How to Sync Cluster Configuration and Verify Failover Setup in Nodes – Part 4

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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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55 Responses

  1. Karuppasamy K says:

    I have run the command:

    # ccs -h --addresource fs name=my_fs device=/dev/mapper/vg_clusterserver-lv_home mountpoint=/home fstype=ext4

    Validation Failure, unable to modify configuration file (use -i to ignore this error).

    Please give the solution?

    • Thilina Uvindasiri says:


      Note, in the case this can be due to lack of permission to the config file. Please check the permissions.

  2. Anish says:

    Request to post something on Pacemaker cluster also this was very nice :)

  3. Liam Blom says:

    What happens when the Cluster Server dies? Isn’t that like a single point of failure?

  4. Nishith Niranjan Vyas says:


    I’ve completed all 3 parts successfully on CentOS 6.3 32 bit OS, but can’t justify 4th Part. I am configuring apache in failover mode. Below is the error I am having since more than 2 hours.

    # ccs -h --addservice webservice1 domain=linuxboxfod recovery=relocate autostart=1

    Validation Failure, unable to modify configuration file (use -i to ignore this error).

  5. Rajnish Rana says:

    Hi Thilina,
    can you share your /etc/hosts file of your management node?

    When i run the command clustat it shows only one node active.
    My /etc/hosts is:
    [[email protected] cluster]# cat /etc/hosts localhost localhost.localdomain localhost4 localhost4.localdomain4
    ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

    If i dont add as alias for 144 & 145 then cman service doesnt start.

    145 is my master node. Can you help me in this?

  6. DGi says:

    Very interesting series indeed, However there is a single point of failure: the cluster server.

    How do you suggest to come over?

  7. sandesh hegde says:

    During the add resource command I’m getting error like Validate failed. But I checked each and every syntax all are fine. Please give me a suggestion how to resolve the error used (ccs -h –addresource fs name=my_fs device=/dev/sdb1 mountpoint=/cluster fstype=ext4)

  8. Raman says:


    First of all, great article.

    I am having trouble in one step .. as soon as run “ccs -h –sync –activate”, I get the error “Cluster.conf file specified is not a valid cluster.conf file (use -i to ignore this error)”.

    Any suggestion?

    • Raman says:

      I tried everything again but this time all the things worked fine except for “clustat” command .. I got “Could not connect to CMAN: No such file or directory” .. Do I need to start cman on my cluster server ?

      • CMAN should be online as a mandatory fact.

        • Rakesh Negi says:

          Getting this error while starting cman at master:

          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 ]

          Here is the sample Cluster.conf

          Topology is Node 1
          Master Server running luci onmaster server and cman is running fine on node 1 and 2

  9. ranjan says:

    how to take at luci interface please update sir

  10. ramesh says:

    Thanks a lot to shared your knowledge to us . I have learnt a real experience about cluster implementation, configuration setup.

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