[Solved] You have this environment variable setup in a pod spec:- name: FEATURE_Z_ENABLED valueFrom: configMapKeyRef: name: feature-flags key:... | Kubernetes

Kubernetes - Advanced Deployment Patterns

You have this environment variable setup in a pod spec:

- name: FEATURE_Z_ENABLED
  valueFrom:
    configMapKeyRef:
      name: feature-flags
      key: FEATURE_Z_ENABLED

If the ConfigMap 'feature-flags' does not have the key FEATURE_Z_ENABLED, what will happen when the pod starts?

APod will fail to start with an error

BPod will start with FEATURE_Z_ENABLED set to an empty string

CPod will start with FEATURE_Z_ENABLED set to null

DPod will ignore the environment variable

Step-by-Step Solution

Solution:

Step 1: Understand configMapKeyRef behavior
If the specified key is missing in the ConfigMap, Kubernetes treats it as an error.
Step 2: Effect on pod startup
The pod will fail to start because the environment variable cannot be resolved from the ConfigMap key.
Final Answer:
Pod will fail to start with an error -> Option A
Quick Check:
Missing ConfigMap key causes pod start failure [OK]

Quick Trick: Missing ConfigMap key breaks pod start [OK]

Common Mistakes:

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You have this environment variable setup in a pod spec: