Kubernetes - Operators and Custom Resources
What will happen if you try to create a Custom Resource instance before its CustomResourceDefinition is applied?
What will happen if you try to create a Custom Resource instance before its CustomResourceDefinition is applied?
medium📝 Command Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand dependency on CRD
Kubernetes must know the resource type from the CRD before creating instances.Step 2: Predict behavior without CRD
Without CRD, kubectl does not recognize the resource type and returns an error.Final Answer:
kubectl will return an error saying the resource type is unknown -> Option BQuick Check:
Create resource before CRD = error unknown resource [OK]
Quick Trick: Always apply CRD before creating custom resource instances [OK]
Common Mistakes:
- Assuming resource creates without CRD
- Thinking resource defaults to Pod type
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