Hands-On Microservices with Kubernetes

StatefulSet components

The StatefulSet is comprised of three main parts, as follows:

• StatefulSet metadata and definition: The StatefulSet metadata and definition are pretty similar to a deployment. You have the standard API version, kind, and metadata name; then, spec, which includes a selector for the pods (which must match the pod template selectors that will come next), the number of replicas (just one, in this case), and the major difference compared with a deployment, that is, serviceName:

apiVersion: apps/v1kind: StatefulSetmetadata:  name: user-dbspec:  selector:    matchLabels:      svc: user      app: postgres  replicas: 1  serviceName: user-db

A StatefulSet must have a headless service associated with the StatefulSet to manage the network identity ...