StatefulSets in Kubernetes are specifically designed for managing stateful applications that require stable, persistent storage and unique network identities. Here are the key scenarios and use cases where you should use a StatefulSet:
1. Stateful Applications
StatefulSets are ideal for applications that need to maintain state across pod restarts and rescheduling. Examples include databases (e.g., MySQL, PostgreSQL), key-value stores (e.g., Redis, etcd), and messaging queues (e.g., RabbitMQ) [1][3][4][6].
2. Stable, Unique Network Identifiers
Each pod in a StatefulSet has a unique, stable network identity. This is crucial for applications that require consistent network access, such as leader-election systems or consensus-based systems where each pod must be uniquely identifiable [3][4][7].
3. Persistent Storage
StatefulSets manage the deployment and scaling of a set of pods while maintaining the persistent storage associated with each pod. This ensures that even if a pod is rescheduled to a different node, it retains its storage, which is essential for data integrity and persistence [1][3][4][7].
4. Ordered, Graceful Deployment and Scaling
StatefulSets ensure that pods are created, updated, and deleted in a strict, ordered manner based on their ordinal index. This ordered deployment and scaling are important for app...
