stateful-set-example

apiVersion: v1
kind: Service
metadata:
  name: nginx
  namespace: orange
  labels:
    app: nginx
spec:
  ports:
  - port: 80
    name: web
  clusterIP: None
  selector:
    app: nginx
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nginx
  namespace: orange
spec:
  replicas: 2
  serviceName: nginx
  selector:
    matchLabels:
      app: nginx
  volumeClaimTemplates:
    - metadata:
        name: www
      spec:
        storageClassName: k3d
        accessModes:
          - ReadWriteMany
        resources:
          requests:
            storage: 1Gi
  template:
    metadata:
      labels:
        app: nginx
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: app
                    operator: In
                    values:
                      - nginx
              topologyKey: kubernetes.io/hostname
      initContainers:
      - name: git
        image: alpine/git
        command: [ "sh", "-c", "[ -f /www/index.html ] || git clone https://github.com/octocat/Spoon-Knife /www" ]
        volumeMounts:
        - name: www
          mountPath: /www/   
      containers:
      - name: nginx
        image: nginx
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html/