StatefulSets

StatefulSets allow stateful applications to be managed by a Kubernetes controller. Since pods are stateless, we need a higher level concept to allow us to provide consistent pod naming and storage.

They're ideal for workloads involving storage, such as database and cache servers.

apiVersion: v1
kind: StatefulSet
metadata:
    name: my-statefulset
spec: x

Differences to Deployments

Unlike Deployments, which are designed for deploying stateless applications, StatefulSets assign each pod a "sticky" identity (an ordinal index, starting from zero). This identity persists across rescheduling. The pod's DNS name is derived from this identity.

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Backlinks

• Kubernetes (public)
• Cluster API (public)
• HorizontalPodAutoscaler (public)
• PodDisruptionBudgets (public)