I am running multiple instances of a worker as described in this answer: Starting multiple upstart instances automatically
Question: Can I restart all instances at once?
To start my workers I can do:
initctl start my-workers
Which then allows me to do:
initctl status worker N=1 worker (1) start/running, process 551
initctl status worker N=2 worker (2) start/running, process 552
Is there a way to do something like this:
initctl restart my-workers
I would like to be able to restart all instances without having to know how many are running.
Here is my my-workers.conf
start on stopped cloud-init
stop on shutdown
env NUM_WORKERS=4
script
for i in `seq 1 $NUM_WORKERS`
do
start worker N=$i
done
end script
And worker.conf
stop on shutdown
chdir /path/to/current
respawn
instance $N
script
exec su -c "/home/worker/.rvm/bin/rvm-shell -c 'bundle exec rake work 2>&1 >> /var/log/worker-$N.log'" worker
end script
In worker.conf you just need to change this line:
stop on shutdown
To:
stop on stopping my-workers
And change my-workers.conf to use pre-start instead of script:
pre-start script
for i in `seq 1 $NUM_WORKERS`
do
start worker N=$i
done
end script
Now my-workers will keep state: since the work happens in pre-start, the my-workers main process won't exist and so won't exit. stop on stopping my-workers causes the workers to stop whenever my-workers is stopped. Then of course when it starts up again it will start the workers again.
(FYI, stop on shutdown does nothing, as shutdown is not a system event. man upstart-events for all the defined events) so you should also change my-workers to stop on runlevel [06]