Rake SSH deployment

rake_ssh_deploy.md

Rake SSH deployment

Usage

Set up deployment folder

bundle exec rake deploy:setup

Update code and restart server

bundle exec rake deploy

Update code

bundle exec rake deploy:update_code

Restart server

bundle exec rake deploy:restart_server

Notes

Assuming you'll use rbenv on remote server. Change path to gem executable files if you'll use something else.

Sourcing ~/.profile on remote machine before command execution to load environment variables. Check StackOverflow question to understand why to do it this way (there should be a better approach).

rake_ssh_deploy.rake

desc 'Deploy and restart server'
task deploy: [
  'deploy:update_code',
  'deploy:restart'
]

namespace :deploy do
  @user = 'username'
  @host = 'www.example.com'
  @repository = 'git@github.com:owner/repository.git'
  @branch = 'origin/master'
  @deployment_path = '/path/to/directory'

  desc 'Setup folder'
  task :setup do
    remote_task(create_folder_if_not_exists)
  end

  desc 'Update code'
  task :update_code do
    remote_task([
      update_code_command,
      bundle_install_command
    ])
  end

  desc 'Restart server'
  task :restart do
    remote_task(restart_server_command)
  end

  def remote_task(commands, options = {})
    commands = Array(commands)
    commands.each do |command|
      sh "ssh #{@user}@#{@host} \"#{source_profile} && #{change_dir} && #{command}\""
    end
  end

  def source_profile
    "source /home/#{@user}/.profile"
  end

  def change_dir
    "cd #{@deployment_path}"
  end

  def create_folder_if_not_exists
    "mkdir -p #{@deployment_path}"
  end

  def update_code_command
    [
      "git fetch origin",
      "git reset --hard #{@branch}"
    ].join(" && ")
  end

  def bundle_install_command
    "/home/#{@user}/.rbenv/shims/bundle install --without development test"
  end

  def restart_server_command
    [
      "/home/#{@user}/.rbenv/shims/bundle exec rake app:kill",
      "/home/#{@user}/.rbenv/shims/bundle exec rackup -D"
    ].join(" && ")
  end
end

namespace :app do
  desc "Kill rackup daemon" # Taken from StackOverflow (http://stackoverflow.com/a/10747618/1291371)
  task :kill do
    pid_file = File.expand_path('../tmp/pids/rackup.pid', __FILE__)

    if File.exist?(pid_file)
      pid = File.read(pid_file).to_i
      Process.kill 9, pid
      File.delete pid_file
    end
  end
end