CentOS 5 :: 12GB Of RAM On 32bit XEN Kernel - MemInfo Versus XMTop
Feb 10, 2010
I have a server with 12 Gig or ram in it (has per bios detection). Free and meminfo agree.
[root@virtualHost ~]# free
total used free shared buffers cached
Mem: 7726080 794136 6931944 0 50036 391236
-/+ buffers/cache: 352864 7373216
Swap: 8385888 0 8385888
xm top does not :
xentop - 13:36:07 Xen 3.1.2-164.11.1.el5
5 domains: 2 running, 3 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 12577024k total, 12575312k used, 1712k free CPUs: 4 @ 2833MHz
In my /proc/cpuinfo I can see pae in the flags. None of my domUs are going to need more than 3 GB of ram but I was wondering what is the REAL ammount of RAM accessible to the system. If I run 4 domU at the same time. Around 7 GB or 12 GB?
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Jul 14, 2010
I have a system with a missing or damaged kernel and I need to reinstall some software to fix it (see this thread for reference removed xen and kernel is gone). I feel fairly certain I can fix my system with the info in that thread however I don't know if this was a 32bit or 64bit system. How can I tell after using the dvd and linux rescue or does it even matter?
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Apr 5, 2010
I demo'd 9.10 32 bit and got my wlan woking using ndiswrapper. Then, I decided to install the 64 bit version and I cannot get my driver to work. Can't find a 64 bit driver for my D-link DWA-130 USB adapter. What is the easiest way to uninstall 9.10 so I can install the 32 bit version? Is it as simple as reformatting the ubuntu partition?
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Jan 24, 2010
I recently installed debian squeeze 32bit on a second partition of my amd athlon 64 X2 dual core machine.Currently it is using linux-image-2.6.32-trunk-686 kernel.But linux-image-2.6.32-trunk-amd64 is available.on the repository.Is it a 64bit kernel or 32bit kernel optimized for amd64 architecture?
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Jun 25, 2010
I've 12GB of RAM and its showing as 11.4
I'm running Ubuntu 10.04 x64
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Mar 15, 2011
I placed Ubuntu on the same drive as my windows XP is, and there were no problems, everything was fine, all drivers were working...I need to use kernel 2.6.29 and i read about "how to install a new kernel" on this forum. I downloaded 3 files, I installed them in a good sequence. After reboot I can choose between 3 kernels, and if I choose this, then there is a mounting problem:
mounting none on /dev failed
Afterthat there is written something else, what I cant read. Some seconds later ubuntu boots, but my (non-USB) mouse isnt working.
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Mar 19, 2010
Use python as example, I have 64bit python 2.4.3 yet I can't found rpm for 32bit one so I try to build it.Use default make or make --enable-readline is ok, python make cannot use CFLAGS, can use OPT and LDFLAGS to add -m32, yetit seems can only search for 64bit lib, or else crush.[Moderator edit: Moved from CentOS-4 to CentOS-5 forum.]
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Dec 26, 2010
I have got an Notebook whose CPU is 64bit.The Notebook has an CentOS installation. Now I want to find out if this CentOS is 32bit or 64bit.How can I check this?
uname -a
gives something with ....i686 i686 i386...."
What does that mean?Does that refer to the hardware or the CentOS OS? An 32bit CentOS can be installed on a 64bit hardware!I am interested in the OS capability not of the hardware!
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Sep 17, 2010
Google answers attempted:
# grep lm /proc/cpuinfo
# uname -m
# file /sbin/init
# file /usr/bin/file
I don't think none of the above gives deterministic answer. Since I have 32-bit & 64-bit different system all of above spit out the same info.
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Aug 12, 2011
I have been running F14 as a 32-bit system (original m/b was 32-bit). Now the system is on a 64-bit dual-core processor board and I'd like to change from the 32-bit kernel to 64-bit. I downloaded a 64-bit kernel (kernel-2.6.35.6-45.fc14.86_64.rpm) and attempted to install it. It won't install and Package Installer returns a message of the sort that says this file "has incompatible architecture.
Valid architectures are ['athlon', 'i686', 'i586', 'i486'....]". My processor is an Athlon 64 x2. Is it possible to do what I want to do (I only want the kernel at the moment)? Is there some Fedora file I need to modify to allow the system to install the 64-bit kernel for this m/b? Do I need another file (or files) installed before I install the kernel?
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Jun 20, 2011
Or do I need to d/l a new ISO that's 32bit?
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Jun 8, 2011
I am trying to install ffmpeg-php on a centos 5.6 32bit. First I installed php-devel,yum install php-devel. I downloaded the ffmpeg-php from here to /usr/local/src by this commands;
1.wget "http://downloads.sourceforge.net/project/ffmpeg-php/ffmpeg-php/0.6.0/ffmpeg-php-0.6.0.tbz2?use_mirror=garr"
2.tar xjvf ffmpeg-php-0.6.0.tbz2
3.cd ffmpeg-php-0.6.0
4.phpize
5../configure
6.make
7.make install
Now the output of the ./configure, make and make install is here below. Can someone tell me what I am missing to successfully install ffmpeg-php?
[Code]...
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Feb 12, 2009
I have two CentOS servers on the same LAN. One is CentOS 4.7 the other 5.2 They both also have a WAN interface to the same remote network. On CentOS 4.7 I can ping the remote network through the CentOS 5.2 server. i.e. ping -I eth0 remotehost On CentOS 5.2 I can NOT force the ping to go out the CentOS 4.7 server without over riding my routing tables to make eth0 a more direct route than the eth1 route.
On 5.2 If I do the ping -I eth0 remotehost, and a tcpdump on eth0, the outbound ping will not be going out eth0, he overrides it and sends it out eth1. In fact, on CentOS 4.7 if I do not have a route to the remote network through the other server (turn proxy arp off on the 5.2 machine), I will get "Destination Host Unreachable". I would ideally like to get the 5.2 machine to behave the way the 4.7 machine does.
My real life application for this is that I have a CentOS server in a location that controls access to the Internet. There is another router on the netowrk that handles traffic back to our corporate office. the CentOS server also has the ability to get to the corporate office. I ping the corporate office through eth0 to find out if the link through the other router is indeed up and active. I want to make this a CentOS 5.2 server but alas, I can not tell if the other route is up or not.
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Feb 17, 2011
I'm running CentOS V5.5. I am intererested in several packages available under RHEL V5. Is it possible to install these directly into CentOS or should I be looking for a package built for CentOS 5 specifically?
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Feb 18, 2011
How does yum determine to "upgrade" an rpm verses "install" (and possibly delete) a package when performing a yum update? I have read documentation that yum uses the "Obsolete" and "Conflicts" tags within the rpm to determine whether to upgrade or install a new rpm. Is this correct and complete? I recall from somewhere kernel rpms should always be installed and never upgraded. How does yum determine that kernel rpms need to be installed using rpm -i as opposed to rpm -U? I have scanned a kernel spec file looking for clues without any luck.
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Jul 1, 2011
I'm currently trying to setup Slackware 13.7 on a server, using software RAID 1. I'm using the README_RAID.TXT document at the root of the Slackware disc as a reference. Anyway, here's what I have so far.
/dev/md1 -> /boot partition
/dev/md2 -> swap partition
/dev/md3 -> / partition
Code:
[root@raymonde:~] # fdisk -l /dev/sd{a,b}
Disk /dev/sda: 41.1 GB, 41110142976 bytes
255 heads, 63 sectors/track, 4998 cylinders, total 80293248 sectors
Units = sectors of 1 * 512 = 512 bytes
[code]....
I created an initrd image using mkinitrd -F, added an according stanza to /etc/lilo.conf and ran 'lilo' after that. Now I can boot on the vanilla huge kernel all right. But I can't seem to boot on the generic kernel. Whenever I try to do this, the boot process stops short on the following error message:
Code:
mount: mounting /dev/md3 on /mnt failed: Device or resource busy
ERROR: no /sbin/init found on rootdev
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Mar 8, 2010
I have been a RPM-based distribution guy for a long time (redhat,centos,suse). We have a large shared and dedicated web environment that is starting to require more and more linux. I am in a position to switch gears and move to ubuntu if it makes sense. Things that are important to me are:
1. ease of deployment (both servers and websites themselves)
2. patch management
3. documentation
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Oct 7, 2010
(Second Try) I installed CentOS 5.5 from CDs 32 bit, everything works fine. I then re-install, but this time 64 bit, everything else is the same, I use all of the same options. This time though it sees the network card, and allows me to configure it and activate it. It will not connect outside of it's self, IE it can ping it's self, but nothing else. Go back to 32 bit, and zero problems, try 64 again, no network. Each time I do full installs with partition formatting etc. In case it makes hill-o-beans difference, Intel P4, 2.66 Ghz. 2.0 GB RAM MSi Motherboard.
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Oct 7, 2010
I have installed centos 5 64 bit in my machine but all the dependencies like php, httpd, glibc, gcc, gd, openssl and others are 32 bit, I need them to be updated to 64 bit.
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May 3, 2009
I've been trying to compile a small program on my 64bit Centos 5.3 but I need to compile it in 32bit mode. I've tried editing the make file and changing CC=gcc to CC='gcc -m32" and that doesn't work. I have also tried to use "make CC='gcc -m32' and that doesn't work either. It wont compile. Do I need to install something with yum to get 32bit compiler to work?
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Sep 20, 2009
I have searched the whole google but did not find anything. I am trying to install a game server using hldsupdatetool.bin which can be found here, [URL]. Unfortunately it can only run on 32bit Operating Systems. I need it to run on 64bit. What do I need to install? Please be specific since I am really new to linux. Please tell me what I exactly have to type in the command prompt.
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Jan 2, 2010
I have installed Citrix Xen-Server on my server and managed to install Windows 2003 R2 Server successfully.I also installed CentOS 5.3. The installation went fine, however, I cannot get Gnome or KDE going. I only have the text interface.
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Oct 23, 2009
This is a 64 bit machine
[root@intergate2 log]# rpm -q perl --qf '%{NAME} %{VERSION} %{ARCH}'
perl 5.8.8 x86_64
[root@intergate2 log]# yum install perl
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* addons: mirror.stanford.edu
* base: mirror.hmc.edu
* extras: mirror.raystedman.net
* updates: centos.eecs.wsu.edu
Setting up Install Process
Resolving Dependencies
---> Running transaction check
---> Package perl.i386 4:5.8.8-18.el5_3.1 set to be updated
---> Package perl.x86_64 4:5.8.8-27.el5 set to be updated .....
Transaction Summary
Install 1 Package(s)
Update 1 Package(s)
Remove 0 Package(s)
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May 26, 2010
I'm trying to install the 32bit 10.04 server to an atom machine from a CD burned with ubuntu-10.04-server-i386.iso. The installer is presenting me with the:"No kernel modules were found" ..error message. Is the atom cpu and chipsets supported by the 32bit server installer?
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Sep 27, 2009
after update to kernel-2.6.18-164.el5 one of the 2 NIC's of my machine are only found at 1 of 4 reboots. Using the old one kernel-2.6.18-128.7.1.el5 all is fine. This are the to NIC's:
00:0a.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
00:0b.0 Ethernet controller: Intel Corporation 82557/8/9/0/1 Ethernet Pro 100 (rev 0c)
And the Intel one, makes the problems with the new kernel.
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Nov 6, 2009
I compiled my kernel, compiled scsi support into kernel, used the new kernel and initrd, the boot failed.Then ,i unzip my initrd, found that sd_mod.ko can't be insert, i added it manual, and reboot OK.so, why! in the kernel configure , the sd_mod.ko is set to <M> , but why it can't be found in initrd?
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May 29, 2010
The server runs# uname -r2.6.18-128.4.1.el5However, today I executed yum update kernel*due to security advisory. I was just about to reboot the system when I realized that it runs VMWare Server Instance that will most likely fail to restart after kernel upgrade (I had a hard time fixing it after previous kernel update). Now I want to keep 2.6.18-128.4.1.el5 after reboot.I see that new kernel is scheduled for booting:
# cat /etc/grub.conf
default=0
timeout=20
[code]....
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Oct 31, 2009
I'm running CentOS 5.3 and would like to know what the "best" or "proper" method is to build a custom kernel using the generic kernel sources from kernel.org. Most of the references I've found talk about modifying the current CentOS kernel using the RPM way. I really want to have the latest kernel due to some important security issues that haven't been addressed in the current CentOS 5.3 kernel.
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Jul 9, 2009
The first server I installed installed fine. The second server, installed with the same config, went to "kernel panic not syncing no init found try passing init= option in kernel" error. I tried reinstalling but it keeps going to that error after install reboot. The storage is ISCSI connected via Intel Server Adapter, which allows it to boot from ISCSI. Not sure if that's the cause for the problem, but the first server is connected to the same ISCSI and installed just fine.
Is there a way that I can make sure ISCSI module installs during installation? Although I think it is installed since it's able to copy the files and setup /dev/sda. I just wana make sure that it installs during setup.
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Feb 28, 2010
I built a home server (NAS/WWW/SSH/media server etc) and chose CentOS 5 as the OS (stability, easy of configuration).I was just about to start tuning the power consumption when I realised that the kernel CentOS uses is so "old" that it does not support the latest reduced power consumption enhancements that Linux has achieved in big strides in the recent past (we are probably still talking 6-12+ months ago e.g. tickless kernel)..
So my questions; 1) I know CentOS was maybe not meant for home servers (certainly its not its primary purpose), but if it is, any ideas of what kind of power consumption it takes (I know its relative) and if there are particular power consumptions that are worthwhile?
2) Do you recommend me compiling my own 2.6.21+ kernel from kernel.org or am I just likely to have compatibility issues (I really did not want to do that) or when is CentOS 5.4 supposed to have a newer 2.6.21+ version kernel?
Was it wrong of me in principle to choose CentOS for a home server when I am power conscious? (I don't have a low-power VIA processor either but a P4 so I am really just hoping to make do with software changes).
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