## **安装配置JDK8**
Elastic 需要 Java 8 环境。如果你的机器还没安装 Java，必须先安装Java环境。
1. 下载并解压
```
[root@node1 ~]# tar -zxvf jdk-8u112-linux-x64.tar.gz -C /opt
```
2. 编辑环境变量
vi /etc/profile.d/custom.sh
```
[root@cyj ~]# vi /etc/profile.d/custom.sh
[root@cyj ~]# cat /etc/profile.d/custom.sh
#!/bin/bash
#java path
export JAVA_HOME=/opt/jdk1.8.0_112
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$CLASSPATH:$JAVA_HOME/lib
```
3. 生效
```
[root@cyj ~]# source /etc/profile.d/custom.sh
```
4. 查看JDK版本
```
[root@cyj ~]# java -version
java version "1.8.0_112"
Java(TM) SE Runtime Environment (build 1.8.0_112-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.112-b15, mixed mode)
```
## **创建用户**
从5.0开始，ElasticSearch 安全级别提高了，不允许采用root帐号启动，所以我们要添加一个用户。
1. 创建elastic 用户组
```
[root@cyj ~]# groupadd elastic
```
2. 创建用户es
```
[root@cyj ~]# useradd es
[root@cyj ~]# 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.
```
3. 将es用户添加到elastic 组
```
[root@cyj~]# usermod -G bigdata es
```
4. 设置sudo权限
```
[root@cyj~]# visudo
```
找到root ALL=(ALL) ALL一行，添加es用户，如下。
```
## Allow root to run any commands anywhere
root ALL=(ALL) ALL
es ALL=(ALL) ALL
```
5. 切换用户
```
[root@cyj~]# su es
[es@cyj root]$ cd
[es@cyj~]$
```
## **ElasticSearch 6.x 软件包下载**
1. ElasticSearch官网
https://www.elastic.co/cn/downloads
2. 下载ElasticSearch
https://www.elastic.co/downloads/elasticsearch
```
[es@cyj~]$ wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.4.2.tar.gz
```
3. 解压缩
```
[es@cyj~]$ tar -zxvf elasticsearch-6.4.2.tar.gz
```
4. 修改目录权限
更改elasticsearch-6.4.2文件夹以及内部文件的所属用户为es, 用户组组为bigdata，-R表示逐级（N层目录）
```
[es@cyj~]$ sudo chown -R es:elastic /elasticsearch-6.4.2
[es@cyj~]$ ll /elasticsearch-6.4.2
total 220
drwxr-xr-x 2 es bigdata 4096 Jan 6 08:35 bin
drwxr-xr-x 2 es bigdata 75 Dec 17 15:24 config
drwxr-xr-x 2 es bigdata 4096 Dec 17 15:24 lib
-rw-r--r-- 1 es bigdata 11358 Dec 17 15:22 LICENSE.txt
drwxr-xr-x 15 es bigdata 272 Dec 17 15:24 modules
-rw-r--r-- 1 es bigdata 191887 Dec 17 15:24 NOTICE.txt
drwxr-xr-x 2 es bigdata 6 Dec 17 15:24 plugins
-rw-r--r-- 1 es bigdata 9326 Dec 17 15:22 README.textile
```
## **ElasticSearch 配置**
1. 修改elasticsearch.yml文件
```
[es@cyj elasticsearch-6.4.2]$ vi config/elasticsearch.yml
```
修改network.host和http.port（设置ip地址以及端口号）
```
# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: xxx.xxx.xxx.xxx
#
# Set a custom port for HTTP:
#
http.port: 9200
```
2. 修改/etc/sysctl.conf
切换到root用户
```
[root@cyj elasticsearch-6.4.2]# vi /etc/sysctl.conf
```
添加内容如下：
```
vm.max_map_count=262144
```
用命令sysctl -p 生效
```
[root@cyj ~]# sysctl -p
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
vm.max_map_count = 262144
[root@cyj ~]#
```
3. 修改文件/etc/security/limits.conf
```
[root@cyj logs]# vi /etc/security/limits.conf
```
添加如下内容：
```
* hard nofile 65536
* soft nofile 65536
* soft nproc 2048
* hard nproc 4096
# End of file
```
4. ElasticSearch启动与停止
elasticsearch不能直接以root身份启动，必须切换回es用户启动
```
[es@cyj elasticsearch]$ ./bin/elasticsearch
```
注：后台启动加 -d
5. 查询进程
```
[elsearch@cyj elasticsearch]$ lsof -i:9200
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
java 2429 elsearch 196u IPv4 22910313 0t0 TCP 172.16.0.14:wap-wsp (LISTEN)
```
6. 验证
```
[elsearch@cyj elasticsearch]$ curl http://xxxx.xxxx.xxxx.xxx:9200
{
"name" : "master",
"cluster_name" : "jiqun",
"cluster_uuid" : "7b6GqaWyRsS8938Z8F7Exg",
"version" : {
"number" : "6.4.0",
"build_flavor" : "default",
"build_type" : "tar",
"build_hash" : "595516e",
"build_date" : "2018-08-17T23:18:47.308994Z",
"build_snapshot" : false,
"lucene_version" : "7.4.0",
"minimum_wire_compatibility_version" : "5.6.0",
"minimum_index_compatibility_version" : "5.0.0"
},
"tagline" : "You Know, for Search"
}
```
