Discuss December 2012

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146 participants
124 discussions

Long time away for Centos installs, need some info
by Robert Moskowitz 04 Dec '12

04 Dec '12

I have not touched my Centos systems for over a year; it is time to get current to do some new, interesting things. So of course, 6.3, but which install? I run a local repo that I rsync from a mirror near me. So I believe I can use the Netinstall iso, but which one? How do I determine if I have a i386 or x86_64 processor? If x86_64 how do I determine if I use EFI or not?

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iptables 1.4 and kernel 2.6 CONFIG_IP_NF_MATCH_STATE
by Miguel González Castaños 04 Dec '12

04 Dec '12

Hi, I have a VPS running Centos 6.2 and trying to run this iptables rule: [root@myserver ~]# iptables -A INPUT -i venet0 -m state --state ESTABLISHED -j ACCEPT iptables: No chain/target/match by that name. Narrowing down the issue it seems there is no IP_CONNTRACK support but now it's called NF_CONNTRACK. However following this link: http://www.spinics.net/lists/netfilter/msg33535.html I have found that I don't have CONFIG_IP_NF_MATCH_STATE support. Unfortunately this virtuozzo VPS is not using modules: [root@vrtl13369 ~]# lsmod Module Size Used by How can I enable that CONFIG_IP_NF_MATCH_STATE support in my kernel? I prefer to stick to the kernels provided by the repos and not recompile my own kernel. Regards, Miguel

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iSCSI Question
by Steven Crothers 04 Dec '12

04 Dec '12

Hey everyone, Is anybody aware of a /true/ active/active multi-head and multi-target clustered iSCSI daemon? IE: Server 1: Hostname: host1.test.com IP Address: 10.0.0.1 Server 2: Hostname: host2.test.com IP Address: 10.0.0.2 Then they would utilize a CLVM disk between them, let's call that VG "disk" and then directly map each LUN (1,2,3,4,etc) to LV's named 1,2,3,4,... and so on. That would essentially make both host1 and host2 identical iSCSI targets. So I could hook up 30 servers to each LUN on each host1 and host2 (assuming those block devices had a cluster aware filesystem on them). However, what I wan't to accomplish is true active/active MPIO utilizing the dm driver to combine LUN 1 from both host1 and host2 as a single /dev/dm-0 device in active/active mode. This would allow me to multipath across multiple fabrics, develop true high availability and increase my throughput significantly. Any idea of an iscsi tgtd that supports this? As far as I can tell, none do (that I can find). I know some proprietary vendors have this type of functionality, which may or may not be using iSCSI code (but that's a whole set of arguments for later..). Ultimately, my goal is this. I want to take my existing Ceph cluster, expose a handful of RBDs from it to two iSCSI heads running C6 or RHEL6 or what have you, so I can use my inexpensive storage built on Linux -- for my Windows 2008 machines. Thoughts? Steven Crothers steven.crothers(a)gmail.com

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How to configure sendmail
by Todd Cary 04 Dec '12

04 Dec '12

In reading my Linux Admin books and looking at the help files I am confused about what entries to enter into sendmail.mc. To date I have not had to configure sendmail since I use a class in PHP that is straight, however I am learning how to use Concrete5 for my local Rotary club and it apparently needs sendmail. My smtp provider is smtp.sonic.net and it requires user name and password. Is there a simple example that could guide me on setting the parameters in sendmail.mc? I believe doing the "make" after is straight forward. Todd -- Ariste Software Bend, OR 97702 http://www.aristesoftware.com

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Extending schema on Centos DS
by Chris Taylor 04 Dec '12

04 Dec '12

I am running CentOS DS server (version 8.1.0) in a mixed master setup. I am looking for the best way to extend the schema without breaking replication? I was successfully able to extend the schema on my two servers manually but replication broke after a restart of dirsrv. [03/Dec/2012:11:04:17 -0400] NSMMReplicationPlugin - agmt="cn=web-ldap02" (web-ldap02:389): Unable to acquire replica: there is no replicated area "dc=eastlink,dc=ca" on the consumer server. Replication is aborting. [03/Dec/2012:11:04:17 -0400] NSMMReplicationPlugin - agmt="cn=web-ldap02" (web-ldap02:389): Incremental update failed and requires administrator action [03/Dec/2012:11:04:17 -0400] NSMMReplicationPlugin - agmt="cn=web-ldap02-NetscapeRoot" (web-ldap02:389): Unable to acquire replica: there is no replicated area "o=netscaperoot" on the consumer server. Replication is aborting. What is the correct way to extend the schema on a MMR setup, I haven't been able to find much on the subject? Thanks, Chris

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XFCE4 group missing on Centos 5.x?
by Keith Roberts 04 Dec '12

04 Dec '12

I had XFCE group installed and working on C5.8 32 bit. I have done a fresh installation using the C 5.5 DVD. I cannot seem to find the XFCE group now. Has this been removed from Centos 5.x ? TIA Keith ----------------------------------------------------------- Websites: http://www.karsites.net http://www.php-debuggers.net http://www.raised-from-the-dead.org.uk All email addresses are challenge-response protected with TMDA [http://tmda.net] -----------------------------------------------------------

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matplotlib pygtk version problem
by tacolijst list 03 Dec '12

03 Dec '12

Hello, Anybody a solution for the following problem: the matplotlib library for Python in Centos 6.3 crashes my application because of a deprecated PyGtk2 version. Can be easily reproduced: installation of python 2.6.6 with matplotlib Type in the python shell: from pylab import plot plot([0,1],[0,1]) Error: /usr/lib64/python2.6/site-packages/matplotlib/backends/backend_gtk.py:621: DeprecationWarning: Use the new widget gtk.Tooltip self.tooltips = gtk.Tooltips() self.tooltips = gtk.Tooltips() Fatal Python error: GC object already tracked Aborted (core dumped) Looks like it has to do with the ridiculous old PyGtk version 2.16 which should be >2.2 for matplotlib any solutions? Taco Walstra University of Amsterdam

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CentOS 6.3 - KDE login screen configuration problems
by John Horne 03 Dec '12

03 Dec '12

Hello, We generally use CentOS for some servers, and so do not use a GUI interface. However, I have recently installed CentOS 6.3 onto a PC with KDE. I am familiar with KDE as I use it with Fedora for my work PC. The problem is that we would like to configure the login screen, so that it does not show the user list, that it does not allow the shutdown or reboot commands (from the login screen), and if possible to remove the 30 second confirmation timer that occurs when logout (via 'leave') is selected. I have gone into the 'System settings->Advanced->Login screen', and disabled both local and remote shutdowns and reboots. I have also disabled the showing of the user list, and disabled logout confirmations. However, none of this has had any effect. The login screen remains the same - showing the userlist and shutdown/reboot commands, and logging out still shows the 30 second confirmation timer. I have compared the /etc/kde/kdm/kdmrc file from the CentOS PC to my Fedora PC and they are similar. (I make the same changes to my work PC, and these take effect.) Anyone any ideas about this? Thanks, John. -- John Horne Tel: +44 (0)1752 587287 Plymouth University, UK Fax: +44 (0)1752 587001

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Re: [CentOS] CentOS 6.3 - KDE login screen configuration problems
by Scot P. Floess 02 Dec '12

02 Dec '12

Just create the file /etc/sysconfig/desktop and put in it: DESKTOP=KDM I believe it's DESKTOP - you can dbl check /etc/X11/prefdm Sent from my phoneMike Watson <mikew(a)crucis.net> wrote:The last reply to this subject said to modify /etc/sysconfig/desktop to change GDM to KDM. This would then enable the KDE login screen instead of the default Gnome. However, when I checked my CentOS 6.3 system, there was no such file, no /etc/sysconfig/desktop. I've not been able to find any method to enable KDE login in 6.3. The method mentioned in the earlier reply was for CentOS 5, not 6. Any further suggestions? mw -- -- "Lose not thy airspeed, lest the ground rises up and smites thee." -- William Kershner http://crucis-court.com http://www.crucis.net/1632search _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

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Re: [CentOS] CentOS 6.3 - KDE login screen configuration problems
by Mike Watson 02 Dec '12

02 Dec '12

The last reply to this subject said to modify /etc/sysconfig/desktop to change GDM to KDM. This would then enable the KDE login screen instead of the default Gnome. However, when I checked my CentOS 6.3 system, there was no such file, no /etc/sysconfig/desktop. I've not been able to find any method to enable KDE login in 6.3. The method mentioned in the earlier reply was for CentOS 5, not 6. Any further suggestions? mw -- -- "Lose not thy airspeed, lest the ground rises up and smites thee." -- William Kershner http://crucis-court.com http://www.crucis.net/1632search

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Discuss December 2012