求助大佬,mysql启动失败，报错：Job for mysqld.service failed

Question

本文主要遇到的问题，启动mysql报错：Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.

[root@oldboy ~]# service mysqld start     # 重启
    Redirecting to /bin/systemctl restart mysqld.service
    Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.

百度了好久，经过一系列的重启，修改权限，并不能精准找到错误原因，发现有说磁盘空间不足的、有说需要删除var/lib/mysql，所有文章千篇一律。

然而，无论哪种说法，都没有什么卵用

查看mysql日志:cat /var/log/mysqld.log

提示3306端口被占用了,但是过滤并没有mysql相关进程

[root@oldboy ~]# ps aux | grep mysql
root     25791  0.0  0.0 112812   972 pts/2    R+   18:29   0:00 grep --color=auto mysql

修改配置文件后，依旧重启报错

[root@oldboy etc]# systemctl restart mysqld
Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.
[root@oldboy etc]# systemctl restart mysql
Failed to restart mysql.service: Unit not found.

烦请路过的大佬帮忙看看，感谢万分！！！

Answer 1

netstat -an | grep 3306

kill 掉进程，或者 MySQL换个端口号