[libvirt-users] read-only rootfs for lxc containers

[Daniel P. Berrange]

On Thu, Dec 08, 2011 at 07:47:28AM -0800, Chris Haumesser wrote:
> Daniel P. Berrange wrote:
> > Hmm, so your actual filesystem on the host side is read only ?
> 
> Yup, mounting a squashfs in RAM.
> 
> > I'll have to think about how to make it work when the host
> > FS itself is readonly. Probably have to define some location
> > that is guarenteed to exist, instead of trying to create a
> > '/.oldroot' location ourselves.
> 
> 
> I suppose so, yes. What is the purpose of .oldroot? When I switch to a
> rw filesystem, I see that .oldroot gets created, but it is just an empty
> directory.

It is used as an intermediate temporary location when we pivot from
one root filesystem to another, so you shouldn't expect to see anything
there. We just need a directory somewhere to pivot on, and chose to
use /.oldroot

Daniel
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