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Created October 9, 2009 18:56
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# unicorn_rails -c /data/github/current/config/unicorn.rb -E production -D
rails_env = ENV['RAILS_ENV'] || 'production'
# 16 workers and 1 master
worker_processes (rails_env == 'production' ? 16 : 4)
# Load rails+github.git 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 30
# Listen on a Unix data socket
listen '/data/github/current/tmp/sockets/unicorn.sock', :backlog => 2048
if GC.respond_to?(:copy_on_write_friendly=)
GC.copy_on_write_friendly = true
before_fork do |server, worker|
# 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/'
if File.exists?(old_pid) && != old_pid
rescue Errno::ENOENT, Errno::ESRCH
# someone else did our job for us
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
# Redis and Memcached would go here but their connections are established
# on demand, so the master never opens a socket
# Unicorn master is started as root, which is fine, but let's
# drop the workers to git:git
uid, gid = Process.euid, Process.egid
user, group = 'git', 'git'
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)
rescue => e
if RAILS_ENV == 'development'
STDERR.puts "couldn't change user, oh well"
raise e
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In Rails 5, we are getting the following error on unicorn startup:

E, [2018-07-26T13:37:13.612803 #22645] ERROR -- : undefined method `tmp' for #<Unicorn::Worker:0x00000003fa4008>
Did you mean?  tap (NoMethodError)
/u/app/current/config/environments/development/unicorn.rb:85:in `block in reload'
/usr/local/rvm/gems/ruby-2.4.1/gems/unicorn-5.4.1/lib/unicorn/http_server.rb:654:in `init_worker_process'

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