[Solved] Given this ExternalName service YAML:apiVersion: v1 kind: Service metadata: name: ext-service spec: type: ExternalName externalName: api.example.... | Kubernetes

Kubernetes - Services

Given this ExternalName service YAML:

apiVersion: v1
kind: Service
metadata:
  name: ext-service
spec:
  type: ExternalName
  externalName: api.example.com

What happens when a pod inside the cluster runs nslookup ext-service?

AIt returns the cluster IP of ext-service

BIt returns the IP address of the pod running the service

CIt returns an error because ExternalName services have no IP

DIt returns the IP address of api.example.com

Step-by-Step Solution

Solution:

Step 1: Understand DNS resolution for ExternalName
ExternalName services create a DNS CNAME record pointing to the externalName value, so queries resolve to that external DNS.
Step 2: Analyze nslookup behavior
Running nslookup ext-service returns the IP address of api.example.com by resolving the CNAME.
Final Answer:
It returns the IP address of api.example.com -> Option D
Quick Check:
ExternalName DNS = external DNS IP [OK]

Quick Trick: ExternalName returns external DNS IP on lookup [OK]

Common Mistakes:

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