Elasticsearch之kubernetes集群搭建

1、需求

• nfs挂载
• es-ik-pinyin
• max virtual memroy areas vm.max_map_count [65530] is too low,increase to at least [262144]
• sysctl:setting key "vm.max_map_count':Read-only file system

2、nfs挂载

nfs：network  file  system，网络文件系统，基于RPC实现，基于UDP协议；

ps：文件挂载失败，改为目录挂载，并指定subPath

volumes:
   - name: es6-elasticsearch
      nfs: {server: 10.1.2.*, path: /data/dev/es/6.2.3/elasticsearch-cfg}
***********************************
volumeMounts:
   - {
        name: es6-elasticsearch, 
        subPath: elasticsearch.yml,
        mountPath: /usr/share/elasticsearch/config/elasticsearch.yml
      }

3、initContainer

    初始化容器，即主容器启动之前，会先启动一个或多个容器，且由于一个Pod中的存储共享、网络共享，initContainer产生的数据可以被主容器使用。

initContainers: 
      - name: "sysctl"
        image: "busybox"
        imagePullPolicy: "Always"
        command: ["sysctl", "-w", "vm.max_map_count=262144"]
        securityContext:
          privileged: true

    解决方案2：

    切至root用户，执行

sysctl -w vm.max_map_count=262144

    或者修改/etc/sysctl.conf

vm.max_map_count=262144

4、k8s.Yaml

# image harbor.suiyi.com.cn/component/elasticsearch-ik-pinyin:6.2.3
kind: Deployment
apiVersion: apps/v1
metadata: {name: es6, namespace: dev}
spec:
  replicas: 1
  selector:
    matchLabels: {app: es6}
  template:
    metadata:
      labels: {app: es6}
    spec:
      volumes:
      - name: es6-elasticsearch
        nfs: {server: 10.1.2.*, path: /data/dev/es/6.2.3/elasticsearch-cfg}
      - name: es6-nodes
        nfs: {server: 10.1.2.*, path: /data/dev/es/6.2.3/nodes/}
      - name: es6-logs
        nfs: {server: 10.1.2.*, path: /data/dev/es/6.2.3/logs/}
      - name: es6-ikcustom
        nfs: {server: 10.1.2.*, path: /data/dev/es/6.2.3/analysis-ik-custom/}
      - name: es6-ikcfg
        nfs: {server: 10.1.2.*, path: /data/dev/es/6.2.3/analysis-ik-cfg}
      initContainers: 
      - name: "sysctl"
        image: "busybox"
        imagePullPolicy: "Always"
        command: ["sysctl", "-w", "vm.max_map_count=262144"]
        securityContext:
          privileged: true
      containers:
      - name: es6
        image: jinyidong/es-ik-pinyin:6.2.3
        ports:
        - {containerPort: 9200, protocol: TCP}
        - {containerPort: 9300, protocol: TCP}
        resources: {}
        volumeMounts:
        - {
            name: es6-elasticsearch, 
            subPath: elasticsearch.yml,
            mountPath: /usr/share/elasticsearch/config/elasticsearch.yml
          }
        - {name: es6-nodes, mountPath: /usr/share/elasticsearch/data/nodes/}
        - {name: es6-logs, mountPath: /usr/share/elasticsearch/data/logs/}
        - {name: es6-ikcustom, mountPath: /usr/share/elasticsearch/config/analysis-ik/custom/}
        - {
            name: es6-ikcfg, 
            subPath: IKAnalyzer.cfg.xml,
            mountPath: /usr/share/elasticsearch/config/analysis-ik/IKAnalyzer.cfg.xml
          }
---
kind: Service
apiVersion: v1
metadata:
  name: es6
  namespace: dev
  labels: {app: es6}
spec:
  ports:
  - {name: tcp9200, protocol: TCP, port: 9200, targetPort: 9200, nodePort: 29200}
  - {name: tcp9300, protocol: TCP, port: 9300, targetPort: 9300, nodePort: 29300}
  selector: {app: es6}
  type: NodePort