1 运行恢复命令 

[xxx@xxx-c001db1 tmp]$ time /usr/bin/innobackupex --rsync --user="user" --password="#xxx$" /mysqldata/shared/backup 

sys     0m0.124s

mysql    26087 26086  0 04:32 pts/3    00:00:00 -bash

2  去check 配置文件有无datadir配置參数。
[xxx@xxx-c001db1 sharding_setup_1]$ cat /xxx/xxx/xxx/5.5.25a/my.cnf |grep datadir
datadir=/mysqldata/data

看起来my.cnf里面已经配置了。

3  自己定义备份制定my.cnf，试下看。

[xxx@xxx-c001db1 backup]$ time /usr/bin/innobackupex --rsync --user="user" --password="#xxx$" --defaults-file=/opt/xxx/xxx/5.5.25a/my.cnf  /mysqldata/backup


InnoDB Backup Utility v1.5.1-xtrabackup; Copyright 2003, 2009 Innobase Oy
and Percona Inc 2009-2012.  All Rights Reserved.


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


131023 06:33:41  innobackupex: Starting mysql with options:  --defaults-file=‘/opt/xxx/xxx/5.5.25a/my.cnf‘ --password=xxxxxxxx --user=‘user‘ --unbuffered --
131023 06:33:41  innobackupex: Connected to database with mysql child process (pid=22321)
131023 06:33:47  innobackupex: Connection to database server closed
IMPORTANT: Please check that the backup run completes successfully.
           At the end of a successful backup run innobackupex
           prints "completed OK!".


innobackupex: Using mysql  Ver 14.14 Distrib 5.5.25a, for Linux (x86_64) using readline 5.1
innobackupex: Using mysql server version Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.


innobackupex: Created backup directory /mysqldata/shared/backup/2013-10-23_06-33-47
131023 06:33:47  innobackupex: Starting mysql with options:  --defaults-file=‘/opt/xxx/xxx/5.5.25a/my.cnf‘ --password=xxxxxxxx --user=‘user‘ --unbuffered --
131023 06:33:47  innobackupex: Connected to database with mysql child process (pid=22358)
131023 06:33:49  innobackupex: Connection to database server closed


131023 06:33:49  innobackupex: Starting ibbackup with command: xtrabackup_55  --defaults-file="/opt/xxx/xxx/5.5.25a/my.cnf" --backup --suspend-at-end --target-dir=/mysqldata/shared/backup/2013-10-23_06-33-47
innobackupex: Waiting for ibbackup (pid=22419) to suspend
innobackupex: Suspend file ‘/mysqldata/shared/backup/2013-10-23_06-33-47/xtrabackup_suspended‘


xtrabackup_55 version 2.0.0 for Percona Server 5.5.16 Linux (x86_64) (revision id: 417)
xtrabackup: uses posix_fadvise().
xtrabackup: cd to /mysqldata/data
xtrabackup: Target instance is assumed as followings.
xtrabackup:   innodb_data_home_dir = /mysqldata/data
xtrabackup:   innodb_data_file_path = ibdata01:1G:autoextend
xtrabackup:   innodb_log_group_home_dir = /mysqldata/iblogs
xtrabackup:   innodb_log_files_in_group = 2
xtrabackup:   innodb_log_file_size = 1073741824
131023  6:33:49 InnoDB: Using Linux native AIO
xtrabackup: using O_DIRECT
131023  6:33:49  InnoDB: Warning: allocated tablespace 68, old maximum was 9
>> log scanned up to (450994458760)
[01] Copying /mysqldata/data/ibdata01 to /mysqldata/shared/backup/2013-10-23_06-33-47/ibdata01
>> log scanned up to (450994626288)
>> log scanned up to (450994768050)
[01]        ...done
[01] Copying ./billing/enum_invoice_tax_status.ibd to /mysqldata/shared/backup/2013-10-23_06-33-47/./xxx/xxxxtb.ibd
[01]        ...done