fabric8/elasticsearch-k8s

fabric8/elasticsearch-k8s镜像说明

镜像概述

fabric8/elasticsearch-k8s是适配Kubernetes环境的Elasticsearch镜像，集成Kubernetes Cloud插件，支持利用K8s API完成Elasticsearch节点的unicast自动发现，方便在K8s集群快速部署和管理Elasticsearch集群。镜像针对不同版本Elasticsearch提供对应插件版本，确保兼容性。

核心功能

1. Kubernetes Pod自动发现：通过K8s API检索集群内Elasticsearch节点，实现自动加入集群。
2. 服务账户认证：支持K8s服务账户（Service Account）认证，无需手动配置凭证。
3. 多节点模式支持：可部署master、data、client三种节点类型，满足集群高可用需求。
4. 路径自定义：支持数据、日志、插件等目录的挂载配置。

使用场景

• 在K8s集群部署高可用Elasticsearch集群，用于日志收集与分析。
• 构建基于Elasticsearch的全文检索服务，支撑业务系统搜索功能。
• 为监控系统提供数据存储与查询能力。

配置说明

以下是Elasticsearch核心配置示例（yaml格式）：

yaml
cloud:
  kubernetes:
    service: ${SERVICE}  # K8s服务名称
    namespace: ${NAMESPACE}  # 命名空间
discovery:
    type: kubernetes  # 使用K8s发现模式

path:
  data: /data/data  # 数据存储路径
  logs: /data/log   # 日志路径
  plugins: /data/plugins  # 插件路径
  work: /data/work   # 工作目录

部署示例

以下是Kubernetes环境中部署Elasticsearch集群的完整示例（包含Service和ReplicationController）：

yaml
kind: "List"
apiVersion: "v1"
items:
- apiVersion: "v1"
  kind: "Service"
  metadata:
    name: "elasticsearch"
  spec:
    ports:
      - port: 9200
        targetPort: "http"
    selector:
      component: "elasticsearch"
      type: "client"
      provider: "fabric8"
    type: "Load***"
- apiVersion: "v1"
  kind: "Service"
  metadata:
    name: "elasticsearch-cluster"
  spec:
    clusterIP: "None"
    ports:
      - port: 9300
        targetPort: 9300
    selector:
      provider: "fabric8"
      component: "elasticsearch"
- apiVersion: "v1"
  kind: "ReplicationController"
  metadata:
    name: "elasticsearch-data"
  spec:
    replicas: 1
    selector:
      component: "elasticsearch"
      type: "data"
      provider: "fabric8"
    template:
      metadata:
        labels:
          component: "elasticsearch"
          type: "data"
          provider: "fabric8"
      spec:
        serviceAccount: elasticsearch
        serviceAccountName: elasticsearch
        containers:
          - env:
              - name: "SERVICE"
                value: "elasticsearch-cluster"
              - name: "KUBERNETES_NAMESPACE"
                valueFrom:
                  fieldRef:
                    fieldPath: "metadata.namespace"
              - name: "NODE_MASTER"
                value: "false"
            image: "fabric8/elasticsearch-k8s:2.0.0"
            name: "elasticsearch"
            ports:
              - containerPort: 9300
                name: "transport"
            volumeMounts:
              - mountPath: "/usr/share/elasticsearch/data"
                name: "elasticsearch-data"
                readOnly: false
        volumes:
          - emptyDir:
              medium: ""
            name: "elasticsearch-data"
- apiVersion: "v1"
  kind: "ReplicationController"
  metadata:
    name: "elasticsearch-master"
  spec:
    replicas: 1
    selector:
      component: "elasticsearch"
      type: "master"
      provider: "fabric8"
    template:
      metadata:
        labels:
          component: "elasticsearch"
          type: "master"
          provider: "fabric8"
      spec:
        serviceAccount: elasticsearch
        serviceAccountName: elasticsearch
        containers:
          - env:
              - name: "SERVICE"
                value: "elasticsearch-cluster"
              - name: "KUBERNETES_NAMESPACE"
                valueFrom:
                  fieldRef:
                    fieldPath: "metadata.namespace"
              - name: "NODE_DATA"
                value: "false"
            image: "fabric8/elasticsearch-k8s:2.0.0"
            name: "elasticsearch"
            ports:
              - containerPort: 9300
                name: "transport"
- apiVersion: "v1"
  kind: "ReplicationController"
  metadata:
    name: "elasticsearch-client"
  spec:
    replicas: 1
    selector:
      component: "elasticsearch"
      type: "client"
      provider: "fabric8"
    template:
      metadata:
        labels:
          component: "elasticsearch"
          type: "client"
          provider: "fabric8"
      spec:
        serviceAccount: elasticsearch
        serviceAccountName: elasticsearch
        containers:
          - env:
              - name: "SERVICE"
                value: "elasticsearch-cluster"
              - name: "KUBERNETES_NAMESPACE"
                valueFrom:
                  fieldRef:
                    fieldPath: "metadata.namespace"
              - name: "NODE_DATA"
                value: "false"
              - name: "NODE_MASTER"
                value: "false"
            image: "fabric8/elasticsearch-k8s:2.0.0"
            name: "elasticsearch"
            ports:
              - containerPort: 9200
                name: "http"
              - containerPort: 9300
                name: "transport"