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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