Pacemaker cluster fails to start with corosync.service error: "Corosync Cluster Engine exiting with status 8 at main.c"

Issue

• pcs cluster start command fails with the corosync.service error :

  # pcs cluster start
  Starting Cluster...
  Error: Unable to start corosync: Job for corosync.service failed because the control process exited with error code.
  See "systemctl status corosync.service" and "journalctl -xe" for details.
  

• corosync.service is failing to start with errors similar to below :

  systemd[1]: Starting Corosync Cluster Engine...
  corosync[254]:   [MAIN  ] Corosync Cluster Engine 3.1.7 starting up
  corosync[254]:   [MAIN  ] Corosync built-in features: dbus systemd xmlconf vqsim nozzle snmp pie relro bindnow
  corosync[254]:   [MAIN  ] failed to parse node address 'node1.example.com'
  corosync[254]:   [MAIN  ] Corosync Cluster Engine exiting with status 8 at main.c:1417.
  corosync.service: Main process exited, code=exited, status=8/n/a
  corosync.service: Failed with result 'exit-code'.
  systemd[1]: Failed to start Corosync Cluster Engine.
  

  systemd[1]: Starting Corosync Cluster Engine...
  corosync[123]:   [MAIN  ] Corosync Cluster Engine 3.1.8 starting up
  corosync[123]:   [MAIN  ] Corosync built-in features: dbus systemd xmlconf vqsim nozzle snmp pie relro bin>
  corosync[123]:   [MAIN  ] parse error in config: No valid name found for local host
  corosync[123]:   [MAIN  ] Corosync Cluster Engine exiting with status 8 at main.c:1445.
  

  systemd: Starting Corosync Cluster Engine...
  corosync[318393]: [MAIN  ] Corosync Cluster Engine ('2.4.5'): started and ready to provide service.
  corosync[318393]: [MAIN  ] Corosync built-in features: dbus systemd xmlconf qdevices qnetd snmp libcgroup pie relro bindnow
  corosync[318393]: [MAIN  ] parse error in config: No interfaces defined
  corosync[318393]: [MAIN  ] Corosync Cluster Engine exiting with status 8 at main.c:1415.
  corosync: Starting Corosync Cluster Engine (corosync): [FAILED]