Cinder

Read-only Volumes

Registered by Dmitry Russkikh on 2013-06-17

Provide the ability to attach volumes in the read-only mode. Read-only mode could be ensured by hypervisor configuration during the attachment.
Libvirt, Xen, VMware and Hyper-V support R/O volumes.

Use cases:
  - immutable volumes
  - cinder as a backend for glance https://blueprints.launchpad.net/glance/+spec/glance-cinder-driver
  - shared volume https://blueprints.launchpad.net/cinder/+spec/shared-volume

Blueprint information

Status:: Complete

Approver:: John Griffith

Priority:: Medium

Drafter:: Dmitry Russkikh

Direction:: Approved

Assignee:: Anastasiia Guzikova

Definition:: Approved

Series goal:: Accepted for havana

Implementation:: Implemented

Milestone target:: 2013.2

Started by: Dmitry Russkikh on 2013-06-25

Completed by: John Griffith on 2013-09-03

Related branches

Related bugs

Sprints

Whiteboard

Implementation plan:
  - Add field 'readonly' (boolean) to 'volumes' table in Cinder DB
  - Add support of 'readonly' parameter in create and update operations in Cinder API
  - Add support of 'readonly' parameter in create and update operations in Cinder CLI client (python-cinderclient)
  - Visualize 'readonly' parameter in Horizon UI (volume create, volume list, volume details operations)
  - Modify logic of volume attachment operation in Nova - use 'read_only' option while configuring hypervisor for attaching Volume with 'readonly' option to a VM. Implement for all available virt drivers.

Gerrit topics: https://review.openstack.org/#q,topic:bp/read-only-volumes,n,z

cinder:https://review.openstack.org/#/c/34723/
python-cinderclient: https://review.openstack.org/#/c/34720/
nova: https://review.openstack.org/#/c/34722/
horizon: https://review.openstack.org/#/c/34724/