generate new kernel - kmupdate: automatic reboot?

[Carsten Cimander_2]

Hi all,

I had to increase some static kernel parameters.
I did "manually" following this procedure:

# cp /stand/system /stand/system.$DATE
# cd /stand/build
# /usr/lbin/sysadm/system_prep -s /stand/build/system
# kmtune -s = -S /stand/build/system

# /usr/sbin/mk_kernel -s ./system"
# mv /stand/system /stand/system.prev"
# mv /stand/vmunix /stand/vmunix.prev"
# mv /stand/dlkm /stand/dlkm.vmunix.prev"
# mv /stand/build/system /stand/system"

Now I want to process the command:
# kmupdate /stand/build/vmunix_test"

Question:
What happens if I do this? Will the system reboot
automatically?
If so: what can I do instead to place the new
kernel /stand/build/vmnix_test to /stand/vmunix
and also the dynamic modules /stand/build/dlkm.vmunix_test to /stand/dlkm ?

Thank you for your tipps in advance

Cheers
Carste

[Steven E. Protter]

When you do this at the command line, it will not automatically reboot your system.

You will have to do this:

cd /
shutdown -ry now

P

[Marco Santerre]

Hi Carsten,

No the kmupdate doesn't automatically reboot your server. You have to issue the
#shutdown -ry 0
in order to reboot your system.

All that is going to happen is that it's going to put in place the new kernel so that when you boot it'll use this vmunix instead. If your reboot has problem with your new vmunix, you can then reboot using vmunix.prev

[Dietmar Konermann · Accepted solution]

Hi, Carsten!

The kmupdate will NOT reboot automatically. During the next shutdown the /sbin/init.d/kmbuild script will move the kernel into place.

BTW, if you don't shutdown, but reboot/reset, then kmbuild will detect the kernel update during startup, move the kernel and reboot a 2nd time.

This is what I do usually to tune the kernel, if I want to be fast. :-)

# kmtune ...
# mk_kernel
# kmupdate
# /sbin/init.d/kmbuild stop
# reboot

Best regards...
Dietmar.

[Carsten Cimander_2]

Hi Dietmar, Marco and Steven,

thanks for the facts.
Now I can safely update
the systems without fearing
that project-/application-
users will flame me :-)


Dietmar - what shall I say -
as usual: many thanks for
your advanced and special
tips. :-))

CU
Carsten