Running stateful apps with StatefulSets
WHAT IT TESTS: stateful workloads in Kubernetes. OUTLINE: stateful apps need stable identity and storage; a StatefulSet gives stable names, ordered rollout, and per-Pod volumes. RED FLAG: claiming a Deployment plus PVC solves it.
WHAT IT TESTS: why stateful workloads need identity and stable storage. ANSWER OUTLINE: a Deployment treats Pods as fungible with random names and shared or no stable storage, fine for stateless apps but wrong for databases where each replica has unique data and a role. A StatefulSet gives each Pod a stable ordinal name and DNS identity, dedicated persistent volumes that survive rescheduling, and ordered creation, scaling, and updates. RED FLAG: saying a Deployment plus a single PVC is equivalent.
Read the original → interview
- #kubernetes
- #statefulset
- #stateful
- #persistent-volume
- #databases
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