[Solved] Given this YAML snippet for a ConfigMap with immutable: true: apiVersion: v1 kind: ConfigMap metadata: name: example-config immutable: true data: setting:... | Kubernetes

Kubernetes - ConfigMaps

Given this YAML snippet for a ConfigMap with immutable: true:

apiVersion: v1
kind: ConfigMap
metadata:
  name: example-config
immutable: true
data:
  setting: old_value

What happens if you try to update setting to new_value using kubectl apply?

AThe update fails with an error about immutable field

BThe update succeeds and the ConfigMap changes to new_value

CThe ConfigMap is deleted and recreated with new_value

DThe update is ignored silently, keeping old_value

Step-by-Step Solution

Solution:

Step 1: Understand immutable ConfigMap behavior on update
When immutable: true is set, Kubernetes rejects any update to the ConfigMap data.
Step 2: Predict kubectl apply result
Trying to change setting triggers an error indicating the ConfigMap is immutable and cannot be modified.
Final Answer:
The update fails with an error about immutable field -> Option A
Quick Check:
Immutable ConfigMap update = error [OK]

Quick Trick: Immutable ConfigMaps reject updates with error [OK]

Common Mistakes:

Master "ConfigMaps" in Kubernetes

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