On the machine that you want to use to ssh to the other OS X machine do this:
– Create id_rsa key.
when prompted use the suggested filename, and (I strongly recommend to select a passphrase)
– Copy public key from ~/.ssh/id_rsa.pub to your server location (in the example below 10.20.30.40)
ssh-copy-id -i ~/.ssh/id_rsa.pub firstname.lastname@example.org
– If you didn’t specify a passphrase, at this point you will be able to ssh to your server.
If you add a passphrase
You will need one more extra step to store the passphrase in the keychain so you won’t be asked to type it over and over again.
– Create a file in ~/.ssh/config
– Add these contents
Host * AddKeysToAgent yes UseKeychain yes
Now once you enter the passphrase, OS X wont ask you again.