Jonathan Horne wrote:
What if I want to use a kernel I compiled on one system, on another system?
What is the process to successfully migrate a kernel from one system to
another (or back to the same after a disaster recovery)?


Just FTP, NFS, or otherwise copy the kernel to the new system and reboot.

Now for the caveats. It is inadvisable to copy a kernel from one version of FreeBSD to another. You'll get mysterious library errors from libraries like libkvm. Copying 6.1 kernels to and from 6.1 systems is OK. Copying 6.1 kernels to 5.4 system is bad. Copying a kernel from last month's build of stable to this months build of stable is probably bad also.

I would advise you to install the kernel sources on each machine where you want to build a custom kernel. That or set up one machine to be your "build server" in the fashion described in the handbook.

You also have to take care regarding hardware compatibility. If one system is all SCSI and the other is all IDE you are not going to be able to move those kernels around and have properly functioning hard drives.

For disaster recovery, keep your kernel config file. I would argue that the config file is more important than the actual kernel binary.

Later,
Jason C. Wells
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