1. yum 更新
yum update
2. 安装yum 管理工具包
yum install -y yum-utils device-mapper-persistent-data lvm2

3. 配置镜像源
阿里:
yum-config-manager --add-repo http://mirrors.aliyun.com/repo/Centos-7.repo
红帽:
yum-config-manager --add-repo https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
CentOs:
yum-config-manager --add-repo https://centos.pkgs.org/7/centos-x86_64/centos-release-7-8.2003.0.el7.centos.x86_64.rpm
Docker 中央仓库:
yum-config-manager --add-repo http://download.docker.com/linux/centos/docker-ce.repo Docker
阿里仓库:
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
4. 清除缓存
yum clean all
5. 生成缓存
yum makecache
6.查看所有源
yum repolist all
7. 查看可用源
yum repolist enabled
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