Elasticsearch on kubernetes

es-stateful.yaml

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: elasticsearch
spec:
  selector:
    matchLabels: &POD_LABELS
      app: elasticsearch
  serviceName: elasticsearch
  replicas: 1
  template:
    metadata:
      labels: *POD_LABELS
    spec:
      securityContext:
        # the elasticsearch image runs ES as the elasticsearch user, we need
        # this configuration to ensure the container + volume mount get associated
        # to the same group ID 1000 and the volume is thus writable for elasticsearch
        fsGroup: 1000
      initContainers:
        - name: init-mem-limit
          image: busybox
          # the amount of virtual memory allowed to a vm needs to be bumped up to run ES
          # https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html#docker-cli-run-prod-mode
          command: ['sysctl', '-w', 'vm.max_map_count=262144']
          # need to run this container in privileged mode to allow it to change this setting
          securityContext:
            privileged: true
      containers:
        - name: elasticsearch
          image: docker.elastic.co/elasticsearch/elasticsearch:6.2.3
          ports:
            - containerPort: 9200
          volumeMounts:
            - name: es-data
              mountPath: /usr/share/elasticsearch/data
            - name: es-logs
              mountPath: /usr/share/elasticsearch/logs
  volumeClaimTemplates:
    - metadata:
        name: es-data
      spec:
        accessModes: ['ReadWriteOnce']
        resources:
          requests:
            storage: 50Gi
    - metadata:
        name: es-logs
      spec:
        accessModes: ['ReadWriteOnce']
        resources:
          requests:
            storage: 50Gi
---
apiVersion: v1
kind: Service
metadata:
  name: elasticsearch
  labels:
    app: elasticsearch
spec:
  selector:
    app: elasticsearch
  ports:
    - port: 9200
  # StatefulSet's require a headless service, specified by clusterIP: None
  clusterIP: None