redhet7.6配置centos7.2 yum源、epel源

查看redhet系統版本：cat /etc/redhat-release

配置yum源
查看是否有： rpm -qa |grep yum
有則刪除：rpm -qa |grep yum | xargs rpm -e --nodeps
再次檢查確認：rpm -qa |grep yum，返回空
確保 /etc/yum.repo.d/文件夾清空

聯網環境：
下載yum源依賴包
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
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-3.4.3-161.el7.centos.noarch.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-50.el7.noarch.rpm

安裝：
rpm -ivh yum*
rpm -ivh python-iniparse-0.4-9.el7.noarch.rpm

修改yum倉庫：
cd /etc/yum.repos.d/ #進入/etc/yum.repos.d/目錄

下載repo:
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos7_base.repo

創建緩存：
yum clean all
yum makecache

更新：
yum update -y

下載epel:
wget -O /etc/yum.repos.d/epel.repo http://mirrors.cloud.tencent.com/repo/epel-7.repo
yum clean all
yum makecache