How to clean up /

[Fleuriot Damien]

On Nov 30, 2012, at 9:59 AM, Alfred Bartsch <bartsch at dssgmbh.de> wrote:

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> Am 30.11.2012 08:16, schrieb Kevin Oberman:
>> On Thu, Nov 29, 2012 at 8:46 PM, Daniel O'Connor
>> <doconnor at gsoft.com.au> wrote:
>>> 
>>> On 30/11/2012, at 12:14, mbsd <mbsd at isgroup.com.ua> wrote:
>>>> Ξ ~ → du -sh /boot/kernel 59M   kernel
>>>> 
>>>> Try to recompile your kernel without debug.
>>> 
>>> Or delete /boot/kernel/*.symbols.
> 
> You may suppress the installation of the *.symbols files by inserting
> the following statement into /etc/make.conf:
> 
> # prevent installation of "*.symbols" in /boot/kernel
> INSTALL_NODEBUG=        yes


In addition to the previous advice you've received regarding symbol files, you may also want to only compile and install the kernel modules you actually use.
There's also the side benefit of the kernel being that much faster to rebuild.

Get the list with "kldstat".

Here for example, we only build a very few of them:
$ kldstat
Id Refs Address            Size     Name
 1   19 0xffffffff80100000 b0eec0   kernel
 2    1 0xffffffff80c0f000 bca8     geom_label.ko
 3    1 0xffffffff80c1b000 1350     mfi_linux.ko
 4    4 0xffffffff80c1d000 47958    linux.ko
 5    1 0xffffffff80e12000 40c3     linprocfs.ko
 6    1 0xffffffff80e17000 a14      linsysfs.ko


This yields a very lightweight kernel folder, even when retaining the debug symbols:
$ du -hs
 46M	.

This is what you want in /etc/rc.conf :
MODULES_OVERRIDE=geom/geom_label if_lagg if_vlan linprocfs linsysfs linux mfi/mfi_linux