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monitor-redis-resque.rb
Ruby
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# Redis
God.watch do |w|
w.name = "redis"
w.interval = 30.seconds
w.start = "/etc/init.d/redis start"
w.stop = "/etc/init.d/redis stop"
w.restart = "/etc/init.d/redis restart"
w.start_grace = 10.seconds
w.restart_grace = 10.seconds
 
#this depends on an /etc/init.d/redis script that handles creating a pid file here
w.pid_file = '/var/run/redis.pid'
 
w.behavior(:clean_pid_file)
 
w.start_if do |start|
start.condition(:process_running) do |c|
c.interval = 5.seconds
c.running = false
end
end
end
 
# Resque
God.watch do |w|
w.name = "resque-1.8.0"
w.interval = 30.seconds
w.start = "cd /var/www/apps/firefly/current && rake environment RAILS_ENV=production resque:work QUEUE=high,medium,low"
w.start_grace = 10.seconds
# retart if memory gets too high
w.transition(:up, :restart) do |on|
on.condition(:memory_usage) do |c|
c.above = 350.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

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