@Elitsa Milanova The SSH Key you have provided, Ambari uses it for bootstrapping new node ( installing ambari agent etc. ), If you have already added nodes and installed components on them then there should be no issues, if you want to add new node and before adding new nodes your private key got changed, there should not be an issue because at the time of adding new node, Ambari should ask you for the private key again. See below screenshot Note - Passwordless SSH required between Ambari server and Ambari agent nodes only at the time of bootstrapping, once ambari-agent is up and running then communication between master and slave components happens over RPC, they don't need SSH for communication(Except for SSHFencing between two NNs if HA is configured)
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