StatefulSet
A StatefulSet is a Kubernetes workload resource that manages stateful Pods with stable identities, ordered operations, and persistent storage associations.
Kubernetes in Action, Second Edition
A StatefulSet is a Kubernetes resource that manages stateful pods with stable identities and ordered deployment or scaling.
- How it is used
- Manages stateful application replicas whose individual identities, storage, and network names must persist across pod replacement.
- How deep it goes
- Works through creation, inspection, replacement, node failure, and update procedures, while leaving fuller stateful-workload automation to Operators.
- Examples
- Uses a three-replica quiz application with MongoDB, kubectl inspection, pod deletion, node failure, and a partitioned canary rollout.
- What you can do after
- Operate/configure it with manifests and kubectl to inspect replicas, preserve pod identity, and stage updates.
Read how Kubernetes in Action, Second Edition explains StatefulSet →
Road to Kubernetes
A StatefulSet is a Kubernetes workload resource that manages stateful Pods with stable identities, ordered deployment, and persistent storage associations.
- How it is used
- Manages stateful Pod replicas, particularly data stores that need a separate storage volume for each replica.
- How deep it goes
- Works through a PostgreSQL manifest and its storage, initialization, and access configuration, but leaves database clustering outside scope.
- Examples
- Uses a PostgreSQL StatefulSet with a 20Gi volume claim template, Secret-backed settings, and a ClusterIP Service.
- What you can do after
- Build it from scratch as a PostgreSQL StatefulSet with per-replica storage and internal service access.
Kubernetes for Developers
A StatefulSet is a Kubernetes workload resource that manages stateful Pods with stable identities and persistent storage associations.
- How it is used
- Manages multi-Pod stateful services when each Pod needs its own disk and stable identity.
- How deep it goes
- Explains volume templates, PVCs, ordinals, and ordering through a configured Redis deployment, then addresses disk recovery.
- Examples
- Uses a three-Pod Redis primary-and-replica configuration, read/write checks, and a retained-disk recovery exercise.
- What you can do after
- Build it from scratch as a multirole Redis StatefulSet and recover its data by retaining and relinking disk resources.
Google Anthos in Action
A Kubernetes StatefulSet is a resource that manages replicated pods with stable identities and persistent storage associations.
- How it is used
- Deploys migrated stateful applications whose Pods require durable storage associations.
- How deep it goes
- Explains the StatefulSet’s YAML role and surrounding storage resources but does not detail identity or update mechanics.
- Examples
- Uses a Migrate for Anthos deployment specification containing a migrated VM image, storage resources, Service, and logging configuration.
- What you can do after
- Evaluate how a Kubernetes deployment specification represents a stateful application and its durable storage requirements.
Related concepts
- Kubernetes controllercontrasts with · A Kubernetes controller is a control-loop component that observes resource state and takes action to move actual state toward desired state.
- persistent volume claimproduces · A PersistentVolumeClaim is a Kubernetes resource through which a workload requests persistent storage with specified capacity, access modes, and other storage characteristics.
- volume claim templatehas part · A volume claim template is a Kubernetes StatefulSet template from which Kubernetes creates a PersistentVolumeClaim for each replicated Pod.
- statefulnessimplements · Statefulness is the property of a system or operation whose behavior or results depend on information retained or changed across interactions or executions.
- pod management policyconfigured by · A pod management policy is a StatefulSet setting that controls whether pods are created sequentially or concurrently during management operations.
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