CentOS停止维护时间：
CentOS 6 停止维护更新日期2020年11月30日
CentOS 7 停止维护更新日期2024年6月30日
CentOS 8 停止维护更新日期2029年5月31日
可以看到CentOS 6.X系列在2020年11月30日后就停止维护了，目前国内各大开源镜像站都已经失效，但是以下一些还可以用。
解决方案：
1.关闭fastestmirror
sed -i "s/enabled=1/enabled=0/g" /etc/yum/pluginconf.d/fastestmirror.conf
2.备份原Yum源文件
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
3.更换Yum源
3.1 阿里云Vault镜像
curl -o /etc/yum.repos.d/CentOS-Base.repo https://www.xmpan.com/Centos-6-Vault-Aliyun.repo
wget -O /etc/yum.repos.d/CentOS-Base.repo https://static.lty.fun/%E5%85%B6%E4%BB%96%E8%B5%84%E6%BA%90/SourcesList/Centos-6-Vault-Aliyun.repo
3.2 官方Vault源
wget -O /etc/yum.repos.d/CentOS-Base.repo https://static.lty.fun/%E5%85%B6%E4%BB%96%E8%B5%84%E6%BA%90/SourcesList/Centos-6-Vault-Official.repo
4.清理并构建新缓存
yum clean all yum makecache yum repolist
repo具体内容-1：
[base] name=CentOS-6 - Base baseurl=http://mirrors.sohu.com/centos/6/os/$basearch/ gpgcheck=1 gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6 #released updates [update] name=CentOS-6 - Updates baseurl=http://mirrors.sohu.com/centos/6/updates/$basearch/ gpgcheck=1 gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6 #packages used/produced in the build but not released [addons] name=CentOS-6 - Addons baseurl=http://mirrors.sohu.com/centos/6/addons/$basearch/ gpgcheck=1 gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6 #additional packages that may be useful [extras] name=CentOS-6 - Extras baseurl=http://mirrors.sohu.com/centos/6/extras/$basearch/ gpgcheck=1 gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-6 - Plus baseurl=http://mirrors.sohu.com/centos/6/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6 #contrib - packages by Centos Users [contrib] name=CentOS-6 - Contrib baseurl=http://mirrors.sohu.com/centos/6/contrib/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6 #packages in testing [testing] name=CentOS-6 - Testing baseurl=http://mirrors.sohu.com/centos/6/testing/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
repo具体内容-2：
[base] name=CentOS-6.10 - Base - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos-vault/6.10/os/$basearch/ gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6 #released updates [updates] name=CentOS-6.10 - Updates - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos-vault/6.10/updates/$basearch/ gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6 #additional packages that may be useful [extras] name=CentOS-6.10 - Extras - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos-vault/6.10/extras/$basearch/ gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-6.10 - Plus - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos-vault/6.10/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6 #contrib - packages by Centos Users [contrib] name=CentOS-6.10 - Contrib - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos-vault/6.10/contrib/$basearch/ gpgcheck=1 enabled=0
