Upstart
"Upstart is an event-based replacement for the /sbin/init daemon which handles starting of tasks and services during boot, stopping them during shutdown and supervising them while the system is running." - http://upstart.ubuntu.com
Examples
Start multiple instances of the same services
http://upstart.ubuntu.com/cookbook/#instance
Master
start on runlevel [2345]
stop on runlevel [^2345]
respawn
env job_count=6
pre-start script
for i in $(seq -w 1 ${job_count}) ; do
start photoworker N=${i}
done
end script
post-stop script
for i in $(seq -w 1 ${job_count}) ; do
stop photoworker N=${i}
done
end script
Child
respawn
respawn limit 10 5
instance $N
env logfile="/var/log/worker_photoworker.log"
chdir /srv/photoworkers/current/web/services/jobworkers
pre-start exec bash -c "echo $(date --rfc-3339=seconds) beginning worker run >> ${logfile}"
exec su -s /bin/sh -c 'exec "$0" "$@"' php-worker -- php photoworker.php >> ${logfile} 2>&1
post-stop exec bash -c "echo $(date --rfc-3339=seconds) ended worker run >> ${logfile}"
Redirect all output of an upstart script to syslog
Found at http://serverfault.com/questions/114052/logging-a-daemons-output-with-upstart
script
FIFO=fifo.temp
mkfifo $FIFO
( logger -t myservice <$FIFO & )
exec > $FIFO
rm $FIFO
exec /usr/local/bin/myservice 2>&1
end script