安装Elasticsearch出现 node validation exception 的问题处理

es报错如下：

[2019-10-11T16:23:28,945][ERROR][o.e.b.Bootstrap ] [es-node-1] node validation exception[3] bootstrap checks failed

[1]: max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536]
[2]: memory locking requested for elasticsearch process but memory is not locked
[3]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

[1]: max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536]

切换到root用户，编辑limits.conf 添加类似如下内容 

 vi /etc/security/limits.conf 

添加如下内容: (soft nproc和hard nproc也可以设置成65536) 修改成

root soft nofile 65535
root hard nofile 65535
* soft nofile 65536
* hard nofile 65536

* soft nofile 65536

* hard nofile 131072

* soft nproc 2048

* hard nproc 4096

以上几个参数的解释

① soft nproc:可打开的文件描述符的最大数(软限制)

② hard nproc:可打开的文件描述符的最大数(硬限制)

③ soft nofile:单个用户可用的最大进程数量(软限制)

④ hard nofile:单个用户可用的最大进程数量(硬限制)

[2]: memory locking requested for elasticsearch process but memory is not locked

原因：锁定内存失败

解决方案：
切换到root用户，编辑limits.conf配置文件， 添加类似如下内容：

sudo vim /etc/security/limits.conf

添加如下内容:

* soft memlock unlimited
* hard memlock unlimited

备注：* 代表Linux所有用户名称

保存、退出、重新登录才可生效

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

原因：最大虚拟内存太小
解决方案：切换到root用户下，修改配置文件sysctl.conf

sudo vim /etc/sysctl.conf

添加下面配置：

vm.max_map_count=655360

并执行命令：

sysctl -p

参考地址：

https://www.cnblogs.com/DreamDrive/p/7853162.html

https://blog.csdn.net/Hey_WonderfulWorld/article/details/73612929