monitor rake task with god. ref: http://makandracards.com/makandra/2371-monitor-a-rake-task-with-god

my_task.rb

task :my_task => :environment do
  File.open(ENV['PIDFILE'], 'w') { |f| f << Process.pid } if ENV['PIDFILE']
  Model.perform_task!
end

run.sh

god -c run_rake_task.god -D

run_rake_task.god

God.watch do |w|
  w.dir = "#{rails_root}"
  w.name = "my_task"
  w.interval = 10.seconds
  w.pid_file = "#{rails_root}/tmp/pids/#{w.name}.pid"
  w.env = {"RAILS_ENV"=>rails_env, 'PIDFILE' => w.pid_file}
  w.start = "bundle exec rake my_task &"
  ...
end