oel5.5安装mysql数据库初始化报错解决办法

[root@chavinking mysql]# scripts/mysql_install_db --user=mysql
Installing MySQL system tables...2016-12-02 00:05:00 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2016-12-02 00:05:00 0 [Note] ./bin/mysqld (mysqld 5.6.24) starting as process 3711 ...
2016-12-02 00:05:00 3711 [Note] InnoDB: Using atomics to ref count buffer pool pages
2016-12-02 00:05:00 3711 [Note] InnoDB: The InnoDB memory heap is disabled
2016-12-02 00:05:00 3711 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2016-12-02 00:05:00 3711 [Note] InnoDB: Memory barrier is not used
2016-12-02 00:05:00 3711 [Note] InnoDB: Compressed tables use zlib 1.2.3
2016-12-02 00:05:00 3711 [Note] InnoDB: Using Linux native AIO
2016-12-02 00:05:00 3711 [Note] InnoDB: Not using CPU crc32 instructions
2016-12-02 00:05:00 3711 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2016-12-02 00:05:00 3711 [Note] InnoDB: Completed initialization of buffer pool
2016-12-02 00:05:00 3711 [ERROR] InnoDB: auto-extending data file ./ibdata1 is of a different size 640 pages (rounded down to MB) than specified in the .cnf file: initial 768 pages, max 0 (relevant if non-zero) pages!
2016-12-02 00:05:00 3711 [ERROR] InnoDB: Could not open or create the system tablespace. If you tried to add new data files to the system tablespace, and it failed here, you should now edit innodb_data_file_path in my.cnf back to what it was, and remove the new ibdata files InnoDB created in this failed attempt. InnoDB only wrote those files full of zeros, but did not yet use them in any way. But be careful: do not remove old data files which contain your precious data!
2016-12-02 00:05:00 3711 [ERROR] Plugin 'InnoDB' init function returned error.
2016-12-02 00:05:00 3711 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2016-12-02 00:05:00 3711 [ERROR] Unknown/unsupported storage engine: InnoDB
2016-12-02 00:05:00 3711 [ERROR] Aborting

2016-12-02 00:05:00 3711 [Note] Binlog end
2016-12-02 00:05:00 3711 [Note] ./bin/mysqld: Shutdown complete

[root@chavinking mysql]# ll /etc/my.cnf
-rw-r--r-- 1 root root 441 Feb 17  2010 /etc/my.cnf
[root@chavinking mysql]# mv /etc/my.cnf /etc/my.cnf.bak