SSH tunnel with Systemd service
This is a service unit I use to setup my ssh tunnels. Save it under ''$HOME/.config/systemd/user/autossh@.service'' for example.
[Unit] Description=SSH Tunnel %i # This whole mess is so the service won't start until WiFi is online. Wants=network-online.target NetworkManager-wait-online.service After=network.target network-online.target NetworkManager-wait-online.service [Service] Type=exec ExecStart=/usr/bin/ssh -vCN -o "ExitOnForwardFailure yes" %i KillMode=process Restart=always RestartSec=5 [Install] WantedBy=multi-user.target
That way I can restart a specific tunnel like ''systemctl --user restart autossh@tunnel1''.
And since it runs as my user the tunnel1 ssh config is in ''$HOME/.ssh'' as is custom.
I don't know of a way to write dependencies between the tunnels but it doesn't matter much because the tunnels I have that depend on other tunnels will restart every 5 seconds until they're live.
To figure out your dependencies in After and Wants you can run this command.
$ systemctl is-enabled NetworkManager-wait-online.service systemd-networkd-wait-online.service enabled disabled
Only one of those should be enabled, that's the one you should use as a dependency. I've input both to be on the safe side.