@Yibing Liu
You can follow this:
While adding the new host to the existing cluster:
=> Edit the /etc/hosts file on existing Hosts in the cluster and update the ip address and FQDN of the
new host on all the nodes.
=> On new host follow the same step and update all the ip address and FQDN of all the host and as well as
for the new node. => you can save the setting and restart the ambari server and ambari agent.
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