libvirt users - Dec 2011 - read-only rootfs for lxc containers

And speaking of running out of a shared read-only root, I get the
following error when I attempt it:

error: Failed to start domain hw
error: internal error guest failed to start: PATH=/bin:/sbin TERM=linux
LIBVIRT_LXC_UUID=38320e75-1ba0-d85a-6138-532a3a66f13d
LIBVIRT_LXC_NAME=hw /bin/bash
2011-12-08 15:31:41.945: 1: info : libvirt version: 0.9.7
2011-12-08 15:31:41.945: 1: error : lxcContainerPivotRoot:345 : Failed
to create /mnt/vmroot/.oldroot: Read-only file system
2011-12-08 15:31:41.945: 2666: info : libvirt version: 0.9.7
2011-12-08 15:31:41.945: 2666: error : lxcControllerRun:1210 : error
receiving signal from container: Input/output error


XML: http://pastebin.com/Q0p5irBH


Cheers,


-C-

On Thu, Dec 08, 2011 at 07:34:13AM -0800, Chris Haumesser
wrote:
> And speaking of running out of a shared read-only root, I get the
> following error when I attempt it:
> 
> error: Failed to start domain hw
> error: internal error guest failed to start: PATH=/bin:/sbin TERM=linux
> LIBVIRT_LXC_UUID=38320e75-1ba0-d85a-6138-532a3a66f13d
> LIBVIRT_LXC_NAME=hw /bin/bash
> 2011-12-08 15:31:41.945: 1: info : libvirt version: 0.9.7
> 2011-12-08 15:31:41.945: 1: error : lxcContainerPivotRoot:345 : Failed
> to create /mnt/vmroot/.oldroot: Read-only file system
> 2011-12-08 15:31:41.945: 2666: info : libvirt version: 0.9.7
> 2011-12-08 15:31:41.945: 2666: error : lxcControllerRun:1210 : error
> receiving signal from container: Input/output error
Hmm, so your actual filesystem on the host side is read only ?

I'd not considered that possibilty. When I've done read-only
roots for containers, the host side was always writable, and
then I used  '<readonly/>' in the <filesystem> tag to make
the container see it readoly.


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.

Daniel
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