Deploy stack

Capfile

# Capfile

# Load DSL and set up stages
require 'capistrano/setup'

# Include default deployment tasks
require 'capistrano/deploy'

require 'capistrano/rails'

require 'capistrano/rbenv'

# Load custom tasks from `lib/capistrano/tasks` if you have any defined
Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }

deploy.rb

# config/deploy.rb

set :application, 'APP NAME'
set :repo_url, 'git@github.com:prograils/getwolfpack.git'
set :rbenv_type, :user # or :system, depends on your rbenv setup
set :rbenv_ruby, File.read('.ruby-version').strip
set :rbenv_prefix, "RBENV_ROOT=#{fetch(:rbenv_path)} RBENV_VERSION=#{fetch(:rbenv_ruby)} #{fetch(:rbenv_path)}/bin/rbenv exec"
set :rbenv_map_bins, %w{unicorn rake gem bundle ruby rails}
set :rbenv_roles, :all # default value

set :scm, :git

set :format, :pretty

set :linked_files, fetch(:linked_files, []).concat(%w(config/database.yml .env))
set :linked_dirs, fetch(:linked_dirs, []).concat(%w(log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system public/uploads))

set :keep_releases, 5

namespace :deploy do
  after :finishing, 'deploy:cleanup'
  after :publishing, 'deploy:restart'
end

production.rb

# config/deploy/production.rb

set :stage, :production

set :deploy_to, '/home/prograilstutorial/wolfpackapp/'

set :branch, 'production'

# Simple Role Syntax
# ==================
# Supports bulk-adding hosts to roles, the primary
# server in each group is considered to be the first
# unless any hosts have the primary property set.
role :app, %w(prograilstutorial@testserver.prograils.com)
role :web, %w(prograilstutorial@testserver.prograils.com)
role :db,  %w(prograilstutorial@testserver.prograils.com)

namespace :deploy do
  desc 'Restart application'
  task :restart do
    on roles(:app), in: :sequence, wait: 5 do
      execute :service, 'unicorn_wolfpackapp_production restart'
    end
  end
end

unicorn.rb

# config/unicorn.rb

app_dir    = '/home/prograilstutorial/wolfpackapp/current'
shared_dir = '/home/prograilstutorial/wolfpackapp/shared'
worker_processes 2
working_directory app_dir

# Load app into the master before forking workers for super-fast
# worker spawn times
preload_app true

# nuke workers after 60 seconds (the default)
timeout 60

# listen on a Unix domain socket and/or a TCP port,

#listen 8080 # listen to port 8080 on all TCP interfaces
#listen "127.0.0.1:8080"  # listen to port 8080 on the loopback interface
listen "#{shared_dir}/tmp/unicorn.socket"

pid "#{shared_dir}/tmp/pids/unicorn.pid"
stderr_path "#{shared_dir}/log/unicorn.stderr.log"
stdout_path "#{shared_dir}/log/unicorn.stdout.log"

# 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_exec do |server|
  ENV['BUNDLE_GEMFILE'] = "#{app_dir}/Gemfile"
end

before_fork do |server, worker|
  # the following is highly recomended for Rails + "preload_app true"
  # as there's no need for the master process to hold a connection
  defined?(ActiveRecord::Base) and ActiveRecord::Base.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 = "#{server.config[:pid]}.oldbin"

  if File.exists?(old_pid) && server.pid != old_pid
    begin
      sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
      Process.kill(sig, 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

  defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
  # Redis and Memcached would go here but their connections are established
  # on demand, so the master never opens a socket
end

unicorn_wolfpackapp_production

#! /bin/bash
# /etc/init.d/unicorn_wolfpackapp_production

### BEGIN INIT INFO
# Provides:          unicorn
# Required-Start:    $local_fs $remote_fs $network $syslog
# Required-Stop:     $local_fs $remote_fs $network $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: starts the unicorn web server
# Description:       starts unicorn
### END INIT INFO

USER=prograilstutorial
APPDIR=wolfpackapp
STAGE=production
PATH=/home/$USER/.rbenv/bin:/home/$USER/.rbenv/shims:$PATH
DAEMON=unicorn
DAEMON_OPTS="-c /home/$USER/$APPDIR/current/config/unicorn-${STAGE}.rb -E $STAGE -D"
NAME=unicorn
DESC="Unicorn daemon for $USER / $APPDIR"
PID=/home/$USER/$APPDIR/shared/tmp/pids/unicorn.pid

case "$1" in
  start)
        CD_TO_APP_DIR="cd /home/$USER/$APPDIR/current"
        START_DAEMON_PROCESS="bundle exec $DAEMON $DAEMON_OPTS"

        echo -n "Starting $DESC: "
        if [ `whoami` = root ]; then
          su - $USER -c "$CD_TO_APP_DIR > /dev/null 2>&1 && $START_DAEMON_PROCESS"
        else
          $CD_TO_APP_DIR > /dev/null 2>&1 && $START_DAEMON_PROCESS
        fi
        echo "$NAME."
        ;;
  stop)
        echo -n "Stopping $DESC: "
        kill -QUIT `cat $PID`
        echo "$NAME."
        ;;
  restart)
        echo -n "Restarting $DESC: "
        kill -USR2 `cat $PID`
        echo "$NAME."
        ;;
  reload)
        echo -n "Reloading $DESC configuration: "
        kill -HUP `cat $PID`
        echo "$NAME."
        ;;
  *)
        echo "Usage: $NAME {start|stop|restart|reload}" >&2
        exit 1
        ;;
esac

exit 0

wolfpackapp_site

# /etc/nginx/sites-enabled/wolfpackapp_site

upstream app-workers {
    # fail_timeout=0 means we always retry an upstream even if it failed
    # to return a good HTTP response (in case the Unicorn master nukes a single worker for timing out).
    server unix:/home/prograilstutorial/wolfpackapp/shared/tmp/unicorn.socket fail_timeout=0;
}


server {
  server_name           getwolfpack.com;
  root                  /home/prograilstutorial/wolfpackapp/current/public;
  if ($http_transfer_encoding ~* chunked) {
    return 444;
  }

  location / {
    access_log          off;

    include proxy_params;
    proxy_redirect off;

    if (-f $request_filename) {
      access_log          off;
      expires             max;
      break;
    }

    if (-f $request_filename.html) {
      rewrite (.*) $1.html break;
    }

    if (!-f $request_filename) {
      proxy_pass          http://app-workers;
      break;
    }
  }
}