使Ruby程序成为一个守护进程？

我想写一个Ruby程序，它总是在我的Mac上运行在后台（一个守护进程）。

有人能指出我如何做到这一点的正确方向？

Answer 1

使用Daemonize.rb

require 'daemons' Daemons.daemonize 

非常简单的样本： http ： //github.com/utkarsh2012/backitup/blob/master/backitup.rb

如何安装守护进程gem：

 gem install daemons 

Answer 2

Ruby 1.9.x现在有以​​下内容：

 Process.daemon 

把它放在你的代码中，就是这样。

摘自“ Ruby中的守护进程 ”。

Answer 3

啊，谷歌救援！ 查看

http://fitzgeraldsteele.wordpress.com/2009/05/04/launchd-example-start-web-server-at-boot-time/

其中一个有用的博主提供了编写一个launchd plist来启动一个ruby Web应用服务器的例子。

Answer 4

这是一个守护代码的模块 。 这是包装现有脚本的分支 。

从本质上讲，它归结为此（来自Travis Whitton的Daemonize.rb，上面的第一个链接，修改了我之前写的一些程序）：

 private # This method causes the current running process to become a daemon # If closefd is true, all existing file descriptors are closed def daemonize(pathStdErr, oldmode=0, closefd=false) srand # Split rand streams between spawning and daemonized process safefork and exit# Fork and exit from the parent # Detach from the controlling terminal unless sess_id = Process.setsid raise 'Cannot detach from controlled terminal' end # Prevent the possibility of acquiring a controlling terminal if oldmode.zero? trap 'SIGHUP', 'IGNORE' exit if pid = safefork end Dir.chdir "/" # Release old working directory File.umask 0000 # Insure sensible umask if closefd # Make sure all file descriptors are closed ObjectSpace.each_object(IO) do |io| unless [STDIN, STDOUT, STDERR].include?(io) io.close rescue nil end end end STDIN.reopen "/dev/null" # Free file descriptors and STDOUT.reopen "/dev/null" # point them somewhere sensible STDERR.reopen pathStdErr, "w" # STDOUT/STDERR should go to a logfile return oldmode ? sess_id : 0 # Return value is mostly irrelevant end # Try to fork if at all possible retrying every 5 sec if the # maximum process limit for the system has been reached def safefork tryagain = true while tryagain tryagain = false begin if pid = fork return pid end rescue Errno::EWOULDBLOCK sleep 5 tryagain = true end end end 

Answer 5

需要查看Rails 3的daemons-rails gem（基于rails_generator）：

https://github.com/mirasrael/daemons-rails

可以像这样生成守护进程存根：

 rails generate daemon  

特征：

• 每个守护进程的单独控制脚本
• rake：每个守护进程的守护进程命令
• 卡皮斯特拉诺友好
• 应用程序范围的控制脚本
• 监控API
• 可能的多个守护进程集