upstart config for Rocket.Chat (work in Centos 6)

rocketchat.conf

description "rocketchat application server"

# Wait for mongod before starting rocketchat app··
start on (started mongod)
stop on runlevel [!2345]

# Automatically attempt to restart with finite limits
respawn
respawn limit 99 5

# Export necessary variables and start the Applications / Services
script
    export MONGO_URL="mongodb://user:password@localhost:27017/rocketchat"
    export ROOT_URL="https://rocketchat.example.com"
    export PORT=3000
    exec su -m -c "/usr/bin/node /opt/Rocket.Chat/main.js" rocketchat
end script