Centos7安装elasticsearch

一、安装

下载

wget [https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.5.2.tar.gz](https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.5.2.tar.gz)

解压

tar -zvxf elasticsearch-5.5.2.tar.gz -C /usr/local/

因为es不允许在root用户下运行，所以需要创建独立的用户来运行es。创建elasticsearch用户组及elasticsearch用户

groupadd elasticsearch
useradd elasticsearch -g elasticsearch -p elasticsearch

分配权限

chown -R elasticsearch:elasticsearch /usr/local/elasticsearch-5.5.2

切换用户

 su elasticsearch

启动，进入到elasticsearch-5.5.2目录

bin/elasticsearch
bin/elasticsearch -d 后台启动

二、bootstrap checks failed解决方法

1、 错误：max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
查看max_map_count的值

$ cat /proc/sys/vm/max_map_count
65530

重新设置max_map_count的值

$ sysctl -w vm.max_map_count=262144
vm.max_map_count = 262144

永久更改max_map_count值，
vm.max_map_count=200000直接写到/etc/sysctl.conf中,然后执行sysctl -p
2、错误：max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
原因：在Linux的系统中对于进程会有一些限制
切换root用户

vi /etc/security/limits.conf

在文件末尾加入以下代码

elasticsearch soft nofile 65536

elasticsearch hard nofile 131072

elasticsearch soft nproc 2048

elasticsearch hard nproc 4096

重新登录elasticsearch用户

三、安装ik插件

./bin/elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v5.5.2/elasticsearch-analysis-ik-5.5.2.zip