enable-ssh-key-logon-disable-password-password-less-logon-centos/

cat ~/.ssh/id_rsa.pub | ssh root@destination_server_address "cat >> ~/.ssh/authorized_keys"

 

see also:

https://www.liberiangeek.net/2014/07/enable-ssh-key-logon-disable-password-password-less-logon-centos/