（1）
下载xtrabackup wget https://www.percona.com/downloads/XtraBackup/Percona-XtraBackup-2.2.11/binary/redhat/6/x86_64/percona-xtrabackup-2.2.11-1.el6.x86_64.rpm
（2）rpm安装xtrabackup rpm -ivh percona-xtrabackup-2.2.11-1.el6.x86_64.rpm 失败 原因：需要先安装 perl
（3）安装perl yum -y install perl perl-devel libaio libaio-devel perl-Time-HiRes perl-DBD-MySQL 失败
原因：yum perl 默认是安装
mysql-libs-5.1.73-5.el6_6.x86_64 和当前已安装的 server 的 MySQL-server-5.6.25-1.el6.x86_64 有冲突，因此需要先安装shared版本。
（4）下载安装mysql-shared wget http://cdn.mysql.com/archives/mysql-5.6/MySQL-shared-5.6.15-1.el6.x86_64.rpm rpm -ih MySQL-shared-5.6.15-1.el6.x86_64.rpm
（5）下载安装 mysql-shared-compat wget http://cdn.mysql.com/archives/mysql-5.6/MySQL-shared-compat-5.6.15-1.el6.x86_64.rpm
rpm -ih MySQL-shared-compat-5.6.15-1.el6.x86_64.rpm
（6）重新安装perl yum -y install perl perl-devel libaio libaio-devel perl-Time-HiRes perl-DBD-MySQL 成功
（7）重新安装 xtrabackup rpm -ivh percona-xtrabackup-2.2.11-1.el6.x86_64.rpm 成功
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