Elasticsearch Master Node Deployment and Headless Service

es-master.yml

apiVersion: v1
kind: Namespace
metadata:
  name: elasticsearch
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: es-master
  namespace: elasticsearch
  labels:
    component: elasticsearch
    role: master
spec:
  replicas: 3
  template:
    metadata:
      labels:
        component: elasticsearch
        role: master
    spec:
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 100
            podAffinityTerm:
              labelSelector:
                matchExpressions:
                - key: role
                  operator: In
                  values:
                  - master
              topologyKey: kubernetes.io/hostname
      initContainers:
      - name: init-sysctl
        image: busybox:1.27.2
        command:
        - sysctl
        - -w
        - vm.max_map_count=262144
        securityContext:
          privileged: true
      containers:
      - name: es-master
        image: quay.io/pires/docker-elasticsearch-kubernetes:6.2.4
        env:
        - name: NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: NODE_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: CLUSTER_NAME
          value: my-es
        - name: NUMBER_OF_MASTERS
          value: "2"
        - name: NODE_MASTER
          value: "true"
        - name: NODE_INGEST
          value: "false"
        - name: NODE_DATA
          value: "false"
        - name: HTTP_ENABLE
          value: "false"
        - name: ES_JAVA_OPTS
          value: -Xms256m -Xmx256m
        - name: PROCESSORS
          valueFrom:
            resourceFieldRef:
              resource: limits.cpu
        resources:
          limits:
            cpu: 2
        ports:
        - containerPort: 9300
          name: transport
        volumeMounts:
        - name: storage
          mountPath: /data
      volumes:
          - emptyDir:
              medium: ""
            name: "storage"
---
apiVersion: v1
kind: Service
metadata:
  name: elasticsearch-discovery
  namespace: elasticsearch
  labels:
    component: elasticsearch
    role: master
spec:
  selector:
    component: elasticsearch
    role: master
  ports:
  - name: transport
    port: 9300
    protocol: TCP
  clusterIP: None