MySQL Daemon failed to start

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