Redhat7.2安装yum

一、移除原有的yum

rpm -qa|grep yum|xargs rpm -e --nodeps

二、创建个文件夹存放

#mkdir yum_rpm
#cd yum_rpm

三、下载包

（1）在线

#curl -v 'http://mirrors.163.com/centos/7/os/x86_64/Packages/python-urlgrabber-3.10-10.el7.noarch.rpm' -o python-urlgrabber-3.10-10.el7.noarch.rpm
#curl -v 'http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm' -o yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
#curl -v 'http://mirrors.163.com/centos/7/os/x86_64/Packages/rpm-4.11.3-45.el7.x86_64.rpm' -o rpm-4.11.3-45.el7.x86_64.rpm
#curl -v 'http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm' -o yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm
#curl -v 'http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-168.el7.centos.noarch.rpm' -o yum-3.4.3-168.el7.centos.noarch.rpm
#curl -v 'http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-updateonboot-1.1.31-54.el7_8.noarch.rpm' -o yum-updateonboot-1.1.31-54.el7_8.noarch.rpm

（2）离线下载

http://mirrors.163.com/centos/7/os/x86_64/Packages/python-urlgrabber-3.10-10.el7.noarch.rpm

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

http://mirrors.163.com/centos/7/os/x86_64/Packages/rpm-4.11.3-45.el7.x86_64.rpm

http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm

http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-168.el7.centos.noarch.rpm

http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-updateonboot-1.1.31-54.el7_8.noarch.rpm

下载完后，放到刚刚创建的yum_rpm文件夹下

 

四、安装替换

#cd到yum_rpm文件夹
#rpm -ivh *.rpm --nodeps --force

五、下载CentOS 7的repo文件

 

移走原来的repo
#mv /etc/yum.repos.d/* /tmp

下载Centos-7.repo：
#curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

将CentOS-Base.repo中的$releasever替换为对应版本：
#sed -i "s/\$releasever/7/g" /etc/yum.repos.d/CentOS-Base.repo 

更新yum源
#yum clean all
#yum makecache