Ruby on rails 4 使用capistrano 3在生产上运行rpush

为了运行Rpush，我在config/deploy.rb中编写了这篇文章

 after :publishing, 'deploy:restart'

  after :finishing, 'deploy:cleanup'

  after :finished, :restart_rpush do

    on roles(:web) do
        within release_path do
            with rails_env: fetch(:rails_env) do
                execute :bundle, :exec, "rpush stop -e #{fetch(:rails_env)}"
                execute :bundle, :exec, "rpush start -e #{fetch(:rails_env)}"
            end
        end
    end
  end
end

部署时，我遇到以下错误：

DEBUG [76ef4791]    * Rpush isn't running? 
/home/dev/proteqtor/releases/20150714065629/tmp/rpush.pid does not exist.

---

Rpush未运行。这个问题的原因可能是什么？

我认为这是因为，由于Rpush没有运行，所以您得到了一个未捕获的异常，

execute:bundle，：exec，“Rpush stop-e#{fetch（：rails_env）}”

。也就是说，如果没有运行，为什么要运行

rpush stop

相反，首先测试（使用Capistrano 3）pid文件是否存在于给定路径，如果存在，则仅运行stop，否则仅运行start：

desc 'Restart rpush'
task :restart_rpush do
  on roles(:web) do
    within release_path do
      with rails_env: fetch(:rails_env) do
        if test('[ -f /path/to/my/pid/file ]')
          # Rpush is running
          execute :bundle, :exec, "rpush stop -e #{fetch(:rails_env)}"
          execute :bundle, :exec, "rpush start -e #{fetch(:rails_env)}"
        else
          # Rpush is not running
          execute :bundle, :exec, "rpush start -e #{fetch(:rails_env)}"
        end
      end
    end
  end
end

after :finished, :restart_rpush