mysql安装完成后不能用命令
systemctl start mysqld #启动
systemctl stop mysqld #停止
解决办法：
find / -name mysql.server
会出现服务路径：
/usr/local/mysql/support-files/mysql.server
然后根据路径启动
/usr/local/mysql/support-files/mysql.server start
Shutting down MySQL.... SUCCESS! 输出这一行，就说明执行成功
/usr/local/mysql/support-files/mysql.server stop
可以关闭成功
/usr/local/mysql/support-files/mysql.server status
查看mysql状态