I am not very used to sys admin and recently created an SSH tunnel between two servers (on Ubuntu 12.4) with the following command:
ssh -fNg -L 3307:127.0.0.1:3306 email@example.com
It worked, I also added this command to /etc/rc.local, and it successfully launch the SSH tunnel at startup. However, I tried to add my tunnel in a file in /etc/init/my_tunnel.conf, and it worked but launched nearly 12 tunnels at every startup! I used the following code:
start on (local-filesystems and net-device-up IFACE=eth0) stop on runlevel respawn exec ssh -fNg -L 3307:127.0.0.1:3306 firstname.lastname@example.org exit 0
I spent hours on this and do not understand at all why and how this script is executed so many times. I also tried
start on, completely read upstart's manual but still the same. I am sure that I am missing something here.
If someone can help me. Thanks.