My App unicorn.rb

unicorn.rb

app_path = "/u/apps/app_production"

# Set unicorn options
worker_processes 8
preload_app true
timeout 30
listen "#{app_path}/shared/tmp/sockets/unicorn.sock", :backlog => 2048

# Spawn unicorn master worker for user apps (group: apps)
user 'deploy', 'deploy'

# Fill path to your app
working_directory "#{app_path}/current"

# Should be 'production' by default, otherwise use other env
rails_env = ENV['RAILS_ENV'] || 'production'

# Log everything to one file
stderr_path "log/unicorn.log"
stdout_path "log/unicorn.log"

# Set master PID location
pid "#{app_path}/shared/tmp/pids/unicorn.pid"

before_exec do |server|
  Dotenv.overload
  ENV["BUNDLE_GEMFILE"] = "#{app_path}/current/Gemfile"
end

before_fork do |server, worker|
  ActiveRecord::Base.connection.disconnect! if defined? ActiveRecord::Base

  sleep 10

  old_pid = "#{server.config[:pid]}.oldbin"
  if File.exists?(old_pid) && server.pid != old_pid
    begin
      Process.kill("QUIT", File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH
      # someone else did our job for us
    end
  end
end

after_fork do |server, worker|
  ActiveRecord::Base.establish_connection if defined? ActiveRecord::Base

  if defined?(EventMachine)
    unless EventMachine.reactor_running? && EventMachine.reactor_thread.alive?
      if EventMachine.reactor_running?
        EventMachine.stop_event_loop
        EventMachine.release_machine
        EventMachine.instance_variable_set("@reactor_running",false)
      end
      Thread.new { EventMachine.run }
    end
  end

  Signal.trap("INT") { EventMachine.stop }
  Signal.trap("TERM") { EventMachine.stop }
end