个回答

• henry123456

  2015-12-18 18:49:47

  Ubuntu的默认开机的runlevel是2,可以用runlevel来查看当前的默认运行级别。
  debian系(ubuntu是基于debian)的Linux一直是用runlevel 2来默认启动，并且runlevel定义也与redhat有区别。
  debian的runlevel级别定义如下：
  0 - Halt
  1 - Single
  2 - Full multi-user with display manager (GUI)
  3 - Full multi-user with display manager (GUI)
  4 - Full multi-user with display manager (GUI)
  5 - Full multi-user with display manager (GUI)
  6 - Reboot
  可以发现2~5级是没有任何区别的。
  而redhat的runlevel级别定义如下：
  0 - Halt
  1 - Single
  2 - Not used/User definable
  3 - Full multi-user NO display manager
  4 - Not used/User definable
  5 - Full multi-user with display manager (GUI)
  6 - Reboot

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