Basic capistrano 3 deploy

Capfile.rb

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

config_deploy.rb

set :application, "myapp"

set :repo_url,    "[email protected]:me/myapp.git"

set :user,       "deploy"
set :deploy_to,  "/home/deploy/myapp"
# set :deploy_via, :copy
set :deploy_via, :remote_cache

set :format, :pretty
set :log_level, :info
set :keep_releases, 5

set :ssh_options, {
  # verbose: :debug,
  user: fetch(:user),
  forward_agent: true
}

set :linked_files, %w{config/database.yml config/.env}
set :linked_dirs,  %w{bin log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system}

namespace :deploy do

  desc 'Restart application'
  task :restart do
    on roles(:all), in: :sequence, wait: 5 do
      execute :touch, release_path.join('tmp/restart.txt')
    end
  end

  after :restart, :clear_cache do
    on roles(:all), 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

  # desc "Add index to public"
  # task :symlink_index do
    # on roles(:app) do
      # run "ln -nfs #{shared_path}/index.html #{release_path}/public/index.html"
    # end
  # end

  after :finishing, 'deploy:cleanup'
end

config_deploy_production.rb

server "myserver", roles: %w{app web db}
set :branch,    'master'
set :stage,     :production
set :rails_env, "production"

Gemfile.rb

gem 'capistrano', '~> 3.0.0', require: false
gem 'capistrano-rails'
gem 'capistrano-bundler'
gem 'capistrano-rvm'