Spec: Add backup volume by glance protection plugin
Change-Id: Ifdedf65c0628683e4c1e9c2eb8909326138cf4c6 Implements: blueprint backup-volume-data-to-bank
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jiaopengju
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@ -34,6 +34,7 @@ Approved Specs
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freezer-protection-plugin
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kubernetes-pods-protection-plugin
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checkpoint-verify-api
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volume-glance-protection-plugin
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Spec Template
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-------------
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@ -0,0 +1,186 @@
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..
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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============================================
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Glance based cinder volume protection plugin
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============================================
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https://blueprints.launchpad.net/karbor/+spec/backup-volume-data-to-bank
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Problem description
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===================
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Currently, karbor support using cinder backup, cinder snapshot and freezer
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plugins to do cinder volume backup. These plugins all store the backup metadata
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to the bank but not the volume backup data.
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In the use case of cross site, we need to do cinder volume backup and restore
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cross different sites (with different cinder/nova/glance service endpoints),
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this requires karbor to save the volume data in an independent storage media
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(bank), so that we can do backup in one site and do restore in another site
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that the two sites use the same volume backup data in one bank.
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Obviously the cinder volume protection plugins in karbor can not satisfy the
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cross site needs now. So we should introduce a new volume protection plugin
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which can save volume data to karbor's bank, like image protection plugin.
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Backup cinder volume through glance may be a valid choice.
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Use Cases
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=========
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As explained, users who want to do cross site backup and restore of cinder
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volumes.
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Proposed change
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===============
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Volume glance protection plugin
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-------------------------------
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Add a new volume protection plugin which do the backup and restore of cinder
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volumes by glance service. Volume data would be stored in the bank as chunks
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like what image protection plugin do.
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Steps of protect operation:
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1. Create a temporary snapshot to the volume you want to backup
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2. Create a temporary volume based on the snapshot in step 1
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3. Create a temporary glance image of the temporary volume
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4. Download the temporary image and save it to karbor bank
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5. Clean all the temporary resources in step 1 to 4
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6. Save the backup metadata to bank
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Steps of restore operation:
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1. Create an image with the volume data in bank
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2. Create a volume with the created image in step 1
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3. Wait for the volume status being available
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4. Clean the created image in step 1
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Steps in delete operation:
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1. List and delete the objects (volume data and metadata) in bank.
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Volume glance protection plugin schema:
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---------------------------------------
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::
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OPTIONS_SCHEMA = {
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"title": "Volume Glance Protection Options",
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"type": "object",
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"properties": {
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"backup_name": {
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"type": "string",
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"title": "Backup Name",
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"description": "The name of the backup.",
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"default": None
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},
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"description": {
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"type": "string",
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"title": "Description",
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"description": "The description of the backup."
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}
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},
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"required": ["backup_name"]
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}
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RESTORE_SCHEMA = {
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"title": "Volume Glance Protection Restore",
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"type": "object",
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"properties": {
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"restore_name": {
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"type": "string",
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"title": "Restore Resource Name",
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"description": "The name of the restore resource ",
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"default": None
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},
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},
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"required": ["restore_name"]
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}
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Alternatives
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------------
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None
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Data model impact
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-----------------
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None.
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REST API impact
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---------------
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None
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Security impact
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---------------
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None
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Notifications impact
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--------------------
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None
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Other end user impact
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---------------------
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None
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Performance Impact
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------------------
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This plugin may be slower than cinder backup and cinder snapshot plugin.
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Other deployer impact
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---------------------
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Add the volume by glance protection plugin endpoint to setup.cfg.
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Add the volume by glance protection plugin configuration to provider file.
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Developer impact
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----------------
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None
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Implementation
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==============
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Assignee(s)
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-----------
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Primary assignee:
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Pengju Jiao <jiaopengju@cmss.chinamobile.com>
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Work Items
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----------
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* Write volume by glance protection plugin
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* Write tests
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Dependencies
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============
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None
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Testing
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=======
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Unit tests in Karbor.
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Documentation Impact
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====================
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Add a usage example about volume by glance protection.
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References
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==========
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None
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