[Pacemaker] Linux HA setup for CentOS 6.5

Digimer lists at alteeve.ca
Wed Oct 15 15:43:27 UTC 2014


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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>                      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
>
>
>
>                  --
>                  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>
>                  <mailto:Pacemaker at oss.__clusterlabs.org
>             <mailto:Pacemaker at oss.clusterlabs.org>>
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>             <http://oss.clusterlabs.org/__mailman/listinfo/pacemaker>
>
>             <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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>             http://oss.clusterlabs.org/__mailman/listinfo/pacemaker
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>
>             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
>
>
>
>         --
>         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
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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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