[Pacemaker] pacemaker with CMAN on RHEL 6.5

Thanachit Wichianchai thanachit.w at googlemail.com
Mon Jun 16 17:58:42 UTC 2014


Hi, It is EL 6.5. For Version: 1.1.10-5.el7-9abe687 it is the output posted in redhat document. --
>>>> 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

Thank you very much.

Thanachit


Sent from my iPad

> On 16 มิ.ย. 2557, at 23:24, Digimer <lists at alteeve.ca> wrote:
> 
> 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>
>>>> 
>>>> 
>>>> 
>>>> 
>>>> _______________________________________________
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>>>> 
>>>> 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?
> 
> _______________________________________________
> 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




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