Learn Kubernetes: A Deep Dive/

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Deploy the StatefulSet

Deploy the StatefulSet

Learn how to deploy the StatefulSet.

We'll cover the following...

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.

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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, ...