https://blog.rnds.pro/rufus

rufus_2.rb

require 'rufus-scheduler'
require 'lusnoc/mutex'

mutex = Lusnoc::Mutex.new('/locks/jobs', ttl: 20)

mutex.synchronize(timeout: 10) do |mx|
  scheduler = Rufus::Scheduler.new.tap do |s|
 
    mx.on_mutex_lost do
      exit!(1)
    end

    s.every '10s' do
      mx.renew
    end
    
    s.in '1h' do
      RefreshCurrencyJob.perform_later
    end
  end
  
  sleep 5 while scheduler.up? && mx.alive?
end