[Pacemaker] CMAN nodes online
Florian Crouzat
gentoo at floriancrouzat.net
Mon Sep 16 15:41:28 UTC 2013
Le 16/09/2013 17:30, Gopalakrishnan N a écrit :
> Hey Guys,
>
> The OS am running is CentOS 6.4 (64bit) and I have disabled IPtables and
> SeLinux.
>
> My goal is to make Apache Tomcat as HA. As a first step thought of
> testing with Apache.
>
> My network setup is like this,
> Node1 is connected to switch
> Note2 is connected to switch.
>
> My cluster.conf file is as follows,
> [root at test01 ~]# cat /etc/cluster/cluster.conf
> <?xml version="1.0"?>
> <cluster config_version="1" name="mycluster1">
> <logging debug="off"/>
> <clusternodes>
> <clusternode name="test01" nodeid="1">
> <fence>
> <method name="pcmk-redirect">
> <device name="pcmk" port="test01"/>
> </method>
> </fence>
> </clusternode>
> <clusternode name="test02" nodeid="2">
> <fence>
> <method name="pcmk-redirect">
> <device name="pcmk" port="test02"/>
> </method>
> </fence>
> </clusternode>
> </clusternodes>
> <fencedevices>
> <fencedevice name="pcmk" agent="fence_pcmk"/>
> </fencedevices>
> </cluster>
>
>
> And @some point of time am able to see both nodes are registered,
> [root at test01 ~]# cman_tool nodes
> Node Sts Inc Joined Name
> 1 M 104 2013-09-17 02:01:11 test01
> 2 M 108 2013-09-17 02:15:07 test02
>
> And @sometimes with crm_mon -1, I get the following
>
> [root at test01 ~]# crm_mon -1
> Last updated: Tue Sep 17 02:47:27 2013
> Last change: Tue Sep 17 00:42:43 2013 via crmd on test01
> Stack: cman
> Current DC: NONE
> 4 Nodes configured, 2 expected votes
> 0 Resources configured.
>
>
> Node test01: UNCLEAN (offline)
> Node test01.iopextech.com <http://test01.iopextech.com>: UNCLEAN (offline)
> Node test02: UNCLEAN (offline)
> Node test02.iopextech.com <http://test02.iopextech.com>: UNCLEAN (offline)
>
> Thanks.
>
Ok, if you are still unhappy with CMAN check your switch for multicast.
From there, I assume you are happy with cman otherwise there are no
reasons to start pacemaker, but you did, so you get my point ;)
This kind of errors often indicates that your /etc/hosts or DNS is wrong
and pacemaker has a hard time to map hostnames and IPs, etc (not sure
about the internals there...)
Get rid of the invalid nodes by editing the configuration; stop
pacemaker; fix your resolutions and retry.
In the entire process, I usually use FQDN in my cluster.conf file, and I
add them and the corresponding ring IP in my /etc/hosts file on all
nodes. I also use the same FQDN in my pacemaker configuration.
Cheers
>
>
>
> On Mon, Sep 16, 2013 at 8:40 PM, Florian Crouzat
> <gentoo at floriancrouzat.net <mailto:gentoo at floriancrouzat.net>> wrote:
>
> Le 16/09/2013 14:18, Gopalakrishnan N a écrit :
>
> Do I need to have a cross over cable between each node? Is it
> mandatory?
>
>
> Nop it doesn't.
> In your case, I'd check the network architecture and/or firewalling
> regarding multicast. You probably either have wrong iptables and/or
> a switch dropping your multicast corosync ring(s).
>
> Also, please, as Andreas said: try to communicate with us in a more
> efficient way: more context, more informations and more output
> (pasted somewhere).
>
> We are happy to help people, but we don't have to waste our time
> trying to understand what these exact people doesn't tell us because
> they are lazy.
>
> ps: also use 'corosync-objctl' ; it's a good command to debug rings
> and configurations.
>
> Cheers,
> Florian.
>
>
>
> On Mon, Sep 16, 2013 at 8:01 PM, Gopalakrishnan N
> <gopalakrishnan.an at gmail.com
> <mailto:gopalakrishnan.an at gmail.com>
> <mailto:gopalakrishnan.an at __gmail.com
> <mailto:gopalakrishnan.an at gmail.com>>> wrote:
>
> Again the when i restarted the pacemaker and cman not the
> nodes are
> not in online, back to square 1.
>
> node1 shows only node1 online, and node2 says node2 online.
> I don't
> know what's happening in the background...
>
> Any advice would be appreciated..
>
> Thanks.
>
>
> On Mon, Sep 16, 2013 at 6:47 PM, Gopalakrishnan N
> <gopalakrishnan.an at gmail.com
> <mailto:gopalakrishnan.an at gmail.com>
> <mailto:gopalakrishnan.an at __gmail.com
> <mailto:gopalakrishnan.an at gmail.com>>>
>
> wrote:
>
> Hi guys,
>
> I got it, basically it tool some time to propogate and
> now two
> nodes are showing online...
>
> Thanks.
>
>
> On Mon, Sep 16, 2013 at 6:39 PM, Gopalakrishnan N
> <gopalakrishnan.an at gmail.com
> <mailto:gopalakrishnan.an at gmail.com>
> <mailto:gopalakrishnan.an at __gmail.com
> <mailto:gopalakrishnan.an at gmail.com>>> wrote:
>
> I have configured CMAN as per the link
> http://clusterlabs.org/doc/en-__US/Pacemaker/1.1-plugin/html-__single/Clusters_from_Scratch/__index.html#_configuring_cman
> <http://clusterlabs.org/doc/en-US/Pacemaker/1.1-plugin/html-single/Clusters_from_Scratch/index.html#_configuring_cman>
> but
> when I type cman_tools nodes only one node is
> online even
> thought the cluster.conf is propogated in other
> node as well.
>
> what could be the reason, in node1, cman_tool nodes
> shows
> only node1 online, in node2 it shows only node2 is
> online.
> How to make two nodes as online, even thought CMAN
> service
> is running in both nodes.
>
> Thanks in advance.
>
> Regards,
> Gopal
>
>
>
>
>
>
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>
>
>
> --
> Cheers,
> Florian Crouzat
>
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> <http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf>
> Bugs: http://bugs.clusterlabs.org
>
>
>
>
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--
Cheers,
Florian Crouzat
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