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Re: Which directorys should be read only vs. writable.

On Sun, 8 Mar 1998, Bernd Eckenfels wrote:

> > > > > Which directorys could be set up read only and which have to be writable?
> /usr is Read-Only, and /var is RW. /usr/spool and /usr/tmp are obsolete on
> Debian Systems and are relaced by /var/spool and /var/tmp.
> > The root directory.  It needs to be writable since /dev must be
> > writable.  /dev cannot be on a separate partition since files from
> > /dev are required when booting the system.
> Running MAKEDEV on boot-up is not required on a stripped-down Firewall host.
> Therefore the only Modifications in /dev at runtime are "chown" of the TTYs
> and A-Time for all accessed devices. A-Time will not be done on read-only
> media, and the cown for TTYs is not needed on a system where u dont have
> interactiv Users logged in.

Another problem is syslog which create /dev/log at boot.

> Another Option is to have a minimized /dev for booting and overwrite it with
> a Ramdisk or a Loopback Filesystem which suppors all Devices which are
> needed after the boot is finished.

I agree that this would work but it seems too complicated.  It would
seem better to clean up the filesystem and application so that they
don't write into /dev at all even during boot.

Jean Pierre

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