Job for mysqld.service failed because the control process exited with error code.

启动MySQL：

systemctl start mysqld.service

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.

执行：

chmod -R 777 /var/lib/mysql/auto.cnf
chown mysql:mysql /var/lib/mysql -R

然后执行：

systemctl start mysqld.service

启动正常

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