assume server=220.127.116.11, remotesvr=18.104.22.168
On remotesvr, run `ssh-keygen` and follow the prompts to create an rsa-id. When asked for a passphrase, just press enter as you don't want a passphrase. You should end up with 2 files. One will be "something.pub" and the other maybe id-rsa or whatever you told it to call it. The .pub file will be 1 long line (might break across rows) and is the public key.
Still on remotesvr, (and ssh-keygen may have done this for you, i can't remember),
`chmod 700 ~/.ssh`
copy the .pub file above, and rename it to "~/.ssh/authorized_keys2".
`chmod 600 ~/.ssh/authorized_keys2`.
Copy the rsa-id file to server and call whatever you like. You should keep this file secure.
On server, ssh into remotesvr using the command: `ssh -i rsa-id usera@remotesvr` - the first time you will have to confirm the remote ID. This is a one time thing.