Date: Tue, 28 Aug 2012 14:12:10 -0700 From: Freddie Cash <fjwcash@gmail.com> To: Kevin Oberman <kob6558@gmail.com> Cc: Jamie Paul Griffin <jamie@kode5.net>, freebsd-stable@freebsd.org Subject: Re: Question About Tracking the Stable Branch Message-ID: <CAOjFWZ7HM2Z4FqPeoJ2c1qbX1DaygGGg5CLJh%2BytDs4wjBfVFg@mail.gmail.com> In-Reply-To: <CAN6yY1tKTu2mRaDo1WyNtvv7Sw5yFuTrru2QyGvD8jQg1oZ%2BPw@mail.gmail.com> References: <20120828203130.GB78051@kontrol.kode5.net> <CAN6yY1tKTu2mRaDo1WyNtvv7Sw5yFuTrru2QyGvD8jQg1oZ%2BPw@mail.gmail.com>
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On Tue, Aug 28, 2012 at 2:03 PM, Kevin Oberman <kob6558@gmail.com> wrote:
> In all cases, if you rebuild the kernel, be sure that the old kernel
> is saved to kernel.old so you can go back to it if there si a problem.
> 'make installkernel' does this) and, should you fix a problem and
> re-link the kernel, be sure NOT to overwrite the working kernel ('make
> reinstallkernel' does this.
It's not mentioned often on the lists, but KODIR and nextboot(8) are
wonderful things:
# make <whatever options> buildworld
# make KERNCONF=MYKERNEL <whatever other options> buildkernel
# make KERNCONF=MYKERNEL KODIR=/boot/MYKERNEL <whatever other
options> installkernel
# nextboot -k MYKERNEL
# shutdown -r now
That will install your new kernel into /boot/MYKERNEL, leaving
/boot/kernel alone. nextboot configures the boot process to use
/boot/MYKERNEL, again leaving /boot/kernel along. If anything goes
wrong, a simple reboot of the box returns you to using /boot/kernel as
before.
If the new kernel works correctly, then you can manually copy/moves
things around as needed:
# mv /boot/kernel /boot/kernel.old
# cp -Rvp /boot/MYKERNEL /boot/kernel
Especially useful when testing new kernels on remote systems, as "hit
the reset switch" on a locked up box puts things back to the way they
were before. No loader commands required. :)
--
Freddie Cash
fjwcash@gmail.com
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