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jimmysoho / gist:534668

Last active 2014-03-07

# Our own variable where we deploy this app to
deploy_to = "/srv/example.com"
 
current_path = "#{deploy_to}/current"
shared_path = "#{deploy_to}/shared"
shared_bundler_gems_path = "#{shared_path}/bundler_gems"
 
# See http://unicorn.bogomips.org/Sandbox.html
# Helps ensure the correct unicorn_rails is used when upgrading with USR2
Unicorn::HttpServer::START_CTX[0] = "#{shared_bundler_gems_path}/bin/unicorn_rails"
 
# 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 2
 
# Help ensure your application will always spawn in the symlinked
# "current" directory that Capistrano sets up.
working_directory current_path
 
# listen on both a Unix domain socket and a TCP port,
# we use a shorter backlog for quicker failover when busy
listen "/tmp/.staging_unicorn_sock", :backlog => 64
#listen 8080, :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 "/var/run/staging_unicorn.pid"
pid "#{shared_path}/pids/unicorn.pid"
 
# By default, the Unicorn logger will write to stderr.
# Additionally, some applications/frameworks log to stderr or stdout,
# so prevent them from going to /dev/null when daemonized here:
stderr_path "#{shared_path}/log/unicorn.stderr.log"
stdout_path "#{shared_path}/log/unicorn.stdout.log"
 
# combine REE with "preload_app true" for memory savings
# http://rubyenterpriseedition.com/faq.html#adapt_apps_for_cow
preload_app true
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"
  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
 
  log_env(:before_fork, server)
end
 
after_fork do |server, worker|
  # worker.user('deployer', 'deployer') if Process.euid == 0
 
  # 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)
 
  # Reconnect memcached
  Rails.cache.reset
end
 
before_exec do |server|
  paths = (ENV["PATH"] || "").split(File::PATH_SEPARATOR) 
  paths.unshift "#{shared_bundler_gems_path}/bin"
  ENV["PATH"] = paths.uniq.join(File::PATH_SEPARATOR)
 
  ENV['GEM_HOME'] = ENV['GEM_PATH'] = shared_bundler_gems_path
  ENV['BUNDLE_GEMFILE'] = "#{current_path}/Gemfile"
end