[WIP] DUP: use Erlang clustering and allow autoscaling #1037
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Codecov ReportAll modified and coverable lines are covered by tests ✅
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## master #1037 +/- ##
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Add the DATA_UPDATER_PLANT_CLUSTERING_STRATEGY env to allow choosing which Erlang cluster topology to use. At the moment, two options are available: - `none` (default): every instance is a single-node cluster - `kubernetes`: multi-nodes cluster using k8s API. The `kubernetes` strategy requires a service account with permissions to list endpoints. Instances in the `astarte` namespace having label `app=astarte-data_updater_plant` will form an Erlang cluster. Under the hood, we have libcluster's Cluster.Strategy.Kubernetes with `:ip` option. Moreover, to support distributed Erlang (over k8s), the DUP release name includes the `MY_POD_IP` env var when it is set. If `MY_POD_IP` is not set, DUP will run in local mode, without distribution, as if it was before. Signed-off-by: Arnaldo Cesco <[email protected]>
Introduce two configuration options for the formation of DUP clusters on k8s. They can be set via two env vars: - `DATA_UPDATER_PLANT_CLUSTERING_KUBERNETES_SELECTOR`, defaulting to `app=astarte-data-updater-plant` - `DATA_UPDATER_PLANT_CLUSTERING_KUBERNETES_NAMESPACE`, defaulting to `astarte` Signed-off-by: Arnaldo Cesco <[email protected]>
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Create an Erlang cluster of DUPs which are able to autoscale and share load.
Add the
DATA_UPDATER_PLANT_CLUSTERING_STRATEGYenv to allow choosing which Erlang cluster topology to use.At the moment, two options are available:
none(default): every instance is a single-node clusterkubernetes: multi-nodes cluster using k8s API. Thekubernetesstrategy requires a service account with permissions to list endpoints.The DUP release name now includes the k8s pod IP, which can be supplied via the
MY_POD_IPenv var.When
nonestrategy is usedNothing changes w.r.t previous releases. The service will still run as not clustered.
When
kubernetesstrategy is usedA cluster of DUPs will be created - under the hood, we have libcluster's
Cluster.Strategy.Kuberneteswith:ipoption. By default, it will comprise instances in theastartenamespace having labelapp=astarte-data_updater_plant.These two values can be customized by setting the related env vars:
DATA_UPDATER_PLANT_CLUSTERING_KUBERNETES_NAMESPACEDATA_UPDATER_PLANT_CLUSTERING_KUBERNETES_SELECTORImportant
In order to form clusters, kubernetes discovery is used. Therefore, the ServiceAccount of DUP pods should have permissions to
getandlistresources of typeendpointsin the""API group.What this PR does / why we need it:
Autoscale DUP, wohoo
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Does this PR introduce a user-facing change?
Additional documentation e.g. usage docs, diagrams, etc.: