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CKA study material · question 667 of 1000

A Pod carries a toleration with an empty key and the operator Exists, and no effect. What does it tolerate?

  1. Only taints with an empty key
  2. Every taint on every node
  3. Nothing; an empty key is rejected
  4. Only NoSchedule taints, whatever their key
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Answer: B. Every taint on every node

An empty key with Exists matches all keys and values, and an empty effect matches all effects — together they tolerate everything, which is why such a toleration is used sparingly.

Source: Taints and Tolerations (Kubernetes) — Concepts

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