故障背景：自定义配置文件后
在/etc/Elasticsearch/elasticsearch.yml 这个文件做了如下配置
[root@db01 ~]# grep "^[a-z]" /etc/elasticsearch/elasticsearch.yml
node.name: node-1
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
bootstrap.memory_lock: true
network.host: 10.0.0.51,127.0.0.1
http.port: 9200
重启服务
systemctl restart elasticsearch
发现elasticsearch 未启动
排查过程：
查看elasticsearch日志
cat /var/log/elasticsearch/elasticsearch.log
查看日志发现提示内存锁定失败
tail -f /var/log/elasticsearch/elasticsearch.log [2019-12-04T10:27:42,136][ERROR][o.e.b.Bootstrap ] [node-1] node validation exception [1] bootstrap checks failed [1]: memory locking requested for elasticsearch process but memory is not locked
解决方案:
官方有两种结局方案，这是其中一种
添加新的配置文件信息 systemctl edit elasticsearch [Service] LimitMEMLOCK=infinity 重启服务 systemctl daemon-reload systemctl restart elasticsearch
官方解决方案
https://www.elastic.co/guide/en/elasticsearch/reference/6.6/_memory_lock_check.html
https://www.elastic.co/guide/en/elasticsearch/reference/6.6/_memory_lock_check.html
https://www.elastic.co/guide/en/elasticsearch/reference/6.6/setting-system-settings.html#systemd
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