DevOps · Flashcard
After a rollout every Pod has a new IP. What does a Service add?
- AOne virtual IP and DNS name that always routes to whichever Pods exist now
- BOne fixed IP per Pod, which that Pod keeps across restarts and rescheduling
- COne DNS record per Pod, which the kubelet updates as Pods come and go
- DOne proxy Pod that holds client connections open while the others restart
Why this is the answer
A Service is a stable front door: its ClusterIP and DNS name never change, while the set of Pods behind it is recalculated from a label selector as Pods appear and disappear. Pod IPs themselves are never stable — a restarted Pod gets a new one. Per-Pod DNS exists only for headless Services, and no proxy Pod is created; the routing lives in each node's packet rules.
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