Why are nodes not seeing each other in a clustered environment?
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The two most common reasons for this is a misconfigured /etc/hosts file or a firewall is running.
Verify the /etc/hosts file
One common mistake is setting the nodes hostname to 127.0.0.1. For example, if there are two nodes, node1 and node2, the /etc/hosts file might look something like the following for the node1 system:
127.0.0.1 lo...Subscriber exclusive content
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