Kubernetes Selector

Definition:

• select objects based on labels
• unlike names and UIDs, objects are not expected to have same labels

Equity-based requirement:

• environment = prod
• environment == prod
• environment != prod

Set-based requirement

• environment in (production, qa)
• tier notin (frontend, backend)
• partition if label exist
• !partition: if label doesnt exist

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API

• matchExpressions
  • key
  • operator (In, NotIn, Exists, DoesNotExist)
  • values
• matchLabels: map[string]string