Headless Services and direct Pod DNS
WHAT IT TESTS: Understanding headless Services. OUTLINE: Set clusterIP: None so no virtual IP or proxy load balancing; DNS returns individual Pod IPs (A records). Primary use: StatefulSets needing stable per-Pod addressing.
WHAT IT TESTS: Whether you grasp direct Pod discovery without proxying. ANSWER OUTLINE: A headless Service is created with clusterIP: None, so Kubernetes allocates no virtual IP and kube-proxy does no load balancing. Instead, a DNS lookup of the Service returns the A records of all the backing Pods directly, letting the client choose or discover individual Pods. The primary use case is StatefulSets, where each Pod needs a stable network identity, as with database clusters or peer-to-peer systems.
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- #kubernetes
- #headless-service
- #statefulset
- #dns
- #service-discovery
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