[Solved] You applied this YAML but get an error:apiVersion: v1 kind: Service metadata: name: ext spec: type: ExternalName selector: app: web externalName: web.example.comWhat is wrong? | Kubernetes

Kubernetes - Services

You applied this YAML but get an error:

apiVersion: v1
kind: Service
metadata:
  name: ext
spec:
  type: ExternalName
  selector:
    app: web
  externalName: web.example.com

What is wrong?

AExternalName services should not have a selector field

BexternalName must be a cluster IP address

Ctype must be ClusterIP for externalName to work

Dmetadata name cannot be 'ext'

Step-by-Step Solution

Solution:

Step 1: Review ExternalName service spec rules
ExternalName services do not use selectors because they do not route to pods.
Step 2: Identify invalid field usage
Including a selector causes an error as it conflicts with ExternalName semantics.
Final Answer:
ExternalName services should not have a selector field -> Option A
Quick Check:
No selector allowed in ExternalName spec [OK]

Quick Trick: Remove selector from ExternalName service spec [OK]

Common Mistakes:

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