SSH key: How to use the keychain for the passphrase

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If you use an SSH identity to connect to remote hosts, chances are you dislike typing the passphrase over and over again (especially with GitHub).

$ git pull
Enter passphrase for key '/Users/fti/.ssh/id_rsa':

You could certainly use an empty passphrase, but there's a better way. You can actually configure the SSH client to use your keychain instead, by creating ~/.ssh/config (I set the mode to 600):

Host *
    UseKeychain yes
    AddKeysToAgent yes

Then, at the next connection, your password will be saved!

$ ssh-add -l
The agent has no identities.
$ git pull
Enter passphrase for key '/Users/fti/.ssh/id_rsa': 
remote: Counting objects: 122, done.
remote: Compressing objects: 100% (15/15), done.
[...snip...]
 2 files changed, 2 insertions(+), 22 deletions(-)
$ ssh-add -l
2048 SHA256:1M1I1LTcAM1IA+WdfX/ch8QzJeObHcAAcM1Idfc2gy1I1  (RSA)
$
$ ssh-add -l
2048 SHA256:1M1I1LTcAM1IA+WdfX/ch8QzJeObHcAAcM1Idfc2gy1I1  (RSA)
$ git pull
Already up to date.
$