Error: Failed to connect to MySQL server: DBI connect(';

先看问题：

[root@localhost ~]# innobackupex --user=root --password=131417 /backup

InnoDB Backup Utility v1.5.1-xtrabackup; Copyright 2003, 2009 Innobase Oy
and Percona LLC and/or its affiliates 2009-2013. All Rights Reserved.

This software is published under
the GNU GENERAL PUBLIC LICENSE Version 2, June 1991.

Get the latest version of Percona XtraBackup, documentation, and help resources:
http://www.percona.com/xb/p

150712 22:29:59 innobackupex: Executing a version check against the server...
150712 22:29:59 innobackupex: Connecting to MySQL server with DSN 'dbi:mysql:;mysql_read_default_group=xtrabackup' as 'root' (using password: YES).
innobackupex: got a fatal error with the following stacktrace: at /usr/bin/innobackupex line 3011.
main::mysql_connect('abort_on_error', 1) called at /usr/bin/innobackupex line 1551
innobackupex: Error: Failed to connect to MySQL server: DBI connect(';mysql_read_default_group=xtrabackup','root',...) failed: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) at /usr/bin/innobackupex line 2995.
150712 22:29:59 innobackupex: Connecting to MySQL server with DSN 'dbi:mysql:;mysql_read_default_group=xtrabackup' as 'root' (using password: YES).
innobackupex: got a fatal error with the following stacktrace: at /usr/bin/innobackupex line 3011.
main::mysql_connect('abort_on_error', 1) called at /usr/bin/innobackupex line 1570
innobackupex: Error: Failed to connect to MySQL server: DBI connect(';mysql_read_default_group=xtrabackup','root',...) failed: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) at /usr/bin/innobackupex line 2995.

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由上面可知道，innobackupex是通过socket的方式链接上去的。想办法使它不走socket就可以了。

解决：

 innobackupex -host=192.168.199.147 --user=jsb --password=jsb --defaults-file=/etc/my.cnf /data/backup 

 innobackupex  + -host=本地路径  /data/backup是自己新建的备份露露