# 9.2.1 Elasticsearch的安装和简单配置

## 安装

### 安装JAVA

* 运维Elasticsearch，需要安装并配置JDK，设置$JAVA\_HOME
* 各个版本对Java的依赖
  * Elasticsearch 5 需要Java8以上的版本
  * Elasticsearch 从6.5开始支持Java11
  * 7.0 开始，内置了Java环境

### 安装Elasticsearch

* 下载二进制文件

> <https://www.elastic.co/cn/downloads/elasticsearch>

![](/files/-Lo4_Z-KCTp95faTX_xx)

安装并运维Elasticsearch

![](/files/-Lo4_Z-SDL11CYF4XheW)

## 配置

### Elasticsearch的文件目录结构

![](/files/-Lo4_Z-YxMbWVLrytaoY)

### JVM配置

* 修改JCM - config/jvm.options
  * 7.3 下载的默认设置是1GB
* 配置的建议
  * Xmx和Xms设置成一样
  * Xmx不要超过机器内存的50%
  * 不要超过30GB

## 运行

### 运行单个实例

```bash
bin/elasticsearch -E node.name=node0 -E node.name=node0 -E cluster.name=geektime -E path.data=node0_data
```

### 运行多个实例

```
bin/elasticsearch -E node.name=node1 -E cluster.name=geektime -E path.data=node1_data -d
bin/elasticsearch -E node.name=node2 -E cluster.name=geektime -E path.data=node2_data -d
bin/elasticsearch -E node.name=node2 -E cluster.name=geektime -E path.data=node2_data -d
```

* 访问 <http://localhost:9200> check cluster health state
* 通过 [http://localhost:9200\_cat/nodes?v](http://localhost/:9200_cat/nodes?v) 查看节点

### 安装与查看插件

```
bin/elasticsearch-plugin install analysis-icu
bin/elasticsearch-plugin list
```

* Elasticsearch提供插件的机制对系统进行扩展
  * Discovery Plugin
  * Analysis Plugin
  * Security Plugin
  * Management Plugin
  * Ingest Plugin
  * Mapper Plugin
  * Backup Plugin


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