How customized can an mfsroot be?

[Tim Judd]

On 4/5/10, Peter Steele <psteele at maxiscale.com> wrote:
>> But ... why are you constricting yourself to use mfs_root?  I have many
>> times ran FreeBSD completely from CDrom, which
>>will give you all 700 (or a DVD, 4.3G) usable space.
>>
>>I'd be happy to help, if you have questions.  but please direct the
>> questions to the mailing list.
>
> The reason I was doing it this way was because I didn't know how to provide
> the CD-ROM environment a writeable file system for /tmp and /var. Obviously
> these have to be setup as some kind of ram based file system. What's the
> trick?
>
>


If FreeBSD cannot write to /tmp or /var on boot, it automatically
creates a MFS filesystems for those mountpoints and mounts them during
boot.  You don't need to do anything.

It works as the same readonly compactflash environments out there.