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4653 discussions

PXE Boot CentOS 5.5 Live CD
by Krishnaprasad_K＠Dell.com 23 Jun '10

23 Jun '10

Hello, This is regarding a query w.r.t CentOS 5.5 Live CD Bootup from PXE server. From the CentOS LiveCD project webpage, i do see that PXE booting of CentOS live CD is pretty simple as the ISO image itself is carried inside the initrd. I downloaded the "livecd-tools-014-8.src.rpm" from CentOS repositories and created a new initrd image ( which contains Live ISO image ) using "livecd-iso-to-pxeboot.sh" script. # ./livecd-iso-to-pxeboot.sh CentOS-5.5-i386-LiveCD-Release2.iso This creates a new initrd by incorporating the ISO image ( live ISO image ) with the existing initrd present in the live CD ISO image. But when i use this updated initrd from PXE server, it says "Boot failed...press a key to retry or wait to reset..." Here is the PXE entry:- kernel vmlinuz0 APPEND initrd=initrd0.img root=/CentOS-5.5-i386-LiveCD-Release2.iso rootfstype=iso9660 rootflags=loop 3 - where vmlinuz0 is the kernel image present in the CentOS iso and initrd0.img is the updated initrd image created using the script ( livecd-xxx-pxe.sh ). i.e. CentOS live ISO initrd with ISO image. When the /tftpboot/pxelinux.cfg/default is updated with the above entries, then server gets restarted and in the next boot up system shows an error, i.e. "Alert ! System fatal error during previous boot" any one have experienced same issues? Thanks in Advance ! - Krishnaprasad

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DRBD again...
by Joseph L. Casale 22 Jun '10

22 Jun '10

A while we discussed dropping the old drbd packages out of the repo. I have a two node cluster I rolled from the same ks file and built rpms from a supported version of drbd using their trivial and well documented method, so when I needed help, I could get it:) During a `yum update` on only "one" node, it wants to replace drbd.x86_64 8.3.7-1 with drbd82? Uh, ok... I don't have the genuine skill to manage packages for a repo of such importance like a CentOS repo, but an abandoned package is of equal harm. When a user installs those and then goes to the drbd list for help I suspect he would get the same reply if he installed CentOS 5.0 then encountered an issue and asked for help. Fair? The list of fixes from 8.2.x to current is long. Given the package building is so well done for drbd, by Linbit, does it make sense to duplicate their effort and simply make work for the maintainers of this repo? Thanks guys, jlc

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Forum Post: "Lance Davis Question..."
by Alan Bartlett 21 Jun '10

21 Jun '10

There has been a recent forum post with the subject header as quoted, above. [1] I feel that it would be best answered by one of the Core Development Team. Of all the usual people that I would consider to ask to craft a suitable response, I think Russ would be the most appropriate person. So, grandchildren permitting, a sentence -- or even a paragraph -- would be appreciated, please. Regards, Alan. [1] http://www.centos.org/modules/newbb/viewtopic.php?topic_id=26780&forum=14

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CentOS Artwork Repository (tagged revision 0.0.1)
by Alain Reguera Delgado 18 Jun '10

18 Jun '10

Hi Guys, I would like to share with you the 0.0.1 tagged revision of CentOS Artwork Repository. The CentOS Artwork Repository, as it comes inside 0.0.1 tagged revision, is a tool where graphic designers, translators and programmers do their best to automate image production used to build a monolithic corporate visual identity for the CentOS project. As final goal we have in mind to automate image rendering for many languages, many major releases, and different artistic themes; in a way that people building rpms (or anything that needs images) could use the artwork rendering process. This, in order to give one step forward onto CentOS automation. The CentOS Artwork Repository 0.0.1 tagged revision is a preview of what we are doing to automate CentOS artwork production. It is a work in progress and surely many things need to be corrected. If you are interested on CentOS Artwork, download the following file: http://wiki.centos.org/ArtWork?action=AttachFile&do=get&target=centos-artwo… test it on your workstation, report bugs, and make suggestions. It is possible that 0.0.1 tagged revision structure be reflected inside https://projects.centos.org/svn/artwork, which is the CentOS Artwork Repository standard location. Best Regards, al.

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Artwork pre-prep for v6
by Marcus Moeller 17 Jun '10

17 Jun '10

Hi all, as already stated in IRC I am going to start pre-preparation of a new artwork for v6. This will include a custom Plymouth theme as well as wallpaper and icon packages. If one wants to complain, do it now, please. Otherwise I will just go ahead. Best Regards Marcus

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Debuginfo packages not signed
by Phil Schaffner 15 Jun '10

15 Jun '10

Just noticed that (at least some - e.g. CentOS-5 kernel-debuginfo, kernel-debuginfo-common, aspell-debuginfo) debuginfo packages are not signed. Started to file a bug entry, but don't know if it is merited. Is the intent to have these packages signed? The Debuginfo Wiki page shows "gpgcheck=1". http://wiki.centos.org/AdditionalResources/Repositories/DebugInfo Phil

3 3

LiveCD suggestion
by Phil Schaffner 07 Jun '10

07 Jun '10

For the next iteration of the LiveCD I would suggest omitting the netinstall option. This has caused a rather large support load on the fora (or forums if you prefer) from people who can't get it to work. As netinstall is really most useful with a "perfect" network connection or local archive, and can be tricky to get right, it is just confusing a lot of the LiveCD "market segment". More sophisticated users will just grab the netinstall CD or use images/boot.iso. Removing it would also leave more room for useful apps. Phil

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Forum overhaul
by Monte Milanuk 31 May '10

31 May '10

Hello all, As an end user, I would like to know if there is any forward progress on doing something about the CentOS forums? This apparently has came up time and again, with various examples being given of the deficiencies of the existing setup (depending on your point of view). As near as I can tell the general consensus seems to be 'yes, something needs to be done'... and thats about as far as it gets. I realize everybody has lots on their plate, but this has been languishing for a year or more, with no apparent changes being made. For a self-proclaimed 'enterprise' OS, the associated support forum doesn't make much of a first impression. http://www.centos.org/modules/newbb/viewtopic.php?topic_id=14921&forum=18 http://lists.centos.org/pipermail/centos-devel/2008-September/003366.html https://www.centos.org/modules/newbb/viewtopic.php?topic_id=23201&start=0#f… http://lists.centos.org/pipermail/centos-devel/2009-December/005252.html What needs done? What needs decided? Whose backside needs a fire lit under it? What can *I* do? Monte

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Awaiting C-5 Updates.
by Alan Bartlett 29 May '10

29 May '10

Hi KB, Some users are getting restless [1]. Would you like / do you have the time to post to that thread, please? If negative, may I have a comment from you that I can post on your behalf. Thanks, Alan. [1] http://www.centos.org/modules/newbb/viewtopic.php?topic_id=26452&forum=37

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disk i/o stalls with mptsas since upgrade to centos 5.4
by Lennert Buytenhek 27 May '10

27 May '10

Hi! On two different machines, I've been experiencing disk I/O stalls after upgrading to the CentOS 5.4 kernel. Both machines have an LSI 1068E MPT SAS (mptsas) controller connected to a Chenbro CK13601 36-port SAS expander, with one machine having 16 1T WD disks hooked up to it, and the other having a mix of about 20 WD/Seagate/Samsung/Hitachi 1T and 2T disks. When there's a disk I/O stall, all reads and writes to any disk behind the SAS controller/expander just hang for a while (typically for almost exactly eight seconds), so not just the I/O to one particular disk or a subset of the disks. The disks on other (on-board SATA) controllers still pass I/O requests when the SAS I/O stalls. I hacked up the attached (dirty) perl script to demonstrate this effect -- it will read /proc/diskstats in a tight loop, and keep track of which request entered the request queue when, and when it completed, and it will WTF if a request took more than a second. (The same thing can probably be done with blktrace, but I was lazy.) New requests get submitted, but the pending ones fail to complete for a while, and then they all complete at once. This happens on kernel-2.6.18-164.11.1.el5, while reverting to the latest CentOS 5.3 kernel (kernel-2.6.18-128.7.1.el5) makes the issue go away again, i.e. no more stalls. It doesn't seem to matter whether the I/O load is high or not -- the stalls happen even under almost no load at all. Before I dig into this further, has anyone experienced anything similar? A quick google search didn't come up with much. thanks, Lennert #!/usr/bin/perl -w use Time::HiRes qw(clock_gettime CLOCK_MONOTONIC); sub read_stats { local *STATS; my %stats; %stats = (); open STATS, "< /proc/diskstats"; while (<STATS>) { my @fields; chomp; @fields = split; if ($fields[2] =~ /^sd[a-z]$/) { my $head = $fields[3] + $fields[7]; my $tail = $head + $fields[11]; $stats{$fields[2]} = [ $head, $tail ]; } } close STATS; return \%stats; } my %heads; my %queues; %heads = (); %queues = (); while (1) { my $now; my %stats; my $disk; $now = clock_gettime(CLOCK_MONOTONIC); %stats = %{read_stats()}; foreach $disk (sort keys %stats) { my $head; my $tail; next if ($disk eq "sda"); $head = $stats{$disk}->[0]; $tail = $stats{$disk}->[1]; if (not defined $heads{$disk}) { print "new disk $disk\n"; $heads{$disk} = $head; $queues{$disk} = []; } while ($heads{$disk} + scalar(@{$queues{$disk}}) < $tail) { push @{$queues{$disk}}, $now; print "$now: $disk add -> " . scalar(@{$queues{$disk}}) . "\n"; } while ($heads{$disk} < $head) { my $s; $heads{$disk}++; $s = int(1000 * ($now - (shift @{$queues{$disk}}))); if ($s > 1000) { print "WTF on " . localtime(time()) . " for $s ms\n"; } print "$now: $disk remove after $s ms -> " . scalar(@{$queues{$disk}}) . "\n"; } } }

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