Socket.IO Upstart job

socketio-worker.conf.sh

description "Socket.IO worker"
instance $NUM
 
stop on stopping socketio
respawn

limit nofile 10000 10000
respawn limit 99 5
kill timeout 5

env NUM=
env LOGFILE=/var/log/syslog

script
    export LANG=en_US.UTF-8
    export NODE_ENV=production 
    export NUM=$NUM
    # Notice: node can't handle env vars after itself
    # i.e.: node NUM=1
    # doesn't pass NUM env var into node process
    # So we put NUM only for informative ps auxf status
    exec start-stop-daemon --start -c socketio --exec /usr/bin/env -- node /var/data/socketio/app.js NUM=$NUM >> /var/log/socketio/worker-$NUM.log 2>&1
end script
 
pre-start script
    if [ -z $NUM ]; then
        echo "[`date`] socketio-worker ERROR: NUM param should be set" >> $LOGFILE
        echo "Usage: initctl start socketio-worker NUM=\$NUM" >> $LOGFILE
        echo "       where \$NUM is a number of worker" >> $LOGFILE
        stop; exit 0
    fi
    echo "Starting socketio-worker $UPSTART_INSTANCE: " `date` >> $LOGFILE
end script

post-stop script
    echo "Stopped socketio-worker $UPSTART_INSTANCE: " `date` >> $LOGFILE
end script