Re: Setting Linux Kernel Parameters

Thanks Rick.

How bad is it from a thoroughbred Linux user's perspective if I just edit rc.config, and bung the lines 'cd /proc/sys/kernel' and 'echo 250 32000 128 100 > sem' right at the top?

'Cause that's what I did and a smooth install later, everything's running just fine.

But I suspect I've done the equivalent of genuflecting in Billy Graham's church and lighting 6 candles.

Regards
HJR

--
------------------------------------------
Resources for Oracle : www.hjrdba.com
============================



"Rick Wessman" <Rick.WessmanNO_SPAM_at_oracle.com> wrote in message
news:a8a8tn01uc6_at_drn.newsguy.com...


> In article <a84v0m$cln$1_at_lust.ihug.co.nz>, "Howard says...

> Hi, Howard:

>

> Here's how I did it on SuSE. I hope that it does not confuse you more. :-)

>

>                                            Rick

>

> 1. Create (or add to) a file called /etc/sysctl.conf with the following

> contents:

> kernel.sem = 250 32000 100 128

> kernel.shmmax = 2147483648

> kernel.shmmni = 100

>

> (These are mine - Yours will be different, probably)

>

>

> 2. Create a script in /etc/rc.d called "oracle" (the name is not

> important). It runs sysctl which does the kernel parameter modification.

> Here are the contents:

>

> #!/bin/sh

> # Oracle Kernel Configuration Parameters

> # Startup script run to configure kernel

> sysctl -p

>

> 3. Create links to this file in /etc/rc3.d and /etc/rc5.d

> cd /etc/rc3.d

> ln -s ../oracle S23oracle

> cd /etc/rc5.d

> ln -s ../oracle S23oracle

>

> 4. Reboot the machine.

>

> 5. Since you probably go to state 5 (GUI), this will work fine. I

occasionally


> go to state 3, so I put in a symbolic link for that state as well.

>

>

>

> >

> >Lord!

> >

> >All I have to do on Windows is click 'Install'!

> >

> >I did actually manage this last year, before the NT version of 9i was

out,


> >and it worked.  Did I keep my notes?  No.  Am I stupid?

> >

> >(Don't answer that!)

> >

> >Thanks for this -though I have to tell you, I managed to make more sense

of


> >the hieroglyphs at Luxor.

> >

> >;-o

> >

> >HJR

> >--

> >------------------------------------------

> >Resources for Oracle : www.hjrdba.com

> >============================

> >

> >"samy atoui" <s.atoui_at_bigfoot.com> wrote in message

> >news:3CA5BB53.F56001AC_at_bigfoot.com...

> >> 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

> >> #   2 - Multiuser, without NFS (The same as 3, if you do not have

> >> networking)

> >> #   3 - Full multiuser mode

> >> #   4 - unused

> >> #   5 - X11

> >> #   6 - reboot (Do NOT set initdefault to this)

> >> #

> >> id:3:initdefault:

> >>

> >> # 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

> >> <snip>

> >>

> >> 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 50 320020 100 128 > sem

> >> > > > > >

> >> > > > > >echo 3355443c2 > 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

> >> > > > >

> >

> >

>

>                                 Rick Wessman

>                                 Oracle Corporation

>

>      The opinions expressed above are mine and do not necessarily reflect

>                          those of Oracle Corporation.

>