unicorn example

unicorn.conf

## development
# app_path = `pwd`.strip
# app_shared_path = app_path
# app_current_path = app_path
# master_port = 4000

## production
app_path = '/srv/deploy/ufolio'
app_shared_path = "#{app_path}/shared"
app_current_path = "#{app_path}/current"
master_port = 4090

# at least equal "cat /proc/cpuinfo | grep vendor_id | wc -l"
worker_processes 2

working_directory app_current_path

listen "#{app_shared_path}/tmp/sockets/unicorn.sock", backlog: 64
listen master_port, tcp_nopush: true

timeout 30

pid "#{app_shared_path}/tmp/pids/unicorn.pid"

stderr_path "#{app_shared_path}/log/unicorn.stderr.log"
stdout_path "#{app_shared_path}/log/unicorn.stdout.log"

preload_app true
GC.respond_to?(:copy_on_write_friendly=) and
  GC.copy_on_write_friendly = true

check_client_connection false

# http://unicorn.bogomips.org/Unicorn/Configurator.html#method-i-before_exec
before_exec do |server|
  ENV['BUNDLE_GEMFILE'] ||= "#{app_current_path}/Gemfile"
end

before_fork do |server, worker|
  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.connection.disconnect!

  old_pid = "#{server.config[:pid]}.oldbin"
  if old_pid != server.pid
    begin
      sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
      Process.kill(sig, File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH
    end
  end

  sleep 1
end

after_fork do |server, worker|
  worker_address = "127.0.0.1:#{master_port + worker.nr + 1}"
  server.listen(worker_address, tries: -1, delay: 5, tcp_nopush: true)

  worker_pid = server.config[:pid].sub('.pid', ".#{worker.nr}.pid")
  system "echo #{Process.pid} > #{worker_pid}"

  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.establish_connection
end