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OS: Linux w PHP: 5.2.17 MySQL: 5.1.56 Time: 09:45 Members: 14089 Hits: 1789874 News: 281 WebLinks: 15

Recompile FreeBSD kernel

Contributed by Chad Brandt

Saturday, 19 June 2004

Sometimes there are security updates that force you to recompile the kernel, fortunately with FreeBSD this is very easy and quick to do.

1. If your kernel security level set you must turn this off in /etc/rc.conf and reboot

/etc/rc.conf
kern_securelevel_enable="NO"
#kern_securelevel_enable="YES"
#kern_securelevel="1"

2. Go to /usr/src/sys/i386/conf. This directory will hold your kernel configuration.

3. Configure the file you want to use for your kernel. eg. /usr/sbin/config GENERIC

4. The config command will place your configuration in /usr/src/sys/compile/<kernel config>. Now change to that directory eg. cd ../../compile/GENERIC

5. Now make the kernel eg. make depend && make && make install

Reboot your machine and make sure to turn the security level back on and change your rc.conf back again

Here is a small script I use to recompile my kernel

#!/bin/sh

cd /usr/src/sys/i386/conf
/usr/sbin/config GENERIC
cd ../../compile/GENERIC
make depend && make && make install

Comments

change this in your script
Written by Guest on 2005-08-09 18:54:29

on FreeBSD 5.4 i had to change this line:
cd ../../compile/GENERIC
to:
cd ../compile/GENERIC

and than use:
make depend && make && make install

Written by Guest on 2005-09-03 08:25:32

a faster way in atleast 5.x is after editing your kernel

cd /usr/src
make buildkernel KERNCONF= && make installkernel KERNCONF=

an example having copied the GENERIC to (prefered the hostname of the machine) WORKSTATION

cd /usr/src
make buildkernel KERNCONF=WORKSTATION && make installkernel KERNCONF=WORKSTATION

Written by tomse on 2005-09-03 08:34:08

a faster way in 5.x is after editing the kernel file,

cd /usr/src
make buildkernel KERNCONF= && make installkernel KERNCONF=

preferedly you make copy of the GENERIC file, for instance call it the same as the workstation name. Updates of the source might overwrite the GENERIC file and your changes will be lost.
as an example we'll call the copied kernel file WORKSTATION

cd /usr/src
make buildkernel KERNCONF=WORKSTATION && make installkernel KERNCONF=WORKSTATION

ref: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig-building.html

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