Mastering Kubernetes - Second Edition

The components of StatefulSet

There are several pieces that need to be configured correctly in order to have a working StatefulSet:

• A headless service responsible for managing the network identity of the StatefulSet pods
• The StatefulSet itself with a number of replicas
• Persistent storage provision dynamically or by an administrator

Here is an example of a service called nginx that will be used for a StatefulSet:

apiVersion: v1 
kind: Service 
metadata: 
  name: nginx 
  labels: 
    app: nginx 
spec: 
  ports: 
  - port: 80 
    name: web 
  clusterIP: None 
  selector: 
    app: nginx 

Now, the StatefulSet configuration file will reference the service:

apiVersion: apps/v1 kind: StatefulSet metadata: name: web spec: serviceName: "nginx" replicas: 3 template: metadata: labels: ...