1.当启动MySQL时，报如下错误

[ERROR] Plugin 'InnoDB' init function returned error.
[ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
[ERROR] Unknown/unsupported storage engine: InnoDB

删除MySQL数据目录下的，然后重启MySQL

rm -f ib_logfile*
/etc/init.d/mysqld restart