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Ingredients to monitor Resque with God automatically via Capistrano (on Ubuntu)

How to monitor Resque with God and do it all with Capistrano on Ubuntu

Published on Rendered Text blog. Credit to thbar's original gist - GitHub prevented me of just forking it with 404s.

First, install god gem:

sudo gem install god

Create a master configuration file and prepare it for loading the instructions for Resque:

sudo mkdir /etc/god
sudo vim /etc/god/master.conf

Make god a service that runs on boot:

sudo cp god-service /etc/init.d
sudo chmod +x /etc/init.d/god-service
sudo update-rc.d god-service defaults

At this point you're able to do /etc/init.d/god-service start|stop|status.

Prepare your app's resque-#{environment}.god (I haven't figured out how to have one file handle multiple environments).

Add the deploy task to your Capistrano file. It assumes that your deploy user has passwordless sudo permissions. To do that, run visudo and enter

%deployuser         ALL = (ALL) NOPASSWD: ALL

At this point cap deploy should Just Work™.

namespace :deploy do
desc "Hot-reload God configuration for the Resque worker"
task :reload_god_config do
sudo "god stop resque"
sudo "god load #{File.join(deploy_to, 'current', 'config', 'resque-' + rails_env + '.god')}"
sudo "god start resque"
end
end
# append to the bottom:
after :deploy, "deploy:reload_god_config"
#!/bin/bash
#
# god Startup script for god (http://god.rubyforge.org)
#
# chkconfig: - 85 15
# description: God is an easy to configure, easy to extend monitoring \
# framework written in Ruby.
#
CONF_DIR=/etc/god
GOD_BIN=/usr/bin/god
RUBY_BIN=/usr/bin/ruby
RETVAL=0
# Go no further if config directory is missing.
[ -d "$CONF_DIR" ] || exit 0
case "$1" in
start)
# Create pid directory
$RUBY_BIN $GOD_BIN -c $CONF_DIR/master.conf
RETVAL=$?
;;
stop)
$RUBY_BIN $GOD_BIN terminate
RETVAL=$?
;;
restart)
$RUBY_BIN $GOD_BIN terminate
$RUBY_BIN $GOD_BIN -c $CONF_DIR/master.conf
RETVAL=$?
;;
status)
$RUBY_BIN $GOD_BIN status
RETVAL=$?
;;
*)
echo "Usage: god {start|stop|restart|status}"
exit 1
;;
esac
exit $RETVAL
load "/home/user/my-app/current/config/resque.god"
God.watch do |w|
w.name = 'resque'
w.interval = 30.seconds
w.env = { 'RAILS_ENV' => 'production', 'QUEUE' => '*' }
w.uid = 'deployuser'
w.gid = 'deployuser'
w.dir = File.expand_path(File.join(File.dirname(__FILE__),'..'))
w.start = "bundle exec rake jobs:work"
w.start_grace = 10.seconds
w.log = File.expand_path(File.join(File.dirname(__FILE__), '..','log','resque-worker.log'))
# restart if memory gets too high
w.transition(:up, :restart) do |on|
on.condition(:memory_usage) do |c|
c.above = 200.megabytes
c.times = 2
end
end
# determine the state on startup
w.transition(:init, { true => :up, false => :start }) do |on|
on.condition(:process_running) do |c|
c.running = true
end
end
# determine when process has finished starting
w.transition([:start, :restart], :up) do |on|
on.condition(:process_running) do |c|
c.running = true
c.interval = 5.seconds
end
# failsafe
on.condition(:tries) do |c|
c.times = 5
c.transition = :start
c.interval = 5.seconds
end
end
# start if process is not running
w.transition(:up, :start) do |on|
on.condition(:process_running) do |c|
c.running = false
end
end
end
require 'resque/tasks'
task "resque:setup" => :environment do
ENV["QUEUES"] = "critical,high,low"
end
desc "Alias for resque:work (to let us imagine that we are on Heroku)"
task "jobs:work" => "resque:work"
@kevinrutherford
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kevinrutherford commented Aug 17, 2012

Great work, thanks!
Have I misunderstood, or should the master configuration file point to "/home/user/my-app/current/config/resque-production.god" instead?

@laspluviosillas
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laspluviosillas commented Sep 17, 2012

This is very useful, thanks.

@dentarg
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dentarg commented Mar 17, 2013

Is it a typo in master.conf? I'm thinking about "resque.god".

@didil
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didil commented Sep 26, 2013

great thanks

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