Discuss September 2007

discuss@lists.centos.org

265 participants
310 discussions

recompiling httpd
by Matthias Leopold 04 Sep '07

04 Sep '07

hi, i'm trying to recompile the httpd rpm on a x86_64 system. all i've changed in the spec file is the "--with-suexec-docroot" configure option. the error message i get from the "rpmbuild -ba SPECS/httpd.spec" command is "ln: creating symbolic link `/var/tmp/httpd-root/etc/httpd/logs' to `../../usr/var/log/httpd': No such file or directory". so what do i do now? thx matthias -- Mit freundlichen Grüssen Matthias Leopold System & Network Administration Streams Telecommunications GmbH Universitaetsstrasse 10/7, 1090 Vienna, Austria tel: +43 1 40159113 fax: +43 1 40159300 ------------------------------------------------

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NIS/Samba update
by Scott Ehrlich 04 Sep '07

04 Sep '07

My test setup consists of Enterprise 5 server running NIS and Samba, and dual-boot XP and CentOS 5 clients. On my test setup, I'm able to create new samba accounts and change samba passwords with no problems. NIS still gives me problems, though. I am unable to change passwords no matter what. Also, ypwhich on the client returns localhost. I have reviewed everything, including configs of other networks that are live, and cannot figure out where the problem is. I believe that once I can password changed effortlessly on the NIS side, I can implement this on the live system. Until NIS account passwords can be changed at-will, this setup won't go to production. So, what might I be missing? Why can't I change passwords? Also, what would cause the client, when issued ypcat passwd, to not show the newer accounts create by the server, even after a /var/yp make has been issued? Both client and server have been rebooted many times. Thanks. Scott

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Performance Issues
by Dan Dansereau 04 Sep '07

04 Sep '07

My apology for cross posting We have a DELL6850 with 8Gbytes of memory, four 3.2Ghz CPU's , perc 4 raid controller, with fourteen 300Gbyte 10Krpm disk on a powervault 220s, And a powervault 124T LTO-3 tape systems on a separate 160Mbyte/sec adaptec SCSI card. The disks are configured as two 2Tbyte raid 0 partitions using the perc 4 hardware. The problem is - reading from the disk, and writing to the tape is pathetically slow. The specs say I should get around 80Mbyte/second - in reality - is about 500 Kbytes/second Writing just to tape, using /dev/zero as input and dd to write, I can get up to 60Mybte/second, indicating that the tape drive and scsi card is functional from a hardware perspective. Since I can read and write data to the disks - I assume that they are functional. The files are 80Mybtes for the minimum size that I am writing to tape. DELL Support hides behind the fact that CENTOS is not a supported OS, But RED HAT is - so switch to it, so DELL can get RED HAT Support involved. And the fact that Rocks is a modification to an unsupported OS.... I have tried using various block size in tar from 256 to 8192 - with minimal success. Does anybody have any experience on setting the OS/Kernel parameters to utilize the hardware at something more then a snails pace? Or Suggestions on what I could test and/or try? Or Is there a standard disk / tape IO test package that could test the speed/performance of the disks and /or tapes? Thanks for your help Dan A. Dansereau

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Re: [CentOS] RAID + LVM Addition to CentOS 5 Install
by Nick Webb 04 Sep '07

04 Sep '07

On 9/4/07, Nick Webb <webbn(a)acm.org> wrote: > On 9/4/07, Shad L. Lords <slords(a)lordsfam.net> wrote: > > > This worked fine, but on reboot I get a ton of errors from LVM saying > > > that volume with id xxxx-xxxx-xxxx... was not found and the system > > > automatically reboots. This seems to happen for all volumes, not just > > > the ones I changed. This error even happens for a separate volume > > > group (called 'extended') that is on a separate set of disks and was > > > existing prior to the CentOS 5 install. > > > > > > Any idea on some step I missed? I know things are still fine on the > > > disks, as when I boot with the CentOS DVD with the 'linux rescue' > > > option all RAID & LVM volumes are available for use. So from this it > > > seems I need to update some CentOS config file? > > > > Did you re-create the initrd after adding the new raid group? Not 100% > > about this but my guess would be that the initrd isn't starting md2 and thus > > can't find the pv on that raid device. > > > > -Shad > Hi Shad, That solved it! Thanks so much for the help. Awesome group on here, BTW, 4 responses within a hour or two of my post, and a solution! Nick

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RAID + LVM Addition to CentOS 5 Install
by Nick Webb 04 Sep '07

04 Sep '07

Hi All, I have what I believe to be a pretty basic LVM & RAID setup on my CentOS 5 machine: Raid Partitions: /dev/sda1,sdb1 /dev/sda2,sdb2 /dev/sda3,sdb3 During the install I created a RAID 1 volume md0 out of sda1,sdb1 for the boot partition and then added sda2,sdb2 to a separate RAID 1 volume as well (md1). I then setup md1 as a LVM physical volume for volume group 'system'. I left the sda3,sdb3 partitions available for future use. Next I created swap, /, /usr, /var, etc. logical volumes in the system volume group and continued with this install as normal. Everything went fine. I was able to use the system, reboot, etc., without problems. I then discovered that I needed more space in my /var volume than was available in the system volume group. So, I created another RAID device, /dev/md2 (using sda3,sdb3), and created an LVM physical volume on top of that. Finally, I extended the system physical volume to contain this new physical volume and expanded the size of the /var volume. This worked fine, but on reboot I get a ton of errors from LVM saying that volume with id xxxx-xxxx-xxxx... was not found and the system automatically reboots. This seems to happen for all volumes, not just the ones I changed. This error even happens for a separate volume group (called 'extended') that is on a separate set of disks and was existing prior to the CentOS 5 install. Any idea on some step I missed? I know things are still fine on the disks, as when I boot with the CentOS DVD with the 'linux rescue' option all RAID & LVM volumes are available for use. So from this it seems I need to update some CentOS config file? Here are some config files: http://pastebin.com/m6d5075dc Thanks! Nick

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Using HTTP proxy for yum
by Scott Moseman 04 Sep '07

04 Sep '07

Is there a way to use an HTTP proxy (with a user/pass) with yum? Or at least a way to pass a user/pass through yum? I have a situation with a CentOS server behind a web filter appliance. Thanks, Scott

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Re: [CentOS] Re: OT: Suggestions for RAID HW for 2 SATA drives in
by Lanny Marcus 04 Sep '07

04 Sep '07

On 31 August 2007, Phil Schaffner <Philip.R.Schaffner(a)NASA.gov> wrote: > > Message: 21 > <snip> > > As discussed recently on-list, VMware CPU requirements to support > > virtualization are not nearly so rigorous as for Xen. You are > > probably OK with VMware on most any relatively modern x86 or x86_64 > > CPU. > > http://lists.centos.org/pipermail/centos/2007-August/085796.htmlg. http://www.vmware.com/products/server/?urlcode=yahoo_ssp Phil: That's very cool! The largest free space I have on my HD is about 5.3 GB. Can I create a new partition there and try VMware Server? TIA, Lanny

2 1

grep
by Scott McClanahan 04 Sep '07

04 Sep '07

Not a CentOS specific question, although I am running grep on CentOS 4.3 but how would you grep out a series of lines in a file starting at a specific point. For instance, if I have a file named foo and I want to grep out the next 5 lines after the first and only instance of the string "bar" how could I pull that off? Thanks so much.

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ftape on centos5?
by Dave 03 Sep '07

03 Sep '07

Hello, Does anyone have the ftape driver working with a centos5 machine, specifically with a 2.6.18-8.18-8.el5 centosplus kernel? I've got a situation where it is needed and haven't been able to find anything related to kernels beyound 2.1 on it, not sure if that's still current, if not i'd appreciate any suggestions. Thanks. Dave.

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how to tst my backup mail server
by Mail Administrator 03 Sep '07

03 Sep '07

Dear ALl, Sorry for my posting here but do apprecite if u guys help me.. I have already CenOS 5 and been used as my Primary DNS and primary sendmail mail server and is working perfectly fine i also have another Centos MAchine being used as my secondary DNS server and been workin fine.. i want to use this machine as my backup mail server and has gone to the DOCS have configured DNS and sendmail for a backup mail server. but i really dont know how i would test if my secondary mail server is workin apprecite if you cd have some examples or steps to check my newly setup backup mail server Thanks and Regards simon -- Network ADMIN: -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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Discuss September 2007