CODEWITHSUNDEEP
rubyruby-on-rails-3rakemonitoringmonit
RubyRedGrapefruit
RubyRedGrapefruit

Reputation: 12224

How can I create a monit process for a Ruby program?

I have these rake tasks that will occasionally fail. I want to use monit to monitor them and to restart them if necessary.

I have read the other ruby/monit threads on StackOverflow. My case is different in that these programs require my Rails environment in order to work. That's why I have them as rake tasks now.

Here is one of the tasks I need to monitor, in it's entirety:

task(process_updates: :environment) do
  `echo "#{Process.pid}" > #{Rails.root}/log/process_alerts.pid`
  `echo "#{Process.ppid}" > #{Rails.root}/log/process_alerts.ppid`
  SynchronizationService::process_alerts
end

My question is, do I leave this as a rake task, since SynchronizationService::process_alerts requires the Rails environment to work? Or is there some other wrapper I should invoke and then just run some *.rb file?

Upvotes: 0

Views: 530

Answers (1)

rindek
rindek

Reputation: 126

Monit can check for running pid, since you're creating pid when you run task you can create a monit config which should look something like this:

check process alerts with pidfile RAILSROOT/log/process_alerts.pid
  start program = "cd PATH_TO_APP; rake YOURTASK" with timeout 120 seconds
  alert [email protected] on { nonexist, timeout }

Of course RAILSROOT, PATH_TO_APP, YOURTASK should correspond to your paths/rake task.

Monit then will check for running process in system using the pidfile value and will start the process using start program command if it can't find running process.

Upvotes: 1

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