>-----Original Message----- >From: lxc-users [mailto:lxc-users-boun...@lists.linuxcontainers.org] On Behalf >Of Stéphane Graber >Sent: Friday, October 07, 2016 11:46 AM >To: LXC users mailing-list >Subject: Re: [lxc-users] Establish a bind mount to a running container > >On Fri, Oct 07, 2016 at 07:03:21AM +0000, Jäkel, Guido wrote: >> Dear experts, >> >> I wonder if it's possible to establish a bind mount filesystem resource from >> the LXC host to an already running container in >an manual way, but analogous as it is done at startup time. >> >> I already figured out that the releasing an existing link is no thing; just >> umount it from inside the container. But is there a >way to establish one while shifting the destination of a bind mount into the >right namespace? >> >> I ask about, because in a couple of days I have to change a (NFS) filesystem >> source (because of an hardware migration) >that is common to a large number of running containers but not frequently used >and I want to avoid to restart all the >containers with it services. >> >> thank you for advice >> >> Guido > >It's very difficult due to a number of restrictions in place in the kernel. > >The only way of doing this that I'm aware of is what we do in LXD. We >create a path on the host before the container starts, put that on a >rshared mountpoint, then bind-mount that directory into the container >under some arbitrary path. > >Then when you want to inject a new mount in the container, you can mount >it in a sub-directory of that path you create on the host, which will >then have the container inherit the mount entry thanks to the host >mountpoint being rshared and the container's mountpoint being rslave. > >Once the mountpoint shows up in the container, you can then move it to >whatever path you actually want it on.
Dear Stéphane, I sorry, but I don't get it yet; some of your terms and where to do it are dubious to me. Maybe an example may light it up to me: Let say, I want to inject the path host:/mnt/some_host_mountpoint/some_directory as a bind mount to a running container; it should end up on container:/import/some_container_moutpoint . On the host, the mountpoint host:/mnt/some_host_mountpoint is mouted to a NFS source, let say nfshost:/some_export Now please, where to issue which commands? _______________________________________________ lxc-users mailing list lxc-users@lists.linuxcontainers.org http://lists.linuxcontainers.org/listinfo/lxc-users