针对没有可用的软件源的处理
如果提示404 说明阿里云的那个链接已经失效了 需要更换
方案1: 中科大 vault 源(国内快)
cd /etc/yum.repos.d/
cat > CentOS-Base.repo << 'EOF'
[base]
name=CentOS-7 - Base
baseurl=https://mirrors.ustc.edu.cn/centos-vault/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
[updates]
name=CentOS-7 - Updates
baseurl=https://mirrors.ustc.edu.cn/centos-vault/7.9.2009/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
[extras]
name=CentOS-7 - Extras
baseurl=https://mirrors.ustc.edu.cn/centos-vault/7.9.2009/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
EOF
yum clean all
yum makecache
上面的命令,建议先切换到root模式 sudo -i
直接整体复制后粘贴执行即可,结果如下

方案2: 官方 vault.centos.org(最稳)
cd /etc/yum.repos.d/
# 清空并写入新源
cat > CentOS-Base.repo << 'EOF'
[base]
name=CentOS-7 - Base
baseurl=http://vault.centos.org/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
[updates]
name=CentOS-7 - Updates
baseurl=http://vault.centos.org/7.9.2009/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
[extras]
name=CentOS-7 - Extras
baseurl=http://vault.centos.org/7.9.2009/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
EOF
# 重建缓存
yum clean all
yum makecache
执行结果如下

后面就能使用(安装 Docker 的前置依赖)
yum install -y yum-utils device-mapper-persistent-data lvm2
运行结果如下:

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