SSH agent forwarding & screen

markdown/2016-02-28-ssh-agent-forwarding-screen.md

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+ssh-agent forwarding and screen not playing nicely is one of those things that I’ve dealt with so long that it just became routine. Resume a screen from a previous connection? Outgoing SSH won’t work, and that’s just the way it is. One day this week, I finally decided to see if I can fix it, and fortunately the Internet [provides](https://gist.github.com/martijnvermaat/8070533). That doc has a bunch of complexity about X forwarding, which I haven’t cared about in years, so here’s the distilled version. You’ll need to have already [set up agent forwarding](https://developer.github.com/guides/using-ssh-agent-forwarding/). On the host with your screen session:
+
+    tee ~/.ssh/rc <<'END'
+    if test "$SSH_AUTH_SOCK"; then
+      ln -sf $SSH_AUTH_SOCK ~/.ssh/ssh_auth_sock
+    fi
+    END
+	
+    tee -a ~/.screenrc <<END
+    setenv SSH_AUTH_SOCK $HOME/.ssh/ssh_auth_sock
+    END
+
+Reconnect, restart screen once, never worry about it again. Changing my life.
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