RHEL Cluster won't start after specifying the multicast address

Solution Verified - Updated

Environment

  • Red Hat Enterprise Linux 6
  • High Availability

Issue

After specifying the multicast address for my RHEL cluster, cman fails to start with the following error:

corosync [MAIN  ] parse error in config: No multicast address specified

Resolution

Specify a multicast address that falls in the supported range of 224.0.0.0 to 239.255.255.255.

Root Cause

  • If the specified multicast address falls outside the supported range of addresses for the cluster, cman will be unable to recognize it as a viable option, and assume that no address has been specified
  • For more information about assigning a specific multicast address, please see the following article:
    Can multicast address be changed in Red Hat Cluster Suite?

Diagnostic Steps

  • Determine if the specified multicast address falls inside this range: 224.0.0.0 to 239.255.255.255.
  • Look for the following error when attempting to start cman:
corosync [MAIN  ] parse error in config: No multicast address specified
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