MySQL Daemon failed to start-优快云博客

本文详细解析了MySQL启动过程中遇到的/tmp目录权限问题，提供了通过修改权限和检查数据库用户来解决的方法，并强调了查看日志文件的重要性。此外，文章还总结了常见错误和解决方案，确保MySQL服务能够顺利启动。

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1 》查看原因

[root@localhost mysql]# tail -n 20 /var/log/mysqld.log

120308 12:29:01 [Note] /usr/libexec/mysqld: Shutdown complete

120308 12:29:01 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
120308 12:36:46 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
120308 12:36:46 [Note] Plugin 'FEDERATED' is disabled.
120308 12:36:46 InnoDB: The InnoDB memory heap is disabled
120308 12:36:46 InnoDB: Mutexes and rw_locks use InnoDB's own implementation
120308 12:36:46 InnoDB: Compressed tables use zlib 1.2.3
120308 12:36:46 InnoDB: Using Linux native AIO
/usr/libexec/mysqld: Can't create/write to file '/tmp/ibmedH00' (Errcode: 13)
120308 12:36:46 InnoDB: Error: unable to create temporary file; errno: 13
120308 12:36:46 [ERROR] Plugin 'InnoDB' init function returned error.
120308 12:36:46 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
120308 12:36:46 [ERROR] Unknown/unsupported storage engine: InnoDB
120308 12:36:46 [ERROR] Aborting

120308 12:36:46 [Note] /usr/libexec/mysqld: Shutdown complete

120308 12:36:46 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ende
2》分析 /tmp 目录没有权限：

chmod 777 /tmp

总结：mysql 主义数据库的权限问题：chmod 777 -r /var/lib/mysql;
注意数据库用户：chown -R mysql:mysql /var/lib/mysql
查看log，var/log/mysqld.log