Systemd service for ssh port forwards
enable persistent processes for user
sudo loginctl enable-linger
systemd user location is ~/.config/systemd/user/
cp ssh-fw@.service ~/.config/systemd/user/
add service to systemd --user services autostart
systemctl --user enable ssh-fwd@my_configuration
user configurations are expected in ~/.ssh/port-fwd.d/
the configuration have the following format :
TARGET=-p custom_port user@host
PORT_LOCAL=local_port
PORT_REMOTE=remote_port
OPTS=any other options
!!! N.B. !!!
this is not a shell sourced file
Environment variables in systemd are handled differently if used with ${MYVAR} or with $MYVAR.
${MYVAR} will provide the target process with a single string argument made of the complete string you specified in MYVAR.
$MYVAR in the other hand will split MYVAR around spaces it contains and feed them to the process.
https://www.freedesktop.org/software/systemd/man/systemd.exec.html#EnvironmentFile=
https://www.freedesktop.org/software/systemd/man/systemd.exec.html#Environment=