Clusters
From HCL
					
										
					
					Passwordless SSH
To set up passwordless SSH, there are three main things to do:
- generate a pair of public/private keys on your local computer
 - copy the public key from the source computer to the target computer's authorized_keys file
 - check the permissions.
 
You can repeat that transitively for "A->B->C". You can use the initial pair of keys everywhere.
See here for details: