Hi,
On 1/27/10, Ross Walker wrote:
>
> But if your doing mysql on top of LVM your basically doing the same,
> cause LVM (other then current kernels) doesn't support barriers.
>
> Still if you have a battery backed write-caching controller that
> negates the fsync risk, LVM or not, mysql or postgr
MySQL's acquisition was one of the factor, the client wants to keep
everything on the opensource side as far as possible.
On the technical side, all tables are using the InnoDB engine because
myISAM doesn't support either. Also previously during development, it
was discovered that on some particul
Hi,
>>>
>>> I believe the OP said he was running postgresql.
>>>
>>
>> Quoted from OPs previous mail hes not sure lol
>>
>> """The web application is written in PHP and runs off MySQL and/or
>> Postgresql."""
>
> Ah, well #1 on his list then is to figure out what he is running!
LOL, I know it
Hi,
> Split the TEXT/BLOB data out of the primary table into tables of their
> own indexed to the primary table by it's key column.
This is part of what I was planning to do, there are a lot of stuff I
am planning to split out into their own tables with reference key. The
problem is I'm unsure wh
Hi,
> 20 feilds or columns is really nothing. BUT That's dependant on the type
> of data being inserted.
20 was an arbitary number :)
> Ok so break the one table down create 2 or more, then you will have
> "Joins" & clustered indexes thus slowing you down more possibly. That
> is greatly depend
Hi,
> If you want a fast database forget about file system caching,
> use Direct I/O and put your memory to better use - application
> level caching.
The web application is written in PHP and runs off MySQL and/or
Postgresql. So I don't think I can access the raw disk data directly,
nor do I thin
I'm trying to optimize some database app running on a CentOS server
and wanted to confirm some things about the disk/file caching
mechanism.
>From what I've read, Linux has a Virtual Filesystem layer that sits
between the physical file system and everything else. So no matter
what FS is used, appl
Hi,
> - A: one is with 80 GB SSD (and 12 GB memory)
> http://www.ovh.co.uk/products/eg_ssd.xml
> - B: the other with 750 GB SATA2 (and 8 GB memory).
> http://www.ovh.co.uk/products/eg_best_of.xml
The Intel SSD are fast but have a history of firmware problems. So I
wouldn't suggest using them on a
t realizing it.
Now that I've purged the queue of those bounced messages and other
housekeeping for that user, server load has finally gone back to the
expected sub 1.0 levels so I can finally go and enjoy my holiday :)
On 1/1/10, Noob Centos Admin wrote:
> I initiated services shutdown
appy New Year :)
On 1/1/10, Noob Centos Admin wrote:
> Hi,
>
>> I do not know about now but I had to unload the modules in question.
>> Just clearing the rules was not enough to ensure that the netfilter
>> connection tracking modules were not using any cpu at all.
>
&
Hi,
> I do not know about now but I had to unload the modules in question.
> Just clearing the rules was not enough to ensure that the netfilter
> connection tracking modules were not using any cpu at all.
Thanks for pointing this out. Being a noob admin as my pseudonym
states, I'd assumed stoppi
Hi,
> Yes, these figures indicate that you are fairly close to being cpu bound.
>
> What kind of filtering are you doing? If you have any connection
> tracking/state related rules set, you will need to be using a fair
> amount of cpu.
Initially, when the load start going up, I had thought the APF
Hi,
> Dstat could at least tell you if your problem is CPU or I/O.
This was the result of running the following command which I obtained
from reading up about two weeks ago when I started trying to
investigate the abnormal server behaviour.
dstat -c --top-cpu -d --top-bio --top-latency
usr sys
Hi,
> You should also try out "atop" instead of just using top. The major
> advantage is that it gives you more information about the disk and
> network utilization.
Thanks for the tip, I tried it and if the red lines are any
indication, it seems that atop thinks my disks (md raid 1) are the
pr
Hi,
> > since initially it seems like the high load may be due to I/O wait
> Maybe this will help you to identify the IO loading process:
>
> http://dag.wieers.com/blog/red-hat-backported-io-accounting-to-rhel5
Thanks for the suggestion, I did install dstat earlier while trying to
figure things
Hi,
> Try blocking the IPs on the router and see if that helps.
Unfortunately the server's in a DC so the router is not under our control.
> You can also run iostat and look at the disk usage which also
> generates load.
I did try iostat and its iowait% did coincide with top's report, which
is
Hi,
> last time I saw something like that, it was a bunch of chinese 'bots'
> hammering on my public services like ssh.
>another admin had turned
> pop3 on too, this created a very heavy load yet they didn't show up in
> top (bunches of pop3 and ssh processes showed up in ps -auxww,
> however, plu
My Centos 5 server has seen the average load jumped through the roof
recently despite having no major additional clients placed on it.
Previously, I was looking at an average of less than 0.6 load, I had a
monitoring script that sends an email warning me if the current load stayed
above 0.6 for mor
On Fri, Jul 17, 2009 at 12:07 AM, James B. Byrne wrote:
> I have snmpd and mrtg running and reporting against my Cisco router.
> What I want to do is to configure snmp so that I can monitor
> network traffic across the host's own eth0 NIC. Is this even
> possible for a generic NIC running on a x8
Hi,
> A possible work-around is to use a VPN like openvpn to give you what
> look like normal routes to remote locations even with private addressing.
Given the amount of trouble I've had just getting monitoring to work,
I don't think I'm even going to try fiddling with openVPN.
Besides which, a
Hi,
> java. I don't remember seeing this problem when installing from the opennms
> yum
> repository, though.
I didn't expect it either, honestly. In most cases, updates/installs
does go relatively painlessly if I don't mess up following
instructions/guides. In this case, I guess I just tripped
Hi,
> well, i note there's a few versions of rrdtool in the various
> repositories. the stock CentOS 5 version 9from upstream) is 1.2.30,
> while rpmforge has 1.3.7, also a seperate rrdutils package (I have no
> idea whats in it)
*sigh* The stuff of nightmares, I did have 1.3.7 installed after
c
Hi,
> I don't see any similar problem on machines upgraded to Centos5.3 that
> are monitored with (and running) OpenNMS, so I'd guess that since you
> didn't change your snmpd.conf settings it is MRTG-specific.
I think it's my server, quite possibly I screwed up something during
the initial setup
Thanks guys for all the suggestions. None of it changed the situation
but I'm beginning to think that it might have to do with SNMP not
accepting word names in MRTG, or more specifically some kind of
language encoding issue.
This is because of the following reasons
1. It's been pointed that out t
Hi,
> Did the update overwrite your snmpd.conf file? The 'view' on the default one
> may not permit access to the things mrtg needs to see. Try changing it to .1
> to
> expose everything.
It might have done so. To be honest I have no idea since I've never
touched the SNMP configuration before
Hi,
> Perhaps the OIDs changed for the interfaces you are monitoring.
>
> Have you tried re-running cfgmaker to regenerate mrtg.cfg? It should
> pick up the correct OIDs again.
Yes I did, however the default MRTG configuration appears to contain
almost nothing. Consulting with others. it seems to
I got itchy fingers over the weekend and decided to fix what wasn't
broken and upgraded one of the older servers from Centos 5.2 to Centos
5.3. Following the recommended process of updating glibc and such
before the rest, it appeared to work perfectly and rebooted without
problem.
However, MRTG 2.
On Sat, Mar 28, 2009 at 9:58 PM, Robert Heller wrote:
> At Fri, 27 Mar 2009 23:48:04 -0300 CentOS mailing list
> wrote:
> Yes, the root file system has to be outside of the LVM -- the initrd
> does not start LVM, so LVM volumes are not available for mounting at
> that point.
As Norberto pointed
On Sun, Mar 29, 2009 at 3:13 AM, William L. Maltby
wrote:
> As a step to reducing the "pressure" and dissatisfaction of "Are We
> There Yet?" ("When will xxx be released?"), a simple publication of a
> projected time line will help. It should be updated as needed. It should
> understood that this
2009/3/27 Spiro Harvey :
> "required"? How do you figure anything is *required* of volunteers?
> Show me your support contract.
>
> If you're worried that CentOS is "late" or is stopping you from
> fulfilling your own contractual obligations, perhaps you should stop
> being a tight-arse and pay for
On Mon, Mar 23, 2009 at 11:49 PM, Ray Van Dolson wrote:
> There maybe needs to be a community leizon of some sort to help
> leverage these types of offers for help. Many of us are willing to
> help, but certainly don't have the necessary time cycles to do so as
> effectively as some of the rest o
On Thu, Mar 19, 2009 at 7:13 PM, James Bensley wrote:
> Shadies and Mentlemen;
>
> I am trying to be green and put our backup servers to sleep during the
> day and have them wake on LAN and fire back up at night for our
> nightly backups as "sleep" is a sort of low power usage mode.
Make sure you
On Thu, Mar 19, 2009 at 10:22 PM, John Hinton wrote:
> ATX, just
> powers down the computer, leaving the PS in a lowered power state, but
> apparently this can draw up to 60% of the working power needed.
60% would be a gross exaggeration, off the top of my head, an "OFF"
ATX PSU draws less than 1
I was back onsite and trying it again, in vain. Copied the conf from
another site's working setup and dumped directly, recreated with the
same names and all. No go.
So again removed and install samba again, made a blank conf file, fire
up SWAT and did the most basic config.
Even chmod 777 the dir
On Fri, Mar 6, 2009 at 12:11 PM, Craig White wrote:
> did you 'relabel' the entire filesystem? - that's pretty much necessary
> if you've been running the system without having SELinux running, at
> least in permissive mode.
SELinux had been running in permissive. I did not disable during
install
Spinning off from the other thread about SELinux, I just tried to
re-enable SELinux on my personal server hosting just email and forum
for a small local community.
Average load for this Intel Core 2 Duo box with 2GB of ram (usually
with some 1GB free) was generally below 0.4 for the last 24hrs,
av
On Fri, Mar 6, 2009 at 5:38 AM, Jim Perrin wrote:
> Real world example -> http://www.linuxjournal.com/article/9176
>
> SELinux stopped a mambo exploit from compromising the system. For LAMP
> systems, selinux and mod_security are pretty much a requirement for a
> secure setup.
Thanks for the link
On Fri, Mar 6, 2009 at 4:06 AM, Jim Wildman wrote:
> There are VERY definitive benefits to running SELinux. The best
> description I've found is that it is like an iron cage on the inside of
> a window. Even if something gets past the glass, its still inside a
> window. I've had SELinux stop ex
On Fri, Mar 6, 2009 at 3:57 AM, Scott Silva wrote:
> Learn to use a file editor and edit the configs yourself. That is the only way
> to have the best control.
That's generally how I try to do things, except sometimes hand
"written" doesn't work the way I expect it to. Then I'd like to have a
GU
On Thu, Mar 5, 2009 at 3:09 AM, Chuck Campbell wrote:
> Do I need to start over with a clean install again, and how do I avoid this
> problem the next time I try to run updates after the install?
Just my noob opinion, that if there's no practical and definitive
benefit from enabling SELinux, for
On Sun, Mar 1, 2009 at 2:21 AM, Les Mikesell wrote:
> But, if you want to do it the hard way, you probably have an
Unfortunately I do want to do it the hard way. While the SME server
would make things really easy, the lesson I learnt in the past with
easy thing is that, once something break, I w
On Fri, Feb 27, 2009 at 8:12 PM, JohnS wrote:
> How about chown -R root:staff /directory_name ???
> chmod -R 777 /directory_name ???
The directory was chown -R to staff:staff and chmod -R to 770
I'll give a try on 777 on Monday (US Sunday). They are currently using
an older Win2
I'm seriously befuddled by Samba now.
I followed the good advice given and got the previous server set up nicely.
I did the same thing on another one and it refuses to work.
1. useradd some users
2. gpasswd -a them to a "staff" group nd smbpasswd -a them
3. chmod g+s the staff directory
4. teste
2009/2/26 Rob Kampen :
> Hi gurus
> I have a CentOS 5.2 current x86_64 that has Thunderbird and Firefox working
> well for one user account (my wife) but will not play nice for my account.
Have you tried creating a new profile (not new Linux account) in
Firefox and see if the new profile will work
On Thu, Feb 26, 2009 at 9:41 AM, Agile Aspect wrote:
> I'm new to Xen and I'm not familiar with the jargon.
I'll second John's suggestion to go with VMWare Server. Being also
pretty new and noob to all these, my first attempt at running WinXP
and Win2003 Server in VMWare server was almost plain s
On Wed, Feb 25, 2009 at 1:20 AM, Les Mikesell wrote:
> That makes it somewhat harder to use multiple machines since you end up
> having to create and maintain passwords on each.
True, but the usual work behaviour here means that seldom happen. Even
if they do need to work on somebody else's machi
On Tue, Feb 24, 2009 at 6:26 AM, Ned Slider wrote:
> It is documented on the bug tracker and forums so is a well known
> issue and is fixed in system-config-samba-1.2.41-3.el5. You could
> always grab the upstream src.rpm now and build it yourself.
Thanks for the information, somehow it never str
On Tue, Feb 24, 2009 at 5:52 AM, Les Mikesell wrote:
> Is there a windows domain or AD in this picture somewhere?
Not at all for all the usual Windows network migrations I've been
setting up. Typically small offices with less than 20 people so they
simply used workgroups without domains.
> If yo
On Tue, Feb 24, 2009 at 3:23 AM, Ned Slider wrote:
> The samba configuration tool (system-config-samba) is finally fixed in
> 5.3 (due out soon) and will now correctly show added samba users :-)
>
Honestly, I'm so glad to see this! Although I won't likely benefit from it
until the next server i
On Tue, Feb 24, 2009 at 3:12 AM, Craig White wrote:
>
> probably not the answer you want to hear but...
> swat is supposed to be the tool for simple administration.
I was afraid of that. By the time I gave up and completed the task manually,
I was thinking maybe it might be easier to write my o
Everytime I have to setup samba to handle Windows users, sometime
inadvertently goes wrong or doesn't work the way I expected, or takes
forever to setup, especially when there are many users and various policies.
So far, the easiest, sureest and quickest method appears to be install
WindowsXP into
On Sun, Feb 22, 2009 at 7:05 PM, Ian Forde wrote:
> RAID in software, whether RAID1 or RAID5/6, always has manual steps
> involved in recovery. If one is using standardized hardware, such as HP
> DL-x80 hardware or Dell x950 boxes, HW RAID obviates the need for a
> "recovery procedure". It's ju
On Sat, Feb 21, 2009 at 11:42 PM, Chan Chung Hang Christopher <
christopher.c...@bradbury.edu.hk> wrote:
>
> Would running two CP command to copy 2 different set of files to two
>> different targets suffice as a basic two thread test?
>>
>>
> So long as you generate disk access through a file sys
On Sat, Feb 21, 2009 at 6:04 PM, John R Pierce wrote:
> Kay Diederichs wrote:
> > hdparm -tT tests one type of disk access, other tools test other
> > aspects. I gave the hdparm numbers because everyone can reproduce them.
> > For RAID0 with two disks you do see - using e.g. hdparm - the doubling
On Thu, Feb 19, 2009 at 4:22 AM, Ray Van Dolson wrote:
> The other side of the coin (as I think you mentioned) is that many are
> not comfortable having LVM handle the mirroring. Are its mirroring
> abilities as mature or fast as md? It's certainly not documented as
> well at the very least. :)
On Fri, Aug 15, 2008 at 8:56 AM, Filipe Brandenburger
<[EMAIL PROTECTED]>wrote:
> On Wed, Aug 13, 2008 at 18:43, Bill Campbell <[EMAIL PROTECTED]> wrote:
> > My experience with Firewire has not been all that good. I figured that
> > since Apple had been using it for years, and it is an IEEE stand
Scratch that last message. I removed the drive to verify the copied content
on another machine and realized I forgot to copy one folder. Plugged it
back, with the wrong connector, using the Firewire instead of USB, probably
because my mind was still on the Firewire issue.
This time round, gnome de
The kernel update was successful and dmesg returns the following
ieee1394: The root node is not cycle master capable; selecting a new root
node and resetting...
ieee1394: Error parsing configrom for node 0-00:1023
ieee1394: Node changed: 0-00:1023 -> 0-01:1023
ieee1394: Node added: ID:BUS[0-00:1023
On Wed, Aug 13, 2008 at 5:16 PM, Rainer Duffner <[EMAIL PROTECTED]>wrote:
>
> There's a reason someone came up with this eSATA stuff...
Unfortunately the machine has no more spare SATA connectors. Installing an
eSATA card and such, would probably be yet another learning experience on a
machine t
On Wed, Aug 13, 2008 at 4:50 PM, Laurence Alexander Hurst <
[EMAIL PROTECTED]> wrote:
> 2 things jump out:
>1. As has already been pointed out that is not a Centos Plus kernel.
> Did you reboot after installing the new kernel? (You have to reboot for a
> kernel update in order to be runnin
I got a WD 1TB My Book with eSATA/USB/Firewire400 connectivity to backup
data on a client Centos 5.1 machine.
USB 2.0 works fine out of the box but is rather slow, Nautilus predicts
about 1+ hour to fully backup just one day's worth of data or about 100GB.
So I was hoping Firewire would be faster
On Thu, Aug 7, 2008 at 11:53 PM, Ray Leventhal <[EMAIL PROTECTED]> wrote:
>
> My US$0.02 on this.I'm a fan of apf as a front-end to iptables...but it
> takes some reading to understand the switches and the entire RAB (reactive
> address blocking) configuration options. Sadly, RAB is poorly do
On Thu, Aug 7, 2008 at 1:54 AM, Sorin Srbu <[EMAIL PROTECTED]> wrote:
> Seen this?
>
>
> http://www.askbjoernhansen.com/2007/09/18/safely_change_firewall_rules_remotely.html
>
Unfortunately, only after you pointed it out :(
But thankfully whoever wrote APF apparently knows this, hence it does ins
Thanks Steward and Robert for those suggestions, they make plenty of sense!.
About the two SSH terminal, if I activate a wrong firewall change that
blocks the SSH port, would it not also terminate the existing terminals
since new packets going in would be rejected, or does it not affect already
e
Hi,
If you use
> su
> only, you assume root privileges without the root environment.
> Rather do
> su -
> which gives you the full root environment, including path.
> The same holds for other users, i..e
> su - joe
> switches the user to the user joe with full environment.
>
Thanks a million for
Hi,
On Wed, Aug 6, 2008 at 3:07 PM, Robert - elists <[EMAIL PROTECTED]>wrote:
> If server is not compromised, just edit the smtp configs to deny acceptance
> from that ip block
>
The EXIM configurations are even more nightmarish than iptables, which at
least made some sort of sense. I've been pl
On Wed, Aug 6, 2008 at 3:06 PM, Bent Terp <[EMAIL PROTECTED]> wrote:
> On Wed, Aug 6, 2008 at 8:29 AM, Noob Centos Admin
> <[EMAIL PROTECTED]> wrote:
> > Since I followed some of the rules about SSH and used a non-standard port
> > for SSH and disable SSHD listenin
More information, after noting the cyclical shutdown of the firewall, I
looked into crontab and found a line that stops apf every 5 minutes and
directs the output to null.
I cannot copy the exact line now because of my stupidity (good reason why I
call myself a noob).
After noting this, which obv
Hi,
Need some help about this as it's gotten me really concerned.
I'm probably reading too much into this but for about two weeks now my daily
log has increased by almost 10 times.
After running through a couple of days of logs with a script, it seems that
I'm getting flooded on SMTP from this I
On Sat, Mar 29, 2008 at 6:37 PM, Johnny Hughes <[EMAIL PROTECTED]> wrote:
> Well .. top says you have 4 processes running ... if that is consistent
> (4 processes always in a run state) then you should be able to determine
> the running processes with the command:
>
> ps -ef r
>
> (I think)
>
> I
Hi, I had been experiencing a problem on our dedicated server running Centos
5, and unable to successfully track down the problem.
Since about 6 days ago, I noticed a spike in load/CPU utilization which went
from a typical 0.2x-0.3x to 3.x. At the same time, average traffic also went
up and so did
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