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Server hangs on CentOS 5.5
by Michael Eager 11 Mar '11

11 Mar '11

Hi -- I'm running a server which is usually stable, but every once in a while it hangs. The server is used as a file store using NFS and to run VMware machines. I don't see anything in /var/log/messages or elsewhere to indicate any problem or offer any clue why the system was hung. Any suggestions where I might look for a clue? -- Michael Eager eager(a)eagercon.com 1960 Park Blvd., Palo Alto, CA 94306 650-325-8077

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Installation failure
by Mark 11 Mar '11

11 Mar '11

I'm trying to reinstall CentOS on a machine I've reconditioned for it, but for reasons I can't fathom, when the installation disk comes up and prompts for the install type, and I type either <enter> (graphics isntall) or "linux text"<enter>, after it loads the initrd image, the machine shuts off. It's an older machine I built myself (and ran CentOS on for a number of years), AMD Athlon 64 x2, 2GB of memory, 2 SATA hard drives, ECS GE6100PM-M2 motherboard. I should probably even know the answer to this one, but I'm stumped. Any suggestions? Thanks.

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Race condition with mdadm at boot [still mystifying]
by Chuck Munro 11 Mar '11

11 Mar '11

This is a bit long-winded, but I wanted to share some info .... Regarding my earlier message about a possible race condition with mdadm, I have been doing all sorts of poking around with the boot process. Thanks to a tip from Steven Yellin at Stanford, I found where to add a delay in the rc.sysinit script, which invokes mdadm to assemble the arrays. Unfortunately it didn't help, so it likely wasn't a race condition after all. However, on close examination of dmesg, I found something very interesting. There were missing 'bind<sd??>' statements for one or the other hot spare drive (or sometimes both). These drives are connected to the last PHYs in each SATA controller ... in other words they are the last devices probed by the driver for a particular controller. It would appear that the drivers are bailing out before managing to enumerate all of the partitions on the last drive in a group, and missing partitions occur quite randomly. So it may or may not be a timing issue between the WD Caviar Black drives and both the LSI and Marvell SAS/SATA controller chips. So, I replaced the two drives (SATA-300) with two faster drives (SATA-600) on the off chance they might respond fast enough before the drivers move on to other duties. That didn't help either. Each group of arrays uses completely drivers (mptsas and sata_mv) but both exhibit the same problem, so I'm mystified as to where the real issue lies. Anyone care to offer suggestions? Chuck

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Installing odbtp on CentOS 5.5
by Ron Young 11 Mar '11

11 Mar '11

I have just bought a new machine and of course installed CentOS 5.5 x86_64 from a recently created DVD. So the machine has: PHP Version => 5.2.17 MySQL Client API version => 5.0.77 Apache/2.2.3 Does anyone know how to get odbtp installed? I have followed all the INSTALL and README instructions that came with the odbtp package including the README.64bitOS file. There has got to be a trick some where that I am missing. TIA. Regards, Ron Young 919-621-9015 http://www.linkedin.com/in/ronhyoung +++++++++++++++++++ Little tiny dreams require little tiny thoughts and little tiny steps. Great big dreams require great big thoughts and little tiny steps. +++++++++++++++++++

1 0

Re: [CentOS] Creating the symbolic links in the /boot and /boot/grub/
by Todd Cary 11 Mar '11

11 Mar '11

I inadvertently missed using the list...here are my recent messages. On 3/8/2011 8:39 PM, Nico Kadel-Garcia wrote: > On Tue, Mar 8, 2011 at 11:31 PM, Todd Cary<todd(a)aristesoftware.com> wrote: >> reinstall is not an option for yum. I ran "yum install kernel" and it >> completed without errors however there are no links created. > Oh, dear. Can you grab the RPM and do "rpm -U -replacepkgs > [kernel-whatver].rpm"? You should be able to use "yum remove" on the > old kernel packages, consistent with freeing up the space, and now > install your new kernel with yum. > >> Would this be the correct ln command for vmlinuz-2.6.9-89.35.1 >> >> # /boot/vmlinuz-2.6.9-89.35.1 /boot/vmlinuz >> >> Todd >> >> On 3/8/2011 7:04 PM, Nico Kadel-Garcia wrote: >>> On Tue, Mar 8, 2011 at 9:58 PM, Todd Cary<todd(a)aristesoftware.com> wrote: >>>> I started a new thread since the original one is getting rather long. >>>> >>>> I have retrieved the files I deleted in /boot and /boot/grub, >>>> however I need to make links for >>>> >>>> /boot/System.map (System.map -> System.map-2.6.9-89.35.1) >>>> /boot/vmlinuz (vmlinuz -> vmlinuz-2.6.9-89.35.1) >>>> /boot/grub/menu.lst (menu.lst -> ./grub.conf) >>> Instead, re-install your kernel. "yum reinstall kernel". This should >>> regenerate your symlinks correctly, except possibly the grub.conf. >>> >>>> If it was not so important to get it correct, I would appreciate >>>> the syntax for the command. Usually I would figure it out. >>>> >>>> Since I have restored the files (I will double check to make sure >>>> they are all there), do I need to run grub-install? >>> i think yes. The old location of the boot loader is listed in >>> /boot/grub/grub.conf, and should be used as the argument to that >>> command. grub is much smarter than LILO used to be, but I think the >>> bootstrap procedure relies on knowing details of where the fiddly bits >>> of grub live on the relevant ex2 compatible filesytem. >>> >>>> My apologies for bothering everyone with such a dumb error on my >>>> part. >>>> >>>> Todd >>>> >>>> -- >>>> Ariste Software >>>> Petaluma, CA 94952 >>>> >>>> http://www.aristesoftware.com >>>> >>>> _______________________________________________ >>>> CentOS mailing list >>>> CentOS(a)centos.org >>>> http://lists.centos.org/mailman/listinfo/centos >>>> >> -- >> Ariste Software >> Petaluma, CA 94952 >> >> http://www.aristesoftware.com >> >> > -- Ariste Software Petaluma, CA 94952 http://www.aristesoftware.com

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mod_encoding
by a arias 11 Mar '11

11 Mar '11

I'm trying to setup the Janrain implementation of OpenID in a dev box running CentOS 5.5. The detect.php script is telling me, "Your web server seems to corrupt queries. Received , expected a=%26b. Check for mod_encoding." Does anyone know what package provides this? Thanks

1 0

mkswap - unable to relabel, operation not supported
by neubyr 10 Mar '11

10 Mar '11

Hi, I am getting following error on creating a swap fs. CentOS 5.5 {{{ mkswap: unable to relabel /srv/cloud/one/var/25/images/disk.1 to system_u:object_r:swapfile_t: Operation not supported }}} The selinux is configured in permissive mode. Any clues on what might be wrong here and how to fix it? {{{ # /bin/dd if=/dev/zero of=/srv/cloud/one/var/25/images/disk.1 bs=1 count=1 seek=512M # sudo /sbin/mkswap /srv/cloud/one/var/25/images/disk.1 Setting up swapspace version 1, size = 536866 kB mkswap: unable to relabel /srv/cloud/one/var/25/images/disk.1 to system_u:object_r:swapfile_t: Operation not supported # file /srv/cloud/one/var/25/images/disk.1 /srv/cloud/one/var/25/images/disk.1: Linux/i386 swap file (new style) 1 (4K pages) size 131071 pages }}} -- thanks, neuby.r

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Any reliable way to determine LVM snapshot creation time?
by Dr. Ed Morbius 10 Mar '11

10 Mar '11

We utilize LVM snapshots for some periodic maintenance. They're manually created and, usually, manually destroyed. But not always. So there's now a nightly script monitoring for open snapshots. Which raises the question of when a given snapshot was created. Absent good practices of, say, using sudo to create snapshots (leaving a /var/log/secure message), is there any reasonably reliable way to determine when an LVM was created? There's a timestamp on the /dev/mapper/<snapshot> file. I'm presuming that's somewhat useful for this purpose? Ah: just found /var/log/messages also indicates: lvm[2314]: Monitoring snapshot <name> lvm[2314]: No longer monitoring snapshot <name> ... which I think answers my own question. Posting here for Google's sake and/or discussion. -- Dr. Ed Morbius, Chief Scientist / | Robot Wrangler / Staff Psychologist | When you seek unlimited power Krell Power Systems Unlimited | Go to Krell!

1 0

Can anyone help me understand Apache Errors?
by Todd 10 Mar '11

10 Mar '11

LogWatch reports items like: Connection attempts using mod_proxy: 83.167.123.83 -> 205.188.251.1:443: 1 Time(s) 83.167.123.83 -> 64.12.202.36:443: 2 Time(s) Requests with error response codes 403 Forbidden 205.188.251.1:443: 1 Time(s) 64.12.202.36:443: 2 Time(s) 404 Not Found //jmx-console/HtmlAdaptor: 1 Time(s) /VINT_1984_THINK_DIFFERENT: 1 Time(s) /mobo.png: 1 Time(s) /player.swf: 1 Time(s) /robots.txt: 4 Time(s) Now, I know mod_proxy is turned off by default, but is there a way to "play games" with those that attempt a proxy connection? Like a ReWrite rule or some sort? For the 404's, Obviously these don't exist, but robots.txt so I am not sure why that has a 404. What are 406 errors? Some Googling say they are due to mod_security issues and that an .htaccess fix can turn it off. But I don't understand the issue and the solution to be honest. What am I missing? -Jason

2 1

Dell PERC H800 commandline RAID monitoring tools
by Dr. Ed Morbius 10 Mar '11

10 Mar '11

We're looking for tools to be used in monitoring the PERC H800 arrays on a set of database servers running CentOS 5.5. We've installed most of the OMSA (Dell monitoring) suite. Our current alerting is happening through SNMP, though it's a bit hit or miss (we apparently missed a couple of earlier predictive failure alerts on one drive). OMSA conflicts with mega-cli, though we may find that the latter is the more useful package. Both are pretty byzantine, the Dell stuff simply doesn't have docs (in particular: docs on how to interpret the omconfig log output). Ideally we'd like something which could be run as a Nagios plugin or cron job providing information on RAID status and/or possible disk errors. Probably both, actually. Thanks in advance. -- Dr. Ed Morbius, Chief Scientist / | Robot Wrangler / Staff Psychologist | When you seek unlimited power Krell Power Systems Unlimited | Go to Krell!

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