Difference between revisions of "Cinder/blueprints/read-only-volumes"
m (Anastasia Guzikova moved page Cinder/blueprints/read-only to Cinder/blueprints/read-only-volumes) |
|
(No difference)
|
Revision as of 10:00, 3 July 2013
- Launchpad Entry: CinderSpec:read-only-volumes
- Created: 3 July 2013
- Contributors: Anastasia Guzikova
Contents
Summary
Note this is a big spec and where possible it is broken down into sub-specs to make it easier to share work.
Release Note
Rationale
User stories
The purpose is to provide the ability to attach volumes in the read-only mode.
Some examples
- unmutable 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
How can you use Read Only volumes
Create a Read Only by default volume
{ POST /v1/<tenant_id>/volumes body: { "volume": { "status": "creating", ''read_only": true,'' "availability_zone": null, "source_volid": null, "display_description": null, "snapshot_id": null, "user_id": null, "size": 1, "display_name": null, "imageRef": null, "attach_status": "detached", "volume_type": null, "project_id": null, "metadata": {} } }
Notice "read_only" is added here.
Create a VolumePermission to get Read/Write permission for User or Project:
{ POST /v1/<tenant_id>/os-volume-permission body: { "volume_permission": { "volume_id": null, "read_only": false, "project_id": null, "user_id": null, } }
Assumptions
Design
Workflow is:
Read Only volumes
Add an ability to mark a volume as Read Only by default. Add an ability to create ACL for a volume.
"Blueprint: https://blueprints.launchpad.net/cinder/+spec/read-only-volumes"
Implementation
This section should describe a plan of action (the "how") to implement the changes discussed. Could include subsections like:
API Changes
- new volume permission resource
Code Changes
Code changes should include an overview of what needs to change, and in some cases even the specific details.
Migration
Include:
- data migration, if any
- redirects from old URLs to new ones, if any
- how users will be pointed to the new way of doing things, if necessary.
Test/Demo Plan
This need not be added or completed until the specification is nearing beta.
Unresolved issues
BoF agenda and discussion
Use this section to take notes during the BoF; if you keep it in the approved spec, use it for summarising what was discussed and note any options that were rejected.