Share volume within capsule

[hongbin]

Create a capsule with a Cinder volume and two containers. The Cinder volume should be able to mounted into both containers. In other words, the following capsule should work:

$ cat capsule.yaml
capsuleVersion: beta
kind: capsule
metadata:
  name: init-demo
spec:
  restartPolicy: Never
  containers:
  - image: cirros
    command:
    - ls
    - /workdir/
    volumeMounts:
    - name: workdir
      mountPath: /workdir
  - image: cirros
    command:
    - touch
    - /workdir/hello
    volumeMounts:
    - name: workdir
      mountPath: /workdir
  volumes:
  - name: workdir
    cinder:
      size: 1

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/593482

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/599902
Committed: https://git.openstack.org/cgit/openstack/zun/commit/?id=0ac04cc1bfa91e03b3613aa559ca97c353bf186a
Submitter: Zuul
Branch: master

commit 0ac04cc1bfa91e03b3613aa559ca97c353bf186a
Author: Hongbin Lu <email address hidden>
Date: Wed Sep 5 03:15:52 2018 +0000

    Split volume_mapping table into two

    Split out volume_connection from volume_mapping table.
    * The volume_connection table will record information about a
      connection between a compute host and a cinder volume.
    * The volume_mapping table will record information about
      a mapping between a container and a local volume.

    We need this spliting to make the data model right. In particular,
    this will be a better data model for doing volume connect/disconnect,
    volume mounting/unmounting, and in the future, support sharing a
    local volume by multiple containers.

    Partial-Bug: #1787855
    Change-Id: I1dcc70e15a82e419398f4b4364ac6733d5990e28

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/593482
Committed: https://git.openstack.org/cgit/openstack/zun/commit/?id=04a186eddeccdf44c5740b3f9b690acb61dcf6a1
Submitter: Zuul
Branch: master

commit 04a186eddeccdf44c5740b3f9b690acb61dcf6a1
Author: Hongbin Lu <email address hidden>
Date: Mon Aug 20 04:16:24 2018 +0000

    Allow volume to be shared across capsule

    This allows a cinder volume to be shared by multiple containers
    that are in the same capsule. This is for supporting the use
    cases that multiple containers inside the capsule read/write
    to a shared storage.

    Change-Id: Ia7a14e52d03b50cfe19d8959e715ebc7f4c3f1d2
    Closes-Bug: #1787855

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/zun 3.0.0.0rc1 release candidate.