引用
在搭建新的服务器时，发现了一个报错
根据内容得知，现在用的镜像已经停止维护了，只能更换归档镜像了
更换镜像
首先先备份原文件
sudo mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup然后打开文件，把里面内容清空，替换下面的内容
# CentOS-Base.repo
[base]
name=CentOS-$releasever - Base - Tsinghua University Mirror (Vault)
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos-vault/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
[updates]
name=CentOS-$releasever - Updates - Tsinghua University Mirror (Vault)
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos-vault/7.9.2009/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
[extras]
name=CentOS-$releasever - Extras - Tsinghua University Mirror (Vault)
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos-vault/7.9.2009/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
[centos-sclo-rh]
name=CentOS-$releasever - SCLo rh - Tsinghua University Mirror (Vault)
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos-vault/7.9.2009/sclo/x86_64/rh/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
[centos-sclo-sclo]
name=CentOS-$releasever - SCLo sclo - Tsinghua University Mirror (Vault)
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos-vault/7.9.2009/sclo/x86_64/sclo/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7然后保存，保存后执行下面命令刷新
sudo yum clean allsudo yum makecache