Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

[root@t1 /]#  innobackupex --user=root --password=123456 /mydata/data


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.


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160309 07:01:49  innobackupex: Executing a version check against the server...
160309 07:01:49  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
160309 07:01:49  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
[root@t1 /]# ln -s /tmp/mysql.sock /var/lib/mysql/mysql.sock
ln: creating symbolic link `/var/lib/mysql/mysql.sock': No such file or directory

解决：

[root@t1 /]# mkdir /var/lib/mysql/

[root@t1 /]# ln -s /tmp/mysql.sock /var/lib/mysql/mysql.sock
[root@t1 /]# ln -s /tmp/mysql.sock /var/lib/mysql/mysql.sock