supervisord ＋ unicornでhot restart (deploy) するを参考にunicornherderを使ってみる。
Install
pip install unicornherder
Unicorn
gem 'unicorn'
config/unicorn.rb
# -*- coding: utf-8 -*-
worker_processes Integer(ENV['WEB_CONCURRENCY'] || 2)
timeout 150
preload_app false
listen '/tmp/unicorn.sock'
pid '/tmp/unicorn.pid'
stderr_path File.expand_path('log/unicorn.log', ENV['RAILS_ROOT'])
stdout_path File.expand_path('log/unicorn.log', ENV['RAILS_ROOT'])
unicornherderで起動しない場合
bundle exec unicorn_rails -c config/unicorn.rb -D
プロセス確認(before)
vagrant@vagrant-ubuntu-trusty-64:~/sample$ ps -ef | grep unicorn
vagrant 3857 1533 0 17:09 pts/4 00:00:00 tail -f log/unicorn.log
vagrant 3867 1 0 17:09 ? 00:00:00 unicorn_rails master -c config/unicorn.rb -D
vagrant 3923 3867 0 17:11 ? 00:00:01 unicorn_rails worker[1] -c config/unicorn.rb -D
vagrant 3926 3867 0 17:11 ? 00:00:01 unicorn_rails worker[0] -c config/unicorn.rb -D
vagrant 3979 551 0 17:18 pts/1 00:00:00 grep --color=auto unicorn
シグナル送ってみる
vagrant@vagrant-ubuntu-trusty-64:~/sample$ kill -HUP 3867
リロードされる
log/unicorn.log
I, [2016-06-22T17:20:09.214116 #3867] INFO -- : reloading config_file=config/unicorn.rb
I, [2016-06-22T17:20:09.220745 #3867] INFO -- : done reloading config_file=config/unicorn.rb
I, [2016-06-22T17:20:09.245587 #3867] INFO -- : reaped #<Process::Status: pid 3923 exit 0> worker=1
I, [2016-06-22T17:20:09.246027 #3867] INFO -- : worker=1 spawning...
I, [2016-06-22T17:20:09.246809 #3867] INFO -- : reaped #<Process::Status: pid 3926 exit 0> worker=0
I, [2016-06-22T17:20:09.247190 #3867] INFO -- : worker=0 spawning...
I, [2016-06-22T17:20:09.248149 #4014] INFO -- : worker=1 spawned pid=4014
I, [2016-06-22T17:20:09.248491 #4014] INFO -- : Refreshing Gem list
I, [2016-06-22T17:20:09.253035 #4016] INFO -- : worker=0 spawned pid=4016
I, [2016-06-22T17:20:09.253528 #4016] INFO -- : Refreshing Gem list
I, [2016-06-22T17:20:11.482024 #4014] INFO -- : worker=1 ready
I, [2016-06-22T17:20:11.485565 #4016] INFO -- : worker=0 ready
プロセス確認（after）
リロードされてworkerのプロセスIDだけ変わる（masterのプロセスIDは同じ）
vagrant@vagrant-ubuntu-trusty-64:~/sample$ ps -ef | grep unicorn
vagrant 3857 1533 0 17:09 pts/4 00:00:00 tail -f log/unicorn.log
vagrant 3867 1 0 17:09 ? 00:00:00 unicorn_rails master -c config/unicorn.rb -D
vagrant 4014 3867 4 17:20 ? 00:00:01 unicorn_rails worker[1] -c config/unicorn.rb -D
vagrant 4016 3867 4 17:20 ? 00:00:01 unicorn_rails worker[0] -c config/unicorn.rb -D
vagrant 4021 551 0 17:20 pts/1 00:00:00 grep --color=auto unicorn
unicornherderで起動した場合
bundle exec unicornherder -u unicorn_rails -p /tmp/unicorn.pid -- -c config/unicorn.rb
--のあとにunicorn_railsに渡していたパラメータつければいいみたい
プロセス確認(before)
vagrant 4085 1462 2 17:34 pts/3 00:00:00 /usr/bin/python /usr/local/bin/unicornherder -u unicorn_rails -p /tmp/unicorn.pid -- -c config/unicorn.rb
vagrant 4092 1 0 17:34 ? 00:00:00 unicorn_rails master -D -c config/unicorn.rb
vagrant 4095 4092 12 17:34 ? 00:00:01 unicorn_rails worker[0] -D -c config/unicorn.rb
vagrant 4097 4092 12 17:34 ? 00:00:01 unicorn_rails worker[1] -D -c config/unicorn.rb
シグナル送ってみる（unicornherderの方に送る）
vagrant@vagrant-ubuntu-trusty-64:~/sample$ kill -HUP 4085
Unicorn_Rails changed PID (was 4092, now 4104)って出る。
vagrant@vagrant-ubuntu-trusty-64:~/sample$ bundle exec unicornherder -u unicorn_rails -p /tmp/unicorn.pid -- -c config/unicorn.rb
2016-06-22 17:34:26,527 INFO Unicorn_Rails booted (PID 4092)
2016-06-22 17:35:11,476 INFO Caught HUP: gracefully restarting PID 4092
2016-06-22 17:35:13,479 INFO Unicorn_Rails changed PID (was 4092, now 4104)
ログを見るとリロードじゃなくてforked child re-executing...になる
log/unicorn.log
I, [2016-06-22T17:35:11.481850 #4104] INFO -- : executing ["/home/vagrant/sample/vendor/bundle/ruby/2.3.0/bin/unicorn_rails", "-D", "-c", "config/unicorn.rb", {10=>#<Kgio::UNIXServer:/tmp/unicorn.sock>}] (in /home/vagrant/sample)
I, [2016-06-22T17:35:11.482666 #4104] INFO -- : forked child re-executing...
I, [2016-06-22T17:35:11.736018 #4104] INFO -- : inherited addr=/tmp/unicorn.sock fd=10
I, [2016-06-22T17:35:11.737805 #4104] INFO -- : worker=0 spawning...
I, [2016-06-22T17:35:11.739196 #4104] INFO -- : worker=1 spawning...
I, [2016-06-22T17:35:11.739949 #4104] INFO -- : master process ready
I, [2016-06-22T17:35:11.740738 #4108] INFO -- : worker=0 spawned pid=4108
I, [2016-06-22T17:35:11.741065 #4108] INFO -- : Refreshing Gem list
I, [2016-06-22T17:35:11.747837 #4110] INFO -- : worker=1 spawned pid=4110
I, [2016-06-22T17:35:11.748172 #4110] INFO -- : Refreshing Gem list
I, [2016-06-22T17:35:13.840608 #4108] INFO -- : worker=0 ready
I, [2016-06-22T17:35:13.843696 #4110] INFO -- : worker=1 ready
masterのプロセスが二つになる（oldとnew）
vagrant 4085 1462 0 17:34 pts/3 00:00:00 /usr/bin/python /usr/local/bin/unicornherder -u unicorn_rails -p /tmp/unicorn.pid -- -c config/unicorn.rb
vagrant 4092 1 0 17:34 ? 00:00:00 unicorn_rails master (old) -D -c config/unicorn.rb
vagrant 4095 4092 1 17:34 ? 00:00:01 unicorn_rails worker[0] -D -c config/unicorn.rb
vagrant 4097 4092 1 17:34 ? 00:00:01 unicorn_rails worker[1] -D -c config/unicorn.rb
vagrant 4101 1533 0 17:34 pts/4 00:00:00 tail -f log/unicorn.log
vagrant 4104 4092 3 17:35 ? 00:00:00 unicorn_rails master -D -c config/unicorn.rb
vagrant 4108 4104 12 17:35 ? 00:00:01 unicorn_rails worker[0] -D -c config/unicorn.rb
vagrant 4110 4104 12 17:35 ? 00:00:01 unicorn_rails worker[1] -D -c config/unicorn.rb
しばらくするとoldが消えて新しい方のmasterだけ残る
vagrant 4085 1462 0 17:34 pts/3 00:00:00 /usr/bin/python /usr/local/bin/unicornherder -u unicorn_rails -p /tmp/unicorn.pid -- -c config/unicorn.rb
vagrant 4101 1533 0 17:34 pts/4 00:00:00 tail -f log/unicorn.log
vagrant 4104 1 0 17:35 ? 00:00:00 unicorn_rails master -D -c config/unicorn.rb
vagrant 4108 4104 0 17:35 ? 00:00:01 unicorn_rails worker[0] -D -c config/unicorn.rb
vagrant 4110 4104 0 17:35 ? 00:00:01 unicorn_rails worker[1] -D -c config/unicorn.rb
hot restartできそう。