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CentOS High Availability by Mitja Resman

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Installing and configuring Corosync

Now let's get down to business. You must configure the firewalld daemon on your cluster nodes to allow cluster communication traffic among the cluster nodes. Add a firewall rule to allow UDP traffic on 5404 and 5405, and reload the firewalld daemon. In the following screenshot, you can see the commands used for firewalld daemon reconfiguration to allow Corosync traffic:

Installing and configuring Corosync

Note

The default Corosync cluster communication ports are 5404 and 5405, on which the UDP protocol is used. The ports are configured in the /etc/corosync/corosync.conf configuration file. If you want to change the default Corosync communication ports, ...

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