Gunicorn init script

README.md

Includes a reload and update command.

Reload sends a SIGHUP to the gunicorn process. This does a graceful reload if the preload option isn't set.

Update sends a SIGUSR2 which starts a new master process. It then sends a QUIT to the old process, which gracefully shuts it down after all connections are closed. This works with the preload option.

I got the idea from Benoit's comment, here:

benoitc/gunicorn#402 (comment)

gunicorn

#!/bin/sh
# chkconfig: 345 85 15
# description: Starts gunicorn process

ENV="/home/sites"
SITE="mysite"
PORT=8050
USER="user"
PID="/var/run/gunicorn-${SITE}.pid"
WORKERS=4

COMMAND="$ENV/bin/gunicorn $SITE.wsgi:application -b 127.0.0.1:$PORT --user=$USER --pid=$PID --daemon -w $WORKERS -n gunicorn_$SITE --preload"


start()
{
    echo "Starting $SITE"
    su -c "$COMMAND" && echo "OK" || echo "failed";
}

stop()
{
    if [ -f $PID ]
    then
        kill -QUIT `cat $PID` && echo "OK" || echo "failed";
        echo "Stopping $SITE"
    else
        echo "Site $SITE is not running"
    fi
}

reload()
{
    if [ -f $PID ]
    then
        echo "Reloading $SITE:"
        kill -HUP `cat $PID` && echo "OK" || echo "failed";
    else
        echo "Site $SITE is not running"
    fi
}

update()
{
    echo "Switch process for $SITE (`cat $PID`)"

    local OLDPID="${PID}.oldbin"

    if [ ! -f ${OLDPID} ]
    then
        kill -s USR2 `cat "$PID"`
    fi

    sleep 1

    if [ ! -f ${OLDPID} ]
    then
        echo "New master process not started. Aborting."
        return 1
    fi

    if [ ! -f ${PID} ]
    then
        echo "No process running. Aborting."
        return 1
    fi

    kill -s QUIT `cat "$OLDPID"`

    echo "New process running for $SITE (`cat $PID`)"

    return 0
}

case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    restart)
        stop && start
        ;;
    reload)
        reload
        ;;
    update)
        update
        ;;
    *)
        echo $"Usage: $0 {start|stop|restart|reload}"
        RETVAL=1
esac
exit $RETVAL