Unicorn + Upstart + Capistrano 3

000 :: Unicorn + Upstart + Capistrano 3 :: README.md

Unicorn + Upstart + Capistrano 3

Based on http://orchestrate.io/blog/2014/03/26/tip-seamless-restarts-with-unicorn-and-upstart/

• On reboot Upstart launches Unicorn
• When Unicorn crashes is automatically relaunched
• sudo service unicorn start/stop to start/stop the service
• cap unicorn:restart do manually restart Unicorn

config-deploy.rb

# ...

namespace :deploy do
  desc 'Restart application (duplicate)'
  task :restart do
    invoke 'unicorn:restart'
  end

  after :publishing, :restart
end

# ...

config-unicorn.rb

# ...

before_fork do |server, worker|
  f = File.open("#{server.config[:pid]}.lock", 'w')
  exit unless f.flock(File::LOCK_SH)
end

# ...

etc-init-unicorn.conf

description "Unicorn webserver control"
author "nebirhos <me@nebirhos.com>"

start on runlevel [2345]
stop on runlevel [016]
respawn

setuid username
setgid username

# points to your RBenv/RVM/whatever bin 
env PATH=./bin:./bin/stubs:/opt/rbenv/shims:/opt/rbenv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
env LOCKFILE_PATH=/myapp/current/tmp/pids/unicorn.pid.lock
env UNICORN_CONFIG_PATH=/myapp/current/current/config/unicorn.rb
env ENVIRONMENT=production

chdir /myapp/current

script
  bundle exec unicorn -c $UNICORN_CONFIG_PATH -E $ENVIRONMENT
  flock -x 0 < $LOCKFILE_PATH
end script

post-stop exec rm -f $LOCKFILE_PATH