[Lxc-users] how to mount inside of running container

[Arie Skliarouk]

Hi,

Thank you for the instructions, but looks I did something wrong.

If I create files on the /shared/containerX, they appear properly in
the container's /shared directory. If I create a directory in the
/shared/containerX directory and mount some other partition onto that
/shared/containerX/an_partition directory, the partition's content
appear empty inside of the container. It shows properly though on the
host machine.

Aren't --make-rshared and --make-rslave counterexclusive?

--
Arie


On Wed, Sep 21, 2011 at 20:26, Serge E. Hallyn
<serge.hallyn at canonical.com> wrote:
> Quoting Arie Skliarouk (skliarie at gmail.com):
>> I want to bind-mount an directory inside of a running container.
>> If I mount the directory using bind mount, the container does not see
>> files in it.
>>
>> It is important to me to be able to do the mounts and umounts from the
>> host machine, as we are dealing with LVM snapshots.
>
> If it's ok to do it ahead of time, then you can use mount entries in
> your config file.
>
> If you want to be able to just manually run the mount command from
> the host at any time, then you'll need to create a directory for
> the sharing and mount that into your container ahead of time.  For
> instance,
>
> mkdir /share/containerX
> mkdir /var/lib/lxc/containerX/rootfs/share
> mount -t tmpfs share /share/containerX
> mount --make-rshared /share/containerX
> mount --make-rslave /share/containerX
> cat >> /var/lib/lxc/containerX/fstab << EOF
> /share/containerX /var/lib/lxc/containerX/rootfs/share none bind 0 0
> EOF
>
> lxc-start -n containerX -d
>
> Now when you mount something under /share/containerX, it will show
> up under /share in the container.  I.e.
>
> -serge
>