k8s部署elasticsearch集群

1、创建yaml文件，这里我就不分开写了

#创建ConfigMap用于挂载配置文件
apiVersion: v1
kind: ConfigMap
metadata:
  name: sirc-elasticsearch-config
  namespace: es
  labels:
    app: elasticsearch
data:             #具体挂载的配置文件
  elasticsearch.yml: |+     
    cluster.name: crawl
    node.name: ${MY_POD_NAME}    #环境变量，通过kubectl explain pod.spec.containers.env.valueFrom.fieldRef获取
    path.data: /usr/share/elasticsearch/data
    path.logs: /usr/share/elasticsearch/logs
    network.host: 0.0.0.0
    http.port: 9200
    transport.tcp.port: 9300
    discovery.zen.ping.unicast.hosts: ["elasticsearch-0.elasticsearch-cluster.es:9300","elasticsearch-1.elasticsearch-cluster.es:9300","elasticsearch-2.elasticsearch-cluster.es:9300"]
    node.master: true
    node.data: true
    http.cors.enabled: true
    http.cors.allow-origin: "*"
    bootstrap.system_call_filter: false
    xpack.security.enabled: false
    indices.fielddata.cache.size: 60%
    indices.queries.cache.size: 40%

#创建StatefulSet，ES属于数据库类型的应用，此类应用适合StatefulSet类型
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: elasticsearch
  namespace: es
spec:
  serviceName: "elasticsearch-cluster"   #填写无头服务的名称
  replicas: 3
  selector: 
    matchLabels: 
      app: elasticsearch
  template:
    metadata:
      labels:
        app: elasticsearch
    spec:
      containers:
      - name: elasticsearch
        image: docker.elastic.co/elasticsearch/elasticsearch:6.0.0
        ports:
        - containerPort: 9200
          name: elasticsearch
        env:
        - name: MY_POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name  #metadata.name获取自己pod名称添加到变量MY_POD_NAME，status.hostIP获取自己ip等等可以自己去百度
        - name: ES_JAVA_OPTS
          value: "-Xms1g -Xmx1g"
        volumeMounts:                           
          - name: elasticsearch-config            #挂载配置
            mountPath: /usr/share/elasticsearch/config/elasticsearch.yml
            subPath: elasticsearch.yml
          - name: es-data                  #挂载数据
            mountPath: /usr/share/elasticsearch/data 
      volumes:
      - name: elasticsearch-config
        configMap:                                #configMap挂载
          name: sirc-elasticsearch-config
  volumeClaimTemplates:                     #这步自动创建pvc，并挂载动态pv
    - metadata:
        name: es-data
      spec:
        accessModes: ["ReadWriteOnce"]
        storageClassName: nfs-boge
        resources:
          requests:
            storage: 5Gi
#创建Service
---
apiVersion: v1
kind: Service
metadata:
  name: elasticsearch-cluster  #无头服务的名称，需要通过这个获取ip，与主机的对应关系
  namespace: es
  labels:
    app: elasticsearch
spec:
  ports:
    - port: 9200
      name: elasticsearch
  clusterIP: None
  selector:
    app: elasticsearch  
---
apiVersion: v1
kind: Service
metadata:
  name: elasticsearch   #service服务的名称，向外暴露端口
  namespace: es
  labels:
    app: elasticsearch
spec:
  ports:
    - port: 9200
      name: elasticsearch
  type: NodePort
  selector:
    app: elasticsearch

2、应用yaml文件

[root@k8s-master1 ~]# kubectl apply -f es.yaml 
configmap/sirc-elasticsearch-config created
statefulset.apps/elasticsearch created
service/elasticsearch-cluster created
service/elasticsearch created

3、验证是否成功

[root@k8s-master1 ~]# kubectl get svc -n es
NAME                    TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)          AGE
elasticsearch           NodePort    10.0.0.251   <none>        9200:31637/TCP   11s
elasticsearch-cluster   ClusterIP   None         <none>        9200/TCP         12s