unicorn.rb

GC.copy_on_write_friendly = true if GC.respond_to? :copy_on_write_friendly=

before_exec do |_|
  ENV['BUNDLE_GEMFILE'] = "#{@dir}/Gemfile"
end

before_fork do |server, _|
  old_pid = "#{server.config[:pid]}.oldbin"
  if File.exist?(old_pid) && server.pid != old_pid
    begin
      Process.kill('QUIT', File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH
    end
  end
end

after_fork do |_, _|
  Rails.cache.reset if Rails.cache.respond_to? :reset
  defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
end