add a new service list api
Change-Id: Ib5fb86fd1f94c66604e233bfd1f56bb339b8331c
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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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Service List API
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================
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StoryBoard link: https://storyboard.openstack.org/#!/story/2004897
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This spec adds a new api for listing all vitrage services and their status.
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Problem description
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===================
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In a production cloud environment, Vitrage will have multiple services
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deployed on multiple hosts. This will enable an admin to find these services
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and get details like:
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* what is the node on which vitrage service is running,
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* what is the running status of vitrage service.
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* How long the vitrage services are running successfully.
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Proposed change
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===============
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A new api command ``vitrage service list`` will be added that will list all
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the vitrage services that are currently running, where are they running, their
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status and how long are they running.
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Example of a response
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---------------------
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.. code-block:: json
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[
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{
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"Created At": "2019-02-10T11:07:15+00:00",
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"Hostname": "controller-1",
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"Process Id": 23161,
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"Name": "ApiWorker worker(0)"
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},
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{
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"Created At": "2019-02-10T11:07:15+00:00",
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"Hostname": "controller-1",
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"Process Id": 23153,
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"Name": "EvaluatorWorker worker(0)"
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},
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{
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"Created At": "2019-02-10T11:07:15+00:00",
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"Hostname": "controller-1",
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"Process Id": 23155,
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"Name": "EvaluatorWorker worker(1)"
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},
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{
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"Created At": "2019-02-10T11:07:15+00:00",
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"Hostname": "controller-1",
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"Process Id": 23157,
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"Name": "EvaluatorWorker worker(2)"
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},
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{
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"Created At": "2019-02-10T11:07:15+00:00",
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"Hostname": "controller-1",
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"Process Id": 23158,
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"Name": "EvaluatorWorker worker(3)"
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},
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{
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"Created At": "2019-02-10T11:07:33+00:00",
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"Hostname": "controller-1",
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"Process Id": 23366,
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"Name": "MachineLearningService worker(0)"
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},
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{
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"Created At": "2019-02-10T11:07:35+00:00",
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"Hostname": "controller-1",
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"Process Id": 23475,
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"Name": "PersistorService worker(0)"
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},
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{
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"Created At": "2019-02-10T11:07:15+00:00",
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"Hostname": "controller-1",
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"Process Id": 23164,
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"Name": "SnmpParsingService worker(0)"
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},
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{
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"Created At": "2019-02-10T11:14:30+00:00",
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"Hostname": "controller-1",
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"Process Id": 25698,
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"Name": "vitrageuWSGI worker 1"
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},
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{
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"Created At": "2019-02-10T11:14:30+00:00",
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"Hostname": "controller-1",
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"Process Id": 25699,
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"Name": "vitrageuWSGI worker 2"
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},
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{
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"Created At": "2019-02-10T11:07:32+00:00",
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"Hostname": "controller-1",
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"Process Id": 23352,
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"Name": "VitrageNotifierService worker(0)"
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}
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]
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CLI Example
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-----------
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.. code-block:: console
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+----------------------------------+------------+--------------+---------------------------+
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| Name | Process Id | Hostname | Created At |
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+----------------------------------+------------+--------------+---------------------------+
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| ApiWorker worker(0) | 23161 | controller-1 | 2019-02-10T11:07:15+00:00 |
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| EvaluatorWorker worker(0) | 23153 | controller-1 | 2019-02-10T11:07:15+00:00 |
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| EvaluatorWorker worker(1) | 23155 | controller-1 | 2019-02-10T11:07:15+00:00 |
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| EvaluatorWorker worker(2) | 23157 | controller-1 | 2019-02-10T11:07:15+00:00 |
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| EvaluatorWorker worker(3) | 23158 | controller-1 | 2019-02-10T11:07:15+00:00 |
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| MachineLearningService worker(0) | 23366 | controller-1 | 2019-02-10T11:07:33+00:00 |
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| PersistorService worker(0) | 23475 | controller-1 | 2019-02-10T11:07:35+00:00 |
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| SnmpParsingService worker(0) | 23164 | controller-1 | 2019-02-10T11:07:15+00:00 |
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| vitrageuWSGI worker 1 | 25698 | controller-1 | 2019-02-10T11:14:30+00:00 |
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| vitrageuWSGI worker 2 | 25699 | controller-1 | 2019-02-10T11:14:30+00:00 |
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| VitrageNotifierService worker(0) | 23352 | controller-1 | 2019-02-10T11:07:32+00:00 |
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+----------------------------------+------------+--------------+---------------------------+
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**Note:**
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The cloud operator must pre-install zookeeper or other tooz backend component.
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Otherwise, an exception will be raised when users call the service REST API.
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If vitrage is running in k8s cluster then this api might be redundant.
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Since k8s handles pods health and topology. We might make the service api
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communicate with the k8s api in this case to get all vitrage services and
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their statuses.
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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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New api will be added to vitrage to list the services.
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Versioning 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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In order to support the api we will need a backend to store the information.
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We will use the tooz library that supports multiple backends see Tooz_.
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.. _Tooz: https://docs.openstack.org/tooz/latest/
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Deployer impact
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---------------
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The deployer must pre-install zookeeper or other tooz backend component
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In order to support the API.
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When deploying a container then hostname must be changed
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so api will be readable.
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Developer impact
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----------------
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We need to think what to do in case of a container deployment.
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docker by default has a hostname of the container id but it can be changed.
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We might use an optional environment variable (e.g HOST_HOSTNAME) for host name
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if exist in case of a container that can be passed to the container.
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Horizon 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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Eyal
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Work Items
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----------
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* add tooz support
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* add new API to vitrage
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* add `service list` to vitrage client
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* Documentation and tests
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Dependencies
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============
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Depends on the tooz library with a backend configured.
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Testing
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=======
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Unit tests, functional tests and tempest tests
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Documentation Impact
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====================
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The new api will be documented
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References
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==========
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None
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