买的VPS服务器，CentOS6.3，一键安装的MySQL，版本5.1.61，默认引擎MyISAM，在phpmyadmin里面找不到InnoDB引擎。
自己安装启用InnoDB，InnoDB插件是随mysql软件包一起发布的，设置好加载路径即可。
编辑/etc/my.cnf文件，在[mysqld]下面添加如下内容：
ignore-builtin-innodb plugin-load=innodb=ha_innodb_plugin.so plugin_dir=/usr/local/mysql-5.1.61/lib/mysql/plugin
重启mysql服务：
/etc/init.d/mysqld restart
进入mysql命令行，执行show plugins或者show engines命令，
如果发现InnoDB没有被加载，那么请检查mysql错误日志（由log-error进行配置），比如：
tail -f /usr/local/mysql-5.1.61/var/my.err
出现错误信息：
InnoDB: Error: log file ./ib_logfile0 is of different size 0 5242880 bytes InnoDB: than specified in the .cnf file 0 268435456 bytes! 140207 20:29:25 [ERROR] Plugin 'InnoDB' init function returned error. 140207 20:29:25 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
原因是在my.cnf里面更改了innodb_log_file_size变量的数值，如无必要修改，去掉重启：
mysql> show plugins; +------------+--------+----------------+---------------------+---------+ | Name | Status | Type | Library | License | +------------+--------+----------------+---------------------+---------+ | binlog | ACTIVE | STORAGE ENGINE | NULL | GPL | | CSV | ACTIVE | STORAGE ENGINE | NULL | GPL | | MEMORY | ACTIVE | STORAGE ENGINE | NULL | GPL | | MyISAM | ACTIVE | STORAGE ENGINE | NULL | GPL | | MRG_MYISAM | ACTIVE | STORAGE ENGINE | NULL | GPL | | InnoDB | ACTIVE | STORAGE ENGINE | ha_innodb_plugin.so | GPL | +------------+--------+----------------+---------------------+---------+
参考链接：
http://dev.mysql.com/doc/innodb-plugin/1.0/en/innodb-plugin-installation-dynamic.html