capistrano + foreman deploy for RubyOnRails

.env.production

SECRET_KEY_BASE=ahsbdjhasbjhdabks # run rake:secret to generate
DATABASE_URL=postgres://user:pass@dbhost/database

Capfile

require 'capistrano/setup'

require 'capistrano/deploy'

require 'capistrano/rvm'
require 'capistrano/bundler'
require 'capistrano/rails/assets'
require 'capistrano/rails/migrations'
require 'capistrano/rails/console'
require 'capistrano/foreman'

Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }

deploy.rb

# config/deploy.rb
lock '3.4.0'

set :application, 'PROJECT_NAME'
set :repo_url, 'git@bitbucket.org:team/PROJECT_NAME.git'
set :deploy_to, "/opt/#{ fetch :application }"
set :linked_dirs, fetch(:linked_dirs, []).push(%w{ log tmp/pids tmp/cache tmp/sockets public/uploads })
set :linked_files, fetch(:linked_files, []).push('.env')

set :foreman_template, 'upstart'
set :foreman_export_path, "/etc/init"
set :foreman_options, {
  app: fetch(:application),
  root: current_path
}

namespace :deploy do
  task :restart do
    on roles(:app) do |host|
      f = "#{ fetch :foreman_export_path }/#{ fetch(:foreman_options)[:app] }.conf"
      if test("[ -f #{f} ]")
        invoke 'foreman:restart'
      else
        invoke 'foreman:setup'
      end
    end
  end

  desc "Upload .env.STAGE"
  task :upload_env do
    on roles(:all) do
      upload! ".env.#{ fetch :stage }", "#{ shared_path }/.env.#{ fetch :stage }"
    end
  end

  desc "Fix file permissions"
  task :fix_file_permissions do
    on roles(:app) do
      execute "chown -R #{ fetch :application } #{shared_path}/tmp"
      execute "chown -R #{ fetch :application } #{shared_path}/log"
      execute "chown -R #{ fetch :application } #{shared_path}/public/uploads"
    end
  end

  task :check_env do
    on roles(:all) do |host|
      f = "#{ shared_path }/.env"
      if test("[ -f #{f} ]")
        info "#{f} already exists on #{host}!"
      else
        execute "echo 'RACK_ENV=#{ fetch :stage }' > #{f}"
        execute "echo 'PATH=/usr/local/rvm/wrappers/ruby-2.2.1:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin' >> #{f}"
      end
    end

    on roles(:all) do |host|
      f = "#{ shared_path }/.env.#{ fetch :stage }"
      if test("[ -f #{f} ]")
        info "#{f} already exists on #{host}!"
      else
        invoke "deploy:upload_env"
      end
    end
  end

  before 'check:linked_files', :check_env
  after :publishing, :fix_file_permissions
  after :publishing, :restart

end

Gemfile

gem 'foreman'
gem 'dotenv-rails'

group :development do
  gem 'capistrano'
  gem 'capistrano-rvm'
  gem 'capistrano-bundler'
  gem 'capistrano-foreman'      # foreman support
  gem 'capistrano-rails'        # assets & migrations
  gem 'capistrano-rails-console' # provides rails:console task
end

NOTES

On server:
1. Create user with the name of project:

```
useradd PROJECT_NAME
```

2. Install rvm & ruby

```
gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
\curl -sSL https://get.rvm.io | bash -s stable --ruby=2.2.1
```

3. Install rails dependencies

```
apt-get install nodejs libpq-dev
```

4. Disable rails logging or setup logrotate to cleanup /opt/PROJECT_NAME/log/

production.rb

# config/deploy/production.rb
server 'SERVER_HOSTNAME', user: 'root', roles: %w{app db web}
set :linked_files, fetch(:linked_files, []).push('.env.production')