unicorn upstart job

Asked by Federico Ramallo on 2011-09-03

Hi,

I build an upstart job to run and unicorn server. But I have some issues tracking the correct pid.
I'm using upstart 0.6.5-8 on ubuntu 10.04

This is the job:
#!upstart
description "Gentlemans foro production site"
author "Federico Ramallo"

start on startup
stop on shutdown

chdir /home/gentlemans-foro
exec sudo -u gentlemans-foro -H -i -- 'cd ~/gentlemansforo ; export RAILS_ENV=production ; source .rvmrc; bundle exec unicorn_rails -p 3040 -c config/unicorn.rb -E production'
respawn

This is the current ps state when running the job above:

# initctl status gentlemans-foro.com.ar
gentlemans-foro.com.ar start/running, process 19536
# ps -Af | grep -P 'gentlemans|unicorn'
1006 6623 6508 0 13:15 pts/4 00:00:00 su gentlemans-foro
1006 19536 1 0 19:58 ? 00:00:00 -bash -c cd ~/gentlemansforo ; export RAILS_ENV=production ; source .rvmrc; bundle exec unicorn_rails -p 3040 -c config/unicorn.rb -E production
1006 19613 19536 3 19:58 ? 00:00:01 unicorn_rails master -p 3040 -c config/unicorn.rb -E production
1006 20161 19613 94 19:58 ? 00:00:04 unicorn_rails worker[0] -p 3040 -c config/unicorn.rb -E production

If I run unicorn on a bash script then upstart tracks the bash script pid.
If I run unicorn as daemon (same as above but using -D switch on unicorn command) upstart tracks the incorrect pid.
I tried both expect fork and expect daemon, but none work.

The script above works. And I track unicorn working with monit using the correct pid.
But I would like to set unicorn as daemon (-D) and reduce the amount of processes running.
Is it possible?

Also I would like to send a HUP signal to unicorn master process on a restart event. The reason for that is because unicorn can make a hot deployment when receive a HUP signal. If i kill the process and start it again then users could get an error during restart.

I tried a stanza to run the process as another user, but was not working at that time. Should I still use exec sudo?

Also I found that chdir was not working correctly, hence cd is my first command. Is this working on newer versions?

Thanks for your help!

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upstart Edit question
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Last query:
2011-09-03
Last reply:
2011-09-08

As suggested here (http://upstart.ubuntu.com/cookbook/#alternative-method) you can use start-stop-daemon to solve this issue.

Your upstart config file exec line should be something like this:

exec start-stop-daemon --start --exec su -- -c 'cd /home/gentlemans-foro/gentlemansforo; export RAILS_ENV=production; source .rvmrc; bundle exec unicorn_rails -p 3040 -c config/unicorn.rb -E production' gentlemans-foro

No need for expect fork or expect daemon.

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