在Capistrano任务中启动后台进程 [英] launching background process in capistrano task

问题描述

capistrano任务

capistrano task

namespace :service do
  desc "start daemontools (svscan/supervise/svscanboot)"
  task :start, :roles => :app do
    sudo "svscanboot&"
  end
end

现在这不起作用:svscanboot进程根本无法运行. 这帮助我找到了sleep: https://github.com/defunkt/resque/issues/284 其他来源指出我是nohup，redirection和pty => true，所以我尝试了所有这些.

Now this doesn't work: the svscanboot process simply doesn't run. This helped me find sleep: https://github.com/defunkt/resque/issues/284 other sources pointed me to nohup, redirection, and pty => true, so I tried all these.

run "nohup svscanboot >/tmp/svscanboot.log 2>&1 &"   # NO
run "(svscanboot&) && sleep 1"                       # NO
run "(nohup svscanboot&) && sleep 1"                 # YES!

现在，有人可以向我解释为什么我需要睡眠声明，而nohup有何不同? 从记录来看，如果从用户外壳程序运行，以上所有功能同样运行良好，问题仅在于capistrano.

Now, could anyone explain to me why i need the sleep statement and what difference does nohup make? For the record all the above run equally well if run from user shell, problem is only in the context of capistrano.

谢谢

推荐答案

我的简单解决方案是使用要运行的任何代码在远程服务器上创建svscanboot.sh文件.就您而言

My simple solution would be make svscanboot.sh file at remote server with whatever code you want to run. In your case

svscanboot >/tmp/svscanboot.log 2>&1

在上限耙任务中添加此

run "sh +x somefile.sh &"

这对我来说很好.

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