[Pacemaker] Linux HA setup for CentOS 6.5

Andrew Beekhof andrew at beekhof.net
Thu Oct 16 05:48:11 UTC 2014


On 16 Oct 2014, at 3:31 pm, Alex Samad - Yieldbroker <Alex.Samad at yieldbroker.com> wrote:

> I believe there was a change 6.4 -> 6.5 that moved from openais to cman…  I believe in rhel7 it is going back..

No, its going to native corosync (which is quite different to running against a custom plugin loaded into openais).

'cman' here is pretty much openais with a different config file and init script

>  
> I ran into this problem when I upgraded my centos 6.2 -> 6.5..
>  
> A
>  
> From: Sihan Goi [mailto:goister at gmail.com] 
> Sent: Thursday, 16 October 2014 3:15 PM
> To: The Pacemaker cluster resource manager
> Subject: Re: [Pacemaker] Linux HA setup for CentOS 6.5
>  
> After following the guide, I've successfully managed to get Apache server up and running in the cluster as an active/passive setup, but with some differences. My cluster stack is stated as being cman while the guide's is openais. Not sure if that's a problem. Also, some commands in the guide don't seem to work.
> 
> I'm moving on to DRBD installation now, but when I do a "yum install drbd-pacemaker drbd-udev", these packages are not available. After some googling, it seems that drbd83-utils/kmod-drbd83 or drbd84-utils/kmod-drbd84 is available via another repo. Does this work with the guide?
>  
> On Thu, Oct 16, 2014 at 9:35 AM, Sihan Goi <goister at gmail.com> wrote:
> Hi,
> 
> Thanks for the guide! I thought I had the same exact version...mine is also named "Pacemaker 1.1 Clusters from Scratch Creating Active/Passive and Active/Active Clusters on Fedora Edition 5", but my version of the document is meant for Fedora 17, and uses pcs and systemctl calls which don't exist on CentOS 6.5. I was trying to get it to work on CentOS 7 but realized support for DRBD on CentOS 7 is really lacking.
> 
> I'll refer to the version you posted from hereon.
>  
> On Wed, Oct 15, 2014 at 11:43 PM, Digimer <lists at alteeve.ca> wrote:
> Let pacemaker start cman/corosync on EL6.
> 
> This is the guide that covers it, written by Pacemaker's author:
> 
> http://clusterlabs.org/doc/en-US/Pacemaker/1.1-plugin/html-single/Clusters_from_Scratch/index.html
> 
> It notes that it's based on Fedora 13, but that maps to EL6 almost perfectly.
> 
> A very slightly altered approach is here, in my *very* unfinished tutorial:
> 
> https://alteeve.ca/w/Anvil!_Tutorial_3_on_EL6#Configuring_the_Anvil.21
> 
> The main difference is that Andrew's approach (see section 8.2.2) is to disable quorum via editing /etc/sysconfig/cman, where my approach handles it in the main /etc/cluster/cluster.conf (cman's main config file).
> 
> In any case, from then on, start pacemaker and let it handle everything else.
> 
> Cheers
> 
> digimer
> 
> On 15/10/14 04:27 AM, Sihan Goi wrote:
> Hi,
> 
> So I've decided to make things simpler and go with a wired network
> instead of wireless. I connected both boxes to a router, manually edited
> the ifcfg-eth0 files to set static IP addresses for both boxes (not
> before downloading and building a driver for the nic of 1 of the boxes),
> did a "chkconfig NetworkManager off", "service NetworkManager stop", and
> "service network restart".
> 
> I'm able to ping each other via IP address and hostname. I also already
> have corosync, pacemaker, crmsh and cman installed.
> 
> I then did the following as per the guide at
> http://geekpeek.net/linux-cluster-corosync-pacemaker
> 
> service corosync start - success.
> service pacemaker start - I get a "Starting cman...corosync cluster
> engine is already running [FAILED]"
> 
> What's up? :(
> 
> On Oct 15, 2014 12:23 PM, "Sihan Goi" <goister at gmail.com
> <mailto:goister at gmail.com>> wrote:
> 
>     No typo.
> 
>     [root at node02 network-scripts]# ls -lah
>     /etc/sysconfig/network-scripts/ifcfg-*
>     -rw-r--r--. 1 root root 254 Oct 10  2013
>     /etc/sysconfig/network-scripts/ifcfg-lo
> 
>     I installed CentOS 6.5 with the LiveDVD. I found it weird as well
>     that these files were missing.
> 
>     On Wed, Oct 15, 2014 at 11:54 AM, Digimer <lists at alteeve.ca
>     <mailto:lists at alteeve.ca>> wrote:
> 
>         Sure there isn't a typo there?
> 
>         an-c05n01:~# ls -lah /etc/sysconfig/network-__scripts/ifcfg-*
>         -rw-r--r--. 1 root root 225 Jan 16  2013
>         /etc/sysconfig/network-__scripts/ifcfg-bond0
>         -rw-r--r--. 1 root root 220 Jan 16  2013
>         /etc/sysconfig/network-__scripts/ifcfg-bond1
>         -rw-r--r--. 1 root root 198 Jan 16  2013
>         /etc/sysconfig/network-__scripts/ifcfg-bond2
>         -rw-r--r--. 1 root root 149 Jan 16  2013
>         /etc/sysconfig/network-__scripts/ifcfg-eth0
>         -rw-r--r--. 1 root root 144 Jan 16  2013
>         /etc/sysconfig/network-__scripts/ifcfg-eth1
>         -rw-r--r--. 1 root root 152 Mar 14  2013
>         /etc/sysconfig/network-__scripts/ifcfg-eth2
>         -rw-r--r--. 1 root root 149 Jan 16  2013
>         /etc/sysconfig/network-__scripts/ifcfg-eth3
>         -rw-r--r--. 1 root root 144 Jan 16  2013
>         /etc/sysconfig/network-__scripts/ifcfg-eth4
>         -rw-r--r--. 1 root root 152 Mar 14  2013
>         /etc/sysconfig/network-__scripts/ifcfg-eth5
>         -rw-r--r--. 1 root root 254 Jul 22 09:56
>         /etc/sysconfig/network-__scripts/ifcfg-lo
>         -rw-r--r--. 1 root root 213 Mar 13  2013
>         /etc/sysconfig/network-__scripts/ifcfg-vbr2
> 
>         I've never seen an EL6 install without the files there,
>         'network' or NetworkManager aside.
> 
>         digimer
> 
>         On 14/10/14 11:32 PM, Sihan Goi wrote:
> 
>             There aren't any config files in
>             /etc/sysconfig/network-__scripts. When I
>             was using CentOS 7, the config files were there
>             (ifcfg-something) but in
>             this CentOS 6.5 installation, they are missing.
> 
>             If is possible to not use cman, and just use corosync and
>             pacemaker? If
>             so, how?
> 
>             On Wed, Oct 15, 2014 at 11:22 AM, Digimer <lists at alteeve.ca
>             <mailto:lists at alteeve.ca>
>             <mailto:lists at alteeve.ca <mailto:lists at alteeve.ca>>> wrote:
> 
>                  You can manually configure the wireless LAN without
>             NetworkManager.
>                  If you take a look, there should be existing config
>             files in
>                  /etc/sysconfig/network-____scripts/ for the wireless
> 
>             connection. I've
>                  not done it myself since many Fedora's ago, but I
>             believe you can
>                  change NMCONTROLLER="no" and then start it up with
>                  /etc/sysconfig/network start. I could be a bit wrong,
>             but I am sure
>                  you can make wireless work without NM.
> 
>                  Question; Servers with WLAN? I assume these won't be
>             used for corosync?
> 
>                  digimer
> 
> 
>                  On 14/10/14 11:17 PM, Sihan Goi wrote:
> 
>                      Hi,
> 
>                      Is there a tutorial showing how to get a basic
>             Linux HA setup with
>                      replicated storage (via DRBD) working on CentOS
>             6.5? I want to have
>                      mySQL as the HA resource with the database
>             replicated across the
>                      nodes.
>                      I've scoured the web for one but it seems that I
>             get stuck in
>                      each one
>                      somewhere.
> 
>                      To elaborate, I have 2 CentOS 6.5 nodes configured
>             with distinct
>                      hostnames and static IPs. They are connected to a
>             wireless AP,
>                      and can
>                      ping each other.
> 
>                      I tried following this guide -
>             http://clusterlabs.org/____quickstart-redhat.html
>             <http://clusterlabs.org/__quickstart-redhat.html>
> 
>                      <http://clusterlabs.org/__quickstart-redhat.html
>             <http://clusterlabs.org/quickstart-redhat.html>>
>                      However, cman will not start when NetworkManager is
>             running, and my
>                      nodes cannot connect to the wireless AP without
>             NetworkManager
>                      running.
>                      Am I missing something or is that the stupidest
>             dependency ever?
>                      How is
>                      a cluster supposed to work when the nodes aren't
>             connected to
>                      one another?
> 
>                      I also tried following the "clusters from scratch"
>             guide but
>                      that seems
>                      to rely on systemctl calls which aren't available
>             on CentOS 6.5.
> 
>                      Any help?
> 
>                      --
>                      - Goi Sihan
>             goister at gmail.com <mailto:goister at gmail.com>
>             <mailto:goister at gmail.com <mailto:goister at gmail.com>>
>                      <mailto:goister at gmail.com
>             <mailto:goister at gmail.com> <mailto:goister at gmail.com
>             <mailto:goister at gmail.com>>>
> 
> 
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>             <http://www.clusterlabs.org/__doc/Cluster_from_Scratch.pdf>
> 
>             <http://www.clusterlabs.org/__doc/Cluster_from_Scratch.pdf
>             <http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf>>
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> 
> 
> 
>                  --
>                  Digimer
>                  Papers and Projects: https://alteeve.ca/w/
>                  What if the cure for cancer is trapped in the mind of a
>             person
>                  without access to education?
> 
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>             <mailto:Pacemaker at oss.clusterlabs.org>
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>             <mailto:Pacemaker at oss.clusterlabs.org>>
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> 
>             <http://oss.clusterlabs.org/__mailman/listinfo/pacemaker
>             <http://oss.clusterlabs.org/mailman/listinfo/pacemaker>>
> 
>                  Project Home: http://www.clusterlabs.org
>                  Getting started:
>             http://www.clusterlabs.org/____doc/Cluster_from_Scratch.pdf
>             <http://www.clusterlabs.org/__doc/Cluster_from_Scratch.pdf>
> 
> 
>             <http://www.clusterlabs.org/__doc/Cluster_from_Scratch.pdf
>             <http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf>>
>                  Bugs: http://bugs.clusterlabs.org
> 
> 
> 
> 
>             --
>             - Goi Sihan
>             goister at gmail.com <mailto:goister at gmail.com>
>             <mailto:goister at gmail.com <mailto:goister at gmail.com>>
> 
> 
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> 
>             Project Home: http://www.clusterlabs.org
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>             http://www.clusterlabs.org/__doc/Cluster_from_Scratch.pdf
>             <http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf>
>             Bugs: http://bugs.clusterlabs.org
> 
> 
> 
>         --
>         Digimer
>         Papers and Projects: https://alteeve.ca/w/
>         What if the cure for cancer is trapped in the mind of a person
>         without access to education?
> 
>         _________________________________________________
>         Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>         <mailto:Pacemaker at oss.clusterlabs.org>
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>         <http://oss.clusterlabs.org/mailman/listinfo/pacemaker>
> 
>         Project Home: http://www.clusterlabs.org
>         Getting started:
>         http://www.clusterlabs.org/__doc/Cluster_from_Scratch.pdf
>         <http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf>
>         Bugs: http://bugs.clusterlabs.org
> 
> 
> 
> 
>     --
>     - Goi Sihan
>     goister at gmail.com <mailto:goister at gmail.com>
> 
> 
> 
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> 
> 
> 
> -- 
> Digimer
> Papers and Projects: https://alteeve.ca/w/
> What if the cure for cancer is trapped in the mind of a person without access to education?
> 
> _______________________________________________
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> 
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> Bugs: http://bugs.clusterlabs.org
> 
> 
> 
> -- 
> - Goi Sihan
> goister at gmail.com
> 
> 
> 
> -- 
> - Goi Sihan
> goister at gmail.com
> _______________________________________________
> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
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> 
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