SSH passwordless login under LINUX Cluster

How can enable SSH passwordless login for my n nodes in Linux Cluster? Yes.
Put virtual host and/or IP in source server!
for example. Oracle account in server A need to access target server B1, B2 in cluster. And B1 has virtual_hostname1, virtual_IP1, B2 has virtual_hostname2, virtual_IP2.
We need to edit oracle $HOME/.ssh/known_hosts, make it like this:
B1, virtual_Hostname1, virtual_IP1, virtual_hostname2, virtual_IP2 ssh-rsa **keys**value**==

About Pang

Oracle DBA working in database, fusion middleware and identity management and cloud.
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