Forward SSH keys for Capistrano deploys

The other days I was setting up a virtual server for one of my projects and the deploy is handled with Capistrano and it complained about the SSH classic — Permission denied (publickey).

Usually I set up a new SSH key on the server and add it to Github or wherever I’m hosting my source code, but there is a much better way with SSH forwarding that doesn’t require adding any new keys. Edit .ssh/config on your local machine and add ForwardAgent yes for your server.

 Host example.com
    ForwardAgent yes

After that, your key to SSH agent on your local machine by running the following.

ssh-add ~/.ssh/id_rsa

If you are using Mac you’d have add your key after every restart of the system. To make it permanent, run the following line.

/usr/bin/ssh-add -K ~/.ssh/id_rsa

Now, every time you connect to the server with SSH your key is forwarded to that machine and it behaves as if it was physically present on that machine.

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