This assumes a couple of things.
- You want more keys in the future.
- You are on linux.
Step 1: Generate the key.
ssh-keygen -f ~/.ssh/<Name of key, can be anything> -N ''
Step 2: Add following to ~/.ssh/config
Host <IP Address>
User <User>
IdentityFile ~/.ssh/<Name of key>
IdentityFile ~/.ssh/<Name of key>
Step 3: Add key to server
ssh-copy-id -i ~/.ssh/<Name of key>.pub user@ipaddress
Step 4: Be happy.