elaticsearch学习遇到的问题1--Active: failed (Result: exit-code) since...

问题：

systemctl status elasticsearch
Active: failed (Result: exit-code) since Fri 2020-07-10 17:44:56 CST; 10s ago
启动失败
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查看原因：

tail -f /var/log/elasticsearch/elasticsearch.log
[1] bootstrap checks failed
[1]: memory locking requested for elasticsearch process but memory is not locked
 锁定内存失败
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解决方案：

官方解决方案
https://www.elastic.co/guide/en/elasticsearch/reference/6.4/setup-configuration-memory.html
https://www.elastic.co/guide/en/elasticsearch/reference/6.4/setting-system-settings.html#sysconfig
### 修改启动配置文件
cd /etc/elasticsearch/
systemctl edit elasticsearch
### 增加如下参数
[Service]
LimitMEMLOCK=infinity
### 重新启动
systemctl daemon-reload
systemctl restart elasticsearch
systemctl status elasticsearch
Active: active (running) since Fri 2020-07-10 17:46:50 CST; 393ms ago
启动成功
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