Fencing and Adding a Failover to Clustering – Part 3

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Thilina Uvindasiri

I'm a BSc Special (Hons) graduate in Information Technology and works as an Engineer-Systems. Love to work, explore and research Linux and play rugby as a hobby.

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37 Responses

  1. Abhi says:

    This is the first time i am using Linux cluster so i need your help.

    I had setup vcs and sun cluster before, i have a doubt here how to setup up a quorum disk in centos 7. I have a requirement to setup in prod box which is in physical server it will be a 2 node cluster and few shared lun for the data.

    I am stuck in the quorum. I cannot see no one mentioning shared disk for quorum ( 500MB normally which we give ) to setup. Hope you understand my requirement and my understanding.

  2. christian wolff says:

    Is the part 4 already available sir?

  3. NIKE LEUNG says:

    Do you have the part 4 yet?

  4. Rakesh Negi says:

    Hi Thilina,

    Do you have notes for fencing on Centos 7 for 2 Nodes Cluster

  5. Rakesh Negi says:

    Hi ,
    CMAN service started fine in Node1 and Node2 but while starting cman at Master server it is getting fail.
    saying Node name cannot found.But the tags for both nodes are present .
    Has anyone came across such error.

    • Rakesh,
      can you post the error? Did you check that CMS can resolve the node IPs?

      • Rakesh Negi says:

        Hi Thilina,

        Below is the error:

        [[email protected] cluster]# service cman start
        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… Cannot find node name in cluster.conf
        Unable to get the configuration
        Cannot find node name in cluster.conf
        cman_tool: corosync daemon didn’t start Check cluster logs for details
        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 ]

        Server details: master.uic.com – Management node node1.uic.com node2.uic.com

        /etc/hosts ( localhost localhost.localdomain localhost4 localhost4.localdomain4
        ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 node1.uic.com node1.uic.com node2.uic.com node2.uic.com master.uic.com master.uic.com

        cluster.conf (

        All the nodes (management node i.e. master.uic.com, node1, node2 can ping each other.

        Please help.

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