sts.demo-ordered.yaml

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: demo-ordered
spec:
  serviceName: demo-ordered
  replicas: 3
  selector:
    matchLabels:
      app: demo-ordered
  template:
    metadata:
      labels:
        app: demo-ordered
    spec:
      containers:
      - name: demo-ordered
        image: busybox
        command:
        - sh
        - -c
        - 'touch /tmp/ready; sleep infinity'
        readinessProbe:
          periodSeconds: 1
          failureThreshold: 1
          exec:
            command:
            - sh
            - -c
            - 'test -f /tmp/ready || (echo "not ready, because /tmp/ready is missing" && false)'
      terminationGracePeriodSeconds: 1
---
apiVersion: v1
kind: Service
metadata:
  name: demo-ordered
spec:
  clusterIP: None
  selector:
    app: demo-ordered