rubycas-server/config/unicorn.rb

# Sample configuration file for Unicorn (not Rack)
#
# See http://unicorn.bogomips.org/Unicorn/Configurator.html for complete
# documentation.
SINATRA_ROOT = `pwd`.strip

# Use at least one worker per core if you're on a dedicated server,
# more will usually help for _short_ waits on databases/caches.
worker_processes 3

# Help ensure your application will always spawn in the symlinked
# "current" directory that Capistrano sets up.
working_directory SINATRA_ROOT # available in 0.94.0+

# listen on both a Unix domain socket and a TCP port,
# we use a shorter backlog for quicker failover when busy
# listen "/tmp/.sock", :backlog => 64
listen 18889, :tcp_nopush => true

# nuke workers after 30 seconds instead of 60 seconds (the default)
timeout 30

# feel free to point this anywhere accessible on the filesystem

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

# relative_path "/test_platform"
# some applications/frameworks log to stderr or stdout, so prevent
# them from going to /dev/null when daemonized here:
stderr_path "#{SINATRA_ROOT}/log/unicorn.stderr.log"
stdout_path "#{SINATRA_ROOT}/log/unicorn.stdout.log"

# combine REE with "preload_app true" for memory savings
# http://rubyenterpriseedition.com/faq.html#adapt_apps_for_cow
preload_app false
GC.respond_to?(:copy_on_write_friendly=) and
  GC.copy_on_write_friendly = true

before_fork do |server, worker|
  # the following is highly recomended for Rails + "preload_app true"
  # as there's no need for the master process to hold a connection
  # defined?(ActiveRecord::Base) and
  #   ActiveRecord::Base.connection.disconnect!

  # The following is only recommended for memory/DB-constrained
  # installations.  It is not needed if your system can house
  # twice as many worker_processes as you have configured.
  #
  # # This allows a new master process to incrementally
  # # phase out the old master process with SIGTTOU to avoid a
  # # thundering herd (especially in the "preload_app false" case)
  # # when doing a transparent upgrade.  The last worker spawned
  # # will then kill off the old master process with a SIGQUIT.
  old_pid = "#{server.config[:pid]}.oldbin"
  
  puts 'pid:'
  puts '-------------------'
  puts server.pid
  puts old_pid
  puts '---------------------'
  
  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
  #
  # # *optionally* throttle the master from forking too quickly by sleeping
  sleep 1
end

after_fork do |server, worker|
  # per-process listener ports for debugging/admin/migrations
  # addr = "127.0.0.1:#{9293 + worker.nr}"
  # server.listen(addr, :tries => -1, :delay => 5, :tcp_nopush => true)

  # the following is *required* for Rails + "preload_app true",
  # defined?(ActiveRecord::Base) and
  #   ActiveRecord::Base.establish_connection

  # if preload_app is true, then you may also want to check and
  # restart any other shared sockets/descriptors such as Memcached,
  # and Redis.  TokyoCabinet file handles are safe to reuse
  # between any number of forked children (assuming your kernel
  # correctly implements pread()/pwrite() system calls)
end