105 lines
2.7 KiB
ReStructuredText
105 lines
2.7 KiB
ReStructuredText
..
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This work is licensed under a Creative Commons Attribution 3.0 Unported License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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=========================
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Policy-based partitioning
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=========================
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https://blueprints.launchpad.net/bareon/+spec/policy-based-partitioning
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Problem description
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===================
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We need the ability to verify the disposition of existing partitions during
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deployment. Bareon agent should support the prevention of modification of
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existing partitions during deployment when requested by the user or
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administrator.
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Proposed change
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===============
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NOTE: This change is added with a standalone "Ironic" data driver.
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NOTE: This is a contribution of the feature developed within Cray OpenStack project.
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We will try to make a minimum changes to existing code.
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We introduce the new attribute in provision.json, called
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partitions_policy. This policy will control the way of how partitions are
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applied. The partitions_policy, working together with “keep_data” attribute
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of partition/lv will control the data retention. The policy can be either:
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* **verify**
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- Do verification: Compare partitions schema with existing partitions on the
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disk(disks). If there is an additional disk, not mentioned in schema
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(unknown) - it is ignored.
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- Do partitioning: partitions which do not have “keep_data” attribute are left
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as is (keep_data attribute is true by default); partitions which have
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“keep_data”:false attribute in schema are wiped;
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* **clean**
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Ignore existing partitions on the disk(disks). Clean the disk and create
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partitions according to the schema. If there is an additional disk, not
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mentioned in schema (unknown) - it is ignored.
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For example:
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::
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{
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"partitions_policy": "<verify|clean>",
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"partitions": [{
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"type":"disk",
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"id": ...,
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"volumes":[
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{
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"type":"partition",
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"id": …,
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# "keep_data": true - by default
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},
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{
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"id": …,
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"keep_data": false, # this partition will be wiped
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# (explicitly specified keep_data false here)
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},
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],
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}
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Alternatives
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------------
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There's already a keep_data flag in Nailgun driver, however it is impossible to
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verify HW partitions. So no alternatives to the current proposal.
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Implementation
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==============
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Assignee(s)
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-----------
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- max_lobur
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Milestones
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----------
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See blueprint ref above.
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Work Items
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----------
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- Rebase onto Bareon master
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Dependencies
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============
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The code of this feature is on top of the following patches:
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- rsync image deployment
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- functional tests
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thus needs to be prosed after these. |