今天為公司新建的uat數據庫備份時，出現了報錯，將解決方法整理、做一下備忘：

服務器系統：

[root@uat-mysql-master tmp]# cat /etc/redhat-release
 CentOS Linux release 7.3.1611 (Core) 
mysql版本號：


報錯如下：
[root@uat-mysql-master tmp]# innobackupex  --defaults-file=/etc/my.cnf --user=backup --password=****** --stream=tar /home/backup/ | gzip >/home/backup/`date +%F_%H-%M-%S`.tar.gz
171120 17:10:42 innobackupex: Starting the backup operation
IMPORTANT: Please check that the backup run completes successfully.
           At the end of a successful backup run innobackupex
           prints "completed OK!".
    171120 17:10:42  version_check Connecting to MySQL server with DSN ‘dbi:mysql:;mysql_read_default_group=xtrabackup‘ as ‘backup‘  (using password: YES).
Failed to connect to MySQL server: DBI connect(‘;mysql_read_default_group=xtrabackup‘,‘backup‘,...) failed: Can‘t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock‘ (2) at - line 1314.
171120 17:10:42 Connecting to MySQL server host: localhost, user: backup, password: set, port: not set, socket: not set
Failed to connect to MySQL server: Can‘t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock‘ (2).

解決辦法：

在命令行中添加

--host=127.0.0.1

參數；

備註：網上有的說，通過

# find / -name "mysql.sock"

查到socket參數，然後在配置文件中修改，但測試後，不一定能解決問題。

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解決xtrabackup備份時出現的socket報錯