Capistrano 3 Sample for Deploying to Development

Capfile

require 'capistrano/setup'
require 'capistrano/deploy'
require 'capistrano/rvm'
require 'capistrano/bundler'
#require 'capistrano/rails/assets'
require 'capistrano/rails/migrations'
require 'capistrano3/unicorn'
require 'whenever/capistrano'

# Loads custom tasks from `lib/capistrano/tasks' if you have any defined.
Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }

deploy.rb

lock '3.4.0'

set :application, "jellyserver"
set :repo_url, "ssh://git@gitlab.dev.playnext.co.jp:10022/jelly/jellyserver.git"
set :branch, fetch(:stage)
set :deploy_to, "/u/apps/jellyserver"
set :keep_releases, 1

set :linked_files, [".env", "config/database.yml", "config/shards.yml", "config/sockets.yml"]
set :linked_dirs, ["log", "public", "tmp/pids", "tmp/sockets", "tmp/persistent"]

# SSH Config
set :default_env, {
  :LANG => 'en_US.UTF-8',
}

# Rails config
set :rails_env, fetch(:stage)
set :migration_role, :ctr
set :conditionally_migrate, true

# Bundler config
set :bundle_path, -> { shared_path.join("vendor", "bundle") }
set :bundle_binstubs, -> { shared_path.join("bin") }
set :bundle_without, (["development", "test", "production"] - [fetch(:stage).to_s]).join(" ")
set :bundle_flags, "--deployment"

# Unicorn config
set :unicorn_roles, [:ctr, :ap]
set :unicorn_pid, -> { shared_path.join("tmp", "pids", "unicorn.pid") }
set :unicorn_config_path, -> { current_path.join("config", "unicorn", "#{fetch(:stage).to_s}.rb") }

# Whenever config
set :whenever_roles, :ctr
set :whenever_environment, fetch(:stage).to_s
set :whenever_identifier, ->{ "#{fetch(:application)}_#{fetch(:stage)}" }

namespace :deploy do
  task :restart do
    invoke "unicorn:restart"
    on roles(fetch(:unicorn_roles)) do
      upload! StringIO.new(`git log -n10 --pretty=format:'%ci|%h|%an|%s|%d'`), "#{release_path}/log/recent_commits.log"
    end
  end
  after :publishing, :restart

  desc "remove active-admin"
  task :remove_active_admin do
    on roles(:ap) do
      within release_path do
        execute "rm -r #{release_path}/app/admin"
      end
    end
  end
  after :publishing, :remove_active_admin

  desc "Automatically create git tag #{fetch(:stage).to_s} and push to remote."
  task :add_tag do
    on roles(:ctr) do
      system [
        "git checkout --quiet #{fetch(:branch).to_s}",
        "git pull --quiet",
        "git tag --force deployed_#{fetch(:stage).to_s} #{fetch(:branch).to_s}",
        "git push --force origin deployed_#{fetch(:stage).to_s}"
      ].join(" && ")
    end
  end
  after :finished, :add_tag
end

maintenance.rb

namespace :maintenance do
  desc "Maintenance start (edit config/maintenance.yml to provide parameters)"
  task :start do
    on roles(:all) do
      upload! "config/maintenance.yml", "#{current_path}/tmp/maintenance.yml"
    end
  end

  desc "Maintenance stop"
  task :stop do
    on roles(:all) do
      execute "rm #{current_path}/tmp/maintenance.yml"
    end
  end
end

unicorn-development.rb

before_exec do |server|
  ENV['BUNDLE_GEMFILE'] = "/u/apps/<applicaton_name>/current/Gemfile"
end