第一步：安装xtrabackup的数据库
yum install https://www.percona.com/redir/downloads/percona-release/redhat/latest/percona-release-0.1-3.noarch.rpm
第二步：找到xtrabackup相关的包文件名
yum list | grep xtrabackup
第三步：安装xtrabackup
yum -y install percona-xtrabackup.x86_64