Re: Safe to use RBD mounts for Docker volumes on containerized Ceph nodes

[David Turner <drakonstein@xxxxxxxxx>]

The problem is with the kernel pagecache. If that is still shared in a containerized environment with the OSDs in containers and RBDs which are married on The node outside of containers, then it is indeed still a problem. I would guess that's the case, but I do not know for certain. Using rbd-nbd instead of krbd bypasses this problem and you can ignore it. Only using krbd is problematic.

On Thu, Sep 6, 2018, 6:43 PM Jacob DeGlopper <jacob@xxxxxxxx> wrote:

I've seen the requirement not to mount RBD devices or CephFS filesystems
on OSD nodes.  Does this still apply when the OSDs and clients using the
RBD volumes are all in Docker containers?

That is, is it possible to run a 3-server setup in production with both
Ceph daemons (mon, mgr, and OSD) in containers, along with applications
in containers using Ceph as shared storage (Elasticsearch, gitlab, etc)?

     -- jacob

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