title: Can't start mysqld after installing MySQL 5.6 in EC2 running Redhat 6.5
body: <p>From Amazon EC2 instance, I have removed the default MySQL 5.1 and installed MySQL 5.6 following the instructions from:</p>
  
  <p><a href="http://sharadchhetri.com/2013/12/26/install-mysql-server-5-6-in-centos-6-x-and-red-hat-6-x-linux/" rel="nofollow">http://sharadchhetri.com/2013/12/26/install-mysql-server-5-6-in-centos-6-x-and-red-hat-6-x-linux/</a></p>
  
  <p>Although it is installed, can't start mysqld, here is the log file:</p>
  
  <pre><code>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
  </code></pre>
  
  <p>What's the step to solve this issue? Thank you.</p>