Add operation: Implement automatic Glance image updates
Add a cloud operation for enabling automatic Glance image updates using the glance-simplestreams-sync charm Change-Id: I5518af89e11c2f2f5de008f89050b73c286cf22a
This commit is contained in:
Peter Matulis
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@ -14,3 +14,4 @@ having these operations applied to it.
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* :doc:`Scale back an application with the hacluster charm <ops-scale-back-with-hacluster>`
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* :doc:`Scale out the nova-compute application <ops-scale-out-nova-compute>`
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* :doc:`Start MySQL InnoDB Cluster from a complete outage <ops-start-innodb-from-outage>`
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* :doc:`Implement automatic Glance image updates <ops-auto-glance-image-updates>`
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@ -0,0 +1,145 @@
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:orphan:
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========================================
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Implement automatic Glance image updates
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========================================
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Preamble
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--------
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An OpenStack cloud generally benefits from making available the most recent
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cloud images as it minimizes the need to perform software updates on its VMs.
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It is also convenient to automate the process of updating these images. This
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article will show how to accomplish all this with the
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`glance-simplestreams-sync`_ charm.
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Requirements
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------------
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The glance-simplestreams-sync charm places Simplestreams metadata in Object
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Storage via the cloud's ``swift`` API endpoint. The cloud will therefore
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require the presence of either Swift (`swift-proxy`_ and `swift-storage`_
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charms) or the Ceph RADOS Gateway (`ceph-radosgw`_ charm).
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Procedure
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---------
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Deploy the software
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~~~~~~~~~~~~~~~~~~~
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Deploy the glance-simplestreams-sync application. Here it is containerised on
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machine 1:
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.. code-block:: none
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juju deploy --to lxd:1 glance-simplestreams-sync
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juju add-relation glance-simplestreams-sync:identity-service keystone:identity-service
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juju add-relation glance-simplestreams-sync:certificates vault:certificates
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We are assuming that the cloud is TLS-enabled (hence the Vault relation).
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.. note::
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The glance-simplestreams-sync charm sets up its own ``image-stream``
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endpoint. However, it is not utilised in this present scenario. It is
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leveraged when using OpenStack as a backing cloud to Juju.
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Configure image downloads
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~~~~~~~~~~~~~~~~~~~~~~~~~
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The recommended way to configure image downloads is with a YAML file. As an
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example, we'll filter on the following:
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* Bionic and Focal images
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* arm64 and amd64 architectures
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* officially released images and daily images
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* the latest of each found image (i.e. maximum of one)
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To satisfy all the above place the below configuration in, say, file
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``~/gss.yaml``:
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.. code-block:: yaml
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glance-simplestreams-sync:
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mirror_list: |
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[{ url: 'http://cloud-images.ubuntu.com/releases/',
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name_prefix: 'ubuntu:released',
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path: 'streams/v1/index.sjson',
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max: 1,
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item_filters: ['arch~(arm64|amd64)', 'ftype~(uefi1.img|uefi.img|disk1.img)', 'release~(bionic|focal)']
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},
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{ url: 'http://cloud-images.ubuntu.com/daily/',
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name_prefix: 'ubuntu:daily',
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path: 'streams/v1/index.sjson',
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max: 1,
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item_filters: ['arch~(arm64|amd64)', 'ftype~(uefi1.img|uefi.img|disk1.img)', 'release~(bionic|focal)']
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}
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]
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Now configure the charm by referencing the file:
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.. code-block:: none
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juju config --file ~/gss.yaml glance-simplestreams-sync
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.. note::
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If a configuration is not provided the applications's default behaviour is
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to download the latest official amd64 image for each of the last four LTS
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releases.
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Enable automatic image updates
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Enable automatic image updates via the ``run`` option. Here we also specify
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checks to occur on a weekly basis:
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.. code-block:: none
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juju config glance-simplestreams-sync frequency=weekly run=true
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Valid frequencies are 'hourly', 'daily', and 'weekly'.
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Perform a manual image sync (optional)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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A manual image sync can optionally be performed with the ``sync-images``
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action:
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.. code-block:: none
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juju run-action --wait glance-simplestreams-sync/leader sync-images
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Sample output:
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.. code-block:: console
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unit-glance-simplestreams-sync-0:
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UnitId: glance-simplestreams-sync/0
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id: "32"
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results:
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.
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.
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.
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created 12b3415c-8f50-491f-916c-e08ba4da71c5: auto-sync/ubuntu-bionic-18.04-amd64-server-20210720-disk1.img
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created 73ea8a47-1b1f-48cf-b216-c7eba38d96ab: auto-sync/ubuntu-bionic-18.04-arm64-server-20210720-disk1.img
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created 37d7aeff-5ccb-4a4a-9258-f7948df4caa2: auto-sync/ubuntu-focal-20.04-amd64-server-20210720-disk1.img
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created 10acb4a1-ed7d-4a43-b14c-49d646f23b87: auto-sync/ubuntu-focal-20.04-arm64-server-20210720-disk1.img
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created 90d308d3-cf23-49da-a625-c50a55286d94: auto-sync/ubuntu-bionic-daily-amd64-server-20210720-disk1.img
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created aafa3f2b-002b-4b1c-a212-d99d858bf6b7: auto-sync/ubuntu-bionic-daily-arm64-server-20210720-disk1.img
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created 350d4537-cb8d-445b-a62f-6a1ad15ce3b7: auto-sync/ubuntu-focal-daily-amd64-server-20210720-disk1.img
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created 63f75ea0-e55f-499a-92bc-d02f46126834: auto-sync/ubuntu-focal-daily-arm64-server-20210720-disk1.img
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status: completed
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timing:
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completed: 2021-07-23 22:37:28 +0000 UTC
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enqueued: 2021-07-23 22:22:49 +0000 UTC
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started: 2021-07-23 22:22:54 +0000 UTC
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This output should reflect the information available via the
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:command:`openstack image list` command.
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.. LINKS
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.. _glance-simplestreams-sync: https://jaas.ai/glance-simplestreams-sync
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.. _ceph-radosgw: https://jaas.ai/ceph-radosgw
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.. _swift-proxy: https://jaas.ai/swift-proxy
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.. _swift-storage: https://jaas.ai/swift-storage
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