[Pacemaker] Linux HA setup for CentOS 6.5
Digimer
lists at alteeve.ca
Wed Oct 15 11:43:27 EDT 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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> <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?
>
> ___________________________________________________
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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
> 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?
>
> _________________________________________________
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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>
> Bugs: http://bugs.clusterlabs.org
>
>
>
>
> --
> - Goi Sihan
> goister at gmail.com <mailto:goister at gmail.com>
>
>
>
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>
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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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