Allow ssh login between machines without passwd, each client will create a private key and public key and send public key to target manchine, then it will access without password.

1. vim /etc/ssh/sshd_config

Change the setting PrintLastLog to "no"

Change the setting PermitRootLogin to "yes"

2. vim /etc/motd

Change the content to what you want.

3. service sshd restart or  /etc/init.d/ssh restart