解决ES安装过程中遇到的问题

1、can not run elasticsearch as root

切换到非root用户

2、main ERROR Could not register mbeans java.security.AccessControlException: access denied ("javax.management.MBeanTrustPermission" "register")

改变elasticsearch文件夹所有者到当前用户
sudo chown -R noroot:noroot elasticsearch

3、max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

sudo vi /etc/sysctl.conf
添加下面配置：
vm.max_map_count=655360
并执行命令：
sudo sysctl -p

4、max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]

sudo vi /etc/security/limits.conf
添加如下内容:
* soft nofile 65536
* hard nofile 131072

注意：如果不生效，请重新链接Linux端即可

安装后允许外网访问

vi /{es_home}/config/elasticsearch.yml

#增加（允许外网访问）
network.host: 0.0.0.0
#解决跨域
http.cors.enabled: true
http.cors.allow-origin: "*"