Configuração de projeto rails (Spree Commerce) para deploy utilizando Capistrando e Unicorn

database.yml

# Database config shared in Capistrano 3: .../shared/config/database.yml

# MySQL.  Versions 5.0+ are recommended.
#
# Install the MYSQL driver
#   gem install mysql2
#
# Ensure the MySQL gem is defined in your Gemfile
#   gem 'mysql2'
#
# And be sure to use new-style password hashing:
#   http://dev.mysql.com/doc/refman/5.0/en/old-client.html
#
default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  host: 127.0.0.1
  socket: /var/run/mysqld/mysqld.sock
 
homol:
  <<: *default
  database: db_homol
  username: root
  password: my_pass

deploy.rb

# .../config/deploy.rb

# config valid only for Capistrano 3.1
lock '3.2.1'

set :application, 'spree_story'
set :repo_url, 'git@github.com:brasilct/spree_story.git'

# Default value for :scm is :git
set :scm, :git

# Default value for :format is :pretty
set :format, :pretty

# Default value for :log_level is :debug
set :log_level, :debug
set :ssh_options, {
    verbose: :debug
}

# Default value for :pty is false
set :pty, true

# Default value for :linked_files is []
set :linked_files, %w{config/database.yml}

# Default value for linked_dirs is []
set :linked_dirs, %w{bin log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system public/spree}

# Default value for default_env is {}
# set :default_env, { path: "/opt/ruby/bin:$PATH" }
set :default_shell, '/bin/bash --login'
set :use_sudo, false

namespace :deploy do

  desc 'Restart application'
  task :restart do
    invoke  'unicorn:restart'
    on roles(:app), in: :sequence, wait: 5 do
      # Your restart mechanism here, for example:
      execute :touch, release_path.join('tmp/restart.txt')
    end
  end
  after :publishing, :restart

  task :clear_cache do
    on roles(:web), in: :groups, limit: 3, wait: 10 do
      # Here we can do anything such as:
      within release_path do
        execute :rake, 'tmp:cache:clear'
      end
    end
  end
  after :restart, :clear_cache
  after :restart, :cleanup

end

namespace :spree do

  desc 'Add Spree User Admin'
  task :auth do
    on roles(:web) do
      # Here we can do anything such as:
      within release_path do
        execute :rake, 'spree_auth:admin:create'
      end
    end
  end

end

namespace :task do
  desc 'Execute the specific command. Ex. call: cap staging "task:invoke[db:migrate]"'
  task :invoke, :command do |task, args|
    on roles(:app) do
      within release_path do
        execute :rake, args[:command]
      end
    end
  end
end

homol.rb

# Staging de Capistrango: .../config/deploy/homol.rb

# 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.  Don't declare `role :all`, it's a meta role.

# role :app, %w{ubuntu@123.123.123.123}
# role :web, %w{ubuntu@123.123.123.123}
# role :db,  %w{ubuntu@123.123.123.123}


# Extended Server Syntax
# ======================
# This can be used to drop a more detailed server definition into the
# server list. The second argument is a, or duck-types, Hash and is
# used to set extended properties on the server.

# server '123.123.123.123', user: 'ubuntu', roles: %w{web app db}, my_property: :my_value


# Custom SSH Options
# ==================
# You may pass any option but keep in mind that net/ssh understands a
# limited set of options, consult[net/ssh documentation](http://net-ssh.github.io/net-ssh/classes/Net/SSH.html#method-c-start).
#
# Global options
# --------------
#  set :ssh_options, {
#    keys: %w(/home/rlisowski/.ssh/id_rsa),
#    forward_agent: false,
#    auth_methods: %w(password)
#  }
#
# And/or per server (overrides global)
# ------------------------------------
default_environment = :homol
app_name = 'spree_story'
host = '123.123.123.123'
host_user = 'my_user'
host_publickey_path = %w(~/.ssh/publickey)

# Default value for keep_releases is 5
set :keep_releases, 3

set :stage, default_environment

server host,
  user: host_user,
  roles: %w{web app db},
  ssh_options: {
    user: host_user, # overrides user setting above
    keys: host_publickey_path,
    forward_agent: false,
    auth_methods: %w(publickey password),
    # password: ''
  }

# Default deploy_to directory is /var/www/my_app
set :deploy_to, "/var/www/#{app_name}"

# Default branch is :master
# ask :branch, proc { `git rev-parse --abbrev-ref HEAD`.chomp }.call
set :branch, default_environment

# Rails specific options
set :rails_env, default_environment               # If the environment differs from the stage name
set :migration_role, :db                   # Defaults to 'db'
set :conditionally_migrate, false           # Defaults to false
set :assets_roles, [:web, :app]            # Defaults to [:web]
# set :assets_prefix, 'prepackaged-assets'   # Defaults to 'assets' this should match config.assets.prefix in your rails config/application.rb
# set :normalize_asset_timestamps, %{public/images public/javascripts public/stylesheets} # If you need to touch public/images, public/javascripts and public/stylesheets on each deploy

# RVM
set :rvm_type, :user
set :rvm_ruby_version, "2.1.2@#{app_name}"
set :rvm_custom_path, '/home/ubuntu/.rvm'

set :unicorn_rack_env, default_environment
set :unicorn_env, default_environment
set :unicorn_config_path, "config/unicorn/#{default_environment}.rb"

unicorn.rb

# Config de Unicorn: .../config/unicorn/homol.rb

app_name = "spree_story"
shared_path = "/var/www/#{app_name}/shared"
host_user = 'my_user'

# See http://unicorn.bogomips.org/Unicorn/Configurator.html for complete documentation.
worker_processes 4

# listen on both a Unix domain socket and a TCP port, 
# we use a shorter backlog for quicker failover when busy
listen "/tmp/unicorn.#{app_name}.socket", :backlog => 64

# Preload our app for more speed
preload_app true

# nuke workers after 30 seconds instead of 60 seconds (the default)
timeout 30

# Help ensure your application will always spawn in the symlinked
# "current" directory that Capistrano sets up.
working_directory "/var/www/#{app_name}/current"

# feel free to point this anywhere accessible on the filesystem
user host_user, host_user

# By default, the Unicorn logger will write to stderr.
# Additionally, some applications/frameworks log to stderr or stdout,
# so prevent them from going to /dev/null when daemonized here:
stderr_path "#{shared_path}/log/unicorn.stderr.log"
stdout_path "#{shared_path}/log/unicorn.stdout.log"

pid "#{shared_path}/tmp/pids/unicorn.pid"

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
  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.connection.disconnect!
  end

  # The following is only recommended for memory/DB-constrained
  # installations.  It is not needed if your system can house
  # twice as many worker_processes as you have configured.
  #
  # This allows a new master process to incrementally
  # phase out the old master process with SIGTTOU to avoid a
  # thundering herd (especially in the "preload_app false" case)
  # when doing a transparent upgrade.  The last worker spawned
  # will then kill off the old master process with a SIGQUIT.
  old_pid = "#{server.config[:pid]}.oldbin"
  if old_pid != server.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
    end
  end
end

after_fork do |server, worker|
  # the following is *required* for Rails + "preload_app true"
  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.establish_connection
  end

  # if preload_app is true, then you may also want to check and
  # restart any other shared sockets/descriptors such as Memcached,
  # and Redis.  TokyoCabinet file handles are safe to reuse
  # between any number of forked children (assuming your kernel
  # correctly implements pread()/pwrite() system calls)
end