[Pacemaker] CMAN nodes online

Gopalakrishnan N gopalakrishnan.an at gmail.com
Tue Sep 17 04:53:14 EDT 2013 

Even after giving FQDN in my /etc/hosts and /etc/sysconf/network also
updated in cluster.conf, propogated to other node as well, but still its
showing only one node. And muticast also enabled in my switch.




On Mon, Sep 16, 2013 at 11:52 PM, Gopalakrishnan N <
gopalakrishnan.an at gmail.com> wrote:

> My /etc/hosts is like this,
> cat /etc/hosts
> 127.0.0.1   localhost localhost.localdomain localhost4
> localhost4.localdomain4
> ::1         localhost localhost.localdomain localhost6
> localhost6.localdomain6
> 10.30.2.98  test01.iopextech.com test01
> 10.30.2.99  test02.iopextech.com test02
>
>
> and in my cluster.conf i have given the short name. So what you are saying
> better to use FQDN...!
>
> I will try to give FQDN in all my configuration files.
>
> And will try. Let's see.
>
> Thanks for your comments.
>
>
>
> On Mon, Sep 16, 2013 at 11:41 PM, Florian Crouzat <
> gentoo at floriancrouzat.net> wrote:
>
>> 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<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@**gmail.com<gopalakrishnan.an at gmail.com>
>>> >
>>>         <mailto:gopalakrishnan.an at __gm**ail.com <http://gmail.com>
>>>
>>>         <mailto:gopalakrishnan.an@**gmail.com<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@**gmail.com<gopalakrishnan.an at gmail.com>
>>> >
>>>         <mailto:gopalakrishnan.an at __gm**ail.com <http://gmail.com>
>>>
>>>         <mailto:gopalakrishnan.an@**gmail.com<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@**gmail.com<gopalakrishnan.an at gmail.com>
>>> >
>>>                  <mailto:gopalakrishnan.an at __gm**ail.com<http://gmail.com>
>>>
>>>         <mailto:gopalakrishnan.an@**gmail.com<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>
>>>
>>>         <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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>>> >
>>>
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>>> >
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>>>
>>>
>>>     --
>>>     Cheers,
>>>     Florian Crouzat
>>>
>>>     ______________________________**___________________
>>>     Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>     <mailto:Pacemaker at oss.**clusterlabs.org<Pacemaker at oss.clusterlabs.org>
>>> >
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>>>
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>>> >
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>>>     http://www.clusterlabs.org/__**doc/Cluster_from_Scratch.pdf<http://www.clusterlabs.org/__doc/Cluster_from_Scratch.pdf>
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>>> >
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>>>
>>>
>>>
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>>>
>>> Project Home: http://www.clusterlabs.org
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>>>
>>
>> --
>> Cheers,
>> Florian Crouzat
>>
>> ______________________________**_________________
>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>> 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
>>
>
>
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