Failed to connect to MySQL server to detect version.

用xtrabackup进行数据备份恢复时出现如下问题：

InnoDB Backup Utility v1.5.1-xtrabackup; Copyright 2003, 2009 Innobase Oy

and Percona Inc 2009-2011.  All Rights Reserved.

This software is published under

the GNU GENERAL PUBLIC LICENSE Version 2, June 1991.

option_ibbackup_binary is autodetect, trying to connect to MySQL

Connected to MySQL with pid 6358

You must set xtrabackup version to use with --ibbackup option.

Possible values are xtrabackup_51 (for MySQL 5.0 and 5.1) or xtrabackup (for MySQL 5.1 with InnoDB plugin or Percona Server)

原因：

Xtrabackup是一个对InnoDB做数据备份的工具

解决：

1. 使用其它备份方式。如mysqldump
2. 修改数据库引擎。。。（推荐），，尽量使用InnoDB引擎。

查看数据引擎：

show crate table table_test;

修改数据引擎：

alter table table_name engine=innodb;

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