ElasticSearch安装

学习视频

https://www.bilibili.com/video/BV1iJ411c7Az?from=search&seid=1238705428280301860

1.建立目录

[root@VM_0_7_centos elsearch]# pwd
/usr/local/elsearch

2. 下载安装包到目录

curl -# -O https://mirrors.huaweicloud.com/elasticsearch/7.9.2/elasticsearch-7.9.2-linux-x86_64.tar.gz

3.建立elsearch用户

elsearch  123456

[root@VM_0_7_centos elsearch]# useradd elsearch

4. 将elsearch目录分配elsearch用户权限

[root@VM_0_7_centos elsearch]# chown elsearch:elsearch /usr/local/elsearch/ -R

[root@VM_0_7_centos local]# ll
total 72
drwxr-xr-x.  2 root     root     4096 Sep 24 23:18 bin
drwxr-xr-x   2 elsearch elsearch 4096 Oct 26 21:00 elsearch

5. 切换用户

[root@VM_0_7_centos elsearch]# su - elsearch
Last failed login: Sun Oct 25 09:57:21 CST 2020 from 183.236.102.76 on ssh:notty
There were 44 failed login attempts since the last successful login.
[elsearch@VM_0_7_centos ~]$

6. 解压

[elsearch@VM_0_7_centos elsearch]$ tar -xvf elasticsearch-7.9.2-linux-x86_64.tar.gz

7. 修改配置文件

[elsearch@VM_0_7_centos elsearch]$ vim elasticsearch-7.9.2/config/elasticsearch.yml

cluster.name: cluster-es792
node.name: node-es792
network.host: 0.0.0.0
http.port: 9200
cluster.initial_master_nodes: ["node-es792"]

8. 修改 jvm.option

修改缘由：在ElasticSearch中若是network.host不是 localhost 或者127.0.0.1 就会认为是生产环境，会对环境的要求比较高，咱们的测试环境不必定可以知足，通常状况下 要修改2处配置以下：

8.1 修改jvm启动参数

[elsearch@VM_0_7_centos elsearch]$ vim elasticsearch-7.9.2/config/jvm.options

-Xms128m
-Xmx128m

8.2 一个进程在VMAs(虚拟内存区域)建立内存映射最大数量

使用root 用户 修改 

# vim /etc/sysctl.conf

在最后面加

vm.max_map_count=655360

使配置生效

# sysctl -p

9.启动

./elasticsearch 或者 # ./elasticsearch -d 后台启动

# ./elasticsearch -d

若是出现 java.nio.file.AccessDeniedException 错误

以root身份 从新执行 第4步

10. 验证

[elsearch@VM_0_7_centos bin]$ curl 127.0.0.1:9200
{
  "name" : "node-es792",
  "cluster_name" : "cluster-es792",
  "cluster_uuid" : "mkh08_bXTBSYkWJjIO2MvQ",
  "version" : {
    "number" : "7.9.2",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "d34da0ea4a966c4e49417f2da2f244e3e97b4e6e",
    "build_date" : "2020-09-23T00:45:33.626720Z",
    "build_snapshot" : false,
    "lucene_version" : "8.6.2",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}