Whats The Latest Stable Kernel For Centos OS 5 Server

Oct 15, 2007

Can someone tell me which one is the latest stable kernel version available for centos 5 that should be running on the server?

Is #1 SMP Thu Jul 12 20:38:34 CST 2007 i686 athlon i386 GNU/Linux.


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Latest Linux Kernel Version

Jan 19, 2007

Is it safe to upgrade to the latest Linux kernel version (released on January 10th, 2007) ? Is there any reported problems or have anyone faced issues after upgrading?

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Dec 5, 2008

I'm using centos 5.2. To my surprise this only comes with php 5.1.6 and apache 2.0

I want the latest versions, php 5.2.7, apache 2.2.10, mysql 5.1 -- Are there any repositories for this available? (Or however I can upgrade with yum)

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Centos + Kernel 2.6.9-34.0.2- How To Upgrade Kernel

Apr 29, 2007

Last year I ordered a new server with Centos 4.3 and it had the kernel kernel 2.6.9-34.0.2ELsmp installed. It runned fine and I didn't update any packages since then.

Today I started getting a problem where both mysqld and kswapd0 uses very high amounts of CPU, spiking up to 100% and my memory usage is at 99% all the time. The problem seems exactly the same as the one mentioned in this thread.

In that thread the exact same kernel is said to be insecure and to cause this problem. I also came across a centOS bug that reports this problem with high cpu, mem usage and mysql & kswapd0 consuming all resources.

In the linked thread the person solved the problem by upgrading to kernel 2.6.9-42 using rpms but others recommended a newer kernel or a custom compiled kernel for CentOS.

Apparently when they used yum it said 34.0.2 was the latest kernel.

What should I do to upgrade the kernel, which version should i upgrade to, and where do I get it from? I won't be able to compile a custom kernel and I've only installed basic rpm packages before.

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Install 32 Bit Pae Kernel On Centos

Apr 3, 2009

i have a 32bit centos running with 8 gigs, but only 7 is registering when i contacted support they told me

Your server does in fact have 8GB of physical memory however the reason it is not being recognized is due to the fact that you are using a 32 bit operating system. By default, the 8GB would be recognized if it were a 64 bit OS however on a 32 bit operating system, you must install and boot into the PAE kernel (physical address extension) for the 8GB to be recognized and utilized. The PAE kernel can be installed through yum when connected to your server as root over SSH. Once you have installed the kernel, you will need to reboot the server for these changes to take effect

i tried

yum pae install

yum pae kernel install

both didnt work can anyone give me a quick step by step guide on how to go about this.

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Kernel-PAE And CentOS 5 32bit

Dec 23, 2008

I have a dedicated box with following specs
Core2Quad 2.4ghz
2x500gb hdd
8gb ram

I installed 32bit centos5 in it ( because I use lxadmin ;lxadmin wont support 64bit)
Installed kernel-PAE successfully and rebooted the server. but the server still boots into the old kernel. I need the kernel-PAE to be booted, then only I can utilize full RAM. help me . below there is ssh logs
[root@t241 ~]# cat /proc/meminfo
MemTotal: 3357036 kB
MemFree: 3204984 kB
Buffers: 8148 kB
Cached: 109516 kB
SwapCached: 0 kB
Active: 33504 kB
Inactive: 103664 kB
HighTotal: 2477180 kB
HighFree: 2343972 kB
LowTotal: 879856 kB
LowFree: 861012 kB
SwapTotal: 6409892 kB
SwapFree: 6409892 kB
Dirty: 16 kB
Writeback: 0 kB
AnonPages: 19524 kB
Mapped: 7608 kB
Slab: 7732 kB
SReclaimable: 3964 kB
SUnreclaim: 3768 kB
PageTables: 400 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 8088408 kB
Committed_AS: 45232 kB
VmallocTotal: 114680 kB
VmallocUsed: 3992 kB
VmallocChunk: 110560 kB
[root@t241 ~]# uname -rm i686
[root@t241 ~]# cat /etc/grub.conf
default 1
timeout 7
color cyan/blue white/blue
title=CentOS (2.6.18-92.1.22.el5PAE)
root (hd0,1)
kernel /boot/vmlinuz-2.6.18-92.1.22.el5PAE root=/dev/sda2 pci=nommconf
initrd /boot/initrd-2.6.18-92.1.22.el5PAE.img
root (hd0,1)
kernel /boot/vmlinuz root=/dev/sda2 pci=nommconf
[root@t241 ~]# rpm -qa | grep kernel
[root@t241 ~]#

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How To Build Kernel For Centos

Apr 3, 2007

how can i recompile kernel for centos with following options


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Kernel Update Needed For Centos 5

Nov 1, 2009

I am using cpanel My server runs with centos 5 With version 2.6.18-164.2.1.el5.plus

Does i need to keep updating kernal updates always for the server?

If so how i can update automatically?

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Openvz Kernel On Centos 64bit

May 21, 2009

I was Use Centos 64bit and when i install the openvz kernel and the openvzquota:


yum -y install ovzkernel

yum -y install vzctrl vzquota vzpkg

I reebot my server and never boot up

I was planning to use a 8gb ram that's why i select 64bit.

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Apr 5, 2009

Is there a correct way to do it?

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CentOs Kernel Upgrades....With Cpanel

Mar 29, 2009

I was wondering how I would go about ensuring my kernel is up to date on my vps. I am running centos and I have cpanel, so I am not sure if there is anything special that has to be done or avoided when running cpanel.

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How To Read CPU Temperature On CentOS 4.6 And 2.6.9 Kernel

Jul 30, 2008

how to read CPU Temperature on CentOS 4.6. and kernel 2.6.9 (CentOS kernel from yum)

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Recompile Centos Kernel 1000hz

Jun 1, 2007

I've setup a CS game server running centos 4 but I'm looking to recompile it with 1000hz.

Does anyone have any links to newbie friendly guides on how to do this without any problems?

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Centos 5 Kernel Irqbalance

Jun 9, 2007

When I try to compile kernel I get the following error.

kernel: irqbalance[1750]: segfault at 000001b202b70b20 rip 000001b2028f9cdb rsp 000077a8404178f0 error 6
kernel: grsec: signal 11 sent to /usr/sbin/irqbalance[irqbalance:1750] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:1749] uid/euid:0/0 gid/egid:0/0

I must have tryed to compile the kernel 20 different ways with or with out grsec and I still get the same irqbalance error.

My server is a
AMD Athlon 64 X2 4800+
2GB of DDR2 800 ram
x2 160GB hard drives soft ware raid 1
nvidia chipset mother board

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CentOS 5, CPanel 11, Kernel Buggy

Nov 18, 2007

(The box, 2 years now, never had issues before all you will read...)

I do have a box at the IP xxx.xxx.xxx.xxx, which on 15th Nov. was: AMD 4200+
with 300 GB hdd for OS, and CentOS 4.5 on it...

Because the system was facing few load problems of wrong installed applications, we decided to do a fresh OS reload to the latest OS version and

on 16th Nov, the box was up and running with CentOS 5, and cPanel 11.

the kernel is: 2.6.18-8.1.15.el5

After few hrs the box was done and IO restored all backups in it anbd all worked fine, I realized that I couldnt access cPanel, page was blank for

Also, most pages (except simple html) where showing internal error 500.

I did a reboot. probelm was fixed.

After few hrs, problem came up again...

I left ssh logged in to see whats wrong.

I found out that every few hrs, that issue was happening:

Message from syslogd@server at Sun Nov 16 11:47:21 2007 ...
server kernel: journal commit I/O error

Then, we had techs to check HDD for errors. they did fsck, and said disk has to be replaced (at this point, without wanting to offend anyone, I have to state that 90% of techs in datacenters, or at least at mine --won't name them, 99% you guess which DC it is...-- are just low paid students that don't know SIMPLE things...) so we told them to replace the HDD and do OS reload in new drive...

So, on 17th Nov. we had online a new HDD, 400 GB with CentOS 5 loaded in it, and cPanel 11...

After few hrs and all working and backups recovered, the issue came up again!

This time, with exactly same error, techs told us it may be RAM, so they replaced the RAM and we waited...

In 2,5 hrs, bang, it happens again, same error.

They say, it might be the sata cable...

we replace it...


we ask them to loook at it seriously, and after lot pressure, to avoid case that mo/bo or controller is wrong, they do upgrade us in a BRAND NEW colocated box, which was this time: Intel Core 2 DUO, 6300, with brand new 500 GB HDD and new RAM.

We recover in the new box the backups.

Box is online today at 18th Nov...

and the issue comes up again!

Message from syslogd@server at Sun Nov 18 11:47:21 2007 ...
server kernel: journal commit I/O error

I ask them what the **** is going on now and why after having all hardware replaced with new, and all OS reinstalled clean on new drives and new devices, 3 times, why we have again the same error...

And their response: power cable was loose, we replaced power cable...

Guys, sorry, this is really DUMP... loose cable cannot give that error...

and the error... continues!

Also, at this point, I have to let you know, that when this error comes up, (Message from syslogd@server at Sun Nov 18 11:47:21 2007 ...

server kernel: journal commit I/O error) the filesystem becomes READ-ONLY and
nothing gets affected, if we do a cold reboot by reset button, it comes up
again and all work PERFECT, until the issue comes back again.....

I am desperate with that, let me know what I have to do!

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Jun 22, 2008

Just to make things clear, i am not new at setting up VPS nodes, i have set up all of my servers with the HyperVM/OpenVZ setup and they work perfectly, but im having a problem with a new server.

Just received my new server, installed HyperVM-Slave, rebooted but the OpenVZ kernel was not installed for some reason, so i manually installed the OpenVZ Kernel using the RPM as yum seemed to install the wrong kernel.

I then installed the kernel using RPM and got this error at the end of installation:

grubby: unable to open /dev/hda: No such file or directory
grubby: unable to open /boot/boot.b: No such file or directory
grubby fatal error: unable to find a suitable template

I have never encountered this error with any of my other servers before...

Also after installation everything seems to be correct. /etc/grub.conf has the new OpenVZ kernel displayed, and default is set to 0, so upon startup it should be booting the correct kernel, but the thing is, when i reboot the machine the default kernel is loaded even though the grub.conf is configured to load the OpenVZ Kernel.

Im thinking that this may be due to the error i got when installing the kernel.

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May 15, 2009

I'm not sure if anyone else has come across this but I'm sure you are all aware that CentOS 5.3 default kernel comes with realtek support.

But the default realtek drivers have a bug in them when it slows down upload and downloads drastically and shows ping times above 2000+ ms in the same datacenter.

A fix for this is simply upgrading the kernel to the latest version available (2.6.29) with realtek driver support.

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HOW TO: CentOS Issue .. Kernel Update - SAS Drive

Apr 17, 2008

I installed CentOS 5 with SAS drive. But i forgot install kernel-PAE for more 4GB RAM. (i'm using 8GB RAM).

But now when i trying to install kernel-PAE or update kernel. I have issue with hda and fd0 ...

"WARNING: No module megasr found for kernel"

When i 'cat /var/log/messages' i got:

kernel: end_request: i/o error, dev fd0,sector 0
kernel: hda: packet command error: status=0x51 { DriveReady SeekComplete Error }
kernel: hda: packet command error: error=0x54 { AbortedCommand LastFailedSense=0x05 }

I tried to 'google' they to find the solution, but now i still not find out ...
I'll try to reload OS. After reload OS, if i dont have floppy disk, how can i update kernel with no error?

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Feb 18, 2008

I trying to compile new kernel on centos 5 and every time after "mkinitrd /boot/initrd-" I have error:

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Nevertheless, with the advent of cloud hosting, I'm intrigued by the idea of paying for what I actually use on a server rather than having way more capacity than I need 90% of the day.

I've looked around here and there's a bit of talk about it but it doesn't seem like folks are scrambling into it and it also appears that the offereings are still relatively immature.

I really don't have the time to devote to tweaking, etc or figuring out something really complicated.

I'll stick to my dedicated server if it means tons of extra work or potential downtime or massive frustration but I wanted to get some feedback from the community about whether or not there are some stable cloud hosting options that are emerging that might be worth considering.

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2. Move mysql and home folder to 4xSCSI raid 10

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MySQL 5.1.11

I kind of have 2 problems, the first being the one in the thread title and the second is while running any version of php my main site experiences slowdowns and hangs.

For some reason whenever I try to install a new version of PHP I have major problems. I have tried several times when new versions come out. I just recently tried the newest, 5.2.1, which I want to try and use, I think there are performance improvements for IIS and windows platform in the new 5.x versions?

Anyway I can install 5.2.1 and get it running, and my sites load, but soon after my main site starts to hang, stops loading or loads extremely slow. I can't figure it out. I even tried using the exact same PHP.ini settings from my old working php install.

So everytime I am forced to go back to the latest version that I know works with my server/sites, 5.0.3 [url]

If I restart IIS the pages start loading fast again right after, even recycling the worker process that the site uses usualy makes the pages load normal again.

I tried setting the worker process to recycle every 60min and to use 2 web gardens. These changes havn't really had any affect for better or worse.

Downgrading back to PHP 5.0.3 seems to run a bit more stable, but even with this version I get these slowdowns now. I have been running my site(s) on this server for 3 years now and most of the time they have ran stable.


I was sleeping this morning and recieved a text-message saying the site wasn't loading. So I wake up and the site indeed was pretty much not loading at all. I look at permon that I left running to see this: [url]

I give IIS a restart, which you can see above, then the levels go back to normal, here is a screen shot a couple minites later to what the "Current Connections" graph usualy looks like when the site loads fine. [url]

During this slowdown the CPU usage was not maxing out, was maybe averaging 60% and ram was 50%. I am getting a 2nd server soon to off-load the MySQL to it and have it dedicated for that. But i don't think that will help this current issue. Here is the system resources when the site is loading fine: [url]

I have around 40 or so other sites hosted on IIS and my main site "canadaka.net" which is purple on the top graph, is the only one that hangs or slowsdown. When this slowdown happens to this site, all the other sites on IIS, which are on a seperate worker process, continue to load fine.

I can't figure out why these slowdowns are happening.

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