将RHEL7.5的yum修改为centos的163源

RHEL的yum是要给钱才能用的，想要不给钱的用，就把原装yum替换为centos的yum

1.查看原有yum包

rpm -qa|grep yum

yum-langpacks-0.4.2-7.el7.noarch
yum-Metadata-parser-1.1.4-10.el7.x86_64
yum-rhn-plugin-2.0.1-10.el7.noarch
yum-3.4.3-158.el7.noarch
PackageKit-yum-1.1.5-1.el7.x86_64
yum-utils-1.1.31-45.el7.noarch

2.卸载原yum包

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

3.创建下载路径,下载centos7.5 yum包

mkdir /tmp/pkg && cd /tmp/pkg

wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/yum-3.4.3-158.el7.centos.noarch.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/yum-Metadata-parser-1.1.4-10.el7.x86_64.rpm

wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-45.el7.noarch.rpm

4.安装

rpm -ivh yum-*

5.替换原源

cd /etc/yum.repos.d/ && rm -rfv *

6.下载163源

wget http://mirrors.163.com/.help/CentOS7-Base-163.repo

7.将下载好的文件中的 $releasever 全部修改为目标版本 7.5.1804

8.重建缓存

yum clean all && yum makecache

yum repolist all