Sample Capistrano 3.1 Config

deploy.rb

# config valid only for Capistrano 3.1
lock '3.1.0'

set :application, '<application_name>'
set :repo_url, '<url.git>'
set :deploy_via, :remote_cache

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

# 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 public/assets}

# 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

# tasks used in all environments
load "config/deploy/tasks.rb"

staging.rb

server '<ip>', user: '<user>', roles: %w{app}
set :branch,    "<branch>"
set :deploy_to, "/var/ww/staging"
set :dbuser,    "<dbuser>"
set :dbpass,    "<dbpass>"
set :rails_env, 'staging'

tasks.rb

namespace :deploy do

  desc 'Restart application'
  task :restart do
    on roles(:app), in: :sequence, wait: 5 do
      execute "cd #{current_path} && touch tmp/restart.txt"
    end
  end
  
  desc 'Post process of deployment'
  task :post_process do
    on roles(:app), in: :sequence, wait: 5 do
      execute "cd #{current_path} && RAILS_ENV=#{fetch(:rails_env)} bundle install --deployment --without development test"
      execute "cd #{current_path} && RAILS_ENV=#{fetch(:rails_env)} bundle exec rake assets:clean"
      execute "cd #{current_path} && RAILS_ENV=#{fetch(:rails_env)} bundle exec rake assets:precompile"
      execute "cd #{current_path} && RAILS_ENV=#{fetch(:rails_env)} bundle exec rake db:create db:migrate"
    end
  end

  desc 'Seed'
  task :seed do
    on roles(:app), in: :sequence, wait: 5 do
      execute "cd #{current_path} && RAILS_ENV=#{fetch(:rails_env)} bundle exec rake db:seed"
    end
  end

  after :deploy, :post_process
  after :post_process, :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