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Re: [atomic-devel] Docker project: Can you have overlay2 speed and density with devicemapper? Yep.

There has been a lot of talk of also doing this with VFS back end also (Which is basically standard storage).  One of our long term goals with OCID

is to support readonly containers on an NFS store.   Which would also give us the same benefits over a COW file system.

On 10/26/2016 02:20 PM, Vishnu Kannan wrote:
*What* do you intend to surface to users? IIUC, this discussion is specific to device mapper storage drivers right?

On Tue, Oct 25, 2016 at 5:03 AM, Jeremy Eder <jeder redhat com> wrote:

Vivek Goyal (cc) and I were discussing ways to deliver page cache sharing, POSIX compliance and SELinux support with a single docker graph driver, using existing kernel facilities.  We decided to go with a bind-mount technique, and Vivek has posted a first cut here:  https://github.com/docker/docker/pull/27364

Testing of the prototype looks like a great improvement:

Assuming this type of feature is merged in a container run-time, what preference would Kube folks have for surfacing this to users ... currently it's a daemon runtime flag that says ... if you use --read-only then you get the shared-rootfs as well.  Obviously this requires "12factor-ish" design up front, because you can no longer scribble in the container filesystem in places that are not persistent volumes, but we think read-only container hygiene is well worth the security and performance improvements to be had.

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