Passwordless SSH log in for MAC OS X

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)

ssh-keygen

– 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 username@10.20.30.40

– 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.

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