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labels_secondary_dsi_objects.md

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Labels of Secondary Data Service Instances Resources

The labels of secondary resources belonging to a DSI, such as pods, are the union of three groups of labels :

labels:
    <a8s reserved labels>
    <DSI labels>
    <DataService specific labels>

<a8s reserved labels> are labels that a8s manages and needs to correctly manage the DSIs. These labels are shown below:

labels:
    a8s.a9s/dsi-group: <API group of the DSI CRD>   
    a8s.a9s/dsi-kind: <kind of the CR>
    a8s.a9s/dsi-name: <name of the instance defined in the CR>

<DSI labels> are just the metadata labels of the DSI CustomResource.

Some data services may have additional labels, you will find them in the following sections.

PostgreSQL

The PostgreSQL pods also have the following labels:

  a8s.a9s/replication-role: <role of the pod, either master or replica>
  # Managed by Kubernetes
  controller-revision-hash: <contains hash of current pod template>
  statefulset.kubernetes.io/pod-name: <name of the pod in the statefulset>

For example the master pod of a PosgreSQL instance with labels

labels:
  test-label: "test"

will have the labels:

labels:
  a8s.a9s/dsi-group: postgresql.anynines.com
  a8s.a9s/dsi-kind: Postgresql
  a8s.a9s/dsi-name: sample-pg-cluster
  a8s.a9s/replication-role: master
  controller-revision-hash: sample-pg-cluster-86765dfc5d
  statefulset.kubernetes.io/pod-name: sample-pg-cluster-0
  test-label: test