1.安裝依賴包
yum -y install http://www.percona.com/downloads/percona-release/redhat/0.1-4/percona-release-0.1-4.noarch.rpm
如果yum不能直接安裝，可以先把rpm文件下載下來：
wget http://www.percona.com/downloads/percona-release/redhat/0.1-4/percona-release-0.1-4.noarch.rpm
yum -y install percona-release-0.1-4.noarch.rpm
2、測試依賴庫是否安裝成功(可能有點慢)：
yum list | grep percona
看到以下內容的輸出即可確認安裝成功：
3、安裝percona，安裝是如果有什么依賴，先安裝即可；
上傳：wget https://www.percona.com/downloads/XtraBackup/Percona-XtraBackup-2.4.9/binary/redhat/7/x86_64/percona-xtrabackup-24-2.4.9-1.el7.x86_64.rpm
安裝：yum -y install percona-xtrabackup-24-2.4.9-1.el7.x86_64.rpm
4、查看：rpm -ql percona-xtrabackup-24或者xtrabackup --version
5、mysql5.7.20需安裝最新版XtraBackup2.4.9
wget https://www.percona.com/downloads/XtraBackup/Percona-XtraBackup-2.4.9/binary/redhat/7/x86_64/Percona-XtraBackup-2.4.9-ra467167cdd4-el7-x86_64-bundle.tar
tar -xvf Percona-XtraBackup-2.4.9-ra467167cdd4-el7-x86_64-bundle.tar
yum -y install percona-xtrabackup-24-2.4.9-1.el7.x86_64.rpm
參考：https://www.cnblogs.com/linuxk/p/9372990.html