[lxc-devel] Reg: Using an ISO image as rootfs for a LXC

[Alphonse Hansel Anthony]

Hi Daniel,

  I am using lxc utils (0.7.4.2).
  In my case, I am trying to mount the rootfs.iso as "/" within the
Container and it fails with "No such file or directory".

I am just wondering if any additional options are required to make the
mounted ISO visible across pivot_root boundaries, similar to "MS_BIND" mount
option for files/directories.

Can you copy-paste your lxc.conf file? I would like to cross verify with
options that I had specified.

    The second case that you had mentioned works for me.
  My rootfs is a directory on the host ( /root/lxcOne )
  Mount point for iso with rootfs (/root/lxcOne/mnt)
  After I add the mount options in fstab, I am able to view the content in
</root/lxcOne>/mnt
  directory.

  -Alphonse



On Mon, Jul 25, 2011 at 4:04 PM, Daniel Lezcano <daniel.lezcano at free.fr>wrote:

> On 07/25/2011 08:17 PM, Alphonse Hansel Anthony wrote:
> >  Hi,
> >   I am trying to start a LXC, with a ISO image as the rootfs.
> >
> > the excerpt of the mount options that I use in lxc.conf
> >
> > lxc.rootfs = rootfs.iso
> > lxc.rootfs.mount = /lxc/rootfs
> >
> > The error that I get while I start the LXC
> >
> > -----
> > lxc-start: No such file or directory - failed to exec /sbin/init
> > lxc-start: invalid sequence number 1. expected 2
> > lxc-start: failed to spawn 'raven'
> > lxc-start: Device or resource busy - failed to remove cgroup
> '/cgroup/raven'
> > ------
> >
> > on closer look at the lxc-start , I found the following
> >
> > 1) the iso image is mounted at the specified location
> > 2) I am also able to stat the /sbin/init file.
> >
> > I instrumented the code in file ${SRC_FOLDER}/src/lxc/start.c:: static
> > int start(struct lxc_handler *handler, void* data)
> > and I am able to stat the file /sbin/init just before execvp, but exec
> > fails with "No such file or directory".
> >
> > Any help in this regard would be useful.
>
> I created a ISO image and started the container. The container starts as
> expected (but the mountall fails because the rootfs is RO.)
> Is it possible the iso image contains an extra directory where the
> rootfs belongs ? I mean, if you mount the iso image on a directory
> 'mnt', you should see '/mnt/usr, /mnt/lib, ...' is it the case ?
>
>
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