RedHat Enterprise7 修改为CentOS的yum源

报错

解决

1、将自带的yum卸载掉

2、下载centos的yum并安装

wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm

wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-52.el7.noarch.rpm

wget http://rpmfind.net/linux/centos/7.7.1908/os/x86_64/Packages/yum-3.4.3-163.el7.centos.noarch.rpm

注：如提示缺哪个包再单独安装哪个

[root@rac2 yum.repos.d]# pwd

/etc/yum.repos.d

[root@rac2 yum.repos.d]# mv public-yum-ol7.repo{,.bak}

释上图：如gpgcheck=0时，gpgkey可不写

[root@rac2 yum.repos.d]# mount /dev/sr0 /mnt/usb1

3、清除yum缓存并重建

4、yum安装测试