What are the supported "transport" types for corosync on RHEL 8 or later?

Solution Verified - Updated

Environment

  • Red Hat Enterprise Linux Server 8, 9, 10 (with the High Availability Add On)

Issue

What are the supported transport types for corosync on RHEL 8 or later?

Resolution

The only supported transport for corosync on RHEL 8 or later is knet. For more information then see: Support Policies for RHEL High Availability clusters - Transport Protocols.

A properly configured cluster for RHEL 8 or later should be using knet for the transport type for corosync. For example:

# grep transport /etc/corosync/corosync.conf
    transport: knet
# corosync-cmapctl | grep "totem.transport "
totem.transport (str) = knet

If a RHEL 8 or later pacemaker cluster is not using knet for the transport type for corosync then it should be modified to use knet.

  • Edit the file /etc/corosync/corosync.conf and change the transport on one node: transport: knet

  • Sync the changes to all cluster nodes.

       # pcs cluster sync

• Stop the cluster on all cluster nodes.

    # pcs cluster stop --all

  • Start the cluster on all cluster nodes.

      # pcs cluster start --all

Diagnostic Steps

In this example below the RHEL 8 cluster is using an unsupported transport type for corosync. The only supported transport type for corosync on RHEL 8 or later is knet. If it returns anything other than knet on RHEL 8 or later then the cluster is using an unsupported value for the transport type for corosync.

  • Check the configured type of transport in corosync configuration file.

       $ grep -h transport /etc/corosync/corosync.conf
             transport: udpu

  • Check the configured type of transport in corosyncat runtime

       $  corosync-cmapctl | grep "totem.transport "
   totem.transport (str) = udpu
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