CentOS 5 :: Memory After The Last Few Updates
Dec 4, 2008
The problem seems to be a memory issue. Seems the problem only started happening after the last few updates. I have tested the memory with memtest and both servers passed. There hasn't been any new software put on the servers for over 12 months. Server 1 - 3 gig of memory CentOS 5.2 - Linux version 2.6.18-92.1.18.el5 (mockbuild@builder10.centos.org) (gcc version 4.1.2 20071124 (Red Hat 4.1.2-42)) #1 SMP Wed Nov 12 09:19:49 EST 2008 Errors in log
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May 13, 2010
I'm running CentOS 5.4 and noticed that for the past month there haven't been any new updates showing up either on 'yum check-update' or 'yum update' (I'm interested in basic and security updates). Although this may be right, I wonder if there is an online reference where I can check the updates that are released for CentOS (security bulletins) and make sure if there is anything wrong with my update system.
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Aug 27, 2010
I just ran into a weird problem with a CentOS 5.5 64-bit server running VirtualBox 3.2.8 (I would run Vmware Server 2.0.2 if not for the well known fact that Vmware doesn't care about its Server line anymore and it doesn't run on CentOS > 5.3 without major splits). I currently have two guests in that VirtualBox setup, a CentOS 5.5 64-bit and a Fedora 13 64-bit. The CentOS 5.5 guest shows less memory available than configured. If, for example, I give the virtual machine 512MB of memory the guest OS only recognizes 380MB. If I give it 768MB it only recognizes 637MB, and so on. I don't have that problem on the Fedora guest - 1024MB configured, 1024MB available.
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Feb 6, 2011
In general CentOS search automatically after startup for available software updates.Then after some (~20-30) minutes an icon appears in the toolbar which the user can click and install the updates.How can I manually speed up/trigger IMMEDIATELY the search for updates (without waiting for the built-in search)?
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Mar 3, 2011
There have been no updates recently (for almost two months) on any of my CentOS 5.5 boxes when I run 'yum check-update'. I may be misunderstanding the repo setup, but looking at the file mod dates, it seems that there hasn't been an update since 2011-01-06:[URL]...Meanwhile, a prominent North American Enterprise Linux vendor has had multiple security and bug fixes since then:[URl]...Is CentOS 5.5 still getting updated, or am I missing something (quite possible).
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Apr 17, 2011
After doing an update a couple of days ago (had previously upgraded to 5.6), the font size in firefox (file forward reload, etc), terminal and the panel (using xfce) are significately smaller. Searching the web, mail lists and the forums have not resulted in finding anyone else with this problem. I did notice that glibc has a bug that is currently being worked on at Redhat but it is unclear if the font problem I am seeing is related. Note also, that the initial upgrade to Centos 5.6 was successful.
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Mar 18, 2009
I'm using hughesjr' kernel-rt and would like to use ext4 as well. Since the stable release of ext4 is in 2.6.28, I'm wondering if there are any plannedupdates to this kernel-rt release? If not, is it possible to patch this version (2.6.24.7-65.el5rt.centos) of the kernel with stable ext4 patches/tools?
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Mar 18, 2010
I have a problem with my CentOS installation, it only recognizes 6GB installed RAM. If I check dmesg it outputs this:
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how to reach full RAM capacity? CentOS is installed on HP DL160 G6 server and memory module positioning is correct.
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May 16, 2009
I ma porting an application from SUSE 10 Professional 64-bit to CentOS 5.3 x64 version. We have set the /etc/php.ini as in old server and set the maximum memory limit to 5GB (yes! We have ample of memory) for the process.It was working fine in old server but in new server, the Apache log always showed that it failed to allocate more memory for the application.We noticed that the error coming out while the application uses up to 1GB memory.Just wish to ask if the PHP in CentOS 5.3 has any restriction on memory usage?
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Jan 12, 2010
i have installed kernel-xen to my centos 5.4 server ( with yum install kernel-xen ). My server has got 8192 mb pyschal ram with PAE kernel; but after i installed xen kernel to system, my ram is being 7919664KB....how can i fix this ? i want see 8192MB RAM with xen kernel
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Mar 8, 2011
I installed new CentOS 5.5(X86_64) on my server. My server has 48 G RAM (12*4G) and can be found when starting server. Moreover, I installed dmidecode software to detect the memory. This software can find all the memory. I used command (top, cat /proc/meminfo) to check memory. Both commands can only find 33G RAM. uname -a command output like this: 2.6.18-194.el5xen #1 SMP Fri Apr 2 15:34:40 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
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May 2, 2009
This is just a curious question. I am trying to setup a LVS system with three layers: (1) Virtual Servers, (2) Real Servers & (3) Storage Servers.
Real Servers (RS) & Storage Servers (SS) are on private network. My question is, how RS & SS look for latest updates from the Internet?
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Feb 21, 2011
I know this is not as easy or simple as I talk this questions for a free distro. Is it possible, that the last update for the update repository is from 07. Jan. 2011? I know I can get the srpm from rh and compile it by myself.
Is it right --> in case of new releases and limited resources the updates for supportet releases are not highest priority and so we have to wait a little or compile it manually from rh source?
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Jul 28, 2010
I have xen kernel on a 5.4_64 though it seems to have always done this regardless of version. When I add a virt the control set shows the total machine memory minus what I just allocated to the new virt. This also shows up in the system monitor as total available ram. Problem arises in deleting and making new virts. The memory never reappears as usable after deleting virts. So now after testing several different setups I'm down to 1.4 gigs showing available on the dom0. What can I do to recover this lost memory? I've searched, read, looked every where I could think of and there just doesn't seem to be any information about deleting virts only adding them.
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Jan 24, 2011
root@XXXXX:~# uname -a Linux myserver 2.6.18-194.11.4.el5 #1 SMP Tue Sep 21 05:40:24 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux I'm having serious memory leak issues on a server running CentOS. Running 'top' I can't find any proccess with an unusual memory usage. Is there any other way to check what is using this memory? Right now it shows that I have 4.8GB of RAM used, but top shows only few proccesses, one with 4% and lots of 0.0%.
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Jul 30, 2011
I have a web server with the specs below and my apache server is being a hog using all my RAM 7gigs or 8gigs of ram. When there is a rush of traffic at once my whole server crashes and I have to reboot apache. The way my site is set up I have a tube script and I use the tube script to host videos on my forum I have 1000 videos on the tube script. I brought a bigger server and more ram because of the down time I been having . I am really trying to figure out why its crashing and using so much ram. I installed eAccelerator didn't seem to help with the apache server.
Intel Quad Core Xeon X3430 (4 x 2.40 GHz, 8MB Cache)
> 2-bay Supermicro Chassis and Motherboard
> 8 GB REG ECC DDR3 (twice your current setup)
> 250 GB Enterprise Grade SATA II
> 10 TB Bandwidth 1gig Uplink Port
> CentOS 64 Bit (Latest Stable)
TOP Command and free -m command screenshots are attached this is with only 160 people online at once
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Feb 17, 2009
Cent OS 5 support 8 GB Memory on a 32 Bit System?
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Sep 27, 2009
I have a custom-built machine running CentOS5.3 final x64. It has an AMD Dual-Core 64bit 3GHz processor. I have installed 8gb of DDR2 memory in the system, which the BIOS correctly reports. However, CentOS only shows ~5GB. What happened to the other 3??! I am using the machine as a VMWare Host, so every gig counts.Here's what meminfo says:
# cat /proc/meminfo
MemTotal: 5976376 kB
MemFree: 39552 kB
Buffers: 43204 kB
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Dec 8, 2010
I have a server for virtualization (Xen) and when I do a free -m it does not show all the memory (which should be 64GB), it shows 32GB (a considerable difference, isnt it?).
My hardware is a Dell R410 server:
Dual Xeon 5530
64GB DDR3
4x SAS 500GB in RAID 10
I tried to compile Xen 4.0.1 but I can't solve a compile error that it gives me (if you want to take a look: [URL]) that is the end of the compilation including the error. But, I installed Xen from yum directly after reformating the HD and it works fine now.
My kernel version: 2.6.18-194.26.1.el5xen x86_64
CentOS 5.5 64 bit
[root@server1 xen-4.0.1]# cat /proc/meminfo
MemTotal: 33554432 kB
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Nov 28, 2008
I have been trying all day but so far I am unable to configure yum to use a proxy server to retrieve updates.Due a recent compliance mandate direct internet access had to be removed for a pool of our Cent/RHEL servers. I have added the http_proxy environment variable in /etc/profile using:
export http_proxy=http://ourproxy:8080
export ftp_proxy=http://ourproxy:8080
export gopher_proxy=http://ourproxy:8080
I am using the FQDN of the proxy server, and i can ping that FQDN from the CLI without a problem. When I do this and I reboot the server I can get to the internet through the proxy using links/lynx. Yum however stalls out after loading plugins. I have read in a few places that I need a trailing / after the port number above, adding this and rebooting has no effect.
So I tried specifying the yum.conf file... [URL]. When I do this yum still tries to contact the redhat/cent network directly. No behavior change. If I use tcpdump I can see the server I am running yum on try to directly connect without the proxy, which times out for good reason.
The proxy server I am running is squid, but I can see the server I am running yum on blatantly ignore any proxy settings I have tried so far. I am really in a hole on this one as I have to get several updates to fix vulnerabilities found during our last scan.
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Mar 26, 2009
I think my CentOS 5.2 servers are not receiving updates. The last update in my logs occurred on Feb 5th 2009;
Feb 05 09:55:45 Updated: nss - 3.12.2.0-4.el5.centos.i386
Feb 05 09:55:52 Updated: xulrunner - 1.9.0.6-1.el5.i386
Feb 05 09:55:53 Updated: nss-tools - 3.12.2.0-4.el5.centos.i386
Feb 05 09:56:00 Updated: firefox - 3.0.6-1.el5.centos.i386
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Nov 10, 2009
After making many updates via pup, including FreeNX, my FreeNX installation has broken. It worked flawlessly before the update. Now when I try to connect my client connects, I see the NoMachine splash screen and then I lose the connection with the following details:
Info: Display running with pid '3404' and handler '0x1a037e'.
NXPROXY - Version 3.1.0
Copyright (C) 2001, 2007 NoMachine.[code]......
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Nov 28, 2009
I have created a yum repository in my local network. Everything seems to be working well except the yum server doesn't remember what was updated, every time I run yum on it the same fies are updated (306 files). And the versions I checked are the same as the files already installed.
____________
yum .conf
[main]
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Dec 2, 2009
Is there a mailing list or an alert where I can subscribe to, so I know if there's critical or moderate patches I have to apply to my Centos 5 servers.
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Dec 15, 2009
how can I remove old kernel updates? Should I delete not usable kernel files from /boot ?
grub.conf was manual changed, here new config:
#vi /boot/grub/grub.conf
title CentOS (2.6.18-164.2.1.el5.028stab066.10)
root (hd0,0)
kernel /vmlinuz-2.6.18-164.2.1.el5.028stab066.10 ro root=LABEL=/ acpi=off noapic nodmraid
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Sep 8, 2010
I have my server configured to update automatically every night. However, updates are failing with the following message: There was a problem updating the system. The following error message was reported:
['Not installing key'] If the problem persists, manual intervention may be required. how to troubleshoot or resolve this issue?
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Jan 25, 2011
From where to download Cent OS 5.2 updates for samba? I would like to download samba 3.0.28 rpms.
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Jun 7, 2011
I recently installed an image of CentOS 5.4 on my machine.Through copious yum updates and one kernel update, I now find my /etc/issue says that I am at CentOS release 5.6 (Final).However, I need to be at 5.4, which is why I installed it in the first place. How do I first find out which updates are responsible and second revert the responsible updates?
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Feb 14, 2011
I just don't know how centos is using the memory but... I took a look at httpd conf, may be I've missed something when I type "free mem" in ssh the memory is increasing while I'm playing one video, flv and mp4 on my site. it is increasing each time I play a different videos either the same.
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Feb 27, 2010
I found out that my CentOS 5.4 linux does not use any swap memory! here is the #top output:
top - 10:02:49 up 27 min, 5 users, load average: 4.22, 3.45, 2.24
Tasks: 173 total, 4 running, 166 sleeping, 0 stopped, 3 zombie
Cpu(s): 71.1%us, 26.1%sy, 0.0%ni, 0.2%id, 0.0%wa, 2.7%hi, 0.0%si, 0.0%st
Mem: 3081388k total, 1729216k used, 1352172k free, 69544k buffers
Swap: 5140760k total, 0k used, 5140760k free, 865316k cached
I wonder why swap memory is not used! I also face auto-restart issue while running few tasks. Does it relate to the swap memory?
uanme -r -> 2.6.18-164.el5
I remember that my i have allocated about 5G for swap memory. However I put it into different partition and far away from root partition due to diskspace partition. Does it matter?
I do not know how to show the swap memory partition or partition map over here.
here is the mount output
/dev/sda2 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
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