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Learn Kubernetes: A Deep Dive

Deploy the StatefulSet

Understand how to deploy StatefulSets in Kubernetes by defining replicas, services, and volume claim templates. Learn how StatefulSets manage ordered pod creation with persistent storage to support stateful applications and how to customize StorageClass settings for your environment.

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Now that we have a StorageClass and a headless Service, we can deploy the StatefulSet.

Example

The following YAML is from the sts.yml file and defines the StatefulSet.

YAML
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: tkb-sts
spec:
  replicas: 3 
  selector:
    matchLabels:
      app: web
  serviceName: "dullahan"
  template:
    metadata:
      labels:
        app: web
    spec:
      terminationGracePeriodSeconds: 10
      containers:
      - name: ctr-web
        image: nginx:latest
        ports:
        - containerPort: 80
          name: web
        volumeMounts:
        - name: webroot
          mountPath: /usr/share/nginx/html
  volumeClaimTemplates:
  - metadata:
      name: webroot
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: "flash"
      resources:
        requests:
          storage: 10Gi

There’s a lot to take in, so let’s go through the important parts.

  • The name of the StatefulSet is tkb-sts and will be used to name all Pods and associated volumes.

  • Kubernetes will read the spec.replicas field and create 3 replicas called tkb-sts-0, ...