apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: etcd
  namespace: coredns
  labels:
    app.kubernetes.io/name: etcd
    app.kubernetes.io/component: dns-backend
spec:
  serviceName: etcd
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: etcd
  template:
    metadata:
      labels:
        app.kubernetes.io/name: etcd
    spec:
      containers:
        - name: etcd
          image: quay.io/coreos/etcd:v3.5.17
          ports:
            - containerPort: 2379
              name: client
            - containerPort: 2380
              name: peer
          env:
            - name: ETCD_DATA_DIR
              value: /etcd-data
            - name: ETCD_LISTEN_CLIENT_URLS
              value: http://0.0.0.0:2379
            - name: ETCD_ADVERTISE_CLIENT_URLS
              value: http://etcd.coredns.svc.cluster.local:2379
            - name: ETCD_LISTEN_PEER_URLS
              value: http://0.0.0.0:2380
            - name: ETCD_INITIAL_ADVERTISE_PEER_URLS
              value: http://etcd-0.etcd.coredns.svc.cluster.local:2380
            - name: ETCD_INITIAL_CLUSTER
              value: etcd-0=http://etcd-0.etcd.coredns.svc.cluster.local:2380
            - name: ETCD_NAME
              value: etcd-0
          resources:
            limits:
              cpu: 100m
              memory: 128Mi
            requests:
              cpu: 50m
              memory: 64Mi
          volumeMounts:
            - name: etcd-data
              mountPath: /etcd-data
  volumeClaimTemplates:
    - metadata:
        name: etcd-data
      spec:
        accessModes: ["ReadWriteOnce"]
        resources:
          requests:
            storage: 1Gi
---
apiVersion: v1
kind: Service
metadata:
  name: etcd
  namespace: coredns
  labels:
    app.kubernetes.io/name: etcd
spec:
  type: ClusterIP
  ports:
    - port: 2379
      targetPort: 2379
      name: client
    - port: 2380
      targetPort: 2380
      name: peer
  selector:
    app.kubernetes.io/name: etcd