apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: es
  labels:
    component: elasticsearch
spec:
  serviceName: elasticsearch
  replicas: 3                      #Required number of replicas
  template:
    metadata:
      labels:
        component: elasticsearch
    spec:
      initContainers: #will always initialize before other containers
      - name: init-sysctl
        image: busybox
        imagePullPolicy: IfNotPresent
        command: ["sysctl", "-w", "vm.max_map_count=262144"]
        securityContext:
          privileged: true
      containers:                #specification of normal containers
      - name: es
        securityContext:
          capabilities:
            add:
              - IPC_LOCK
        image: quay.io/pires/docker-elasticsearch-kubernetes:5.6.4  #specifies the image of elasticsearch to install
        env:  #List of variables accepted by ES for configuration
        - name: KUBERNETES_CA_CERTIFICATE_FILE
          value: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
        - name: NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: "CLUSTER_NAME"
          value: "myesdb"
        - name: "DISCOVERY_SERVICE"
          value: "elasticsearch"
        - name: NETWORK_HOST
          value: "_eth0_"
        ports:
        - containerPort: 9200
          name: http
          protocol: TCP
        - containerPort: 9300
          name: transport
          protocol: TCP
        volumeMounts:
        - mountPath: /data
          name: storage
  volumeClaimTemplates:
  - metadata:
      name: storage
    spec:
      storageClassName: gp2
      accessModes: [ ReadWriteOnce ]
      resources:
        requests:
          storage: 1Gi