Verify settings for the network

Before you add a compute node, please verify network connect between the management node and compute node works.

a). Verify ping connect between the two nodes.

On the management node:

ping <the compute node IP>

On the compute node:

ping <the management IP>

If the ping connect does not work. Please solve this network issue first.

b). Verify the DNS performance.
On the management node, get the hostname which is resolved by DNS.

nslookup <the compute node IP>

If you has no the nslookup command, please install it by:

yum install -y bind-utils

For example, the nslookup command will type like:

12.34.56.78.in-addr.arpa	name = cic1000.ibm.com

cic1000.ibm.com is the hostname of compute node, which is resolved by DNS. Then on your management node, try to ping the hostname. If the management node fails do that and throw the error like:

ping: cic1000.ibm.com: Name or service not known

It dedicates that the DNS setting on the management node does not work. Please solve this DNS issue first.
Similarly, execute the nslookup command on your compute node to get the hostname of the management node. And verify the DNS of the compute node.