Centos7 安装 ElasticSearch 6.5.4

####1. 安装JDK8
如果已经安装JDK8，请略过此步
- 下载 JRE
oracle官网：
https://www.oracle.com/technetwork/java/javase/downloads/server-jre8-downloads-2133154.html

![es-java.png](http://erica.kkwen.cn/usr/uploads/2019/01/1900826791.png)

- 上传文件至 `/home/java/` 目录下
```bash
[root@ _10_ /home/java]# rz server-jre-8u201-linux-x64.tar.gz
# 注：如果没有 rz 命令需要安装
# yum -y install lrzsz
```
- 解压文件
```bash
[root@ _11_ /home/java]# tar -zxvf server-jre-8u201-linux-x64.tar.gz
```
- 配置环境变量
```bash
[root@ _12_ /home/java]# vim /etc/profile
按下 G 跳到整个文件的末尾，追加下面的内容
#Java Env
export JAVA_HOME=/home/java/jdk1.8.0_201
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
```
- 使配置文件立即生效
```bash
[root@ _13_ /home/java]# . /etc/profile
```
- 查看JDK版本
```bash
[root@ _14_ /home/java]# java -version
openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-b12)
OpenJDK 64-Bit Server VM (build 25.131-b12, mixed mode)
```
####2. 安装ElasticSearch 6.5.4
注意：从5.0开始，ElasticSearch 安全级别提高了，不允许采用root帐号启动，所以需要自行添加一个用户

- 下载
直接去[官网下载](https://www.elastic.co/cn/downloads/elasticsearch "官网下载") 或者 wget
```bash
[root@ _19_ /home/java]# cd /usr/local/
[root@ _20_ /usr/local]# wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.5.4.tar.gz
[root@ _21_ /usr/local]# tar -zxvf elasticsearch-6.5.4.tar.gz
```
- 解压
```bash
[root@ _31_ /usr/local]# tar -zxvf elasticsearch-6.5.4.tar.gz
```
- 添加用户并授权
```bash
[root@ _45_ /usr/local]# groupadd elasticsearch
[root@ _46_ /usr/local]# useradd -g elasticsearch es
[root@ _47_ /usr/local]# passwd es
Changing password for user es.
New password:
BAD PASSWORD: The password is shorter than 8 characters
Retype new password:
passwd: all authentication tokens updated successfully.
[root@ _48_ /usr/local]# chown es:elasticsearch -R /usr/local/elasticsearch-6.5.4
```
- 切换用户es运行
```bash
[root@ _50_ /usr/local]# su - es
[root@ _51_ /usr/local]# elasticsearch-6.5.4/bin/elasticsearch
```
![es-run.png](http://erica.kkwen.cn/usr/uploads/2019/01/2935961260.png)

- 修改配置文件，使用 root 用户修改
```bash
vim /usr/local/elasticsearch-6.5.4/config/elasticsearch.yml
	
	将下面两处注释去掉
	network.host: 192.168.1.50 # 此处为你的服务器IP地址
	http.port: 9200
	
	在文件末尾添加
	http.cors.enabled: true
	http.cors.allow-origin: "*"
```
```
注意：network.host如果设成0.0.0.0让任何人都可以访问。线上服务不要这样设置，要设成具体的 IP
```
```bash
对应问题：[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
vim /etc/security/limits.conf
	在文件末尾添加下面的配置
	es  soft nofile 65536
	es  hard nofile 65536
	es  soft nproc 4096
	es  hard nproc 4096
```
```bash
对应问题：[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
vim /etc/sysctl.conf
	在文件末尾添加
	vm.max_map_count=655360
```
```bash
对应问题：[3]: max number of threads [2048] for user [lishang] likely too low, increase to at least [4096]
vim /etc/security/limits.d/20-nproc.conf
	查看这一行是不是4096，如果是就不变，不是则修改为下面的形式
	*          soft    nproc     4096
```
**特别注意，一般修改配置文件就要重读配置文件才能生效，执行下面的命令**

```bash
	sysctl -p
	```

- 使用es用户重启elasticsearch
```bash
[es@7a ~]$ /usr/local/elasticsearch-6.5.4/bin/elasticsearch
```
- 测试 默认端口是9200
```bash
[root@ _54_ ~]# curl http://localhost:9200
{
  "name" : "-YN__vZ",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "1500i9mHTmWHXgyyi8g-_w",
  "version" : {
    "number" : "6.5.4",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "d2ef93d",
    "build_date" : "2018-12-17T21:17:40.758843Z",
    "build_snapshot" : false,
    "lucene_version" : "7.5.0",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}
```
- 在windows浏览器中访问`192.168.1.50:9200`,Elastic 返回一个 JSON 对象，包含当前节点、集群、版本等信息
![es-win.png](http://erica.kkwen.cn/usr/uploads/2019/01/3809472362.png)

####参考链接
```
https://blog.csdn.net/WYA1993/article/details/86227094
```
####3. 安装中文分词插件
这里使用的是 elasticsearch-analysis-ik，GitHub 链接为：https://github.com/medcl/elasticsearch-analysis-ik，
这里我们使用 Elasticsearch 的另一个命令行工具 elasticsearch-plugin 来安装，这里安装的版本是 6.2.4，请确保和 Elasticsearch 的版本对应起来，命令如下
```bash
[root@ _33_ /usr/local/elasticsearch-6.5.4/bin]# ./elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v6.5.4/elasticsearch-analysis-ik-6.5.4.zip
```

安装之后重新启动 Elasticsearch 就可以了，它会自动加载安装好的插件

Centos7 安装 ElasticSearch 6.5.4

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