Ubuntu, upstart, and creating a pid for monitoring

Question

Below is a upstart script for redis. How to I create a pid so I use monit for monitoring?

#!upstart
description \"Redis Server\"

env USER=redis

start on s         


        

Answer 1

Egg's 1st example with start-stop-daemon is way to go.

If You choose 2nd, I would suggest $$ to obtain the PID.

#!upstart
description "Redis Server"

env USER=redis

start on startup
stop on shutdown

respawn

script
    echo $$ > /var/run/app_name.pid
    exec sudo -u $USER sh -c "/usr/local/bin/redis-server /etc/redis/redis.conf 2>&1 >> /var/log/redis/redis.log"
end script

post-stop script
    rm -f /var/run/app_name.pid
end script