Daemonizing DelayedJob from a rake task. Useful for using DelayedJob outside of Rails (Hizzah Padrino!) Note: Requires rake >= 10.1 for TaskArguments#extras

jobs.rake

namespace :jobs do
  desc <<-EOD
    Start delayed_job worker daemon. Requires passing start|stop|restart|reload|run|zap|status
    to rake via `rake jobs:daemon[start]`. To pass arguments to Delayed::Command, call rake
    like `rake jobs:daemon["--queue=something start"]` (Note the quotes wrapping the arguments!).
    Available flags are: queues queue min_priority max_priority number_of_workers pid-dir
    identifier monitor sleep-delay read-ahead prefix exit-on-complete
  EOD
  task :daemon, [:argv] => :environment do |t, args|
    # If we have anything in args.extras we need to combined it with args[:argv]
    # This lets us handle comma-separated values for --queues.
    fake_argv = [args[:argv], args.extras].flatten.compact.join(',')
    require 'delayed/command'
    Delayed::Command.new(Shellwords.shellwords fake_argv).daemonize
  end
end

You have to do a few other things to get it to work with Padrino. Namely, you have to fake Rails.root: Put module Rails; def self.root; Padrino.root; end; end in Padrino's boot.rb.