Discuss October 2006

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260 participants
296 discussions

Seg fault, please help
by Devraj Mukherjee 16 Oct '06

16 Oct '06

Hi Everyone, I found these in my log files. I am running the latest version of gs, as distributed by CentOS Oct 11 18:03:27 charlie kernel: gs[9960]: segfault at 0000000000000000 rip 0000003f0cd2063e rsp 0000007fbfffe090 error 6 Oct 12 14:40:58 charlie sshd(pam_unix)[12919]: session opened for user root by root(uid=0) Oct 13 15:16:11 charlie kernel: gs[16302]: segfault at 0000000000000000 rip 0000003f0cd2063e rsp 0000007fbfffe090 error 6 Oct 13 18:10:58 charlie sshd(pam_unix)[17189]: session opened for user root by root(uid=0) Kernel details Linux charlie.networketernity.com 2.6.9-42.0.2.plus.c4smp #1 SMP Sat Aug 26 12:53:43 CDT 2006 x86_64 x86_64 x86_64 GNU/Linux Please let me know if I should be panicing about this. -- "I never look back darling, it distracts from the now", Edna Mode (The Incredibles)

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YUM needs older version
by Todd Cary 15 Oct '06

15 Oct '06

Sorry to bring this topic up again, but I am confused as to why yum needs an older version and how to resolve the problem. I get this error from yum: Error: Missing Dependency: httpd = 2.0.52-22.ent.centos4 is needed by package httpd-manual Error: Missing Dependency: libgcj = 3.4.5 is needed by package libgcj-devel Since most of this is outside my skill set, I am not sure if "yum resolvedep httpd" is the correct way to determine what is present, nevertheless, I got httpd-2.0.52-28.ent.centos4.i386 and libgcj-3.4.6-3.i386 for libgcj. That appears to be telling me that I have newer versions of both currently installed. Is that try? How can I resolve the problem? Todd -- Ariste Software 2200 D Street Ext Petaluma, CA 94952 (707) 773-4523

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smbmount: mount() syscall gone bad ?
by Rodrigo Barbosa 14 Oct '06

14 Oct '06

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I have seen a weird problem in one of my clients. The reported that when issuing a smbmount command (both client and server are CentOS 4.4), it would take up to 30 second for the mount to complete. To make a long history short, by using strace and the source, I noticed smbmnt is first calling mount() using ascii options for *data. Then that would timeout, and it would try again using a struct, finally working. Looking at the source code, it will first try ascii if kernel >= 2.4, and fallback to struct if it doesn't work. So changing smbmnt.c to always using the struct first solved my problem. I also noticed that debian will always go first for the struct aproach. Anyone seen this before ? - -- Rodrigo Barbosa "Quid quid Latine dictum sit, altum viditur" "Be excellent to each other ..." - Bill & Ted (Wyld Stallyns) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) iD8DBQFFKmyrpdyWzQ5b5ckRAnq4AJ9Z2ZCe3denIoWFK5ePWF7INHqMjwCgs+9c bNCRI/9fJ9B1Cg2gGD4hPHM= =Qa4R -----END PGP SIGNATURE-----

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automatic shutdown of UPS (and RAID1)
by Ben 14 Oct '06

14 Oct '06

I have an MGE UPS Pulsar Ellipse 600 USBS that I'm setting up with CentOS 4.4 I tried for some time to get it working with USB, but failed and I have had much more success using the serial port. I have managed to complete the whole install procedure (shown here: http://www.networkupstools.org/doc/2.0.1/INSTALL.html )but I'm lost when it comes to implementing the shutdown script. I'm also using Software RAID1 for all partions (/, /boot, swap, and two others). I've never edited shutdown scripts before and after a few days of Googling and manual reading I'm still not sure what to do. Is it as simple as just putting the script in a file in the rc0.d directory? I'm not sure what the file should be named so the script is run at the right time, and I don't know how to ensure the software RAID1 is ready to be powered off. Feel free to tell me to RTFM, just let me know which FM I should be looking at. :-) Here's the step I'm stuck on: 11. Edit your shutdown scripts: add upsdrvctl shutdown You should configure your system to power down the UPS after the filesystems are remounted read-only. Have it look for the presence of the POWERDOWNFLAG (from upsmon.conf), using this as an example: if (test -f /etc/killpower) then echo "Killing the power, bye!" /usr/local/ups/bin/upsdrvctl shutdown sleep 120 # uh oh... the UPS power-off failed # you probably want to reboot here so you don't get stuck! # *** see the section on power races in shutdown.txt! *** fi Be careful: that upsdrvctl command will probably power off your machine. Don't use it unless your system is ready to be halted by force. If you run RAID, be sure the arrays are ready to lose power. Your kernel's power-off routines may not execute. Make sure that the filesystem(s) holding your UPS drivers and configuration details are still mounted when that part of the script is run. You need upsdrvctl, ups.conf, and any drivers for the hardware on your system. --- Ben

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IP addressing migration
by Ivan Arteaga 14 Oct '06

14 Oct '06

Hi, I am changing the IP addressing in my centOS server which works as mail server. The question I have is, if I define the new IP addresses (sub-interfaces) on the server, can I work with both ranges at the same time despite I have only one default gateway configured? (on the old range) Or may I have two default gateways in centOS? --Ivan. -------------------------------------------------- Ivan Arteaga Grupo Regency Senior Network Consultant Phone: +507 205-8307 Email: <mailto:iarteaga@plazareg.com> iarteaga(a)plazareg.com <mailto:ivan.arteaga@sisa.com> ivan.arteaga(a)sisa.com "Look both ways before crossing the Net"

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migrating servers (advice)
by Ajay Sharma 14 Oct '06

14 Oct '06

Hi, I'm about to copy the contents of one server onto another. The "plan" that I've come up with is: 1) boot the new server with a live disc, partition accordingly 2) a big tar-over-ssh for the /boot, and root partitions (that's all there is) 3) adjust the fstab so that it'll find the new scsi partitions vs. the old ATA ones. 3) then chroot into the new system and run grub to initialize the bootloader. I'm switching a server from a single HD to a SCSI mirror on our new machine. So it has a different partition setup and I don't want to mess with resizing. Does that sound about right to get the machine booted? I'm sure there will be some other minor things but I can sort that out once I get the data over and the machine booted. --Ajay -- Satyajot (Ajay) Sharma REVShare System Administrator

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Re: [CentOS] Training Material: Books about linux but targeting Centos installations
by TimJowers＠Yahoo.Com 14 Oct '06

14 Oct '06

Erick, You need to contact Servin. Bar none they have the absolute best training manual for CentOS/RHEL. I have used it to teach before. Each chapter is a series of steps for the particular topic. Combine this with a theory book such as "Understanding the Linux Kernel" and some time on the computer and your students will walk out transformed. They have a book for admin, for Linux for tech pros, for Linux and BIOS, Linux Kernel, and some others I think. . http://www.servin.com/ TimJowers ----- Original Message ---- From: DM <mamwake(a)yahoo.com> To: CentOS mailing list <centos(a)centos.org> Sent: Friday, October 13, 2006 1:07:04 AM Subject: Re: [CentOS] Training Material: Books about linux but targeting Centos installations --- Erick Perez <eaperezh(a)gmail.com> wrote: > Hi, > I am about to give a training session in Linux, > using Centos 4.4 as a base. > I want to give my students (MS windows > administrators) printed books about > Linux and hopefully Centos based. It is a total of > 20 books. I'm also > interested in purchasing 20 copies of the DVD of > Centos 4.4 x86/x86_64 > distro. > > My initial search at amazon returned no useful > results. > > It can be RHEL 4, Centos 4 or fedora 4 based but I > really want them to be > Centos if possible, given the fact that I often > scracth RHEL intallations in > favor of Centos (i know is the same base, but I > would like to match the book > with the distro). > The books have to be focused to Linux administration > and installation (like > web,ssh.mail.etc). There is no need to cover > in-depth programming > (perl,bash,etc). > > Can anyone in the Centos community have some > references of these books/DVDs > for purchase? I have very good manual, geared to RHCE if you are interested contact me off-list.! > Thanks, > > > > -- > ------------------------------------------------------------ > Erick Perez > Panama Sistemas > Integradores de Telefonia IP y Soluciones Para > Centros de Datos > Panama, Republica de Panama > Cel Panama. +(507) 6694-4780 > ------------------------------------------------------------ > > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

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Safely updating to 4.4 via yum (chicken)
by techlist 14 Oct '06

14 Oct '06

Hi guys: I saw the pelthora of threads where people had trouble moving to 4.4. So I'm chicken now and I was trying to wait for the dust to settle, I suppose it has and its been long enough I'm nervous about not upgrading. I need to do a a production server that is located in a data center far away so even more than normal I want a smooth upgrade. Can someone tell the what the concensous was on the best way to do the upgrade and avoid problems. From my notes I got: yum upgrade python-sqlite yum upgrade sqllite yum upgrade yum yum clean all yum update But at least one guy said his box was still hosed with duplicates and a broken bind after that. What's the method to upgrade 4.3-> 4.4 with the highest change of sucess? Thanks very much for the help. Scott

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Write performance with 3ware 9550
by Bowie Bailey 13 Oct '06

13 Oct '06

I have two identical servers. The only difference is that the first one has Maxtor 250G drives and the second one has Seagate 320G drives. OS: CentOS-4.4 (fully patched) CPU: dual Opteron 280 Memory: 16GB Raid card: 3ware 9550Sx-8LP Raid volume: 4-disk Raid 5 with NCQ and Write Cache enabled On the first server I have decent performance. Nothing spectacular, but good enough. The second one has about 1/3 the write speed. I can't find any difference between the systems. Both of them have the same stripe size, both have ext3 filesystems, both have write caching and NCQ turned on. I have already increased the read ahead setting to 16384 on both servers. I ran the tests like this: # sync; bonnie++ -d /iotest -s 50g -n 0 -b -f (I have removed some extra information from the reports for brevity) And here are the results for the two servers: ------Output------- --Input-- --Block-- -Rewrite- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP /sec %CP First 50G 62893 25 46763 12 160672 19 120.6 1 Second 50G 18835 7 44025 12 194719 24 122.8 1 As you can see, the write performance of the second server is terrible. Anyone have any suggestions of what I can look for? I keep thinking there must be something I tweaked on the first server that I forgot about for the second one, but so far I haven't been able to find it. Any suggestions appreciated! -- Bowie

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Apache DirectoryIndex
by Kirk Bocek 13 Oct '06

13 Oct '06

I'd like to change the DirectoryIndex document for just the DocumentRoot, leaving the default DirectoryIndex setting for all other directories. However, when I set DirectoryIndex in the <Directory "/var/www/html"> section of /etc/httpd/conf/httpd.conf it seems to set it for *all* directories. DirectoryIndex doesn't seem to be allowed in .htaccess either. Does anyone know how to set this? Thanks, Kirk Bocek

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Discuss October 2006