devel March 2010

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Fasttrack for C-5
by Alan Bartlett 03 Dec '10

03 Dec '10

Karanbir, Is there an ETA for this repository yet? A status update would be appreciated, please. Regards, Alan.

10 33

'yum-security' plugin and fasttrack respository for CentOS 5.4
by Alan Bartlett 24 Jun '10

24 Jun '10

Yesterday evening (Tuesday December 8, 2009) a forum thread [1] was started by Stefan (under the ID of "gigglesworth") relating to the above subjects. As is well known, ELRepo provided the fasttrack packages during the lifetime of CentOS 5.3 but following on from Karanbir's assertion that CentOS will provide the fasttrack packages for 5.4 we, at ELRepo, have stepped down from providing that service. Will CentOS-devs please have a look at the above mentioned thread and then respond, accordingly, to the OP. Regards, Alan. [1] http://www.centos.org/modules/newbb/viewtopic.php?topic_id=23695&forum=42

3 5

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"; } } }

4 6

Talk about existing forums
by Karanbir Singh 07 May '10

07 May '10

hi guys, One of the things that came up from the last chat about the language specific websites, was that there was no one on that call who actually used the forums. With the help of Akemi, I've been able to setup a meeting for the existing english forum moderators to come together and have a chat about: 1) what we have right now 2) Whats broken 3) whats really good 4) where they would like the forums to be in the next 6 months 5) Where they would like the forums to be in the next 12 months 6) The idea of 'English' as being just another language Its a bit short notice, but the meeting is setup to happen on Wednesday 9th Dec at 2300 UTC. Its the only time that worked for all concerned - in the next few weeks period. Apart from the existing forum moderators, anyone interested in the conversation is more than welcome to come along. Lets all sync up at 22:50 on #centos-devel(a)irc.freenode.net and take it from there. Also, lets try and timebox initial discussion to 40 min with a further 10 min after that to summarise and plan future actions. - KB

10 32

centos support for Red Hat Enterprise MRG for RHEL-5
by Farkas Levente 15 Apr '10

15 Apr '10

hi, is there any plan to support/rebuild packages from "Red Hat Enterprise MRG for RHEL-5" for centos? regards. -- Levente "Si vis pacem para bellum!"

3 3

Updates to drbd-related packages
by Akemi Yagi 14 Apr '10

14 Apr '10

On Thu, Mar 11, 2010 at 9:49 AM, Joseph L. Casale <jcasale(a)activenetwerx.com> wrote: >>> Funny, there was just a thread on the extra repo's drbd packages today >>> in the drbd list. Given those packages have bugs and are not really >>> maintained, along with the fact of how easy it is to make rpm's directly >>> from source (lacking kmod though) might it be wise to drop them? >>I saw a brief discussion on this subject (maintaining drbd etc) on the >>centos-devel IRC channel not long ago. Maybe this matter should be >>discussed in the -devel mailing list ?? I would like to hear from >>core CentOS devs. > As suggested, I am posting here to get the dev feedback, clearly having > kmods is a much better solution than linbits approach, but the existing > bugs will likely catch most new uses off guard. I have edited the subject line to make clear what we are going to discuss. :D I remember the major work of the last update was done by Ralph with extensive help from Fabian and other community members. I hope they can continue the effort. :) Akemi

6 16

Desktop/Workstation GNOME/KDE DVD install kickstart
by Phil Schaffner 06 Apr '10

06 Apr '10

Per Karanbir's request on Planet CentOS, below is an anaconda-ks.cfg from an install as in the Subject: -------------------------------------------------------------------- # Kickstart file automatically generated by anaconda. install cdrom lang en_US.UTF-8 keyboard us xconfig --startxonboot network --device eth0 --bootproto dhcp rootpw --iscrypted $1$1jBzy9QU$Dtyah.fFghDGGPQPlibt10 firewall --enabled --port=22:tcp authconfig --enableshadow --enablemd5 selinux --enforcing timezone America/New_York bootloader --location=mbr --driveorder=sda --append="rhgb quiet" # The following is the partition information you requested # Note that any partitions you deleted are not expressed # here so unless you clear all partitions first, this is # not guaranteed to work #clearpart --linux --drives=sda #part /boot --fstype ext3 --size=100 --ondisk=sda #part pv.6 --size=0 --grow --ondisk=sda #volgroup VolGroup00 --pesize=32768 pv.6 #logvol / --fstype ext3 --name=LogVol00 --vgname=VolGroup00 --size=1024 --grow #logvol swap --fstype swap --name=LogVol01 --vgname=VolGroup00 --size=1000 --grow --maxsize=1984 %packages @office @development-libs @editors @text-internet @gnome-desktop @dialup @core @base @games @emacs @base-x @graphics @printing @kde-desktop @sound-and-video @development-tools @graphical-internet kdepim emacs device-mapper-multipath xorg-x11-server-Xnest xorg-x11-server-Xvfb kdegraphics libsane-hpaio kdemultimedia imake -sysreport

2 1

centos support for Red Hat Enterprise MRG for RHEL-5
by Christopher Snow 27 Mar '10

27 Mar '10

I too would be interested in instructions for getting MRG working with centos. Many thanks in advance, Chris

1 0

squid init script
by Roman Garifullin 19 Mar '10

19 Mar '10

Hello all! I'm sorry if I wrote wrong place, but may be your will look at my patch to /etc/init.d/squid script in CentOS 5.4. The reason to rewrite it was the need of launching two process of the squid daemon with different config while original script was unable to do this easy. Now, one who need this, will change squid's config file and /etc/sysconfig/some_new_name_of_squid and just can make a hardlink in /etc/init.d. Very simple. Sory for my bad english

2 1

squid init script
by Roman Garifullin 18 Mar '10

18 Mar '10

I'm sorry, the correct file in attachment

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devel March 2010