[Lxc-users] LLS=LXC+LVM+Snapshots

[Arie Skliarouk]

Hi,

In our company we deal with massive datasets that needs to be easy to copy,
modify a fraction of it and scrape. Snapshotting is an ideal solution here.

I started writing LLS scripts (will opensource them upon completion) that
enable users to snapshot existing physical volumes and mount them from
inside of the container.

For that there is a daemon script on the host and client scripts on the
vservers. The clients communicate with the server over a named pipe in a
shared (bind mount) directory /lls (lls - LXC+LVM+Snapshots). The directory
is actually a small partition that is mounted with --make-rshared flag on
the host. The partition is mounted on each vserver. This enables a snapshot
to be created on the host machine, mounted onto some /lls/snapshot_version
directory and thus become visible to all vservers (security is not an issue
here).

This works as long as the vservers are up and running.

If some partition is mounted onto /lls/abc, the partition is no longer
visible after a vserver is started (it appears empty, both from the host
and from the vserver). I suspect this relates to the way bind mount works.

Please help me to understand the way bind mount work.

PS. If you have a different approach to propose, please share.

--
Arie
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