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34753 discussions

Checking how many DIMM slots are in use
by Ow Mun Heng 24 Sep '07

24 Sep '07

Hi, I'm wondering if there's a method for doing any of these 1. Check what's the physical memory available. free -m shows ~768 mem but I was sure that I had 1G of memory in there. 2. I check the kernel and it seems like the 4G split is in effect so it should map / correctly recognise there's 1G of Mem there. Is there any way to check besides opening up the machine to look at it physically??

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fstab problem after a failed drive
by Gregory P. Ennis 24 Sep '07

24 Sep '07

Everyone, I installed a sata drive on a SuperMicro with SCSI drives. No problem with the installation. Everything went as expected as the os recognized the drive and assigned /dev/sdc to the new 300 gig Seagate drive. I had planned to use this drive for backup tarballs. The drive had been functional for about a week with no problems. Apparently it went out today when I tried to reboot the system. Now the boot process brings the system up into repair mode, but mounts the / partition in "read only" status. I can see that the original /dev/sdc is present but /dev/sdc1 is not present. I removed the drive completely and predictably /dev/sdc is no longer present. The problem I have now is that I have an entry in /etc/fstab that references the disabled drive that I am unable to change because I can only get to /etc/fstab in "read only" status. I am sure there is way to remove the entry to /dev/sdc1 but I have not been able to do so. Any help would be appreciated Greg Ennis

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CentOS 5.0 crash (cifs bug ?)
by Kuang-Chun Cheng 24 Sep '07

24 Sep '07

Hi I think I hit the cifs bug described at http://wiki.centos.org/TipsAndTricks/WindowsShares and http://bugs.centos.org/view.php?id=1776 As CentOS Wiki said, CentOS 5.0 do have a bug fixed cifs.ko, so I thought it should be in CentOSPlus repository ... so I upgrade my kernel and using 2.6.18-8.1.10.el5.centos.plus. After I use this kernel release, I check the cifs.ko and see the following: $ modinfo /lib/modules/2.6.18-8.1.10.el5.centos.plus/kernel/fs/cifs/cifs.ko filename: /lib/modules/2.6.18-8.1.10.el5.centos.plus/kernel/fs/cifs/cifs.ko version: 1.45 description: VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows license: GPL author: Steve French <sfrench(a)us.ibm.com> srcversion: 7C1A34565EA00CE993D56FA depends: vermagic: 2.6.18-8.1.10.el5.centos.plus SMP mod_unload 686 REGPARM 4KSTACKS gcc-4.1 parm: CIFSMaxBufSize:Network buffer size (not including header). Default: 16384 Range: 8192 to 130048 (int) parm: cifs_min_rcv:Network buffers in pool. Default: 4 Range: 1 to 64 (int) parm: cifs_min_small:Small network buffers in pool. Default: 30 Range: 2 to 256 (int) parm: cifs_max_pending:Simultaneous requests to server. Default: 50 Range: 2 to 256 (int) The cifs.ko is version 1.45 .... I think this is still the buggy version, right ??? I have two CentOS 5.0 boxes, both running 2.6.18-8.1.10.el5.centos.plus and using automounter to mount WinXP's share. I use this as part of my daily backup ... and both boxes crash quite often ... specially when I have large files cross cifs mounted filesystem using rsync. For small files, they are quite stable. Could someone tell me ... did I use the bug fixed cifs.ko ? Or how can I fix this problem ? Thanks Regards KC

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X11 virtual screens on centos 5
by Jerry Geis 24 Sep '07

24 Sep '07

When the you select an X11 virtual screen (1 of 4) with the mouse on default centos 5 what command gets executed to show screen 1, screen 2 etc... Basically, I want to have a command or know the command to execute to show the desired virtual X11 screen. Thanks, Jerry

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question on "yum --enablerepo=centos "
by Rogelio Bastardo 24 Sep '07

24 Sep '07

I'm installing Fruity for Nagios using the 4.4 Single Server CD and want to force upgrade PHP 4 to PHP 5 without having to upgrade everything on CentOSplus. In order to install Nagios, I have to first enable RPMforge. However, to use Fruity, I have to use PHP 5, which isn't included in the RPMforge repository, unless I enable CentOSplus and yum update/upgrade everything (which I did eventually, just to get everything working). While in 4.x, I tried to enable *just* PHP with a command (something like) the following: yum --enablerepo=centosplus upgrade php* After doing so, however, I got all these errors saying that it couldn't update it b/c other things were needing updating (Pear, I think, was one of them). Perhaps this had to do with me installing RPMforge and using protect-plugins. Is there a way to force an update of, say, PHP and have also force an update on everything directly needed to install PHP? I don't mind everything directly associated to the one package I need being updated, but I'd prefer to peg the other programs and not let them update.

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Disk De-Fraging in Linux
by Al Sparks 23 Sep '07

23 Sep '07

A couple of questions. Are there any linux tools that can de-frag an ext2/3 partition? Are there any advantages to doing so if you're running hardware RAID5? Are there advantages / disadvantages if you're running LVM? === Al

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(gnome-session:5212) error
by Todd Cary 23 Sep '07

23 Sep '07

One user gets the gnome-session: 5212 error when he tries to log on. The error states that "Could not create /home/.gnome2/ Permission denied" and "Could not create ~/.gnome/ Permission denied" Any suggestions are welcomed...... Todd -- Ariste Software 2200 D Street Ext Petaluma, CA 94952 (707) 773-4523

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Re: [CentOS] CentOS 5 on IA64
by Les Bell 23 Sep '07

23 Sep '07

Karanbir Singh <mail-lists(a)karan.org> wrote: >> There will be an IA64 CentOS-5 beta soon, and the plan is to have IA64 release at the same time as i386 and x86_64 for CentOS-5.1. << Any word on s390 and s390x? I don't need it myself, but I've been talking to a number of mainframe users recently and they expressed interest. Best, --- Les Bell, RHCE, CISSP [http://www.lesbell.com.au] Tel: +61 2 9451 1144 FreeWorldDialup: 800909

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chmod / chown settings on /var/www/html
by Rogelio Bastardo 23 Sep '07

23 Sep '07

I'm setting up a new CentOS 4.4 server to work with Fruity (a frontend program that operates Nagios). For security purposes, what chmod and chown settings do you put on the /var/www/html folders? Also, can anyone recommend any good LAMP hardening guides? While I'm not planning on putting this into production, I'd like to cover all my bases before that's an issue.

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install freezes at partition layout
by Barry Schiffman 23 Sep '07

23 Sep '07

I'm trying to install centos 5 on an old machine, a Micron with a pentium III and 250 megs of ram. I'm using the DVD image. The media check said the DVD was OK. Everything starts fine (both in graphics and text modes), untl I get to the custom partition table. The new system will go on hda, with the boot and root partition reformatted (see below). I laid it out to preserve the data on /home and another two partitions with a lot of data on each. One of these is mounted as /proj but Anaconda shows it as a giant swap partition. After I'm done with the formatting and mount points, I say OK, and then nothing happens. I left it run for over an hour, and then bailed out. Before rebooting, I looked at the console messages. There were a couple of warnings but no indications of anything fatal. Just nothing for over an hour. I'm downloading a new image (actually the CDs) just in case the media's bad. I also suspect the partition layout may be a problem. It was done long ago on the first hard drive: /boot 100 megs / 10 gigs /home 10 gigs extended ... /proj 25 gigs /opt 10 gigs swap 500 megs Once the CDs are in, I'll try again. If it fails, I'll do a new partition table on the first hard drive -- I have everything backed up. If anyone has a better idea, or if I'm way off base, let me know. hda -> ST360021A, ATA 60 gig Seagate hdb -> Maxtor 6Y160L0, ATA 150 gig Thanks, Barry ____________________________________________________________________________________ Be a better Globetrotter. Get better travel answers from someone who knows. Yahoo! Answers - Check it out. http://answers.yahoo.com/dir/?link=list&sid=396545469

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