116 lines
3.4 KiB
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116 lines
3.4 KiB
ReStructuredText
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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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Moving to ceph-ansible for Kolla
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=================================
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It has been discussed within the Kolla community that we should look at moving
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from our own orchestration and containers for Ceph to those provided by the
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'ceph-ansible' project. This spec proposes how this should happen.
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Problem description
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===================
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Ceph is a complex project that exists outside of OpenStack. As new versions of
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Ceph are released, the Kolla community have had to spend time and resources
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ensuring that our implementation is up to date, upgrade works correctly, etc,
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in addition to the multiple OpenStack services we support. Meanwhile, there are
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other existing projects that work just on Ceph, and can potentially do this
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much better.
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Use cases
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---------
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1. Ceph deployment using dedicated Storage nodes
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2. Ceph deployment using HCI nodes (storage nodes on compute nodes)
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Proposed change
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===============
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ceph-ansible is one such project that is part of the official Ceph
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project namespace[0]. This gives us a reasonable degree of certainty that it
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can provide a more complete and well maintained implementation of Ceph than
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Kolla can provide on its own.
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Alternatives
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------------
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Continue to maintain current approach i.e. Ceph deployment in kolla-ansible.
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Other End User impact
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---------------------
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We will need to move to images that ceph-ansible supports, we have two options:
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1. Directly use what is available on docker hub[1].
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2. Build images using ceph-container repo[2].
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NOTE: Currently ceph-container project does not support Ubuntu container images.
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Security impact
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---------------
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From a high level this should not have any security impact. It is possible
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security would be even improved over what we have now, due to the active
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community maintaining the ceph-ansible project[3].
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Performance Impact
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------------------
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We see no potential performance impact. The time for deploying ceph-ansible may
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end up being slightly longer or shorter when compared to Kolla's Ceph, but the
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difference should not be big.
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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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mnasiadka
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Milestones
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----------
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Target Milestone for completion:
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U
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Work Items
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----------
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1. Mark the current implementation of Ceph in Kolla as deprecated in the Train
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cycle. The ceph-ansible implementation should be ready for the release of
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U.
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2. Provide concise documentation on how a Kolla operator should go about
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deploying ceph-ansible in a way that's consistent with Kolla best practices.
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3. Ensure we have a sensible and easy to follow upgrade path for those
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currently running Kolla's implementation of Ceph in production.
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4. The current Kolla gates for Ceph will need to be updated.
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5. (Optional) Create a playbook for ceph-ansible integration - similar to the one OpenStack-Ansible
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project has developed[4].
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Testing
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=======
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See work item number 4 above.
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Documentation Impact
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====================
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See work item number 2 above.
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References
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==========
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[0] http://docs.ceph.com/ceph-ansible/master/
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[1] https://hub.docker.com/r/ceph/daemon
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[2] https://github.com/ceph/ceph-container
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[3] https://github.com/ceph/ceph-ansible/graphs/contributors
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[4] https://opendev.org/openstack/openstack-ansible/src/branch/master/playbooks/ceph-install.yml
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