CentOS - Jun 2005 - Re: Reboots -- run-levels 2-5 vary wildly ...

From: Rodrigo Barbosa <rodrigob at
suespammers.org>
> rcS.d is not a runlevel. It is the equivalent of rc.sysinit on other
> distributions/flavors or, should I say, and expansion of that idea.
Correct, that's why I said "before" the run-levels at boot.  But
you
still need to know about it.
> 0 - Halt
> 1 - Single User
> 2 - Multi User (No NFS)
> 3 - Multi User 
> 4 - Reserved
> 5 - Multi User (Graphical, originaly XDM)
> 6 - Reboot
> The processes started at each runlevel will differ, of course.
> Not all machines will run httpd on run levels 2, 3 and 5. But
> none should run it at run levels 0, 1 or 6.
This are the Fedora-based distro run-levels.
Level 2-5 actually _differ_ on many UNIX/Linux platforms.
E.g., _many_ use 3 _not_ 5 for X11.

The only consistency seems to be 0, 1 and 6 -- although many
distros differ on a "maintanence" run-level between 0 and 1.



--
Bryan J. Smith   mailto:b.j.smith at ieee.org

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On Thu, Jun 02, 2005 at 01:36:18PM -0500, Bryan J. Smith <b.j.smith at
ieee.org> wrote:
> > 0 - Halt
> > 1 - Single User
> > 2 - Multi User (No NFS)
> > 3 - Multi User 
> > 4 - Reserved
> > 5 - Multi User (Graphical, originaly XDM)
> > 6 - Reboot
> > The processes started at each runlevel will differ, of course.
> > Not all machines will run httpd on run levels 2, 3 and 5. But
> > none should run it at run levels 0, 1 or 6.
> 
> This are the Fedora-based distro run-levels.
> Level 2-5 actually _differ_ on many UNIX/Linux platforms.
> E.g., _many_ use 3 _not_ 5 for X11.
There is nothing wrong with using X11 at runlevel 3. The only thing
that can't be present is a display manager (KDM, XDM, GDM etc). If
it is, it is wrong, and doesn't comply with the unix standard (don't
remember exactly which, but I studied it when working for Conectiva).
> The only consistency seems to be 0, 1 and 6 -- although many
> distros differ on a "maintanence" run-level between 0 and 1.
The standard is there. If a distro chooses not to follow it,
you can be very sure it will have acceptance problems.

When I have time later today (or tomorrow), I'll give out the
standard I'm mentoning and will give you a proper reference.
Sorry I can't provide it from the top of my head.

- -- 
Rodrigo Barbosa <rodrigob at suespammers.org>
"Quid quid Latine dictum sit, altum viditur"
"Be excellent to each other ..." - Bill & Ted (Wyld Stallyns)

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