[Lxc-users] [lxc-users] Sharing the host /lib with ubuntu 10.04 guest

[Serge E. Hallyn]

Quoting Pierre-François Bonnefoi (pierre-francois.bonnefoi at unilim.fr):
> hello,
> 
> I've encountered a new problem :
> I would like to decrease the disk usage of my container by sharing some big directories.
> When I try to share the /lib directory between my host under Ubuntu 10.04 with my guest under Ubuntu 10.0.4, I've got the problem that the file /lib/init/fstab from the host is shared with the container and create some panic with some not needed mounts.
> I've try to define a /etc/fstab but I can't prevent the guest system to analyze the /lib/init/fstab file.
> (And I don't want to modify my host Ubuntu...).
> 
> How could I perform this ?

Hm, I'm not sure about the sequence of events, but I suspect you could
put

	/etc/containerfstab /lib/init/fstab	none	defaults 0 0

into /var/lib/lxc/${CONTAINERNAME}/fstab.  That should happen
after the mounts namespace has been unshared, and before the
container's init process does mountall.  A good start for /etc/containerfstab
might be the stock container fstab:

######################################################
# /lib/init/fstab: lxc system fstab
none            /spu                      spufs           gid=spu,optional                  0 0
none            /tmp                      none            defaults                          0 0
none            /var/lock                 tmpfs           nodev,noexec,nosuid,showthrough   0 0
none            /lib/init/rw              tmpfs           mode=0755,nosuid,optional         0 0
######################################################

-serge