I recently acquired a new 13″ Macbook Pro. My last machine was from 2012, so I’ve been having fun catching up on how you actually set up a functional developer environment today (it’s basically the same as in 2012).
I had to look up how to get OS X Sierra (10.12) to remember my SSH keys. This behavior has changed to mimic standard OpenSSH behavior, which is a good thing!
First, add the key to your OS X keychain:
ssh-add -k [key_file]
Then, when you start a shell, run this:
ssh-add -A
I added it to my .bash_profile and it’s working quite nicely.
Hilary Mason 