singleton-service.yml

---
apiVersion: v1
kind: Service
metadata:
  name: my-service
spec:
  clusterIP: ""
  ports:
    - name: my-port
      port: 1024
      protocol: TCP
  # NOTE: No selector here! A selector would automatically add all matching and ready pods to the endpoint
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-server-with-replicas
spec:
  replicas: 5
  selector:
    matchLabels:
      app: my-server
  template:
    metadata:
      labels:
        app: my-server
    spec:
      containers:
        - name: my-server
          image: my-server
          args:
            - my-singleton-server
          ports:
            - containerPort: 1024
              name: my-port
          env:
            - name: K8S_AWAIT_ELECTION_ENABLED
              value: "1"
            - name: K8S_AWAIT_ELECTION_NAME
              value: my-server
            - name: K8S_AWAIT_ELECTION_LOCK_NAME
              value: my-server
            - name: K8S_AWAIT_ELECTION_LOCK_NAMESPACE
              value: default
            - name: K8S_AWAIT_ELECTION_IDENTITY
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: K8S_AWAIT_ELECTION_STATUS_ENDPOINT
              value: :9999
            - name: K8S_AWAIT_ELECTION_SERVICE_NAME
              value: my-service
            - name: K8S_AWAIT_ELECTION_SERVICE_NAMESPACE
              value: default
            - name: K8S_AWAIT_ELECTION_SERVICE_PORTS_JSON
              value: '[{"name":"my-port","port":1024}]'
            - name: K8S_AWAIT_ELECTION_POD_IP
              valueFrom:
                fieldRef:
                  fieldPath: status.podIP
            - name: K8S_AWAIT_ELECTION_NODE_NAME
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
---