1 环境：ubuntu
2 问题描述：
停止mysql服务，输入命令:
service mysqld stop
出现如下报错：
root@iZ2ze8qk0tdrzqj7sd1kZ:/usr/bin# service mysqld stop
Failed to stop mysqld.service: Unit mysqld.service not loaded.
3 解决：
输入命令：
systemctl enable mysql.service
执行结果：
root@iZ2ze8qk0tdrzqj7sd1kZ:~# systemctl enable mysql.service
Synchronizing state of mysql.service with SysV init with /lib/systemd/systemd-sysv-install...
Executing /lib/systemd/systemd-sysv-install enable mysql
insserv: can not symlink(../init.d/aegis, ../rc2.d/S02aegis): File exists
insserv: can not symlink(../init.d/aegis, ../rc3.d/S02aegis): File exists
insserv: can not symlink(../init.d/aegis, ../rc4.d/S02aegis): File exists
insserv: can not symlink(../init.d/aegis, ../rc5.d/S02aegis): File exists
停止mysql服务，再次输入命令：
systemctl stop mysql
4 验证：
查询mysql进程，输入命令：
ps -aux|grep mysql
执行结果：文章来源：https://www.toymoban.com/news/detail-575381.html
root@iZ2ze8qk0tdrzqj7sd1kZ:~# ps -aux|grep mysql
root 4765 0.0 0.0 14224 1088 pts/0 S+ 15:20 0:00 grep --color=auto mysql
没有mysql进程，说明mysql已经关闭。文章来源地址https://www.toymoban.com/news/detail-575381.html
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