Unicorn的配置

unicorn.rb

# unicorn通过master进程管理worker进程，这里初始化工作进程的数量，默认为3个
# 举例： AWS EC2 m3.2xlarge 设置30个worker
worker_processes Integer(ENV["UNICORN_CONCURRENCY"] || 3)
preload_app      true
# 工作进程的响应超时时间（秒）
timeout          120
listen           "/tmp/sockets/unicorn.sock"
pid              "/tmp/pids/unicorn.pid"

if ENV['RAILS_ENV'] == 'development' # 开发环境用于测试和验证一些配置
  # 如果是开发环境，unicorn启动后可以通过8888端口访问
  listen 888
  working_directory "#{ENV['APP_PATH']}" # 指定working_directory，使得unicorn能够探查到应用文件的更新
else
  # 产品和测试环境使用不同的部署路径
  working_directory "#{ENV['APP_PATH']}/current"
  # 指定unicorn的日志路径
  stderr_path "/var/log/app-name/app-name-web-1.log"
  stdout_path "/var/log/app-name/app-name-web-1.log"
end

# 如果你的部署路径是symlink的，确保Unicorn使用正确的gem版本
before_exec do |server|
  ENV['BUNDLE_GEMFILE'] = "#{ENV['APP_PATH']}/current/Gemfile"
end

before_fork do |server, worker|
  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.connection.disconnect!
  # Graceful restart unicorn
  old_pid = "#{server.config[:pid]}.oldbin"
  if File.exists?(old_pid) && old_pid != server.pid
    # 如果新的master进程已经产生，旧的进程还存在就杀死旧的进程
    begin
      #sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
      Process.kill("QUIT", File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH
    end
  end

  sleep 1
end

after_fork do |server, worker|
  require 'analytics_ruby'

  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.establish_connection
    ActiveRecord::Base.verify_active_connections!

  # 在应用启动后初始化Segment.IO analytics
  prepare_analytics!
end