[CentOS] read only root file system

Fri May 2 13:43:05 UTC 2008
Brett Serkez <bserkez at gmail.com>

On Fri, May 2, 2008 at 9:38 AM, Ralph Angenendt <ra+centos at br-online.de> wrote:
> Brett Serkez wrote:
>  > On Fri, May 2, 2008 at 12:16 AM, Jason Pyeron <jpyeron at pdinc.us> wrote:
>  > > I am looking at having a read only box, it will not use a swap partition.
>  > >  Any recommendations?
>  >
>  > You'll need to break out your hard drive into multiple partitions, as
>  > there are certain portions of the file system that need to be writable
>  > such as /var and /home.  I setup systems in this manner to make them
>  > more difficult to subvert, I'd suggestion searching for topics such as
>  > "linux file system hardening".
>  What do you do with /etc/mtab - where the system clearly wants to write
>  into when you mount/unmount stuff?

Make it a soft-link to /var or other writable file system, perhaps
/etc/mtab -> /var/etc/mtab.

For the most part the Linux/UNIX file system is broken up into well
defined areas, but alas, exceptions need to be dealt with.