使用ECK搭建Elasticsearch集群

ECK

Elastic Cloud on Kubernetes简称ECK，其扩展了Kubernetes的基本编排功能，以支持Kubernetes上Elasticsearch，Kibana和APM Server的设置和管理。借助ECK可以简化所有关键操作：
1.管理监控多个集群
2.扩展缩小集群
3.变更集群配置
4.调度备份
5.使用TLS证书保护集群
6.采用区域感知实现hot-warm-cold架构

在Kubernetes集群中部署ECK

安装自定义资源定义和操作符及其 RBAC 规则：

kubectl create -f https://download.elastic.co/downloads/eck/1.8.0/crds.yaml
kubectl apply -f https://download.elastic.co/downloads/eck/1.8.0/operator.yaml

部署Elasticsearch

配置StorageClass 使用Ceph作为存储,详细可看Kubernetes集成Ceph rbd文章

apiVersion: elasticsearch.k8s.elastic.co/v1
kind: Elasticsearch
metadata:
  name: elastic-cluster #Cluster name
  namespace: elastic-system
spec:
  version: 7.2.0
  nodeSets:
  - name: master-nodes #node name
    count: 1
    config:
      node.master: true
      node.data: false
    podTemplate:
      spec:
        initContainers:
        - name: sysctl
          securityContext:
            privileged: true
          command: ['sh', '-c', 'sysctl -w vm.max_map_count=262144']
        - name: plugins
          command:
          - sh
          - -c
          - |
            bin/elasticsearch-plugin install --batch http://10.20.20.140/elasticsearch-analysis-ik-7.2.0.zip # 使用initcontainer安装Elasticsearch插件
        containers:
        - name: elasticsearch
          env:
          - name: ES_JAVA_OPTS
            value: -Xms1g -Xmx1g
          resources:
            requests:
              memory: 2Gi
            limits:
              memory: 2Gi
    volumeClaimTemplates:
    - metadata:
        name: elasticsearch-data 
      spec:
        accessModes:
        - ReadWriteOnce
        resources:
          requests:
            storage: 200Gi
        storageClassName: rbd
  - name: data-nodes #node name
    count: 2
    config:
      node.master: false
      node.data: true
    podTemplate:
      spec:
        initContainers:
        - name: sysctl
          securityContext:
            privileged: true
          command: ['sh', '-c', 'sysctl -w vm.max_map_count=262144']
        - name: plugins
          command:
          - sh
          - -c
          - |
            bin/elasticsearch-plugin install --batch http://10.20.20.140/elasticsearch-analysis-ik-7.2.0.zip  # 使用initcontainer安装Elasticsearch插件
        containers:
        - name: elasticsearch
          env:
          - name: ES_JAVA_OPTS
            value: -Xms1g -Xmx1g
          resources:
            requests:
              memory: 2Gi
            limits:
              memory: 2Gi
    volumeClaimTemplates:
    - metadata:
        name: elasticsearch-data
      spec:
        accessModes:
        - ReadWriteOnce
        resources:
          requests:
            storage: 200Gi
        storageClassName: rbd
  http:
    service:
      spec:
        type: NodePort

部署Kibana

apiVersion: kibana.k8s.elastic.co/v1
kind: Kibana
metadata:
  name: elastic-kibana
  namespace: elastic-system
spec:
  version: 7.2.0
  http:
    tls:
      selfSignedCertificate:
        disabled: true
  count: 1
  elasticsearchRef:
    name: elastic-cluster
  podTemplate:
    spec:
      containers:
      - name: kibana
        resources:
          limits:
            cpu: 1000m
          requests:
            cpu: 100m
  http:
    service:
      spec:
        type: NodePort

获取Elastic 用户密码

kubectl get secret elastic-cluster-es-elastic-user -n elastic-system -o=jsonpath='{.data.elastic}' | base64 --decode; echo

测试访问:

curl https://10.240.104.43:9200 -u 'elastic:password' -k