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Newbie Questions: Goal to make a customized minimal CentOS install CD
by EXT-Rodgers, Marianne 04 May '07

04 May '07

I have some basic questions, easy to most of you, I am sure. I have looked on the CentOS main site at the install manual, but am not finding my answers. Am I at the right place? I already know how to make install DVDs and CDs. I just need to know if there is things for the CentOS director, comps.xml updates, things like this for my customized DVD. I want to delete packages on my install DVD until I only have the rpms left that I want to use. Current questions: 1. Just how are the hdr (header) files used, and how do you update them? 2. How do I update the comps.xml file, and is this necessary ? 3. Why isn't /var/log/rpmpkgs on my prototype, which rpm or command makes it work? 4. Which files will update automatically when rpms are removed, and can I safely just remove RPMs from the CerntOS/RPM directory? I apologize in advance if this is not the right forum to ask these questions. I would be happy if directed to a proper site to find my answers. I have already googled, with little results. Marianne Rodgers PCS (Portable Computer System Group) Operating System Analyst United Space Alliance marianne.rodgers(a)boeing.com 281-244-4200 The comments & Opinions expressed are my own & do not represent the views of United Space Alliance

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Need help testing new mysql pkgs on c4 x86_64 -- Centosplus
by Devin Henderson 04 May '07

04 May '07

Hey guys. Evolution built some new mysql packages for c4-centosplus because I was seeing a bug. He has verified that the new packages fix the bug on i386 but I'm still seeing the bug on x86_64. I need some people who can test these packages in a c4 x86_64 environment to verify that the bug still exists. Just install mysql and mysql-server from here: http://dev.centos.org/centos/4/testing/x86_64/RPMS/ And then run the command 'mysql -u root -p < create.mysql.sql' using the create.mysql.sql file attached to the bug: http://bugs.centos.org/view.php?id=1975 If you get " ERROR 2013 (HY000) at line 61: Lost connection to MySQL server during query " and 'mysqladmin -u root -p version' shows that mysql has crashed and been restarted then the bug still exists. Thanks! Let me know what you find out. Cheers, Devin

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[PATCH] Fix xen bridge creation in multi-homed hosts
by Mike Fedyk 02 May '07

02 May '07

If a centos5 xen dom0 has one ip address, the default route line from "ip route list" has 5 fields. If the dom0 has more than one ip address, the default route line adds two more fields specifying the source ip address used for that route. This patch makes sure bridges are created properly in both cases. Mike Fedyk

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Updated packages for kmod-gfs-xen
by carlopmart 02 May '07

02 May '07

Hi all, Where are kmod-gfs-xen updated package for kernel 2.6.18-8.1.1 and kernel 2.6.18-8.1.3?? ftp redhat site has published src packages ... Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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More XFS Filesystem Tips
by Joshua Kramer 01 May '07

01 May '07

Hello All, This was posted to the Postgres Admin list - it has some valuable tips wrt XFS usage. I haven't had time yet to see if the C5 kernel conforms to what Hannes is talking about, but it looks like XFS is *very* picky about having hardware working correctly (and raid arrays set up correctly). Cheers, -J ---------- Forwarded message ---------- Date: Tue, 01 May 2007 16:35:28 +0200 From: Hannes Dorbath <light(a)theendofthetunnel.de> To: Adam Witney <awitney(a)sgul.ac.uk>, pgsql-admin(a)postgresql.org Subject: Re: [ADMIN] File systems linux !!! Adam Witney wrote: > Could you give a couple of examples of things that could be done wrong? I > have XFS running for my data partition, but I didn't really do much when I > set it up... > > Thanks for any advice 1.) Don't run XFS on any hardware that's not proven to be 100% fsync/fua safe. It's extremely unforgiving in that regard. Double check your raid controller settings and then test with something like http://www.faemalia.net/mysqlUtils/diskTest.pl 2.) Don't run it with a 4K stacks kernel. Though most issues with 4k stacks have been fixed long ago, there is an 4k stack fix in 2.6.21 release notes yet again. I just wouldn't trust it 100% yet. Especially avoid to run with 4k stacks in production if you are used to stack block devices on top of each other (LVM, EVMS, DRBD, GNBD etc). 3.) Use the deadline I/O scheduler, anticipatory and XFS don't like each other. This is true for almost any FS != ext3. This makes a difference especially for OLTP. 4.) Don't use stripe alignment unless you are 100% sure on how to calculate that numbers for your raid setup. No stripe alignment is always better than a wrong alignment. Some controllers don't like it at all and degrade in performance. 5.) Make sure to use write barriers unless you run on a hardware controller with BBU. Actually this is XFS default these days, but it gets disabled if you have any block device in your stack that doesn't support it. An example is DRBD (though write barriers are on the road map) 6.) Flushing data is the sole responsibility of the application. XFS does nothing to help broken applications, like ext3 can do with data=ordered or data=journal. XFS uses writeback exclusively. Don't run anything that does not conform to ACID on XFS. This is fine for PostgreSQL, but might not be fine for all your applications. 7.) Check dmesg for XFS messages and be able to interpret them. Especially something about "CORRUPTED_GOTO". If you see such a line chances are high that 1.) is not true. This is a cry from XFS to run xfs_repair ASAP, the file system was only mounted to keep your box online and will shutdown immediately if any suspicious position is accessed. Take XFS messages serious and Google for them if your are not sure what they mean. 8.) Grab all those nice PDFs at http://oss.sgi.com/projects/xfs/training/index.html These are essential readings for any XFS admin. IMHO XFS is a mature and rock stable file system, however your really need to obey the things above. It's just not the general-purpose-mkfs-and-forget-FS like what ext3 is claimed to be. What I recommend for a PostgreSQL production box is to use ext3 data=journal for / and XFS for $PGDATA. This should give you a system which really behaves nice on power failures. ext3 data=journal for all non ACID applications, XFS for ACID applications. Personally I use XFS on / as well, but I have taken some steps to make it behave like I wish. -- Best regards, Hannes Dorbath ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend

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CensOS5-server
by Filip Bartmann 30 Apr '07

30 Apr '07

Will be released CentOS 5 Server and/or LiveCD? If yes, when will be available? Thanx, Filip Bartmann

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Re: [CentOS-devel] XFS module ... big troubles
by Gernot Stocker 29 Apr '07

29 Apr '07

On Tuesday 24 April 2007, Jim Perrin wrote: > Okay. Why are you rebuilding, rather than use the already compiled > version in the repository? Especially with such crucial things like kernel I like to be able to react on my own if there are arising security issues not fixed by the upstreram distro in time. Therefore I like the idea of at least beeing able to rebuild the kernel on my own if I have to. > While you should in theory be able to rebuild the module and have it work > just fine, sometimes there are issues with the build environment that are > difficult to track down. That's strange because we didn't change anything regarding the build environment. It is a plain Centos 5 installation from scratch using the DVD iso image. Beside some configuration regarding iptables and NFS service NOTHING was been changed. > > Do you get the same results with the precompiled modules? > I will try it tomorrow evening because we need the image server today for a bunch of new installations. Luckky us that ext3 is working ;-) As soon as the student rooms are installed I will test the precompiled module and come back to the list with the results. > I don't use xfs that extensively on i686 hardware because I don't > trust the 4k stack limitation issue, but a quick run-through with the > pre-built modules, and I don't seem to have this issue. (moved a > bunch of copies of the centos-5 dvd around, on and off the fs, > md5suming each time) That doesn't make me feel better ;-) We wanted to migrate a machine with almost 7000 user homes on XFS to CentOS 5 and I'm now a "little" bit scared unless we can't track down the problem. Thanks for your hints, Gernot -- Gernot Stocker, Institute for Genomics and Bioinformatics(IGB) Petersgasse 14, 8010 Graz, Austria Tel.: ++43 316 873 5345 http://genome.tugraz.at

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CentOS booth at LinuxTag 2007, Berlin, Germany
by Dag Wieers 28 Apr '07

28 Apr '07

Hi all, The CentOS team is preparing for LinuxTag 2007 on: Wed 30 May 2007 until Sat 2 June 2007 in Berlin, Germany We have a wiki page dedicated to LinuxTag 2007 at: http://wiki.centos.org/Events/LinuxTag2007 If you're interested to help out organising this event, subscribe to our new promo mailinglist at: http://lists.centos.org/mailman/listinfo/centos-promo And if you were planning to go to LinuxTag, please pay us a visit. We're very interested to meet and discuss future development and exciting new ideas. This is a perfect opportunity to connect CentOS team-members and CentOS users. Hope we can meet at LinuxTag 2007 ! -- dag wieers, dag(a)wieers.com, http://dag.wieers.com/ -- [all I want is a warm bed and a kind word and unlimited power]

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New mailing list: CentOS-Promo
by Ralph Angenendt 25 Apr '07

25 Apr '07

Ladies and Gentlemen, we, the CentOS Project, are proud to invite you to our newest mailing list: CentOS-Promo. This list is for the discussion of Events, Gatherings and (LUG)Meetings where CentOS will or should be presented. Should *you* join this mailing list? Yes, if - you want to help out at events - you want to present CentOS at your LUG - you have great ideas for marketing material to promote CentOS - you are interested in doing promotion for CentOS - you know about events where CentOS should be (re)presented - you want to invite CentOS developers to your LUG/Event (you want to pay travelling costs, don't you? >:) ) - you want to know where CentOS will be presented next So go ahead, subscribe to this list and help us spread the word! CentOS is good for you! We know we will see you on that mailing list soon. Just point your browser to <http://lists.centos.org/mailman/listinfo/CentOS-Promo> and join us! Be seeing you there, Ralph

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XFS module ... big troubles
by Gernot Stocker 24 Apr '07

24 Apr '07

Hi CentOS developers, first of all congrats for the CentOS 5 release! I'm using on several production servers xfs as file system and would like to migrate them from CentOS 4.4/FCx to CentOS 5. I tried for a low priority image server the module downloaded from the site below: http://dev.centos.org/centos/5/testing/SRPMS/xfs-kmod-0.3-2.2.6.18_8.1.1.el… The results have been completely destroyed image files. It was quite strange that small files remaind fine whereas bigger files auf more than 1GB have been destroyed. Has anybody else made similar experiences using this module? Any hints how this problems could be solved? Thanks Gernot -- Gernot Stocker, Institute for Genomics and Bioinformatics(IGB) Petersgasse 14, 8010 Graz, Austria Tel.: ++43 316 873 5345 http://genome.tugraz.at

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