MySQL中遇见"unauthenticated user"莫惊慌

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MySQL中遇见"unauthenticated user"莫惊慌_MySQL

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Jun 01, 2016 pm 01:51 PM

从昨天开始，我开始对MySQL进行监控，发现时不时的会出现

MySQL中遇见"unauthenticated user"莫惊慌_MySQL

感觉很奇怪，MySQL的配置文件里，配置禁止域名解析了--skip-name-resolve,详情查看mysql是怎样使用dns的，google一翻，有说这是MySQL的一个bug，但是我的数据库版本不在里面说的之列，这篇文章安定了我的心。

“unauthenticated user”的意思是由一个客户端发起的连接，但是这个客户端用户还没有被认证。这种情况一般在系统负载比较高或者mysql比较繁忙的时候遇到。

此外在show processlist里还有几个User用户，比较常见的就不说了

1.system user

它指的是没有客户端线程，由服务派发的处理内部任务的用户。通常是主从数据库中的从库I/O线程或者是SQL线程使用。系统用户有一个明显的标志，Host列没有内容。

2.event_scheduler

指的是监视器事件线程使用的用户。

参考资料：

show-processlist

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