>If you have modified your kernel configuration, or if you have written a new one, you will want to test it before making it the default kernel for booting. Especially if you don’t have physical access to the console.
This is how you accomplish this:
For more information, check out:
- FreeBSD Handbook, section 8.3: Building and installing a custom kernel
- FreeBSD Handbook, section 8.5: If something goes wrong
- the /usr/src/UPDATING file (search for nextboot)
If it works, make the testkernel the default, and make the previous kernel the backup: