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Created January 7, 2010 18:47
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# unicorn_rails -c /home/deploy/public_html/rm/current/config/unicorn.rb -E production -D
working_directory = '/home/deploy/public_html/rm/current'
rails_env = ENV['RAILS_ENV'] || 'production'
worker_processes 6
# Load rails into the master before forking workers
# for super-fast worker spawn times
preload_app true
# Restart any workers that haven't responded in 30 seconds
timeout 60
# Listen on a Unix data socket
listen '/home/deploy/public_html/rm/current/tmp/sockets/unicorn.sock', :backlog => 2048
stdout_path '/home/deploy/public_html/rm/current/log/unicorn.log'
stderr_path '/home/deploy/public_html/rm/current/log/unicorn-error.log'
##
# REE
# http://www.rubyenterpriseedition.com/faq.html#adapt_apps_for_cow
if GC.respond_to?(:copy_on_write_friendly=)
GC.copy_on_write_friendly = true
end
before_fork do |server, worker|
ActiveRecord::Base.connection.disconnect!
LegacyModel.connection.disconnect!
##
# When sent a USR2, Unicorn will suffix its pidfile with .oldbin and
# immediately start loading up a new version of itself (loaded with a new
# version of our app). When this new Unicorn is completely loaded
# it will begin spawning workers. The first worker spawned will check to
# see if an .oldbin pidfile exists. If so, this means we've just booted up
# a new Unicorn and need to tell the old one that it can now die. To do so
# we send it a QUIT.
#
# Using this method we get 0 downtime deploys.
old_pid = RAILS_ROOT + '/tmp/pids/unicorn.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|
##
# Unicorn master loads the app then forks off workers - because of the way
# Unix forking works, we need to make sure we aren't using any of the parent's
# sockets, e.g. db connection
ActiveRecord::Base.establish_connection
LegacyModel.establish_connection(LegacyModel.connection_name)
addr = "127.0.0.1:#{9293 + worker.nr}"
server.listen(addr, :tries => -1, :delay => 5, :tcp_nopush => true)
##
# Unicorn master is started as root, which is fine, but let's
# drop the workers to deploy:deploy
begin
uid, gid = Process.euid, Process.egid
user, group = 'deploy', 'deploy'
target_uid = Etc.getpwnam(user).uid
target_gid = Etc.getgrnam(group).gid
worker.tmp.chown(target_uid, target_gid)
if uid != target_uid || gid != target_gid
Process.initgroups(user, target_gid)
Process::GID.change_privilege(target_gid)
Process::UID.change_privilege(target_uid)
end
rescue => e
if RAILS_ENV == 'development'
STDERR.puts "couldn't change user, oh well"
else
raise e
end
end
end
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