Too Slow To Stop
Rick Stevens
rstevens at internap.com
Wed Aug 8 00:32:05 UTC 2007
On Tue, 2007-08-07 at 17:22 -0700, Rick Stevens wrote:
> On Tue, 2007-08-07 at 17:39 -0400, Mike - EMAIL IGNORED wrote:
> > On Tue, 07 Aug 2007 16:27:20 -0500, Mikkel L. Ellertson wrote:
> > [...]
> >
> > >
> > > For example, random.init has these three lines:
> > > # chkconfig: 2345 20 80
> > > # description: Saves and restores system entropy pool for \
> > > # higher quality random number generation.
> > > This says that the random script should be started in levels
> > > 2, 3, 4, and 5, that its start priority should be 20, and
> > > that its stop priority should be 80. You should be able to
> > > figure out what the description says; the \ causes the line
> > > to be continued. The extra space in front of the line is
> > > ignored.
> > >
> > > Mikkel
> > [...]
> >
> > Yes, but what about my original problem? How can a process
> > tell when the system has begun to shut down down?
> >
> > BTW, in looking around, I found:
> >
> > [root at mbrc32]# runlevel
> > N 3
> >
> > Now this surprises me; it was run from a KDE Shell Konsole.
> > While I start my system at level 3, I then type startx.
> > I thought that the GUI runs at level 5. Am I wrong about
> > this?
>
> Yes. Well, sort of. If you start the machine at run level 5, the
> inittab fires off X. However, you can start X at any run level. It
> may be that some of the stuff needed to support X aren't running at
> a lower level, on Fedora everything you need is running at level 3.
> Since your machine booted to run level 3, that's what it's running at.
> You ran X as an application.
>
> For the most part, run levels are really advisory. They allow you to
> group different things to different levels of functionality.
> Historically, run level 1 was "maintenance" mode and only the minimum
> stuff needed to run was used...on some machines, only the root
> filesystem was even mounted.
>
> Level 2 was "multiuser" mode--run level 1 with other _local_ filesystems
> mounted and multiple consoles. Level 3 was "multiuser mode"--run level
> 2 with network enabled, inetd/xinetd started as well to allow telnet,
> rlogin, rsh and ftp access, and NFS shares mounted. Level 4 was
> user-defined and level 5 was GUI. Level 6 is a restart or reboot.
Sorry, I meant to say level 3 was "network, multiuser" mode. My bad.
(gotta start proofreading before I hit SEND :-( )
> None of this stuff is necessarily cast in concrete. You can play with
> the inittab and the stuff in the /etc/rc.d/rcX.d directories to your
> heart's content. Just make sure you keep a virgin copy of everything
> you mess with in case you do something...uh...silly. :-)
>
> ----------------------------------------------------------------------
> - Rick Stevens, Principal Engineer rstevens at internap.com -
> - CDN Systems, Internap, Inc. http://www.internap.com -
> - -
> - To err is human, to moo bovine. -
> ----------------------------------------------------------------------
>
----------------------------------------------------------------------
- Rick Stevens, Principal Engineer rstevens at internap.com -
- CDN Systems, Internap, Inc. http://www.internap.com -
- -
- Hard work has a future payoff. Laziness pays off now. -
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