Home / ubuntu / Questions / 505903
Accepted
Yishu Fang
Asked: 2014-08-03 06:54:26 +0800 CST

When will "runlevel" event be emitted?

  • 772
start on runlevel [2345]

referring this:

The syntax of start on stanza is:

start on EVENT [[KEY=]VALUE]... [and|or...]

It means, runlevel is en event, [2345] is that event's environment variables' value.

My question is

  • when will runlevel event be emitted?
  • Where can I dig more information about runlevel event?
upstart

1 Answers

  1. Best Answer

    From the Upstart cookbook (steps 9-11):

    Since the start on condition for the rc-sysinit job is:

    start on filesystem and net-device-up IFACE=lo

    Upstart will then start the rc-sysinit job.

    The rc-sysinit job calls the telinitcommand, passing it the runlevel to move to:

    telinit 2

    The telinit command emits the runlevel(7)event as:

    runlevel RUNLEVEL=2 PREVLEVEL=N

    So, the runlevel is emitted once the filesystems are mounted and the loopback device is up.

    To dig up more information, read the Upstart cookbook (completely, not bits and pieces).

    • 1