ruby – 当Unicorn主机完成重启时是否可以发送通知？

第一步是添加一个API,返回部署的当前代码版本的git SHA.例如,您部署AAAA.现在您部署BBBB并将返回.例如,假设您添加了返回SHA的api“/ checks / version”.

这是一个用于实现此API的示例Rails控制器.它假设存在capistrano REVISION文件,并在app加载时将当前版本SHA读入内存：

class ChecksController
  VERSION = File.read(File.join(Rails.root,'REVISION')) rescue 'UNKNOWN'

  def version
    render(:text => VERSION)
  end
end

然后,您可以通过API轮询本地独角兽以获取SHA,并等待它更改为新版本.

以下是使用Capistrano的示例,它将正在运行的应用版本SHA与新部署的应用版本SHA进行比较：

namespace :deploy do
  desc "Compare running app version to deployed app version"
  task :check_release_version,:roles => :app,:except => { :no_release => true } do
    timeout_at = Time.now + 60
    while( Time.now < timeout_at) do
      expected_version = capture("cat /data/server/current/REVISION")
      running_version = capture("curl -f http://localhost:8080/checks/version; exit 0")

      if expected_version.strip == running_version.strip
        puts "deploy:check_release_version: OK"
        break
      else
        puts "=[WARNING]==========================================================="
        puts "= Stale Code Version"
        puts "=[Expected]=========================================================="
        puts expected_version
        puts "=[Running]==========================================================="
        puts running_version
        puts "====================================================================="
        Kernel.sleep(10)
      end
    end
  end
end

您需要调整轮询的超时/重试次数以匹配平均应用启动时间.此示例假定为capistrano结构,其中app为/ data / server / current,端口为8080的本地独角兽.