mysql7 启动报错 Job for mysqld.service failed because the control process exited with error code. See "system 如何解决

引用\[1\]:启动mysql服务报错"Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details." \[1\]引用\[2\]:重启mysql或启动mysql服务时出现相同的报错"Job for mysqld.service failed because the control process exited with error code. See “systemctl status mysqld.service” and “journalctl -xe” for details." \[2\]引用\[3\]:解决方法如下：1. 检查是否存在mysqld文件夹，如果不存在则创建一个mkdir mysqld。2. 将mysqld文件夹授予mysql用户权限，使用命令chown -R mysql:mysql /run/mysqld。3. 再次执行systemctl start mysqld命令启动mysql服务。4. 使用systemctl status mysqld命令查看mysql服务的状态。\[3\]

根据您提供的信息，启动mysql服务时出现了错误。这个错误可能是由于权限问题导致的。您可以按照以下步骤解决这个问题：
1. 首先，检查是否存在mysqld文件夹。如果不存在，可以使用命令mkdir mysqld创建一个。
2. 然后，将mysqld文件夹授予mysql用户权限，使用命令chown -R mysql:mysql /run/mysqld。
3. 最后，再次执行命令systemctl start mysqld启动mysql服务。
4. 您可以使用命令systemctl status mysqld查看mysql服务的状态，确保服务已成功启动。
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