centos8安装镜像安装源、更换yum源
CentOS8通过引导盘+网络镜像镜像源安装系统，设置网络镜像安装源为：mirrors.aliyun.com/centos/8/BaseOS/x86_64/os
镜像下载：https://mirrors.huaweicloud.com/centos-vault/8-stream/isos/x86_64/
CentOS系统换源配置方法
1. 备份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2. 下载新的 CentOS-Base.repo 到 /etc/yum.repos.d/
centos8（centos8官方源已下线，建议切换centos-vault源）wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
CentOS 7方法
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repowget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo常见问题
非阿里云ECS用户会出现 Couldn't resolve host 'mirrors.cloud.aliyuncs.com' 信息，不影响使用。用户也可自行修改相关配置:
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
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