ms  0.249 ms  0.283 ms
 2  lo1.dr6.d12.xs4all.net (194.109.5.213)  22.873 ms  26.838 ms  26.873
ms
 3  1416.ae3.xr4.1d12.xs4all.net (194.109.7.137)  22.742 ms  22.741 ms
22.736 ms
 4  asd-dc2-ias-ur10.nl.kpn.net (194.151.244.74)  26.692 ms  26.724 ms
26.691 ms
 5  asd2-rou-1022.nl.eurorings.net (195.190.227.221)  26.699 ms  26.691
ms  30.444 ms
 6  nyk-s1-rou-1001.US.eurorings.net (134.222.226.170)  118.541 ms
117.590 ms  117.575 ms
 7  nyk-s1-rou-1021.US.eurorings.net (134.222.226.2)  113.604 ms
135.192 ms  135.168 ms
 8  ahbn-s1-rou-1041.US.eurorings.net (134.222.228.10)  143.115 ms
143.108 ms  107.208 ms
 9  ahbn-s1-rou-1001.US.eurorings.net (134.222.226.57)  107.201 ms
ahbn-s1-rou-1001.US.eurorings.net (134.222.226.53)  111.149 ms
ahbn-s1-rou-1001.US.eurorings.net (134.222.226.57)  111.142 ms
10  xe-7-1-0.edge1.Washington4.Level3.net (4.53.112.53)  111.150 ms
111.186 ms  111.160 ms
11  vlan70.csw2.Washington1.Level3.net (4.69.149.126)  115.034 ms
vlan80.csw3.Washington1.Level3.net (4.69.149.190)  131.070 ms  131.042
ms
12  ae-91-91.ebr1.Washington1.Level3.net (4.69.134.141)  134.965 ms
134.937 ms ae-61-61.ebr1.Washington1.Level3.net (4.69.134.129)  107.262
ms
13  ae-2-2.ebr3.Atlanta2.Level3.net (4.69.132.85)  151.180 ms  147.212
ms  151.137 ms
14  ae-7-7.ebr3.Dallas1.Level3.net (4.69.134.21)  139.089 ms  143.037 ms
143.045 ms
15  ae-73-73.csw2.Dallas1.Level3.net (4.69.151.145)  150.940 ms
ae-63-63.csw1.Dallas1.Level3.net (4.69.151.133)  147.025 ms
ae-83-83.csw3.Dallas1.Level3.net (4.69.151.157)  146.992 ms
16  ae-22-70.car2.Dallas1.Level3.net (4.69.145.68)  146.894 ms
ae-32-80.car2.Dallas1.Level3.net (4.69.145.132)  146.952 ms
ae-22-70.car2.Dallas1.Level3.net (4.69.145.68)  143.067 ms
17  DATABANK-HO.car2.Dallas1.Level3.net (4.71.170.2)  142.983 ms
142.993 ms  142.981 ms
18  * * *
19  www.centos.org (72.232.194.162)  154.979 ms !X  154.962 ms !X
154.926 ms !X

Regards,

Michel


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Re: [CentOS] Why is iptables configured to accept packets on ports 50 and 51?

[Michel van Deventer]

Hi,

On Tue, 2011-05-17 at 11:13 -0700, Aleksey Tsalolikhin wrote:
> [root@hwdltsaloli ~]# cat /etc/sysconfig/iptables
> # Firewall configuration written by system-config-securitylevel
> # Manual customization of this file is not recommended.
> *filter
> :INPUT ACCEPT [0:0]
> :FORWARD ACCEPT [0:0]
> :OUTPUT ACCEPT [0:0]
> :RH-Firewall-1-INPUT - [0:0]
> -A INPUT -j RH-Firewall-1-INPUT
> -A FORWARD -j RH-Firewall-1-INPUT
> -A RH-Firewall-1-INPUT -i lo -j ACCEPT
> -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
> -A RH-Firewall-1-INPUT -p 50 -j ACCEPT
> -A RH-Firewall-1-INPUT -p 51 -j ACCEPT
> -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
> -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
> COMMIT
> [root@hwdltsaloli ~]# lsof -i:50
> [root@hwdltsaloli ~]# lsof -i:51
> [root@hwdltsaloli ~]#
> 
> 
> /etc/services says:
> 
> re-mail-ck  50/tcp  # Remote Mail Checking 
> Protocol
> re-mail-ck  50/udp  # Remote Mail Checking 
> Protocol
> 
> la-maint51/tcp  #
> la-maint51/udp  # IMP Logical Address
> Maintenance
> 
> Google turns up RMCP is a simple lightweight DP protocol for checking
> if you have mail on a server
> 
> A quick Google search failed to turn up what is "IMP Logical Address
> Maintenance"
The -p you are referring to is NOT a port, but a protocol (number), 50
and 51 stand for IPSEC protocols (AH and ESP).

[michel@deltaflyer ~]$ cat /etc/protocols | grep 51
ah  51  AH  # Authentication Header
ipv6-auth   51  IPv6-Auth   # Authentication Header for 
IPv6 (not in
official list)
[michel@deltaflyer ~]$ cat /etc/protocols | grep 50
esp 50  ESP # Encap Security Payload
ipv6-crypt  50  IPv6-Crypt  # Encryption Header for IPv6 
(not in official
list)


Please read 'man iptables' :)

Regards,

Michel



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Re: [CentOS] Server offline :-( please help to repair software RAID

[Michel van Deventer]

On Thu, 2011-04-28 at 21:52 +0200, Alexander Farber wrote:
> On the 2nd try it has booted and seems to work.
Did it give an error on the first try and if so, which one ?

You should check /var/log/messages for i/o errors and check your disks
with smartctl

I have had my raid1 arrays rebuild sometime without a (for me known)
reason. Even had a defective networkcard kernel panic the machine for
two hours and the raids were still working afterwards ;) 

Regards,

Michel


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Re: [CentOS] Server offline :-( please help to repair software RAID

[Michel van Deventer]

Hi,

On Thu, 2011-04-28 at 21:26 +0200, Alexander Farber wrote:
> Hello, I didn't touch anything, just booted the hoster's "rescue image".
Cool :)

> # cat /proc/mdstat
> Personalities : [linear] [raid0] [raid1]
> md0 : active raid1 sda1[0] sdb1[1]
>   1023936 blocks [2/2] [UU]
> 
> md1 : active raid1 sda3[0] sdb3[1]
>   20479936 blocks [2/2] [UU]
> resync=DELAYED
> 
> md2 : active raid1 sda5[0] sdb5[1]
>   277728192 blocks [2/2] [UU]
> 
> md3 : active raid1 sda6[0] sdb6[1]
>   185151360 blocks [2/2] [UU]
>   [=>...]  resync = 85.3% (158109056/185151360)
> finish=5.3min speed=83532K/sec
> 
Let md3 rebuild, wait for md1 to rebuild (check regularly with
cat /proc/mdstat) and reboot your machine without the rescue, it should
come up again.

Regards,

Michel



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Re: [CentOS] Server offline :-( please help to repair software RAID

[Michel van Deventer]

Hi,

what is the output of 'cat /proc/mdstat' ?

A healthy raid should look something like below :
[root@janeway ~]# cat /proc/mdstat 
Personalities : [raid1] 
md2 : active raid1 sdb1[0] sda1[1]
  256896 blocks [2/2] [UU]
  
md0 : active raid1 sdd1[0] sdc1[1]
  1465135936 blocks [2/2] [UU]
  
md3 : active raid1 sdb3[1] sda3[0]
  730218432 blocks [2/2] [UU]

I have 3 RAID1 arrays (over 4 disks)

On Thu, 2011-04-28 at 21:10 +0200, Alexander Farber wrote:
> Additional info (how many RAID arrays do I have??):
> 
> # mdadm -D /dev/md3
> /dev/md3:
> Version : 00.90
>   Creation Time : Sat Mar 19 22:53:25 2011
>  Raid Level : raid1
>  Array Size : 185151360 (176.57 GiB 189.59 GB)
>   Used Dev Size : 185151360 (176.57 GiB 189.59 GB)
>Raid Devices : 2
>   Total Devices : 2
> Preferred Minor : 3
> Persistence : Superblock is persistent
> 
> Update Time : Thu Apr 28 21:09:12 2011
>   State : clean, resyncing
>  Active Devices : 2
> Working Devices : 2
>  Failed Devices : 0
>   Spare Devices : 0
> 
>  Rebuild Status : 38% complete
> 
>UUID : 1b3668a3:4b6c5593:3d186b3c:53958f34
>  Events : 0.15
> 
> Number   Major   Minor   RaidDevice State
>0   860  active sync   /dev/sda6
>1   8   221  active sync   /dev/sdb6
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Re: [CentOS] 5.6 update experience - EXCELLENT!

[Michel van Deventer]

>>
>>Just updated 98 packages on this ole hardware raid 10 box - 5.6 final is
>>running just fine. No problems. THANKS.
>
> Topping that; 175 packages dropped in on my test-machine at work. 8-)
> Feels like
> I'm getting spoiled with updates like this that "just work". ;*)
>
> So far, so good. Great work CentOS-team/devs! Thanks from Uppsala/Sweden!
Yesterday I updated my 10 Xen/KVM VM's at home and the three VPS'es I
have. No issues whatsoever :) !!! GREAT WORK CentOS team !

The update was worth the wait :)

   Regards,

   Michel

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Re: [CentOS] Can anyone suggest a SCSI 3 card in either PCI-X or PCI-E x 4 for a Dell Poweredge 2900?

[Michel van Deventer]

On Thu, 2011-04-07 at 12:17 -0700, John R Pierce wrote:
> On 04/07/11 10:49 AM, Michel van Deventer wrote:
> > What about a PERC4 from Dell (LSI Megaraid , PCI-X). You should be able
> > to find them for a reasonable price on Ebay (70 euro). I used to have a
> > few lying around ;)
> >
> 
> raid controllers are problematic for tape devices.   many don't support 
> plain passthrough SCSI
Well, I did use one of these controllers for a tape drive actually :)
  
Regards,

Michel


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Re: [CentOS] Can anyone suggest a SCSI 3 card in either PCI-X or PCI-E x 4 for a Dell Poweredge 2900?

[Michel van Deventer]

On Thu, 2011-04-07 at 18:55 +0100, Kevin Thorpe wrote:
> On Thu, Apr 7, 2011 at 6:49 PM, Michel van Deventer
>  wrote:
> > On Thu, 2011-04-07 at 10:45 -0700, John R Pierce wrote:
> >> On 04/07/11 10:23 AM, Kevin Thorpe wrote:
> >> > The only PCI-X card I have is an old ICP Vortex RAID controller and
> >> > the Dell hangs with that installed (BIOS is disabled).
> >> >
> >> > It's only for a tape drive so performance isn't really an issue.
> >>
> >> parallel scsi is becoming somewhat archaic, and probably getting harder
> >> to find, but I've always liked the LSI Logic scsi cards.
> >>
> >> for PCI-X, that would be a LSI-U320, and for PCI-E X4, a LSU20320IE
> >> (both those have internal and external and external connectors on the
> >> same U320 SCSI channel)
> >>
> >>
> >> a few more choices here,
> >> http://www.lsi.com/storage_home/products_home/host_bus_adapters/scsi_hbas/index.html
> >> (some have dual channels, others have different connectors)
> > What about a PERC4 from Dell (LSI Megaraid , PCI-X). You should be able
> > to find them for a reasonable price on Ebay (70 euro). I used to have a
> > few lying around ;)
> 
> It already has a PERC6 (I think) but that's fully occupied with the
> RAID. Am I asking for
> trouble having both installed?
No that should not be a problem. The PERC4 is fully supported under
Centos btw ;)

 Regards,

 Michel

p.s. I have a PERC4 available if you nee one, please contact me offlist,
we can work something out.


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Re: [CentOS] Can anyone suggest a SCSI 3 card in either PCI-X or PCI-E x 4 for a Dell Poweredge 2900?

[Michel van Deventer]

On Thu, 2011-04-07 at 10:45 -0700, John R Pierce wrote:
> On 04/07/11 10:23 AM, Kevin Thorpe wrote:
> > The only PCI-X card I have is an old ICP Vortex RAID controller and
> > the Dell hangs with that installed (BIOS is disabled).
> >
> > It's only for a tape drive so performance isn't really an issue.
> 
> parallel scsi is becoming somewhat archaic, and probably getting harder 
> to find, but I've always liked the LSI Logic scsi cards.
> 
> for PCI-X, that would be a LSI-U320, and for PCI-E X4, a LSU20320IE  
> (both those have internal and external and external connectors on the 
> same U320 SCSI channel)
> 
> 
> a few more choices here, 
> http://www.lsi.com/storage_home/products_home/host_bus_adapters/scsi_hbas/index.html
> (some have dual channels, others have different connectors)
What about a PERC4 from Dell (LSI Megaraid , PCI-X). You should be able
to find them for a reasonable price on Ebay (70 euro). I used to have a
few lying around ;)

Regards,

Michel



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Re: [CentOS] Run from usb

[Michel van Deventer]

A quick Google search on 'centos from usbstick' returned the following
link (among others) :
https://projects.centos.org/trac/livecd/wiki/ImageFlash

Regards,

Michel

On Sat, 2011-04-02 at 14:53 +0200, Kai Schaetzl wrote:
> Mattias wrote on Sat, 2 Apr 2011 14:19:17 +0200:
> 
> > I will run centos from usb like you can with e.g ubuntu
> > A usb pendrive
> 
> And what is the problem? This information is all available on the net.
> 
> Kai
> 
> 
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Re: [CentOS] Run from usb

[Michel van Deventer]

You could try to be more specific ??

What do you want to run from USB ? And from what device ? 

On Sat, 2011-04-02 at 13:49 +0200, mattias wrote:
> Are it possible?
> With full root access?
> And gnome etc
> 
> 
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Re: [CentOS] SSH Automatic Log-on Failure - Centos 5.5

[Michel van Deventer]

Hi,

> On Thu, 2011-01-27 at 20:30 +0100, Michel van Deventer wrote:
>
>> Lots from China, Russia and some South American countries. Sometimes
>> even from my own country ! (Netherlands).
>
> Attempts from Holland always, in my experience, come from Leaseweb IPs
> but complaining to them produces no results.
The most recent one came from a company in Amsterdam which stopped 5
minutes after I mailed the abuse address :)

> P.S. 'Een brug te ver' I saw in Deventer when it was first released. Een
> mooi stad met een leuke binnenstad. I hope it is still the same.
I wouldn't know, my last name is 'van Deventer' but I have been only twice
to Deventer in my life ;)

Regards,

Michel


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Re: [CentOS] SSH Automatic Log-on Failure - Centos 5.5

[Michel van Deventer]

Hi,

On Thu, 2011-01-27 at 10:57 -0500, m.r...@5-cent.us wrote:

> > Here too and from my own systems those 'scriptkiddies' are exposed to the
> > world using http://twitter.com/fail2ban :)
> 
> So, where's most of your hits from? The most I see is China, followed by
> Brazil, then Korea (not sure which), then, a lot lower, Russia, Italy, and
> various others.
Lots from China, Russia and some South American countries. Sometimes
even from my own country ! (Netherlands).

Regards,

Michel

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Re: [CentOS] SSH Automatic Log-on Failure - Centos 5.5

[Michel van Deventer]

>>
>>> Security through obscurity doesn't work.
>>
>> It certainly helps defeat most potential intruders but not the most
>> determined.  IPtables does help too.
>
> We also run fail2ban at work. Very nice, installs (along with shorewall),
> and creates a temporary blacklist, blocking an IP that's tried five, I
> think, times to break in. All configurable, btw.
Here too and from my own systems those 'scriptkiddies' are exposed to the
world using http://twitter.com/fail2ban :)

 Regards,

 Michel


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Re: [CentOS] tar-ing subdirectories separately

[Michel van Deventer]

Hi,

> I want to backup a directory using tar, but want separate tarballs for
> each subdirectory. For example: 
> # ls dir1
> subdir1 subdir2 subdir3
> 
> 
> Will it possible to do it using only tar command? Or will I need
> another separate piece of logic/control? I thought of writing a shell
> script with three tar commands for each subdirectory, but that's not
> elegant way of doing it. Also, it may not scale as number of
> subdirectories change. Any other solutions or tips for doing this will
> be really helpful. 
You can try something like :
find /dir1 -type d -print -maxdepth 0 | while read DIR ; do tar cfv
$DIR.tar $DIR/; done

not tested, just off the top of my head and it's late, so if it breaks,
you can keep and be happy with all the pieces ;)

Regards,

Michel




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Re: [CentOS] how to convert 7 cd iso images into one dvd image?

[Michel van Deventer]

Hi,


On Sat, 2011-01-15 at 12:37 +, Keith Roberts wrote:
> >>> So, is there a technique or an open source tool that 
> >>> will create a dvd iso given the cd iso images?
> >> I've seen the DVD ISO files on select mirrors.  it can be 
> >> difficult to reliably transfer a> 4GB file over http/ftp
> 
> I've only had one DVD iso dowload corrupted over http.
> 
> I use a fast mirror and d/l overnight with a wget bash 
> script, run by cron.
I have downloaded hundreds of DVD iso images with wget and curl during
the past years. I had maybe one or two that were corrupted in one way or
another, mostly because of improperly configured (windows) webservers.
>4Gb with HTTP is no problem nowadays, FTP isn't either.
If you have doubts about HTTP/FTP you can always use the Bittorrent way
to download (also with commandline tools like btdownloadcurses or
similar). It doesn't really matter when you download them although in
some cases it can make a difference in speed to download overnight but
with most tools you can also specify a maximum bandwith to use.

To be sure an image is ok you can always check the image with the
md5/sha1 checksum which is normally found in the same directory as the
image on the HTTP/FTP server.

kind regards,

Michel


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Re: [CentOS] Routing issue between 2 LANs

[Michel van Deventer]

Hi,

> >>> The Fedora box (1. network):
> >>> [j...@idi ~]$ ping 192.168.236.80
> >>> PING 192.168.236.80 (192.168.236.80) 56(84) bytes of data.
> >>> 64 bytes from 192.168.236.80: icmp_req=1 ttl=64 time=1.61 ms
> >>> 64 bytes from 192.168.236.80: icmp_req=2 ttl=64 time=0.684 ms
> >>> [j...@idi ~]$ ifconfig eth0 | grep -i 'inet addr'
> >>>inet addr:192.168.1.3  Bcast:192.168.1.255  Mask:255.255.255.0
> >>
> >> This doesn't make much sense without a route.  Can you try a traceroute to 
> >> the
> >> fedora box address from the 192.168.236.80 box to see how/why it gets 
> >> there?
> >
> > Sure, here it is:
> >
> >> From fresh reboot of the Fedora14 box:
> >
> > [j...@idi ~]$ su -
> > Contraseña:
> > [r...@idi ~]# route add -net 192.168.236.0 netmask 255.255.255.0 gw 
> > 192.168.1.100 dev eth0
> > [r...@idi ~]# logout
> >
> > [j...@idi ~]$ traceroute 192.168.236.80
> > traceroute to 192.168.236.80 (192.168.236.80), 30 hops max, 60 byte packets
> >   1  puente (192.168.1.100)  0.286 ms  0.260 ms  0.239 ms
> >   2  192.168.236.80 (192.168.236.80)  0.963 ms !X  0.949 ms !X  0.930 ms !X
> 
> We know why it works this direction.
> 
> > [j...@idi ~]$ ping 192.168.236.80
> > PING 192.168.236.80 (192.168.236.80) 56(84) bytes of data.
> > 64 bytes from 192.168.236.80: icmp_req=1 ttl=64 time=0.668 ms
> > 64 bytes from 192.168.236.80: icmp_req=2 ttl=64 time=0.599 ms
> > 64 bytes from 192.168.236.80: icmp_req=3 ttl=64 time=0.566 ms
> > ^C
> > --- 192.168.236.80 ping statistics ---
> > 3 packets transmitted, 3 received, 0% packet loss, time 2000ms
> > rtt min/avg/max/mdev = 0.566/0.611/0.668/0.042 ms
> >
> > [j...@idi ~]$ ssh 192.168.236.80
> > j...@192.168.236.80's password:
> > Last login: Sun Dec 19 20:44:44 2010 from 192.168.1.3
> > [j...@control ~]$
> 
> I wanted the reverse path.  Traceroute from the 192.168.236.80 box back to 
> the 
> fedora address.  It doesn't make sense that it can return packets without a 
> route going through the Centos box.
Yes it does make sense, if the machine in the 192.168.236.0/24 has the
centos box in the middle (the one with two LAN cards) as a default
route, then you wouldn't need a seperate route. Packets would come back.
Can you give the network settings for 192.168.236.80 ?

Can you tell us more about the network setup ? routers in both
networks ? Maybe a quick drawing should make things more clear.

If you cannot set a route on the various devices it might help to use
proxy-arp.

regards,

Michel



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Re: [CentOS] IPV4 is nearly depleted, are you ready for IPV6?

[Michel van Deventer]

Hi,

On Sun, 2010-12-05 at 13:50 +0200, Rudi Ahlers wrote:
> Seeing as IPV4 is near it's end of life
> (http://www.internetnews.com/infra/article.php/3915471/IPv4+Nearing+Final+Days.htm),
> I'm curios as who know whether everyone is ready for the changeover to
> IPV6?
> 
> Is anyone using it in production already, and what are your experiences with 
> it?
> 
I have a dualstack (IPV4/IPV6) ADSL connection at home and all my
machines are IPV6 connected, some in combination with IPV4, but I have a
few IPV6 only machines. My mail and some websites are adressable with
IPV6.

Is this really production ? Well, sort of :)

Regards,

Michel



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Re: [CentOS] SMS Gateway

[Michel van Deventer]

Hi,

On Thu, 2010-11-18 at 10:07 +0100, Jakub Jedelsky wrote:
> Hi list-people!
> 
> Is there anybody who has expiriences with sms gateway on Centos? Our
> customer has a Siemens modem (connected via serial port) and finds any
> tool for sending and receving sms. I found something like gammu and
> smstools but I'm not sure with it.. Have you any tips?
I use smstools on CentOS and RHEL with Siemens SMS modems, Nokia GSM
(7110), Siemens GSM (M35) and GPRS modems. Works like a charm and very
easy to use.
You can use scripts to act on incoming SMS too.

You can send SMS from the command line or by putting a file with the
right content in the outgoing directory of the daemon.

regards,

Michel




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Re: [CentOS] what are these gstreamer codecs

[Michel van Deventer]

> i have problem with localhost in my mandriva server
> i use proxy
Could you PLEASE use the mandriva maillist ??
This is a CENTOS maillist.

Regards,

   Michel


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Re: [CentOS] should vsftpd be disabled in favour of sftp for security reasons?

[Michel van Deventer]

>
>   (another in an ongoing list of things i just want to clarify for the
> sake of future courses taught on centos.)
>
>   from this RHEL doc page:
>
> http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Deployment_Guide/s1-openssh-server-config.html
>
> the reader is advised to, for the sake of security, remove/disable
vsftpd, ostensibly in favour of sftp/sftp-server.  really?
>
>   i can obviously see disallowing stuff like telnet and rsh and
> rlogin, that's a no-brainer.  but advising against vsftpd for the sake
of security?  i'm not sure i see the logic in that.  thoughts?
As FTP is a clear-text protocol, I would surely advise against leaving it
on :)
I only run a vsftpd server on one of my machines for the customers
comfort, but that will change in the near future !

I can easily image scenarios where unencrypted traffic with
usernames/passwords is disallowed.

Regards,

 Michel




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Re: [CentOS] looking for cool, post-install things to do on a centos 5.5 system

[Michel van Deventer]

Hi,

>
>>
>> On Fri, 2010-09-17 at 03:39 -0400, Robert P. J. Day wrote:
>> > other ideas?
>>
Maybe a crash course in troubleshooting using the rescue CD ?

I don't know exactly which subjects are covered in your course ? Can you
be more precise ? :)

   regards,

   Michel




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Re: [CentOS] slightly OT: dban

[Michel van Deventer]

Hi,

>   On 27/08/2010 15:19, m.r...@5-cent.us wrote:
>> I'm trying to nuke a Dell Optiplex GX620. I've got a perfectly good dban
>> 1.0.4 that I've used a bunch of times... but on this machine, it says
>> starting, then dies, saying "dban has finished with non-fatal errors.
>> Check the log for more information" It never gets to the interactive
>> menu.
>>
>> Now that I've disabled the non-existant floppy drive, at least it does
>> say
>> "to save the log file again, press enter"
> I usually use dban but if it's not handy use a liveCD (me usually
> Ubuntu) and use dd:
>
> Assuming the drive to kill is /dev/sda:
> dd if=/dev/random of=/dev/sda
>
> Do it a few times for good measure. At work we have a policy of
> physically destroying
> drives which grates a little at times.
I use shred from a rescue CD (Centos/RHEL/Fedora/Ubuntu).
shred -vz -n3 /dev/sda clears the disk nicely (takes some tim though :) )

regards,

Michel


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Re: [CentOS] Ethernet Quad

[Michel van Deventer]

> On 08/12/2010 06:06 AM, Rudi Ahlers wrote:
>> On Thu, Aug 12, 2010 at 3:01 PM, Jerry Franz  wrote:
>>
>>> On 08/12/2010 05:56 AM, Daniel Bruno wrote:
>>>
 Someone can indicate some Ethernet device Quad 10/100 to use with
 CentOS 5.x
>>> I don't know about 10/100. For 10/100/1000 I use Intel quad port
>>> boards.
>>> They work fine.
>>>
>>
>>
>> Sorry to hijack this thread, but it could be relevant.
>> As matter of interest, do these cards offer lower throughput than 4x
>> single 1GB cards?
If you should use them in a PCI slot yes, not if you use them in a PCI-X
or PCI-e slot (although you could saturate a PCI-e x1 with 4 gbit ports I
think).

>>
>>
>
> Depends mostly on if you are using PCI/PCI-X vs PCI-express. At high bit
> rates you can saturate the old PCI bus. A single gigabit port can pretty
> much saturate a 32-bit PCI bus at 33MHz.
>
> PCI-express can go a lot faster.
The Intel Quad cards don't fit (and don't then) in a single PCI slot.
The Intel Dual Gbit cards do and you can saturate a PCI slot with it quite
easy :)

   Regards,

   Michel

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Re: [CentOS] need help: about remove space

[Michel van Deventer]

Hi,

On Fri, 2010-04-30 at 07:46 -0700, adrian kok wrote:
> Hi all
> 
> I have big file as below 
> and would like to know how many line eg: wc -l file
> but can't figure out how to know
> 
> If I type wc -l file, I only get the 1023 but it includes the space 
> When I use cat file | tr -d "\r \n". it gives me "adrian alice.."
> I need it as fileB and then wc -l fileB.
> 
If those lines between the names are empty lines you might try :
cat bigfile | egrep -v '^$' | wc -l

or if you want the names into a second file :
cat bigfile | egrep -v '^$' > fileB

Regards,

Michel



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Re: [CentOS] Using Wireshark on CentOS without UI

[Michel van Deventer]

Hi,

> Yesterday i had installed wireshark on my centos box which does not have
> the GUI , It is actually a hardened box. I installed the tool using the
> following command:
>
> yum install wireshark
>
> After installation i dont know how to proceed further in capturing the
> packets. I basically want to capture packets and copy them onto my
> windows box. On the windows box i can use the Wireshark UI to open the
> pcap file to view its contents.
Wireshark in cli mode is called tshark.

With 'tshark -i eth0 -w outfile' captures all traffic on eth0 to outfile.

  Regards,


  Michel



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Re: [CentOS] RHEL 6 Beta available for public download

[Michel van Deventer]

And now it works :) happy downloading ;)

> Hi
>
> The /rhel/ directory in the link on the redhat pages
> (ftp://ftp.redhat.com/pub/redhat/rhel/beta/6/) turns out to be a /.rhel/
> directory, hope they will fix it soon.. until then a script is monitoring
> the ftp server ;)
> Also the release notes give a 404.
>
>regards,
>
>Michel
>
>>
>>
>>
>>>
>>> http://press.redhat.com/2010/04/21/red-hat-enterprise-linux-6-beta-available-today-for-public-download/
>>>
>>> ...says it all.
>>>
>>> Have phun!
>>>
>>> Timo
>>
>> Hmmm.  I get a 505.
>>
>> B.J.
>>
>> CentOS 5.4, Linux 2.6.18-164.15.1.el5 x86_64 07:55:04 up 1 day, 22:25, 1
>> user, load average: 0.09, 0.14, 0.16
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Re: [CentOS] RHEL 6 Beta available for public download

[Michel van Deventer]

Hi

The /rhel/ directory in the link on the redhat pages
(ftp://ftp.redhat.com/pub/redhat/rhel/beta/6/) turns out to be a /.rhel/
directory, hope they will fix it soon.. until then a script is monitoring
the ftp server ;)
Also the release notes give a 404.

   regards,

   Michel

>
>
>
>>
>> http://press.redhat.com/2010/04/21/red-hat-enterprise-linux-6-beta-available-today-for-public-download/
>>
>> ...says it all.
>>
>> Have phun!
>>
>> Timo
>
> Hmmm.  I get a 505.
>
> B.J.
>
> CentOS 5.4, Linux 2.6.18-164.15.1.el5 x86_64 07:55:04 up 1 day, 22:25, 1
> user, load average: 0.09, 0.14, 0.16
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Re: [CentOS] release

[Michel van Deventer]

Hi,

On Sun, 2010-03-21 at 19:30 +0100, mattias wrote:
> [r...@vps ~]# rpm -qi centos-release
> 
> Name: centos-release   Relocations: (not relocatable)
> 
> Version : 5 Vendor: CentOS
> 
> Release : 4.el5.centos.1Build Date: tor  1 okt 2009
> 14.28.40
> Install Date: sön 21 mar 2010 14.20.07Build Host:
> builder16.centos.org  
> Group   : System Environment/Base   Source RPM:
> centos-release-5-4.el5.c
> entos.1.src.rpm
> 
> Size: 35485License: GPL
> 
> Signature   : DSA/SHA1, tor  1 okt 2009 14.41.26, Key ID a8a447dce8562897
> 
> Summary : CentOS release file
> 
> Description :
> 
> CentOS release files
> 
> [r...@vps ~]#
So it's Centos 5.4, a cat /etc/redhat-release should confirm it ;)

Regards,

Michel


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Re: [CentOS] Motherboards for HPC applications

[Michel van Deventer]

Hi,

> 5400 series CPU).  I have an Asus board that runs Linux and
> Opensolaris just fine, but will not allow any version of Windows to
> install.
I want one of those :) 

Regards,

Michel


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Re: [CentOS] how to open a tcp port?

[Michel van Deventer]

Hi,

> Greetings,
>
> On Wed, Mar 3, 2010 at 6:20 PM, Rajagopal Swaminathan
>  wrote:
>> Greetings,
>>
>> On Wed, Mar 3, 2010 at 6:10 PM, hadi motamedi 
>> wrote:
>
>> is telnetd installed?
>>
> # yum install telnet-server telnet
>
>
>> is the telnet deamon running on machine #1?
>>
> chkconfig telnet on
>
> or
> from:
> http://www.cyberciti.biz/faq/how-do-i-turn-on-telnet-service-on-for-a-linuxfreebsd-system/
>
> [quote]
> The configuration file for telnet is /etc/xinetd.d/telnet. To enable
> telnet server you need to open this file and make sure disable = no
> read as disable = yes.
> [unquote]
>
> service xinetd restart
> or
> /etc/init.d/xinetd restart
>
Why are you telling him to install a telnetd ??
He's trying to connect to a port using telnet (client) to see if a server
is listening on it.

I doubt by the way if a missing package is the issue.
Please check first if there is a server listening on tcp 4965
netstat -ltpn | grep 4965

the output should show you which application is listening on tcp/4965
if there no output, there's nothing listening and you should fix your
application first (maybe it's not started ?).

If there's something listening on tcp/4965 you can try to use
telnet localhost 4965

to see if you can connect
or use
telnet ip.nu.mb.er 4965

if the application is only listening on a single ip.
use
iptables -L -vnx | grep 4965
to see if theres a firewall rule blocking it (or accepting) if you have
the firewall active (do you?)

Please let us knwo the outcome of these commands

Regards,

Michel


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Re: [CentOS] Temperature sensor

[Michel van Deventer]

On Fri, 2010-02-26 at 18:34 +0200, Eero Volotinen wrote:
> > You can make it really cheap if you have some soldering skills ;)
> 
> what is solution for people without soldering skills? ;)

Learn it or find someone who can OR if all else fails, buy complete
products :)

Regards,

Michel



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Re: [CentOS] Temperature sensor

[Michel van Deventer]

Hi,

On Fri, 2010-02-26 at 17:18 +0100, Dominik Zyla wrote:
> On Fri, Feb 26, 2010 at 08:13:56AM -0800, Benjamin Franz wrote:
> > Bowie Bailey wrote:
> > > Does anyone know of a cheap temperature sensor that will work with
> > > Linux?  I don't need a fancy monitoring appliance, I just want a simple
> > > sensor that I can connect to one of my monitoring servers to let me know
> > > if the server room is getting hot
> > There is a good chance that lm-sensors supports your servers with no 
> > additional hardware needed. To configure lm-sensors, run 
> > 'sensors-detect' as root. If your cpu/motherboard is supported you will 
> > be able to read system temps directly either using SNMP or by scraping 
> > 'sensors' output.
> 
> But it'll not give information about temperature in server room.
I use 1-wire devices with CentOS.
See http://owfs.org/ 
If you google a bit there are many suppliers who sell complete kits for
serial and USB (I use USB) connections for a fair price.
Maybe it's a bit overkill for 1 sensor, but its easy to connect many
sensors to a machine (I have about 20 :) ).

You can make it really cheap if you have some soldering skills ;)

Regards,

Michel



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Re: [CentOS] one server handled sendmail added two more servers messes things up

[Michel van Deventer]

Hi,


> All three machines have the same FQDN.
> something like A.mydomain.com, B.mydomain.com, C.mydomain.com
No, they don't have the same fqdn, the fqdn includes the hostname.

> 
> The IP numbers are X.Y.Z.170, .171 and .172
> 
> All three machines have MX records. they all have the same domain name.
There's your error, the new one shouldn't have mx records for the domain
if they are not designed to accept mail for that domain.

> 
> It is a big deal to request changes from the provider so I was hoping 
> there was a way
> to just tell the two new machines that incoming email to them just send 
> on over to the the
> first machine.
> 
> Is there a way to do that - or am I going about this the wrong way?
There is a way but maybe there's a quicker (and dirtier) way. Just
reconfigure sendmail on the two new machines to *not* listen on the
public ip on the smtp port. Otherwise block port tcp/25 with iptables
(iptables -I INPUT -j REJECT -p tcp --dport 25)
But you should really get your DNS fixed.

regards,

Michel


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Re: [CentOS] RHCE

[Michel van Deventer]

On Tue, 2009-12-29 at 12:06 -0600, Dan Burkland wrote:
> I realize this is a CentOS mailing list but because it is based
> directly on RHEL, I would assume there are a few individuals who
> frequent the list that have passed the RHCE exam. I plan on taking the
> exam this March and was wondering if there are any tips you RHCEs out
> there could provide that may help me.
Well, there's at least one RHCE (and RHCA) on this list :)
But we (and you when you take the exam) are not allowed to talk about
it. If you haven't booked it yet, try to get the 'rapid track' course
with exam, it takes you through the whole system and gets you up to
speed on a lot of subjects you might not be using everyday (I do not
know what you are doing for a job, but I can imagine that you don't use
every aspect of RHEL (or CentOS) on a daily basis).
If you are VERY experienced you can try to take the exam without
preparation, it is performance based as Red Hat calls it. See
http://www.redhat.com/certification/rhce/ for more information and some
prep questions.

Regards,

Michel (RHCE #804006422520400)




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Re: [CentOS] rhn_register

[Michel van Deventer]

On Sat, 2009-12-26 at 07:38 -0800, Drew wrote:
> > Is this available on CentOS systems?
> > If so, what advantage does running it provide?
> 
> As far as I know, that package is used to register your server with
> RedHat as part of the RedHat Network subscription system to get their
> updates.
> 
> On a CentOS box it's pretty much pointless.
Unless you're using Spacewalk, the open source version op RHN, in which
case, it's very useful :)

I have all (ahum 10) my machines connected to a virtual server running
spacewalk.

Regards,

Michel


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Re: [CentOS] Old hd, new machine

[Michel van Deventer]

Hi,

> What should I do to make an existing CentOS (5.4) disc boot up on a new
> computer?
>
> I just made on CentOS 5.3 installation on that machine, so I know the
> hardware is compatible.
>
> Would it be enough to boot with a DVD in rescue mode, or boot with
> another hd, and install grub?
You might try to boot with the old hd right away. I did almost the same
last weekend. Installed a new system for a friend on a virtual machine
(using qemu) using a new disk and put the disk in his (old) machine (the
machine wasn't available to me at the time of install) after installation.

If it doesn't boot (normally because the disk numbering is different) you
can use a rescue DVD and grub to fix things (probably grub-install and
maybe /etc/fstab for the /boot filesystem).
Is the old hd using LVM and/or labels for filesystems ?

Regards,

Michel


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Re: [CentOS] Cron job? or something else? help..

[Michel van Deventer]

Hi,

On Mon, 2009-12-14 at 08:51 +0100, Michel van Deventer wrote:
> Hi,
> 
> On Mon, 2009-12-14 at 09:46 +0200, Roland Roland wrote:
> > Hello,
> > 
> > i have a certain issue at hand that i'm trying to solve.
> > 
> > there's a certain command that i need to execute 10 minutes after boot.
> > how can i set that? im not very expert with cron jobs but can it be done 
> > that way? i know that cronjob works on specified time but how can i set 
> > it to run with '10 min after startup" as a condition ?
> There's no such option in cron. But the easiest way to do this is to put
> it in /etc/rc.d/rc.local like this :
> 
> sleep 600 && 
> 
> this waits 600 seconds and (if succesfully) executes your command
And (of course) slows down bootup :) Better put the sleep 600 in your script 
and start the script detached from /etc/rc.d/rc.local (with an & )

Regards,

Michel


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Re: [CentOS] Cron job? or something else? help..

[Michel van Deventer]

Hi,

On Mon, 2009-12-14 at 09:46 +0200, Roland Roland wrote:
> Hello,
> 
> i have a certain issue at hand that i'm trying to solve.
> 
> there's a certain command that i need to execute 10 minutes after boot.
> how can i set that? im not very expert with cron jobs but can it be done 
> that way? i know that cronjob works on specified time but how can i set 
> it to run with '10 min after startup" as a condition ?
There's no such option in cron. But the easiest way to do this is to put
it in /etc/rc.d/rc.local like this :

sleep 600 && 

this waits 600 seconds and (if succesfully) executes your command

Regards,

Michel


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Re: [CentOS] bsd mkfile command in centos - a wish

[Michel van Deventer]

Hi,

On Mon, 2009-10-05 at 11:14 -0700, aurfal...@gmail.com wrote:
> Hi Les,
> 
> Yes, I do run dd to create Xen image files but was hoping to use a  
> more elegant solution.
> 
> Looks like I'll continue with dd but if any one else has some secrets,  
> please share.
qemu-img create -f   [size] is more elegant :)

    Kind Regards,

    Michel van Deventer



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Re: [CentOS] sshd options - centos 5.3

[Michel van Deventer]

Hi,

> > On Tue, 2009-09-22 at 11:01 -0700, Karl Kobata wrote:
> > > I have installed cento 5.3.  I enabled the ssh deamon.  I have found
> > > that 2 options that I normally use does respond as I expect.  Has
> > > anyone else had similar problems with the following options in
> > > sshd_config:
> > > 
> > > - Port  – if I set the port to anything other than 22 (default),
> > > using ssh –p name at servername, does not work.  Yet if I leave keep
> > > the default, then ssh name at servername allows me to login.
> > Did you check your iptables rules ? port  is closed by default. I
> > use a sshd with port 443, so it should work.
> Was this the only change you made to change the port?  
Yes the only change to change the port in the SSHD.

> Did you also makes changes in iptables?
Of course : iptables -I RH-Firewall-1-INPUT -j ACCEPT -p tcp --dport

and after that to make it persistent : service iptables save

for more options : man iptables (which you should read before playing
with firewalls).

> > > - PasswordAuthentication no – if I set this option to “no” (default is
> > > “yes”), and my ssh key is either missing or in error, I will be
> > > prompted for user system login password.  If this is set to “no”, it
> > > should not allow me to login if I have not ssh key specified or in
> > > error.  Has anyone else run into this problem.
> > Erhm.. I remember it does ask for a password but just doesn't let you
> > in. But I can me mistaken :)
> It does ask you for a password, and if you entered your user system password,
> It will log you in.  I am surprised that this failure exists.
I think its not a failure ;)

Regards,

Michel


> 

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Re: [CentOS] sshd options - centos 5.3

[Michel van Deventer]

Hi,

On Tue, 2009-09-22 at 11:01 -0700, Karl Kobata wrote:
> I have installed cento 5.3.  I enabled the ssh deamon.  I have found
> that 2 options that I normally use does respond as I expect.  Has
> anyone else had similar problems with the following options in
> sshd_config:
> 
> - Port  – if I set the port to anything other than 22 (default),
> using ssh –p n...@servername, does not work.  Yet if I leave keep
> the default, then ssh n...@servername allows me to login.
Did you check your iptables rules ? port  is closed by default. I
use a sshd with port 443, so it should work.

> 
> - PasswordAuthentication no – if I set this option to “no” (default is
> “yes”), and my ssh key is either missing or in error, I will be
> prompted for user system login password.  If this is set to “no”, it
> should not allow me to login if I have not ssh key specified or in
> error.  Has anyone else run into this problem.
Erhm.. I remember it does ask for a password but just doesn't let you
in. But I can me mistaken :)

Regards,

Michel


> 

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Re: [CentOS] Simple resource manager?

[Michel van Deventer]

Hi,

have a look at Torque
(http://www.clusterresources.com/products/torque-resource-manager.php)

It might be a bit overkill, but it might also suit your needs :)

Regards,

Michel


On Mon, 2009-07-27 at 15:22 -0300, Eduardo Grosclaude wrote:
> I need to serialize computing job requests for two different multicore
> machines, and in some near future, for a cluster. I have worked with
> SGE but it requires NFS and other administrative steps, plus it seems
> a bit overkill for my needs. I guess some simpler queue managing
> engine may have been developed, possibly over SSH. Any pointers? TIA.


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Re: [CentOS] company exchange server & exim best practices.

[Michel van Deventer]

Hi,

my solution to this kind of problem is the following :
Set up a relay mailserver (in my case Postfix) which accepts mail (and
has the MX record for the domain) for the domain but has no mailboxes.
Postfix takes care of spamblocking (dnsbl and spamfilter ). In Postfix I
use a transport table to relay the mail to the Exchange/Whatever
mailserver, that can also be on a nonstandard port (in my case port
2525).
Delivering to a dyndns host is really easy, Dyndns uses a short ttl for
the hostname (something like 3 minutes ?). I set up a nameserver record
which let a 'fixed' name (like mail.domain.nl) point to the dyndns name
using CNAME.
mail.domain.nl. IN CNAME mailhost.dyndns.org

Sending the mail to the dyndns hostname directly without the nameserver
trick is also possible. 

Using a non-standard port is to bypass SMTP limits from the provider and
to make (almost) sure your mail doesn't get delivered to a mailserver of
someone else ;)

Regards,

Michel


On Fri, 2009-04-03 at 09:40 +0200, Rudi Ahlers wrote:
> Hi all,
> 
> I hope this isn't too OT, but since I use a CentOS5.2 + Exim mail
> server (which is hosted in one of our data centres) I don't think it
> should be.
> 
> On of our clients use an MS Exchange 2003 SBS server, with exchange
> for their internal email. We provide them with a domain, ADSL (which
> uses dynamic DNS) and POP3 email. They don't have an spam filter
> program on the exchange server itself due to costs, so I have setup
> each user on the Exim server, which runs ASSPX for anti-virus / spam
> filter / etc. Then I setup the SBS 2003 server to pull the email via
> POP3, but this doesn't seem to work too well, cause the exchange
> server doesn't always download the POP3 email, and then the users
> often sit without email until I go there to manually download the mail
> again.
> 
> I have tried changing the MX record to point to their DynDNS address,
> and it works well, but then they get a lot of spam. And the cost of a
> server-side spam solution is just too expensive, and they also pay for
> the bandwidth uses when spam comes in. So, I moved their MX record
> back to the Linux server. But now I sit with the problem of the POP3
> connector failing from time to time.
> 
> So, I would like to know, is there a way to "push" (not forward) mail
> from the Linux server, after it has arrived and spam been blocked, to
> another domain, but with the same email address? i.e. the domain in
> question is attorneys.co.za and I've setup attorneys.dyndns.net as the
> dynamic domain, but the exchange serves email for attorneys.co.za
> Forwarding email doesn't work, since there's no such user as
> b...@attorneys.dyndns.net, but rather b...@attorneys.co.za.
> 

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Re: [CentOS] pop3 attack

[Michel van Deventer]

Hi,

> RR charges you an extra $50/mo for static ip! I don't have many other
> choices for a decent high speed connection. DSL is too slow in my area. 
We have some ISP's here in the Netherlands which have spam relayed
through their mailservers, which gives the same problem, blacklisted
smarthosts of big ISPs.
One way to get around it is to get yourself a VPS (virtual private
server) for a small amount ($20/month?) and set up your own
'smarthost' (maybe together with some friends/coworkers?). You can then
even use a non-standard port to relay your mail through it and even
encrypt if you wish. 
I have my smarthost set up at such a server because my laptop goes
around different networks and isps and I don't want to change my
configuration every time :)

regards,

Michel



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RE: [CentOS] CentOS on Dell Poweredge 2850

[Michel van Deventer]

Hi,

On Wed, 2008-09-17 at 10:26 +0200, [EMAIL PROTECTED] wrote:
> Ian Forde <> scribbled on Tuesday, September 16, 2008 8:35 PM:
> 
> >> Our department's planning to buy a refurbished Dell Poweredge 2850 running
> >> dual-xeons and with a rather big raid array (8x 146GB).
> >> 
> >> *My* plan is to install CentOS on this machine and I'd like to hear with
> >> you guys if there are any gotchas' doing this.
> >> 
> >> My main concern is the ability of CentOS to recognise the raid-controller
> >> of the Dell and run a raid5-array as well as drivers for the onboard NICs.
> >> 
> >> Any feedback on this is appreciated.
> > 
> > I don't forsee any problems.  I'm running CentOS 5.2 on a 2950 III and
> > omreport installs fine without any problems.  I can see the RAID array
> > and monitor via the Nagios omreport plugins (search nagios-exchange for
> > them).  Onboard NICs shouldn't be a problem either...
> 
> Thx. A former unix-admin at the dept thinks it might be a little on the old
> side hardware-wise, this particular server is about four years old. I'm
> split...
> 
> This particular Poweredge modell is certified for RHEL 2 and 3. If I'd try to
> install RHEL5 on it, would bad things happen, or is it just a support issue?
> Seeing how CentOS 5.2 is equivalent to RHEL5, I don't see *what* could happen
> though... Kernel panics??
I'm running RHEL5 and CentOS 5 on many PE 2850's. As long as you use the
Dell PERC4 or PERC5 controllers all will work well. Onboard NICs work
fine too.

Regards,

Michel



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Re: [CentOS] problem with slave dns servers

[Michel van Deventer]

Hi,

what is the TTL of your DNS records ? After TTL expires, the slaves
don't respond to queries either, because the records aren't valid
anymore. If your primary is down longer than the TTL of your DNS records
you could reconfigure one of the slaves as a new primary or maybe
consider making more than 1 primary.

On Thu, 2008-08-28 at 09:01 +0200, Romeo Ninov wrote:
> Have you describe all the slave servers in you domain configuration (in 
> registrant)?
> 
> Mark Quitoriano  wrote / napísal(a):
> > Hi,
> >
> > I have 4 bind9 dns installed on centos 4. My primary dns server went 
> > down and all of my domains doesn't resolve even if the 3 slave dns is 
> > up and running. Im not sure where to configure this is it in my domain 
> > registration or in bind?
> >
> >
> > -- 

Regards,

Michel


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Re: [CentOS] data rate on NIC card

[Michel van Deventer]

On Tue, 2008-08-26 at 11:20 +0530, Gopinath Achari wrote:
> hi 
> 
> 
> how to check the data rate on the nic card in centos
> i.e, at what speed the data is transmitted and received on
> ethernet interface in terms of kbps or bps
> any command is available in centos 5.1
You can use ethtool  to check for negotiated networkspeeds.
If you want to check for current speeds of network connections, I
usually use iptraf.

Regards,

Michel



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Re: [CentOS] centos on intel D945GCLF board

[Michel van Deventer]

Hi,

I use the same board for my backupserver. I just added a gigabit Intel
card to the board (on the pci bus) and all went well. No more issues
with realtek hardware.


On Tue, 2008-08-19 at 07:20 -0700, ABBAS KHAN wrote:
> Is this the kernel module used for the LAN card driver?
> 
> r8169
> 
> 
> 
> 
> 
> On Tue, Aug 19, 2008 at 7:11 AM, Janez Košmrlj <[EMAIL PROTECTED]>
> wrote:
> I tried kernel-2.6.18-92.1.10.el5.x86_64.
> I know of the driver on the Intel page, but I would like a
> system that works out of the box. So I can update it any time,
> since this system will be a router and it will be connected to
> the internet 24/7.
> 
> 
> 
> 
>   
> 
> ABBAS KHAN wrote:
> Here is the driver, provided for Intel for the board.
> 
> 
> http://downloadcenter.intel.com/Detail_Desc.aspx?ProductID=2916&DwnldID=16242&lang=eng
>  
> 
> 
> 
> You can compile it and give it a try as a last resort,
> if everything else fails.
> Could you please tell the version of kernal you're
> using?
> A simple search showed that this LAN card has a lot of
> issues with kernal.
> 
> Thanks.
> 
> 
> 
> 
> 
> 
> On Tue, Aug 19, 2008 at 6:38 AM, Janez Košmrlj
> <[EMAIL PROTECTED] >
> wrote:
> 
>I know that disabling the LAN in BIOS works. The
> problem is that I
>need the on-board card, since I am trying to build
> a home router
>and I need 2 LAN cards for that. And the board has
> only one PCI slot.
> 
>ABBAS KHAN wrote:
> 
>I've Intel DG31PR with almost same Realtek
> chipset. Disabling
>/ enabling on board LAN from the BIOS works
> flawlessly.
>You can make sure if the board is certified at
>hardware.redhat.com
> 
>.
> 
>I guess to test kernal you can use CentOS Live
> CD and the
>dmesg tool as well.
> 
>Good luck!
> 
> 
> 
>On Tue, Aug 19, 2008 at 6:22 AM, Janez Košmrlj
><[EMAIL PROTECTED]
> 
> 
> >>
> 
>wrote:
> 
>   Hi,
>   I am trying to install centos on the intel
> D945GCLF board.
>It's a
>   mini-ITX board with the atom processor and
> it uses the Realtek
>   RTL8102EL LAN chipset. When I disable the
> on-board LAN card it
>   installs  and runs OK, but when I enable it,
> I get kernel
>panic at
>   boot.
>   The board runs perfectlj with Fedora 9 (with
> the latest
>kernel) or
>   with Ubuntu server.
> 
>   My question is: is there some way to run
> centos on this board
>   (test kernel, i can try for example)?
> 
> 
> 
> ___
>   CentOS mailing list
>   CentOS@centos.org 
> 
> >
> 
> 
> 
> http://lists.centos.org/mailman/listinfo/centos
> 
> 
> 
>  
> 
> 
> 
> 
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> 

Re: [CentOS] I'm Stuck

[Michel van Deventer]

Hi,

On Wed, 2008-08-06 at 11:36 -0500, Bob Smither wrote:
> Dear List,
> 
> I have an older Sony Vaio that I would like to install CentOS on.  The
> unit has a USB CD that can _not_ be used as a boot device (the Sony one
> could, but mine is an aftermarket CD and can't be used to boot).  It
> does have a floppy drive that it can boot from.
> 
> The only network install method for CentOS that I can find uses a CD,
> not a floppy.
> 
> Is there anyway to get CentOS on this machine?
Can you boot from USB stick? You then could use the Live CD, converted
to USB or use another bootable linux on it. As long as you have a
bootable partition where you can put a vmlinuz, initrd.img and grub,
you're in business.

regards,

Michel



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Re: [CentOS] command line configuration of DSL access

[Michel van Deventer]

Hi,

On Fri, 2008-07-11 at 12:13 +0200, Gergely Buday wrote:
> Hi there,
> 
> how can I configure a DSL access using the command line? The Red Hat
> Certified Engineer Linux Study Guide does not describe this and I
> could not find any description on the internet.
Maybe you can provide us with some more information, as like which
provider are you using in which country, what kind of hardware are you
using to connect to DSL (router/pci card?), which version of CentOS are
you using and maybe other info that might be of use ?

kind regards,

Michel



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Re: [CentOS] EPIA-M board for Centos

[Michel van Deventer]

On Tue, 2008-07-01 at 15:27 +0100, Karanbir Singh wrote:
> Robert Moskowitz wrote:
> > Is there any problems using this board?
> >
> > I have a dead board in a Book-PC (board size 10.5"x6") so am looking for
> > a new board.
> >
> 
> if you are going to use centos-5 make sure you get a cpu that works with 
> it :D ( there is no i586 support in centos-5 )
My backupserver is an EPIA-M1, runs CentOS 5 perfectly. I thought
all Via Epia's 1Ghz and up speak i686 :) But you might want to Google to
be sure.

Regards,

Michel


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Re: [CentOS] INIT 5 and system is gone

[Michel van Deventer]

Hi,

On Mon, 2008-06-30 at 10:33 -0400, Robert Moskowitz wrote:
> I had been running a system on Centos 5.1 at INIT 3.  I did the upgrade 
> to Centos 5.2 with the aid of the powernowk8 patch.
> 
> Previously I would VNC into the unit when I needed to do admin stuff 
> with a GUI.  Well I noticed that I was NOT getting GNOME via VNC since 
> the upgrade (worked before just fine with 5.1).  So I tried an INIT 5 
> from the command line (always worked before), but the system seemed to 
> hang.  Video was off.
> 
> I rebooted, went to INITTAB and changed init to 5 and rebooted.  
> Probably a tragic mistake.
> 
> Now on boot, right after UDEV gets an OK, the screen goes blank and the 
> drive stops turning.
> 
> I tried booting with the 5.1 kernel, and same behaviour with the system 
> blanking out and all load activity stopping after UDEV loads.
> 
> So I am quite stuck at this point.
> 
> Is there an option that I can edit into the kernel command at boot time 
> to init in 3?  And then what do I try?
Reboot your system, when you see the grub menu, press a key. Select the
kernel you wish to boot and press 'e', select the kernel line, press 'e'
again and add '3' at the end of the line (or '1' if you wish to boot in
single user mode). Then press  and 'b' to boot. Your system
should now boot up in level 3. You can log in as root at the login
prompt. If that even doesn't work, the reboot in single user mode.

For the rest, we first need
logfiles, /var/log/messages /var/log/boot.log and
maybe /var/log/Xorg.0.log

Regards,

Michel



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RE: [CentOS] 5.2 blues

[Michel van Deventer]

On Wed, 2008-06-25 at 13:30 +0200, [EMAIL PROTECTED] wrote:
> Andreas Micklei <> scribbled on Wednesday, June 25, 2008 12:37 PM:
> 
> > Thank you CentOS team for the good work!
> 
> I second that!
Me too !! And another donation on its way to CentOS ! :)

Regards,

Michel


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Re: [CentOS] 5.2 blues

[Michel van Deventer]

Hi,

On Wed, 2008-06-25 at 12:29 +0200, [EMAIL PROTECTED] wrote:
> Hi all,
> 
> Am I the only one to have had a totally trouble-free upgrade to 5.2?? I get 
> the 
> feeling that most everybody seems to have *some* problems...
I upgraded 4 machines (all virtual) without any problems from 5.1 to
5.2, tonight I'll upgrade the host machine but I do not expect any
problems.
I'm only cautious to upgrade my old webserver which is a dual PIII and
is located about 100km from my home ;) I wouldn't like a kernel panic
there.

Regards,

Michel


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Re: [CentOS] Re: booting usb stick

[Michel van Deventer]

Hi,

On Mon, 2008-06-16 at 13:08 -0400, Jerry Geis wrote:
> > Hi,
> > 
> > On Mon, 2008-06-16 at 10:38 -0400, Jerry Geis wrote:
> > > Hi all,
> > > 
> > > I have been trying to get a usb stick 8G to boot centos.
> > > I am as far a it boots and hangs at "Switching to new root".
> > > 
> > > I take the same USB stick and put it another PC and it boots fine.
> > > 
> > > What might I look for as to why the machine hangs at switching to new 
> > > root?
> > > 
> > > Of course the machines are different. The one that does not boot is an 
> > > ebox 2300sx and
> > > the one that does boot is an amd 4800+ with all disks unplugged except 
> > > the USB stick.
> > > 
> > > I am so close.
> > Looks like the ebox 2300sx has a Vortex86sx chip, which is i486
> > compatible, not i686 like a default CentOS install/live. You might have
> > to compile a new kernel for i486 architecture or use a different distro
> > which is directly i486 compatible.
> > 
> > Regards,
> > 
> > Michel
> > 
> > p.s. getting this to work on a 2300sx might be a challenge :) But CentOS
> > doesn't support the i486. So you're on your own ;)
> > 
> >   
> I found a howto for the 2300sx, I have used their config for kernel
> 2.6.18, applied their patch.
> This is all good. I boot now and I get all the way to "Switching to
> new root" and then it just stops.
> 
> It gets past "Red Hat nash starting 4.2.1.13"
> 
> What might it looking for here that it is stopping?
You libraries are probably still compiled for i686, you will  have to
recompile them too. So it would be more of a challenge to get things
working. I remember trying to get a CentOS distro running on a Via EPIA
board (533 or 800MHz) but that failed for the same reasons. Installing
Debian worked for me then :) 

> What might be something I can try?
Recompile your libraries for i386 or i486. But then you might run into
other binaries that are compiled for i686. As said before, CentOS
doesn't support i586 and lower.

Regards,

Michel


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Re: [CentOS] booting usb stick

[Michel van Deventer]

Hi,

On Mon, 2008-06-16 at 10:38 -0400, Jerry Geis wrote:
> Hi all,
> 
> I have been trying to get a usb stick 8G to boot centos.
> I am as far a it boots and hangs at "Switching to new root".
> 
> I take the same USB stick and put it another PC and it boots fine.
> 
> What might I look for as to why the machine hangs at switching to new root?
> 
> Of course the machines are different. The one that does not boot is an 
> ebox 2300sx and
> the one that does boot is an amd 4800+ with all disks unplugged except 
> the USB stick.
> 
> I am so close.
Looks like the ebox 2300sx has a Vortex86sx chip, which is i486
compatible, not i686 like a default CentOS install/live. You might have
to compile a new kernel for i486 architecture or use a different distro
which is directly i486 compatible.

Regards,

Michel

p.s. getting this to work on a 2300sx might be a challenge :) But CentOS
doesn't support the i486. So you're on your own ;)

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Re: [CentOS] exam

[Michel van Deventer]

Hi,

> is it possible to prepare for a certified (big North American Linux
> vendor) engineer exam with a CentOS install ?
I assume the Linux vendor you mean is Red Hat, then yes, you can.

> I have heard that the test contains questions on specific GUIs, are
> they included in the CentOS distribution?
I am an RHCA and I did all my preparations for exams with CentOS (except
for the RH423, it uses Red Hat Directory server).
CentOS and Red Hat are more than alike enough for the exams (and the
courses by the way :) ).

Regards,

Michel




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Re: [CentOS] Compact Flash..

[Michel van Deventer]

Hi,

On Sun, 2008-06-08 at 16:38 -0500, Ryan Nichols wrote:
> Ok.. Im curious.. Can I install CentOS on a compact flash card, then 
> have the MySQL on another drive? to have the compact flash like read 
> only for the OS to boot from, then do the swap, mysql,etc from the other 
> drive?  How hard would this be to do?
Yes, you can (of course). My backupserver boots from CF (only kernel
+initrd) and then continues from harddrive.

I do not have a howto here but if you search google, you'll probably
find a lot of them.

Regards,

Michel


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Re: [CentOS] OT: really dumb question about APC UPS

[Michel van Deventer]

Hi,

On Sun, 2008-06-08 at 01:45 -0700, Jamie Lists wrote:
> We have about 4 servers connected to an APC UPS. The UPS only has one
> UPS connection. So my question is, in a power outage how do i get all
> my servers to safely shutdown? Do i run a USB hub? Do i write a script
> on the one machine connected to turn off all the other machines? I'm
> confused.
If you use the apcupsd software you can create a network (UPS) server
and clients which will automatically shutdown on a signal from the
server. But make sure you connect your network switch to the ups as
well ;) You then only have to connect 1 machine to the ups which will
act as a server for the other three.

Regards,

Michel


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Re: [CentOS] Samba AD valid users issue

[Michel van Deventer]

Hi,

On Fri, 2008-06-06 at 17:26 -0400, [EMAIL PROTECTED] wrote:
> I have setup a new server centos 5.1 server as a storage 
> server with over 7TB of storage. The server has been 
> integrated into a large Active Directory network there are 
> 5 primary AD servers and a large number of local AD server 
> at each location (over 20). There are also over 15 trusted 
> domains hundreds of groups and thousands of users. It has 
> been quite a challenge to integrate the Linux server with 
> Samba into this incitement. I am now at a point where I 
> can change user and group ownership of filed and folders 
> at AD users and connect to the server with a windows 
> client.
> 
> There are also issues with Samba not starting on bootup 
> (yes the service is set to start at level 3 – system 
> starts non GUI). And it seems to take quite a while for 
> system to recognize domain users on startup.
> 
> The [TEST] share works with out issue.
> The [TEST-ENG] share is not working no matter what I do.
> 
> The issue that I am having is that most of the groups have 
> a [EMAIL PROTECTED] at the beginning.
> Ie: @DIV-Engineering
> This conflicts with the Samba “valid users = “ directive 
> in the smb.conf.
> 
>I have been able to change the group ownership to 
> [EMAIL PROTECTED] in the file-system without any issues.
> 
> 
> Is there any way to do this?
> 
> 
> [global]
>  workgroup = XXX
>  realm = XXX
>  server string = Samba Server Version %v
>  security = ADS
>  auth methods = guest, sam, winbind
>  obey pam restrictions = Yes
>  password server = nycbcc01.xxx.ad.xxx.net
> #   winbind separator = \\
> #   passdb backend = tdbsam
>  wins server = 192.20.76.98
>  ldap ssl = no
>  winbind use default domain = yes
>  idmap uid = 1-10
>  idmap gid = 1-10
>  winbind enum users = Yes
>  preferred master = no
>  encrypt passwords = yes
>  template homedir = /home/samba/%D/%U
>  cups options = raw
> 
> [homes]
>  comment = Home Directories
>  read only = No
>  browseable = No
> 
> [printers]
>  comment = All Printers
>  path = /var/spool/samba
>  printable = Yes
>  browseable = No
> 
> [TEST]
>  path = /home/samba/shares/TEST
>  valid users = @"XXX\Domain Users"
>  force group = "XXX\domain users"
>  read only = No
>  create mask = 0774
>  force create mode = 0775
>  directory mask = 0775
>  force directory mode = 0770
>  force directory security mode = 0770
> 
> [TEST-ENG]
>  path = /home/samba/shares/TEST
>  valid users = @"[EMAIL PROTECTED]"
>  force group = "[EMAIL PROTECTED]"
>  read only = No
>  create mask = 0774
>  force create mode = 0775
>  directory mask = 0775
>  force directory mode = 0770
>  force directory security mode = 0770
Having a quick glance at the config I remember I had a sort of same
issue, set your winbind seperator character to something like '#' and do
the same in the valid users and groups and it should give you more
working stuff ;) The \ character is a line break which tells samba to
continue reading the config on the next line including spaces and
linebreaks...


regards,

Michel

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Re: [CentOS] sendmail and spam

[Michel van Deventer]

Hi,

On Thu, 2008-06-05 at 00:23 -0500, Les Mikesell wrote:
> Alain Terriault wrote:
> >
> > What is todays most effective combination to filter spam ?
> > 
> > On my old Redhat 3 system I used Sendmail and Spamassasin .. it was
> > good, but with the current setup we are getting way to much spam.
> > 
> > Looking around I found new players, well some I did not know then and
> > they are very interesting..
> > 
> > MailScanner .. http://www.mailscanner.info/
> > Sagator .. http://www.salstar.sk/sagator/
> > Smf .. http://smfs.sourceforge.net/index.html
> > dspam .. http://dspam.nuclearelephant.com/index.shtml
> > 
> > I am tempted to go with smfs because it is familiar .. but, mailscanner
> > seems popular
> 
> Another good choice is MimeDefang (http://www.mimedefang.org/).
> There are rpms of it and clamav in the rpmforge repo.
> 
I use a combination of Postfix with rbl, spamassassin, clamav and
amavisd. It filters about 95-98% of my spam. I also have a spamcop
account to report the spam that gets through.

Regards,

Michel


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Re: [CentOS] xinetd question

[Michel van Deventer]

Hi Jerry,

On Tue, 2008-04-29 at 08:32 -0400, Jerry Geis wrote:
> I am using centos 5.1 x86_64
> I am wanting to restart xinetd
> 
> when I do "service  xinetd restart"
> it says xinetd unrecognized service
> 
> when I do "/etc/init.d/xinetd restart"
> I get no such file or directory.
> 
> How does one restart xinetd?
On a CentOS 5.1 system, xinetd is not installed by default and thus not
startable. You should first install xinetd using 'yum -y install
xinetd'. Then you can restart xinetd. Where do you need it for ?

Regards,

Michel van Deventer


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Re: [CentOS] how do I run something on a newly installed server, on it's 1st boot only?

[Michel van Deventer]

Hi,

you can use the %post part of the kickstart for that, then your script
will run after installation is complete but before the reboot. If you
need to run it after the first reboot, I'd put it in /etc/rc.d/rc.local
and let it remove itself after running succesfully. And of course copy
the script to the server using the %post part of kickstart ;)

Regards,

Michel


On Sat, 2008-03-29 at 09:11 +0200, Rudi Ahlers wrote:
> Hi all
> 
> I'm busy with a kickstart file to automate server installations, and I 
> need to run a bash script right after the server has been installed for 
> the first time. But the script only needs to run once, and it needs to 
> run automatically. How do I do that?
> 

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Re: [CentOS] SSl Certificate problem

[Michel van Deventer]

Hi Tom,

the location of SSL certificates changed from C4 to C5, certificates are
located in /etc/pki/tls on C5. Apache is also a newer version on C5
(2.2 , 2.0 in C4). You should check your configs manually and change
them accordingly. I can help you if you post your C4 config.

Regards,

Michel van Deventer

On Fri, 2008-03-28 at 18:37 -0400, Tom Diehl wrote:
> Hi,
> 
> I have a c4 server that I am trying to migrate an ssl site over to a new C5
> machine with all of the updates. The certificate is an equifax cert and works
> as advertised on the C4 server. When I move it over to the C5 machine I get
> error in firefox that says error code -12227 which 
> http://www.mozilla.org/projects/security/pki/nss/ref/ssl/sslerr.html says is
> an SSL_ERROR_HANDSHAKE_FAILURE_ALERT. In addition it says that this means 
> that "SSL peer was unable to negotiate an acceptable set of security
> parameters."
> 
> If I try to open the site in IE, it prompts for a client certificate. This
> fails because I am not using client certs.
> 
> In the apache config for ssl.conf I have "SSLVerifyClient none". I have also
> tried setting it to "optional" with the same results.
> 
> In the past moving these sites to a different machine was as simple as
> copying the certs and the config files over to the new machine, reloading
> httpd and everyting just worked. Is there something different about ssl on
> C5? Does anyone know a good way to troubleshoot this.
> 
> Google and the docs are not helping.
> 
> What am I missing?
> 
> Regards,
> 

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Re: [CentOS] Allocaation resource error (DELL Optiplex 755)...

[Michel van Deventer]

Hi,  

I had EXACTLY the same problem, running Fedora 8 (64-bit) on a Optiplex 755
with 4Gb and a 8600GT. You should update you DELL bios to rev A07 (released
about a month ago) then it works. There's a know bug in bios A04 and lower.

   Regards,

   Michel van Deventer

On Fri, 29 Feb 2008 20:05:47 +1100, John.Giovannis wrote
> Hi all,
> 
> (My first time in seeking assistance via the CentOS mailing list ... 
> Not sure if I should be submitting this as a possible kernel bug).
> 
> I've successfully installed Cent OS 5.1 (kernel: 2.6.18-53.1.13.el5) 
> on an Optiplex 755 (EM64T). However I'm not able to get a NVIDIA Gigabyte
> 8600GT (PCI-e) card to work with the system despite successfully
> installing the latest NVIDIA drivers
> (NVIDIA-Linux-x86_64-169.07-pkg2.run).
> 
> I've tested the same configuration in Windows with no difficulties.
> 
> I suspect the kernel is not able to allocate the appropriate hardware
> resources possibly resulting in the card failing to fire up properly:
> 
> Some diagnostics:
> 
> A snippet of the Xorg log file:
> 
> # more /var/log/Xorg.0.log | grep -E 'WW|EE'
> (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
> (WW) INVALID MEM ALLOCATION b: 0x13a00 e: 0x13aff
> correcting
> (EE) Cannot find a replacement memory range
> (WW) INVALID MEM ALLOCATION b: 0x13800 e: 0x139ff
> correcting
> (WW) INVALID IO ALLOCATION b: 0x13800dc80 e: 0x13800dcff
> correcting
> (EE) end of block range 0x < begin 0x13800
> (EE) Cannot find a replacement memory range
> (EE) NVIDIA(0): The NVIDIA GPU at PCI:1:0:0 is not supported by the
> 169.09
> (EE) NVIDIA(0): NVIDIA driver.
> (EE) NVIDIA(0): Failed to initialize the NVIDIA graphics device!
> (EE) Screen(s) found, but none have a usable configuration.
> 
> # dmesg | grep Cannot
> PCI: Cannot allocate resource region 8 of bridge :00:01.0
> PCI: Cannot allocate resource region 8 of bridge :00:1c.0
> PCI: Cannot allocate resource region 1 of device :00:03.3
> PCI: Cannot allocate resource region 0 of device :00:19.0
> PCI: Cannot allocate resource region 1 of device :00:19.0
> PCI: Cannot allocate resource region 0 of device :00:1a.7
> PCI: Cannot allocate resource region 0 of device :00:1b.0
> PCI: Cannot allocate resource region 0 of device :00:1f.3
> PCI: Cannot allocate resource region 0 of device :01:00.0
> PCI: Cannot allocate resource region 3 of device :01:00.0
> 
> # lsmod | grep nvidia
> nvidia   8885796  0 
> i2c_core   56129  3 i2c_ec,nvidia,i2c_i801
> 
> # lspci -v | grep -E
> '00:01.0|00:1c.0|00:03.3|00:19.0|00:1a.7|00:1b.0|00:1f.3|01:00.0'
> 00:01.0 PCI bridge: Intel Corporation 82Q35 Express PCI Express Root
> Port (rev 02) (prog-if 00 [Normal decode])
> 00:03.3 Serial controller: Intel Corporation 82Q35 Express Serial KT
> Controller (rev 02) (prog-if 02 [16550])
> 
> 00:19.0 Ethernet controller: Intel Corporation 82566DM-2 Gigabit Network
> Connection (rev 02)
> 
> 00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
> Controller #2 (rev 02) (prog-if 20 [EHCI])
> 00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
> Controller (rev 02)
> 
> 00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI 
> Express Port 1 (rev 02) (prog-if 00 [Normal decode])
> 00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller
> (rev 02)
> 01:00.0 VGA compatible controller: nVidia Corporation GeForce 8600 GT
> (rev a1) (prog-if 00 [VGA])
> 
> Is it likely that I need to try an older kernel or attempt to patch the
> current one ?
> 
> Any suggestions are appreciated,
> 
> John
> 
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Re: [CentOS] Using tcpdump to sniff telnet password

[Michel van Deventer]

Hi,

you should set the snaplen (length of packets to be captured) to 0 (max
packetsize) like :
tcpdump tcp port 23 -s 0 -w test.txt
Otherwise you won't get the full packets.

And you can use wireshark to read the dumpfile and easily find the
password(s).

Michel

On Wed, 2008-02-06 at 15:57 +0700, Fajar Priyanto wrote:
> Hi all,
> As long as I can remember reading various articles/docs, they all say that 
> telnet is not secure because all traffic is in clear text. Well, out of 
> boredom, I try to sniff username and password from a telnet session.
> 
> The command I use: tcpdump tcp port 23 -vvv -w test.txt
> Then I read the result: strings test.txt 
> |`D 
> |fD 
> |fD 
> 38400,38400
> Red Hat Enterprise Linux ESD 
> Ologin: D 
> 5eE 
> LsE 
> _tE 
> Password: F 
> [aG 
> |hG 
> jaH 
> Last login: Wed Feb  6 15:53:3H 
> ]0;[EMAIL PROTECTED]:~
> GV{
> 
> But it succeeds with FTP.
> strings test.txt 
> <.9@
> 4.:@
> 220 (vsFTPd 2.0.1)
> 4.;@
> @.<@
> USER test4
> 331 Please specify the passwor
> 4.=@
> B.>@
> PASS secret
> 230 Login successful.
> 4.?@
> :.@@
> SYST
> 215 UNIX Type: L8
> 4.A@
> 
> 
> Did I miss something? How do we capture telnet password using tcpdump?
> Thank you.
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Re: [CentOS] cannot rewrite shadow password file

[Michel van Deventer]

On Fri, 2008-02-01 at 17:29 +0100, Samuel Rochas wrote:
> Dear Michel,
> 
> > Whatś the output of :
> > getenforce
> >   
> Enforcing
> 
> > ls -Z /etc/shadow 
> >   
> -r  root root system_u:object_r:shadow_t   /etc/shadow
> 
> After running those commands, I can run passwd without errors (passwd: 
> all authentication tokens updated successfully), but the password won't 
> be changed.
> 
> > might be an SELinux issue
> > If so, you can do a "restorecon /etc/shadow"
> >   
> Did it, still can't update the password.
To completely rule out SELinux..
Do "setenforce 0" 
try to change password
Please make sure that ALL fields are accounted for in the shadow file
and there are no line breaks!
As a final solution you can try to remove the password of root
completely (in runlevel 1), reboot, login as root and change the
password again.

Regards,

Michel van Deventer

> 
> Regards
> Samuel
> 
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Re: [CentOS] cannot rewrite shadow password file

[Michel van Deventer]

On Fri, 1 Feb 2008 16:52:21 +0100, Ralph Angenendt wrote
> Samuel Rochas wrote:
> > Dear Ralph,
> >
> > Sorry...
> > - /etc/shadow
> 
> Okay, so that's not it, either.
Whatś the output of :
getenforce

ls -Z /etc/shadow 

might be an SELinux issue
If so, you can do a "restorecon /etc/shadow"

   Regards,

   Michel

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Re: [CentOS] CENTOS and INTEL S775 C2D E6750 2.66G 1333 RTL

[Michel van Deventer]

At 06:29 27-9-2007, Art Edwards wrote:

I am building a Centos machine for a specific piece of third party
software.

Can I assume that the IA64 verson of CENTOS 4.5 will run on this CPU?


No, you cannot run IA64 on a Core2Duo, you need the AMD64 or x86_64 version.


Are there any differences in basic libraries between 4.0 and 4.5?


Yes of course, it is wise to install the latest version, otherwise 
some hardware may not be recognized by the kernel.


Regards,

Michel




Art Edwards
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Re: [CentOS] BIND issues, server not responding

[Michel van Deventer]

>From what I see you have iptables 'in the way'.
Try to add the following rule to iptables and then try again :) 
iptables -I RH-Firewall-1-INPUT -j ACCEPT -p udp --dport 53 

If you like to have zone transfers or large queries done as well then you also
need to open a port for tcp/53
iptables -I RH-Firewall-1-INPUT -j ACCEPT -p tcp --dport 53

(to make the changes permanent do a 'service iptables save' after adding the
lines)

   Regards,

   Michel



On Thu, 23 Aug 2007 08:28:05 -0400, Ray Leventhal wrote
> Feizhou wrote:
> > Hello Ray,
> >
> >> Appears to be listening how I expected it to be, unless I'm not reading
> >> this right.
> >
> > Running 'dig www.swhi.net @64.135.16.15'
> >
> > ; <<>> DiG 9.2.4 <<>> www.swhi.net @64.135.16.15
> > ; (1 server found)
> > ;; global options:  printcmd
> > ;; connection timed out; no servers could be reached
> >
> > Robert suggested looking at your firewall. What rules do you have
> > related to port 53 udp?
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> Hi Feizhou,
> 
> As I'm not at all expert in my understanding of iptables I can't say
> definitely that there are any rules on port 53 udp but, here's the
> output of /sbin/iptables -L:
> 
> [EMAIL PROTECTED] ray]# /sbin/iptables -L
> Chain INPUT (policy ACCEPT)
> target prot opt source   destination
> RH-Firewall-1-INPUT  all  --  anywhere anywhere
> 
> Chain FORWARD (policy ACCEPT)
> target prot opt source   destination
> RH-Firewall-1-INPUT  all  --  anywhere anywhere
> 
> Chain OUTPUT (policy ACCEPT)
> target prot opt source   destination
> 
> Chain RH-Firewall-1-INPUT (2 references)
> target prot opt source   destination
> ACCEPT all  --  anywhere anywhere
> ACCEPT icmp --  anywhere anywhereicmp any
> ACCEPT esp  --  anywhere anywhere
> ACCEPT ah   --  anywhere anywhere
> ACCEPT udp  --  anywhere 224.0.0.251 udp dpt:mdns
> ACCEPT udp  --  anywhere anywhereudp dpt:ipp
> ACCEPT tcp  --  anywhere anywheretcp dpt:ipp
> ACCEPT all  --  anywhere anywherestate
> RELATED,ESTABLISHED
> ACCEPT tcp  --  anywhere anywherestate 
> NEW tcp dpt:ssh REJECT all  --  anywhere anywhere
> reject-with icmp-host-prohibited
> 
> >From what is posted above, does it appear that iptables is the issue?
> 
> Thanks for all the help and advice!
> 
> Kind regards,
> ~Ray
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Re: [CentOS] Using HTTP proxy for yum

[Michel van Deventer]

On Wed, 22 Aug 2007 11:17:37 +0100, Dogsbody wrote
> >>> Is there a way to use an HTTP proxy (with a user/pass) with yum?  Or
> >>> at least a way to pass a user/pass through yum?  I have a situation
> >>> with a CentOS server behind a web filter appliance.
> >>
> >> Add the following to /etc/wgetrc
> >> http_proxy = http://username:[EMAIL PROTECTED]:8080/
> >> ftp_proxy = http://username:[EMAIL PROTECTED]:8080/
> > 
> > Since when does yum read wgetrc?
> 
> I believe yum uses wget (or libraries) and wget reads wgetrc, I 
> picked this up from the yum mailing list and it works too! :-)
Setting the local vars HTTP_PROXY and FTP_PROXY is also enough if you just
want to use it in the current session.

   Michel


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