##############################################################################
# etcd cluster for M3DB placement & topology
# M3DB requires etcd for cluster coordination
##############################################################################

apiVersion: v1
kind: Service
metadata:
  name: etcd
  namespace: m3db
  labels:
    app.kubernetes.io/name: etcd
    app.kubernetes.io/part-of: m3db
spec:
  clusterIP: None
  publishNotReadyAddresses: true
  ports:
    - name: client
      port: 2379
      targetPort: 2379
    - name: peer
      port: 2380
      targetPort: 2380
  selector:
    app.kubernetes.io/name: etcd

---

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: etcd
  namespace: m3db
  labels:
    app.kubernetes.io/name: etcd
    app.kubernetes.io/part-of: m3db
spec:
  serviceName: etcd
  replicas: 3
  podManagementPolicy: Parallel
  selector:
    matchLabels:
      app.kubernetes.io/name: etcd
  template:
    metadata:
      labels:
        app.kubernetes.io/name: etcd
        app.kubernetes.io/part-of: m3db
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: app.kubernetes.io/name
                    operator: In
                    values:
                      - etcd
              topologyKey: kubernetes.io/hostname
      containers:
        - name: etcd
          image: quay.io/coreos/etcd:v3.5.15
          ports:
            - containerPort: 2379
              name: client
            - containerPort: 2380
              name: peer
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
          command:
            - etcd
          args:
            - --name=$(POD_NAME)
            - --listen-peer-urls=http://0.0.0.0:2380
            - --listen-client-urls=http://0.0.0.0:2379
            - --advertise-client-urls=http://$(POD_NAME).etcd.m3db.svc.cluster.local:2379
            - --initial-advertise-peer-urls=http://$(POD_NAME).etcd.m3db.svc.cluster.local:2380
            - --initial-cluster=etcd-0=http://etcd-0.etcd.m3db.svc.cluster.local:2380,etcd-1=http://etcd-1.etcd.m3db.svc.cluster.local:2380,etcd-2=http://etcd-2.etcd.m3db.svc.cluster.local:2380
            - --initial-cluster-state=new
            - --data-dir=/var/lib/etcd/data
            - --auto-compaction-retention=1
          volumeMounts:
            - name: etcd-data
              mountPath: /var/lib/etcd
          resources:
            requests:
              cpu: 200m
              memory: 256Mi
            limits:
              cpu: 500m
              memory: 512Mi
          livenessProbe:
            httpGet:
              path: /health
              port: 2379
            initialDelaySeconds: 15
            periodSeconds: 10
          readinessProbe:
            httpGet:
              path: /health
              port: 2379
            initialDelaySeconds: 5
            periodSeconds: 5
  volumeClaimTemplates:
    - metadata:
        name: etcd-data
      spec:
        storageClassName: vultr-block-storage-m3db
        accessModes: ["ReadWriteOnce"]
        resources:
          requests:
            storage: 10Gi