Some quick notes on creating and using a key pair for SSH logon.
1. Generate key pair on the client.
ssh-keygen -t rsa -b 2048
2. Enter a passphrase when prompted. If you do not want a password so that you can use this key pair for automating logons just press Enter twice.
3. Copy the public key from the client to the server
scp ./ssh/id_rsa.pub username@server:.ssh/authorized_keys
The ssh-copy-id command, if it is available, can be used to copy the public key to the server as well.
4. Secure the .ssh folder on the server
chmod 700 ~/.ssh chmod 600 ~/.ssh/authorized_keys