[Pacemaker] pacemaker with CMAN on RHEL 6.5

Digimer lists at alteeve.ca
Mon Jun 16 18:24:45 CEST 2014 

The subject says 6.5, so we need Thanachit to clarify.

If EL7, then no, there is no cman. You can use pcsd to form the cluster 
initially, but also, that version should not attempt to start cman at 
all, so I am still thinking it is RHEL/CentOS 6.

On 16/06/14 12:20 PM, emmanuel segura wrote:
>  From the previous output i seen this "Version: 1.1.10-5.el7-9abe687",
> so my question is "cman is used on redhat7?"
>
> 2014-06-16 18:10 GMT+02:00 Digimer <lists at alteeve.ca>:
>> You need to setup a skeleton cluster.conf file. You can use the 'ccs' tool,
>> here is an example (I use for my cluster, adjust the names to suit):
>>
>> ccs -f /etc/cluster/cluster.conf --createcluster an-anvil-04
>> ccs -f /etc/cluster/cluster.conf --setcman two_node="1" expected_votes="1"
>> ccs -f /etc/cluster/cluster.conf --addnode an-a04n01.alteeve.ca
>> ccs -f /etc/cluster/cluster.conf --addnode an-a04n02.alteeve.ca
>> ccs -f /etc/cluster/cluster.conf --addfencedev pcmk agent=fence_pcmk
>> ccs -f /etc/cluster/cluster.conf --addmethod pcmk-redirect
>> an-a04n01.alteeve.ca
>> ccs -f /etc/cluster/cluster.conf --addmethod pcmk-redirect
>> an-a04n02.alteeve.ca
>> ccs -f /etc/cluster/cluster.conf --addfenceinst pcmk an-a04n01.alteeve.ca
>> pcmk-redirect port=an-a04n01.alteeve.ca
>> ccs -f /etc/cluster/cluster.conf --addfenceinst pcmk an-a04n02.alteeve.ca
>> pcmk-redirect port=an-a04n02.alteeve.ca
>> ccs -f /etc/cluster/cluster.conf --setfencedaemon post_join_delay="30"
>>
>> hth
>>
>>
>> On 16/06/14 07:13 AM, Thanachit Wichianchai wrote:
>>>
>>> Hello Pacemaker guys,
>>>
>>> I am doing a proof of concept of active/passive HA cluster on RHEL 6.5
>>> Since the customer who I am working for will finally get support from
>>> Red Hat. Therefore, I am trying to comply with Red Hat Documentation.
>>> as stated in several places that on RHEL 6.5 - pacemaker is now
>>> supported with CMAN stack.
>>>
>>> I started configuring things by following steps describe in
>>>
>>> https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Configuring_the_Red_Hat_High_Availability_Add-On_with_Pacemaker/ap-configfile-HAAR.html
>>> document. This document provides configuration steps by using pcs
>>> command. no ccs or crmsh commands at all.
>>>
>>> After I have created cluster. I can start cluster services on node1  but
>>> cannot start it on node2 - there error is /etc/cluster/cluster.conf is
>>> not there on node2
>>>
>>>    pcs cluster start
>>> Starting Cluster...
>>> Starting cluster:
>>>      Checking if cluster has been disabled at boot...        [  OK  ]
>>>      Checking Network Manager...          [  OK  ]
>>>      Global setup...                    [  OK  ]
>>>      Loading kernel modules...            [  OK  ]
>>>      Mounting configfs...                  [  OK  ]
>>>      Starting cman... xmlconfig cannot find /etc/cluster/cluster.conf
>>>                                [FAILED]
>>> Stopping cluster:
>>>      Leaving fence domain...             [  OK  ]
>>>      Stopping gfs_controld...                  [  OK  ]
>>>      Stopping dlm_controld...                  [  OK  ]
>>>      Stopping fenced...                  [  OK  ]
>>>      Stopping cman...                  [  OK  ]
>>>      Unloading kernel modules...          [  OK  ]
>>>      Unmounting configfs...                [  OK  ]
>>>
>>> Error: unable to start cman
>>>
>>> pcs cluster status command output on node1 shows "cman" stack
>>>
>>>    pcs cluster status
>>> Cluster Status:
>>>    Last updated: Mon Jun 16 15:31:53 2014
>>>    Last change: Mon Jun 16 14:23:04 2014 via crmd on rhcs1.localdomain
>>>    Stack: cman
>>>    Current DC: rhcs1.localdomain - partition with quorum
>>>    Version: 1.1.10-14.el6-368c726
>>>    2 Nodes configured
>>>    0 Resources configured
>>>
>>> PCSD Status:
>>> Error: no nodes found in corosync.conf
>>>
>>>
>>> but from the aforementioned document from Red Hat. the stack is corosync.
>>>
>>> [root at z1 ~]#*|pcs cluster status|*
>>>
>>> Cluster Status:
>>>    Last updated: Thu Jul 25 13:01:26 2013
>>>    Last change: Thu Jul 25 13:04:45 2013 via crmd onz2.example.com
>>> <http://z2.example.com>
>>>    Stack: corosync
>>>    Current DC:z2.example.com  <http://z2.example.com>  (2) - partition with
>>> quorum
>>>
>>>    Version: 1.1.10-5.el7-9abe687
>>>    2 Nodes configured
>>>    0 Resources configured
>>>
>>>
>>> from the 2 incidents above, I am not sure whether I am on the right path.
>>>
>>> My PoC objectives are to
>>>
>>>
>>> 1. configure Active/Passive HA cluster on RHEL 6.5
>>>
>>> 2. Get Full Support from Red Hat on both OS and High Availability Add-on
>>>
>>>
>>> 3. choose HA Cluster software and stacks which has a future. I expect to
>>> have more than 5 years support from Red Hat and Community.
>>>
>>>
>>> I found this quick start guide for redhat on cluster
>>> labshttp://clusterlabs.org/quickstart-redhat.html
>>>
>>>
>>>
>>> I am not sure whether I should use ccs command to create cluster first and
>>> use pcs to manage resource.
>>>
>>> on more question, I see corosync will be supported in RHEL7. Can I use
>>> only corosync with pacemaker in RHEL 6.5? Will I get support from Red Hat ?
>>>
>>>
>>> Could you guys please help advise?  Thanks a lot.
>>>
>>>
>>>
>>> --
>>>
>>> Thanachit Wichianchai / IT Specialist - RHCSA, RHCE
>>> +66 87 696 5522/ thanachit [at] acm.org
>>> <mailto:thanachit%20[at]%20acm.org>
>>>
>>> http://hi.im/thanachit
>>>
>>> Google Plus <https://plus.google.com/u/0/102459307371925233265/posts>
>>> Linkedin <http://th.linkedin.com/in/thanachit>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>
>>> Project Home: http://www.clusterlabs.org
>>> Getting started: 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
>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>
>> Project Home: http://www.clusterlabs.org
>> Getting started: 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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