I think we figured all of this out already. Runlevel 1 is a defined runlevel (/etc/inittab) who's behavior is based on the related rc.d scripts (Runlevel 1 could therefore spam the screen with ascii art and do nothing more).
Runlevel S, obviously, is what one would use if you were just going to get things going (good if you're building a system from scratch... or doing a major rebuild of a b0rked setup). Runlevel 1 would seem to be accessible via init/telinit (since traditionally, runlevel 1 means that none of the network stuff is going among other things), whereas Runlevel S would logically be best (if not only) accessible by rebooting. On Sat, 25 May 2002, Bret Hughes wrote: > 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 > > > > _______________________________________________ > Redhat-list mailing list > [EMAIL PROTECTED] > https://listman.redhat.com/mailman/listinfo/redhat-list > -- _______________________________________________ Redhat-list mailing list [EMAIL PROTECTED] https://listman.redhat.com/mailman/listinfo/redhat-list
