custom kernel, make buildkernel and then?

Garrett Cooper youshi10 at
Wed Oct 11 01:34:24 PDT 2006

Zbigniew Szalbot wrote:
> Hello,
> Hope you can advise me. I have a FreeBSD 6.1 stable system for which I 
> want to build a custom kernel. However, I am scared to death (almost 
> ;) and just want to make sure I have it done the right way.
> I have in the past used supfile with ports-all option and couldn't 
> build a custom kernel. Yesterday it dawned on me that I need sources 
> for that, not ports. So I ran cvsup with src-all option. Now, I 
> followed these steps:
> # cd /usr/src/sys/i386/conf
> # mkdir /root/kernels
> # cp GENERIC /root/kernels/LISTS
> # ln -s /root/kernels/LISTS
> then I used procedure 2 for building the kernel the new way.
> # cd /usr/src
> # make buildkernel KERNCONF=LISTS
> It all went well without any complaint (I was really puzzled - when it 
> comes to IT, I usually see half-empty glasses...) but now I wonder. My 
> next step is supposed to be make installkernel KERNCONF=LISTS
> Is it OK to do it on an already configured system? I have some usual 
> applications like php, mysql, apache, exim MTA configured and working. 
> So in other words I am trying to build a custom kernel not on a fresh 
> install but on an already working system (operating for 25 days). It 
> is not a webserver but it is running and needs these apps. My fear is 
> that I am likely to break something.
> Have I done the right steps? Do you think I can progress with make 
> installkernel?
> I have also a question about the last command in the recipe:
>> Now, shutdown the system and reboot to use your new kernel.
> Will shutdown -r now be enough? Or do I have to boot in single user mode?
> Sorry if all of these seems obvious. I am new to FreeBSD. Thank you 
> very much in advance!
> Warm regards,
> -- 
> Zbigniew Szalbot
Building and installing a new custom kernel? Usually the steps consist of:
1. Edit kernel config file.
2. If you have the symlink set correctly, or the file located in the 
right place, just run make buildkernel installkernel 
KERNCONF=[configfile name] (or if you feel slick, specify the name in 
/etc/make.conf and run make buildkernel installkernel).
3. Reboot.

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