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FreeBSD: reverting to previous kernel

Hi all,

I built a custom kernel on my FreeBSD 8.2-RELEASE server and it failed to boot. I'd like to revert to the previous kernel.

I see the following directories in /boot:

Code:

kernel

kernel.OK

kernel.old

kernel.old1

If I simply copy kernel.OK to kernel will this be sufficient?

For the sake of clarity: I have figured out how to reboot the old kernel; now I would like to make the reversion permanent.

Thanks.

It should, assuming kernel.old is the previous one. Check this out for a bit more details:
http://www.freebsd.org/doc/en_US.ISO...g-trouble.html
not much help now :), but in the future I would save the kernel originally installed under a name you know means something to you.

Regards
John

Thanks. I actually checked the Handbook before posting here, but missed that bit.

Perhaps you will know the answer to a relate question. The kernel config file I was using didn't boot, so I went back to GENERIC. The modules igb and bce returned compile errors, so I commented them out. However, I don't know what module failed here:

Code:

/usr/src/sys/modules/netgraph/atm/uni/../../../../contrib/ngatm/netnatm/sig/sig_party.c: In function 'uni_sig_party':

/usr/src/sys/modules/netgraph/atm/uni/../../../../contrib/ngatm/netnatm/sig/sig_party.c:916: internal compiler error: in symbol_marked_for_renaming, at tree-into-ssa.c:548

Please submit a full bug report,

with preprocessed source if appropriate.

See <URL:http://gcc.gnu.org/bugs.html> for instructions.

*** Error code 1



Stop in /usr/src/sys/modules/netgraph/atm/uni.

*** Error code 1



Stop in /usr/src/sys/modules/netgraph/atm.

*** Error code 1



Stop in /usr/src/sys/modules/netgraph.

*** Error code 1



Stop in /usr/src/sys/modules.

*** Error code 1

I can't find either "netnatm", "netgraph", "atm", or "ngatmin" in GENERIC. Any ideas?

Quote:

Originally Posted by Kropotkin (Post 4789190)

Hi all,

I built a custom kernel on my FreeBSD 8.2-RELEASE server and it failed to boot. I'd like to revert to the previous kernel.

Everytime You want to try a new kernel just type nextboot -k NEWKERNEL. This way if it does not boot, You system will boot the old working kernel on the next boot.

Quote:

Originally Posted by Kropotkin (Post 4789190)

I see the following directories in /boot:

Code:

kernel

kernel.OK

kernel.old

kernel.old1

If I simply copy kernel.OK to kernel will this be sufficient?

For the sake of clarity: I have figured out how to reboot the old kernel; now I would like to make the reversion permanent.

This would do:

Code:

cd /boot

mv kernel faulty

mv kernel.OK kernel

Also when building new kernel do it like that:

Code:

# make buildworld kernel KODIR=/boot/NEWONE

This way You will not 'mess' the old one to /boot/kernel.old directory.

... about Your conpilation error, try with this one:

Code:

# make buildworld kernel KODIR=/boot/NEWONE

Sometimes make buildworld is mandatory for make kernel | make buildkernel steps.

Quote:

Originally Posted by Kropotkin (Post 4789459)

I can't find either "netnatm", "netgraph", "atm", or "ngatmin" in GENERIC. Any ideas?

Sure you are on GENERIC (uname -a) ? Maybe check /boot/loader.conf and /etc/rc.conf, try to comment out similar entries and see if that helps.

John