今天为公司新建的uat数据库使用XtraBackup备份时，出现了报错，将解决方法整理、做一下备忘：
服务器系统：
[root@uat-mysql-master tmp]# cat /etc/RedHat-release
CentOS Linux release 7.3.1611 (Core)
mysql版本号：
mysql> select version();
----------------
| version() |
----------------
| 5.5.47-cll-lve |
----------------
1 row in set (0.00 sec)
报错如下：
[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).
解决办法：
在命令行中添加
代码语言：javascript复制--host=127.0.0.1参数；
备注：网上有的说，通过
代码语言：javascript复制# find / -name "mysql.sock"查到socket参数，然后在配置文件中修改，但测试后，不一定能解决问题。
