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Make sure that the /etc/hosts file exists and contains the loopback address 127.0.0.1 with only the name localhost in both fully qualified and unqualified forms. For example:
127.0.0.1 localhost.localdomain localhost
Do not use the loopback address 127.0.0.1 or the name localhost in a node definition.
Do not assign the cluster node hostname to 127.0.0.1.