引入Capistrano 3进行自动化部署。

Capfile

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+# Load DSL and Setup Up Stages
+require 'capistrano/setup'
+
+# Includes default deployment tasks
+require 'capistrano/deploy'
+
+# Includes tasks from other gems included in your Gemfile
+#
+# For documentation on these, see for example:
+#
+#   https://github.com/capistrano/rvm
+#   https://github.com/capistrano/rbenv
+#   https://github.com/capistrano/chruby
+#   https://github.com/capistrano/bundler
+#   https://github.com/capistrano/rails
+#
+# require 'capistrano/rvm'
+# require 'capistrano/rbenv'
+# require 'capistrano/chruby'
+# require 'capistrano/bundler'
+# require 'capistrano/rails/assets'
+# require 'capistrano/rails/migrations'
+
+# Loads custom tasks from `lib/capistrano/tasks' if you have any defined.
+Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }

config/deploy.rb

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+# config valid only for Capistrano 3.1
+lock '3.2.1'
+
+set :application, 'my_app_name'
+set :repo_url, 'git@example.com:me/my_repo.git'
+
+# Default branch is :master
+# ask :branch, proc { `git rev-parse --abbrev-ref HEAD`.chomp }.call
+
+# Default deploy_to directory is /var/www/my_app
+# set :deploy_to, '/var/www/my_app'
+
+# 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
+
+# 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}
+
+# Default value for default_env is {}
+# set :default_env, { path: "/opt/ruby/bin:$PATH" }
+
+# Default value for keep_releases is 5
+# set :keep_releases, 5
+
+namespace :deploy do
+
+  desc 'Restart application'
+  task :restart do
+    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
+
+  after :restart, :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, 'cache:clear'
+      # end
+    end
+  end
+
+end

config/deploy/production.rb

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+# 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{deploy@example.com}
+role :web, %w{deploy@example.com}
+role :db,  %w{deploy@example.com}
+
+
+# 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 'example.com', user: 'deploy', roles: %w{web app}, 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)
+# ------------------------------------
+# server 'example.com',
+#   user: 'user_name',
+#   roles: %w{web app},
+#   ssh_options: {
+#     user: 'user_name', # overrides user setting above
+#     keys: %w(/home/user_name/.ssh/id_rsa),
+#     forward_agent: false,
+#     auth_methods: %w(publickey password)
+#     # password: 'please use keys'
+#   }

config/deploy/staging.rb

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+# 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{deploy@example.com}
+role :web, %w{deploy@example.com}
+role :db,  %w{deploy@example.com}
+
+
+# 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 'example.com', user: 'deploy', roles: %w{web app}, 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)
+# ------------------------------------
+# server 'example.com',
+#   user: 'user_name',
+#   roles: %w{web app},
+#   ssh_options: {
+#     user: 'user_name', # overrides user setting above
+#     keys: %w(/home/user_name/.ssh/id_rsa),
+#     forward_agent: false,
+#     auth_methods: %w(publickey password)
+#     # password: 'please use keys'
+#   }