SSH pair key with RSA.

1. From local machine, create the private and public keys

#ssh-keygen -t rsa

*Any prompt just passed as default.

2. Copy the public key to the remote machine (need to enter the password for the first time)

#cat ~/.ssh/id_rsa.pub | ssh user@server "cat - >> ~/.ssh/authorized_keys"

That's all

Troubleshooting
If you get a connection refused message
You probably have a server problem, check sshd is running "netstat -nlp" and there is no firewall rule in place blocking port 22 "iptables -nL".

You still get prompted for a password
Try to ssh to the server with verbose output:

#ssh -vv user@server

If you get a line like this, not containing "publickey":
debug1: Authentications that can continue: password,keyboard-interactive
Then check sshd_config on the server and remove the line "PubkeyAuthentication no" if it exists then restart sshd.

If you don't get a line like:
debug1: try pubkey: /home/rossy/.ssh/id_dsa
Then check "ssh_config" on the client and if it exists, remove "PubkeyAuthentication no" if it exists.
If you still don't see that line then make sure that "~/.ssh/id_dsa" exists on the client.

If you get a line like:
debug2: we sent a publickey packet, wait for reply
Check that "~/.ssh/authorized_keys" exists on the server and contains a line the same as "~/.ssh/id_dsa.pub" on the client.