Step One—Create the RSA Key Pair
The first step is to create the key pair on the client machine (there is a good chance that this will just be your computer):
ssh-keygen -t rsa
Step Two—Copy the Public Key
Once the key pair is generated, it's time to place the public key on the virtual server that we want to use.
You can copy the public key into the new machine's authorized_keys file with the ssh-copy-id command. Make sure to replace the example username and IP address below.
Alternatively, you can paste in the keys using SSH:
cat ~/.ssh/id_rsa.pub | ssh firstname.lastname@example.org "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys"
No matter which command you chose, you should see something like: