Now i can show how to configure SSH passwordless on Ubuntu Server. You can use SHH passwordless when you need to login without authentication. You need to config this on your host or laptop, not in VM or server side.
$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/ansible/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/ansible/.ssh/id_rsa.
Your public key has been saved in /home/ansible/.ssh/id_rsa.pub.
$ ssh-copy-id demo@172.16.238.20
$ ssh-copy-id demo@172.16.238.10
after that, now you can login to Ubuntu Server without any authentication
$ ssh demo@172.16.1.20
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