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How to Recompile the FreeBSD Kernel

The below example is for SMP, Quotas, and Firewall support.

Sources must be installed to recompile the kernel. If sources are not on the server type:

/stand/sysinstall and go to configure>Package>Sources.

cd /usr/src/sys/i386/conf

cp GENERIC SMP

edit the SMP file and add the following under the options section:

#Added options for SMP kernel

options SMP

options QUOTA

options IPFIREWALL
#Enables Firewall

options IPFIREWALL_VERBOSE
#Enables firewall logging to syslog

options IPFIREWALL_VERBOSE_LIMIT=10
#Limits logging to prevent syslog DOS options

IPFIREWALL_DEFAULT_TO_ACCEPT
#Defaults to all open

Save the file

At this point there are 2 way to proceed in compiling the kernel: the old way and the new way. First, we’ll show you the old way.

 

Old way:

/usr/sbin/config SMP

cd ../compile/SMP

make depend

make

make install

Reboot to load the new kernel

 

New Way:

cd /usr/src

make buildkernel KERNCONF=SMP

make installkernel KERNCONF=SMP

Reboot to load the new kernel

 

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