[Solved] Given this service YAML snippet, what will be the DNS behavior? apiVersion: v1 kind: Service metadata: name:... Given this service YAML snippet, what will be the DNS behavior? | Kubernetes

Kubernetes - Services

Given this service YAML snippet, what will be the DNS behavior?

apiVersion: v1
kind: Service
metadata:
  name: my-headless-service
spec:
  clusterIP: None
  selector:
    app: myapp
  ports:
  - port: 80
    targetPort: 8080

ADNS returns multiple pod IPs matching the selector

BDNS returns a single IP of a load balancer

CDNS returns no IP because clusterIP is None

DDNS returns the external IP of the cluster

Step-by-Step Solution

Solution:

Step 1: Analyze clusterIP: None effect on DNS
With clusterIP set to None, DNS returns the IPs of all pods matching the selector, not a single IP.
Step 2: Understand DNS response for headless services
DNS returns multiple A records, one per pod IP, enabling direct pod access.
Final Answer:
DNS returns multiple pod IPs matching the selector -> Option A
Quick Check:
Headless DNS = multiple pod IPs [OK]

Quick Trick: Headless service DNS returns pod IPs, not one IP [OK]

Common Mistakes:

Thinking DNS returns a load balancer IP
Assuming no IP is returned when clusterIP is None
Confusing external IP with pod IPs

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Given this service YAML snippet, what will be the DNS behavior?

Step 1: Analyze clusterIP: None effect on DNS

Step 2: Understand DNS response for headless services

Final Answer:

Quick Check:

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