Re: Setting Linux Kernel Parameters

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

> > >