Olivier Berger <olivier.ber...@telecom-sudparis.eu> writes:

> I had the impression that the "recovery mode" default grub entry was
> meant for booting with read-only, but can't manage to spot
> documentation.

Historically, I'm pretty sure it's just a way to boot single-user, often
without spawning getty and so forth and instead using a simpler root
password verification mechanism.  Linux traditionally brings up more
services in single user than, say, Solaris (such as networking), but I
think even Solaris didn't keep the root partition read-only when booting
single-user.

-- 
Russ Allbery (r...@debian.org)               <http://www.eyrie.org/~eagle/>


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