https://www.percona.com/downloads/
8.0对应的是mysql的8.0版本，5.x的版本用2.4
[root@localhost ~]#wget https://downloads.percona.com/downloads/Percona-XtraBackup-2.4/Percona-XtraBackup-2.4.18/binary/redhat/7/x86_64/percona-xtrabackup-24-2.4.18-1.el7.x86_64.rpm
[root@localhost ~]# wget http://rpmfind.net/linux/atrpms/el6-x86 64/atrpms/stable/libev-4.04-2.el6.x86 64.rpm
[root@localhost ~]# ls
anaconda-ks.cfg mysql80-community-release-el7-3.noarch.rpm
libev-4.04-2.el6.x86_64.rpm percona-xtrabackup-24-2.4.18-1.el7.x86_64.rpm
[root@localhost ~]# yum localinstall libev-4.04-2.el6.x86_64.rpm
[root@localhost ~]# yum install -y percona-xtrabackup-24-2.4.18-1.el7.x86_64.rpm