How to change Multicast Addresses in Red Hat High Availability Cluster on RHEL 6?

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux(RHEL) 6 with High Availability Add-On

Issue

  • Need to know the steps to configure the new multicast IP 239.192.200.200, right now we have 239.192.200.100.
  • How to change the multicast address in Red Hat Cluster from command line?
  • How to add multicast address in Red Hat Cluster?

Resolution

The multicast address can be specified and changed manually in the cluster configuration file using following command:

# ccs -h host --setmulticast <multicastaddress>

Change the <multicastaddress> with one which you would like to assign.

  • Example:
# ccs -h host --setmulticast 239.192.200.200

This will overwrite the old value and set it to new address which specified on command line(239.192.200.200).

After running this command, propagate the changes to other cluster nodes.

If you specify or modify a multicast address, you must restart the cluster for this to take effect. For information on starting and stopping a cluster with the ccs command, refer to Section Starting and Stopping a Cluster or all cluster services can be stopped and start in sequence. Refer Starting and Stopping the Cluster Software for more details on this topic.

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