在运行Redhat 6.5的EC2中安装MySQL 5.6后无法启动mysqld

在Amazon EC2实例中,我已按照以下说明删除了默认的MySQL 5.1并安装了MySQL 5.6:

http://sharadchhetri.com/2013/12/26/install-mysql-server-5-6-in-centos-6-x-and-red-hat-6-x-linux/

虽然它已经安装,无法启动mysqld,这里是日志文件:

140112 23:16:53 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
2014-01-12 23:16:54 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2014-01-12 23:16:54 7601 [Note] Plugin 'FEDERATED' is disabled.
2014-01-12 23:16:54 7601 [Note] InnoDB: The InnoDB memory heap is disabled
2014-01-12 23:16:54 7601 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2014-01-12 23:16:54 7601 [Note] InnoDB: Compressed tables use zlib 1.2.3
2014-01-12 23:16:54 7601 [Note] InnoDB: Using Linux native AIO
2014-01-12 23:16:54 7601 [Note] InnoDB: Not using CPU crc32 instructions
2014-01-12 23:16:54 7601 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2014-01-12 23:16:54 7601 [Note] InnoDB: Completed initialization of buffer pool
2014-01-12 23:16:54 7601 [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!
2014-01-12 23:16:54 7601 [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!
2014-01-12 23:16:54 7601 [ERROR] Plugin 'InnoDB' init function returned error.
2014-01-12 23:16:54 7601 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2014-01-12 23:16:54 7601 [ERROR] Unknown/unsupported storage engine: InnoDB
2014-01-12 23:16:54 7601 [ERROR] Aborting

2014-01-12 23:16:54 7601 [Note] Binlog end
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'partition'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'BLACKHOLE'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'ARCHIVE'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_SYS_FIELDS'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_SYS_INDEXES'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_SYS_TABLES'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_FT_CONFIG'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_FT_DELETED'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_METRICS'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_CMPMEM'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_CMP_RESET'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_CMP'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_LOCK_WAITS'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_LOCKS'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'INNODB_TRX'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'MyISAM'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'MRG_MYISAM'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'CSV'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'MEMORY'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'sha256_password'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'mysql_old_password'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'mysql_native_password'
2014-01-12 23:16:54 7601 [Note] Shutting down plugin 'binlog'
2014-01-12 23:16:54 7601 [Note] /usr/sbin/mysqld: Shutdown complete

解决这个问题的步骤是什么？谢谢.