'ssh -R' won't run in /etc/rc.local

Question

I wrote the following command in /etc/rc.local:

ssh -R 32400:192.168.0.100:32400 root@marcin.com -N

but it won't start.

Any idea why?

You can't get an output of commands run in /etc/rc.local as they don't run in a terminal. I guess you want to run this in a terminal / tty once logged in right? Do you login using a GUI or using a tty? — kos, Sep 10 '15 at 17:05
this runs on Raspberry Pi and i want to run it as fast as RPi boots up — Marcin Marczyk, Sep 10 '15 at 17:07
Some clarifications: 1) Does it work if run from command line? 2) Does it ask for a password? — Eric Carvalho, Sep 10 '15 at 18:30
it works from command line, i have added rsa key to server as user and as root — Marcin Marczyk, Sep 10 '15 at 19:34

score 3 · Accepted Answer · answered Sep 10 '15 at 22:53

Maybe the network isn't ready yet, when rc.local is executed.

The following code will wait for the network before connecting:

(
until ping -nq -c3 W.X.Y.Z; do
   # Waiting for network
   sleep 5
done
ssh -R 32400:192.168.0.100:32400 root@marcin.com -N
)&

_{W.X.Y.Z is an IP address that is reachable and replies to pings. It maybe be the default gateway of your network, the Google DNS (8.8.8.8), etc.}

Code between parenthesis runs in a new shell, and the & makes it run in background. It won't block the execution of rc.local.

The commands between until and done will be repeated until the ping is successful, i.e., it gets a reply (i.e., the network is up).

For info rc.local was placed in /etc for me. I also had to ensure it was executable (sudo chmod 775 /etc/rc.local) and place #!/bin/sh -e at the top: https://askubuntu.com/questions/9853/how-can-i-make-rc-local-run-on-startup/401090#401090 — SharpC, Feb 08 '20 at 13:17

1 Answers1