How to upgrade StatefulSet in Kubernetes( spec: Forbidden: updates to statefulset spec for fields … )
What is a StatefulSet?
In Kubernetes, StatefulSets are a workload API object used to manage stateful applications. Unlike stateless applications, which can be easily replicated and scaled horizontally, stateful applications maintain critical state information, such as databases or key-value stores. StatefulSets provide guarantees about the ordering and uniqueness of these instances during deployment, scaling, and deletion.
Key Features of StatefulSets:
- Stable Network Identifiers: Each Pod in a StatefulSet receives a stable network identity, allowing other Pods and services to discover and communicate with it reliably.
- Ordered Deployment and Scaling: StatefulSets maintain a consistent, predictable order during deployment and scaling operations, ensuring that Pods are instantiated and terminated sequentially.
- Persistent Storage: StatefulSets integrate seamlessly with PersistentVolumes (PVs) and PersistentVolumeClaims (PVCs), allowing stateful applications to store data persistently across Pod restarts and rescheduling.
- Headless Service: By default, StatefulSets are associated with a headless service, which means that…
