Mysql5.6安装失败

mysql5.6安装好后，重启：

# service mysqld start
MySQL Daemon failed to start.
Starting mysqld:  [FAILED]

通过日志查看错误：

# less /var/log/mysqld.log

.......................

2016-11-04 14:32:29 21288 [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!
2016-11-04 14:32:29 21288 [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!
2016-11-04 14:32:29 21288 [ERROR] Plugin 'InnoDB' init function returned error.
2016-11-04 14:32:29 21288 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2016-11-04 14:32:29 21288 [ERROR] Unknown/unsupported storage engine: InnoDB
2016-11-04 14:32:29 21288 [ERROR] Aborting

.......................

解决办法：

检查发现mysql的目录下有如下文件：

# cd /var/lib/mysql

发现目录下面有这三个文件：ibdata1  ib_logfile0  ib_logfile1

删除了如下三个文件：

# rm -rf ibdata1 ib_logfile0 ib_logfile1

然后重启mysql

# service mysqld start
Starting mysqld:  [  OK  ]

最后

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