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FreeBSD - Custom Kernel

Our previous FreeBSD installation may lack of options like ALTQ for PF (Packet Filter). So we have to compile our kernel to a new kernel with some option enable. Prepare yourself..

• Make sure you are on i386 architecture machine
• Copy the original GENERIC kernel to a new one.
• Bare in mind, you are not allowed to make any changes to the original kernel. Since we will use that for our 'work in hand' kernel if anything goes wrong.

shell>cd /usr/src/sys/i386/conf
shell>cp GENERIC MYKERNEL

• Edit MYKERNEL using your prefered editor. Mine prefer nano :)

shell>nano MYKERNEL

• For this tutorial we will enable ALTQ for PF

#options for pf (packet filter) ALTQ
options ALTQ
options ALTQ_CBQ
options ALTQ_RED
options ALTQ_RIO
options ALTQ_HFSC
options ALTQ_PRIQ
options ALTQ_NOPCC

#pf (packet filter)
device pf
device pflog
device pfsync


• Save and let's build them up!

shell> cd /usr/src
shell>make buildkernel KERNCONF=MYKERNEL

• Install the new kernel

shell>make installkernel KERNCONF=MYKERNEL

• When finished, the output will look like this :

--------------------------------------------------------------
>>> Kernel build for MYKERNEL completed on Tue Dec 29 20:18:53 MYT 2009
--------------------------------------------------------------

• Reboot your machine and make sure you are using the custom kernel

shell>uname -a
FreeBSD web.domain.com 7.2-RELEASE-p5 FreeBSD 7.2-RELEASE-p5 #0: Tue Dec 29 20:10:31 MYT 2009 root@web.domain.com:/usr/obj/usr/src/sys/MYKERNEL i386
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