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Home -> Community -> Usenet -> c.d.o.server -> Re: Setting Linux Kernel Parameters
Hello Howard,
the "clean way" is to consider your run-levels as another poster
mentioned.
Advantage: you have fine-grained control which scripts are executed.
eg run-levels on RH box (may vary if you use another distribution):
cat /etc/inittab
# # inittab This file describes how the INIT process should set up # the system in a certain run-level. # # Author: Miquel van Smoorenburg, <miquels_at_drinkel.nl.mugnet.org> # Modified for RHS Linux by Marc Ewing and Donnie Barnes # # Default runlevel. The runlevels used by RHS are: # 0 - halt (Do NOT set initdefault to this)# 1 - Single user mode
# 3 - Full multiuser mode # 4 - unused # 5 - X11 # 6 - reboot (Do NOT set initdefault to this) #
# System initialization.
si::sysinit:/etc/rc.d/rc.sysinit
l0:0:wait:/etc/rc.d/rc 0 l1:1:wait:/etc/rc.d/rc 1 l2:2:wait:/etc/rc.d/rc 2 l3:3:wait:/etc/rc.d/rc 3 l4:4:wait:/etc/rc.d/rc 4 l5:5:wait:/etc/rc.d/rc 5 l6:6:wait:/etc/rc.d/rc 6
Welcome to Linux!
Manuela Mueller
"Howard J. Rogers" wrote:
>
> Thank you!
>
> That alternative approach is ringing bells now. Here's what I did (and as
> far as I can tell, it's certainly doing the deed):
>
> cd /etc
> vi rc.config
> bung the lines
> cd /proc/sys/kernel
> echo blah blah blah > sem
> echo xxx > shmmax
> echo yyy > shmmni
>
> (these are the only parameters that needed changing)
>
> Save file, reboot, and the changed values are now visible every time I cat
> sem.
>
> Is there a problem doing things this way? You mentioned editing rc.local
> "for now"... why is doing it that way considered a short-term thing, since
> it seems to do the job perfectly well. I tried editing rc.local, but it
> didn't seem to work, whereas rc.config did. Anything wrong with doing it
> this way rather than that?
>
> Sorry for what are probably painfully obvious questions.
>
> Regards
> HJR
> --
> ------------------------------------------
> Resources for Oracle : www.hjrdba.com
> ============================
>
> "crappy" <crappygolucky_at_hotmail.com> wrote in message
> news:ce31c410.0203292257.25f51f8e_at_posting.google.com...
> > actually modifying those .h files is probably not such a great idea,
> > because doing it is so .. well, permament. also that will require you
> > re-compile the kernel, which is also something you mentioned:
> > generally something which, if you're not experienced with it, you
> > shouldn't try unless you're prepared to spend some time figuring out
> > what went wrong (you do learn a lot in the process tho).
> >
> > in fact, your initial approach is probably better: echo the params to
> > the proc "filesystem". those changes take effect immediately, but not
> > permamently as you said. now, .profile is something that happens on
> > each login (not precisely, but close enough) so that's not it: the
> > place you want to put it in is in a startup script, that is, /etc/rc.d
> > ... to do it "right" will require a little reading about run levels,
> > but you can always just put it in the rc.local ("for now").
> >
> >
> > "Howard J. Rogers" <dba_at_hjrdba.com> wrote in message
> news:<a837go$g83$1_at_lust.ihug.co.nz>...
> > > Lovely. That's really useful, so thank you.
> > >
> > > But it unfortunately doesn't tell me *how* to modify those parameters,
> which
> > > is what I actually needed to know. The structure of those files looks a
> bit
> > > tricky, and I don't want to bodge them up. It then also says 'if you
> modify
> > > them, rebuild the kernel', which again I'm sure is sound advice, but it
> > > doesn't say *how* to do that.
> > >
> > > If these aren't steps which are easily describable, then fair enough: if
> I
> > > have to get the Big Boys Book of Linux for Windows Users out of the
> library,
> > > I'll do it. I just thought maybe it wasn't that tricky... ?
> > >
> > > Regards
> > > HJR
> > > --
> > > ------------------------------------------
> > > Resources for Oracle : www.hjrdba.com
> > > ============================
> > >
> > >
> > >
> > > "Eve Hoellwarth" <hoellwarth-e_at_gmx.at> wrote in message
> > > news:v94aausclahcbd0nritk14o2cd1s7nhsst_at_4ax.com...
> > > > "Howard J. Rogers" wrote
> > > >
> > > > >Would anyone care to enlighten a poor Windows user on how to go about
> > > making
> > > > >the kernel parameter changes you need to make on a Linux box before
> > > > >installing Oracle a permanent fixture of the kernel?
> > > > >
> > > > >In other words, for installation, I do the following one-off
> exercise:
> > > > >
> > > > >cd /proc/sys/kernel
> > > > >
> > > > >echo 250 32000 100 128 > sem
> > > > >
> > > > >echo 33554432 > shmmax
> > > > >
> > > > >echo 4096 > shmmni
> > >
> > > > >And installation proceeds smoothly accordingly. But how to make the
> > > change
> > > > >permanent? In the deepest recesses of my brain, the words ".profile"
> are
> > > > >stirring into life, but not sure if that's really the way to do it
> (or
> > > whose
> > > > >profile to alter if so, so that the settings are made system-wide).
> > > >
> > > > Out from the linux install guide from technet.oracle.com
> > > >
> > >
> http://technet.oracle.com/docs/products/oracle8i/pdf/linux_installguide_817.
> > > pdf:
> > > >
> > > > Set the kernel parameters for shared memory in
> > > > /usr/src/linux/include/asm/shmparam.h and the semaphores in
> > > > /usr/src/linux/include/linux/sem.h
> > > >
> > > > In .profile you should set your oracle environment variables
> > > >
> > > > hth
> > > > Eve
> > > >
Received on Sat Mar 30 2002 - 07:19:15 CST
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