mysql企業備份軟件mysqlbackup啓動鏈接失敗

根據資料上說，mysqlbackup備份數據庫的語法以下：

mysqlbackup -u<user> -p<password>
--backup_dir=<backup-dir>
backup-and-apply-log

具體我執行的時候，總是報錯：

[root@sztech1 ~]# mysqlbackup -u root -p --backup_dir=/backup backup-and-apply-log
MySQL Enterprise Backup version 3.11.0 Linux-3.8.13-16.2.1.el6uek.x86_64-x86_64 [2014/08/26] 
Copyright (c) 2003, 2014, Oracle and/or its affiliates. All Rights Reserved.

mysqlbackup: INFO: Starting with following command line ...
mysqlbackup -u root -p --backup_dir=/backup backup-and-apply-log

mysqlbackup: INFO: 
Enter password: 
141206 01:55:16 mysqlbackup: WARNING: Can not establish connection to mysql server.
Connection open fails with error "Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)"
mysqlbackup: ERROR: Connection initialization error.

mysqlbackup failed with errors!

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