https://mirrors.aliyun.com/centos/7.9.2009/os/x86_64/Packages/yum-3.4.3-168.el7.centos.noarch.rpm?spm=a2c6h.13651111.0.0.2f2c2f70uQr2J9&file=yum-3.4.3-168.el7.centos.noarch.rpm
https://mirrors.aliyun.com/centos/7.9.2009/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm?spm=a2c6h.13651111.0.0.2f2c2f70uQr2J9&file=yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm
https://mirrors.aliyun.com/centos/7.9.2009/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm?spm=a2c6h.13651111.0.0.2f2c2f70uQr2J9&file=yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
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1、直接复制到浏览器回车即可保存文件,再通过xftp上传到系统
2、直接使用wget + 以上地址,也可直接下载到所需服务器上。
1、删除系统自带yum软件。
rpm -qa|grep yum|xargs rpm -e --nodeps
2、安装上述三个rpm文件
rpm -ivh rpm*(这三个包在同一目录下且无其他rpm包,否则复制全名)