change container root password from the host

Change a container's root password (you forgot) from the host.

I think that the easiest way is to run passwd chrooted to the container's root.

e.g. for the squeezie host created by the squeeze template

# chroot /var/lib/lxc/squeezie/rootfs/ passwd
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully

Change a container's root password from the host