On Sat, 2002-05-25 at 15:15, rpjday wrote:
>
> a number of people i've chatted with lately seemed to think
> there was not much difference between run level 1 and run levels
> s or S. after i explained it a couple of times, it occurred to
> me to make sure *i* understood it properly.
>
> as i understand it, run level 1 is similar to the other numeric
> run levels in that all of those run levels are defined in
> /etc/inittab -- regardless of what numeric run level you're
> going to, init consults /etc/inittab to determine what has
> to happen, and this involves running the K and S scripts in
> the appropriate directory. for run level 1, this consists
> almost exclusively of K scripts (not totally, though -- more
> on that in a minute).
>
> in addition, if you boot to run level 1 at, say, the grub
> menu, /etc/inittab *must* exist since, obviously, it has to
> be consulted.
>
> run level S, though, is another matter, in that this takes
> the system directly to a single-user mode *without* consulting
> /etc/inittab -- useful if you've trashed that file.
Hmmm. Not sure that is true but the init man page does seem to have
some conflicting info.
>From the init man page:
BOOTING
After init is invoked as the last step of the kernel boot
sequence, it looks for the file /etc/inittab to see if
there is an entry of the type initdefault (see init
tab(5)). The initdefault entry determines the initial run
level of the system. If there is no such entry (or no
/etc/inittab at all), a runlevel must be entered at the
system console.
Runlevel S or s bring the system to single user mode and
do not require an /etc/initttab file. In single user
mode, a root shell is opened on /dev/console.
then later:
BOOTFLAGS
It is possible to pass a number of flags to init from the
boot monitor (eg. LILO). Init accepts the following flags:
-s, S, single
Single user mode boot. In this mode /etc/inittab is
examined and the bootup rc scripts are usually run
before the single user mode shell is started.
1-5 Runlevel to boot into.
Is the issue whether s is entered at boot or via telinit? Not sure but
like Mr Wagner, I have always assumed 1 and s were the same but clearly
they are not.
Keep us informed of any progress you make on figuring this out.
Bret
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