今天看到服务器提示有漏洞需要更新，在执行更新命令的时候一直报错，因为CentOS 6操作系统版本结束了生命周期（EOL），Linux社区已不再维护该操作系统版本。导致不能正常更新，接下来吾爱编程为大家介绍一下Centos6 yum源失效解决方法，有需要的小伙伴可以参考一下：
1、背景信息：
2020年12月2日起，centos官方停止了对centos6的所有更新并且下架了包括官方所有的centos6源，目前阿里、163、清华等centos6源已无法使用。
如果非要用centos6的话就只能使用vault源，国内的vault源的话:
https://mirrors.tuna.tsinghua.edu.cn/centos-vault/、http://mirrors.aliyun.com/centos-vault/
2、解决方法：
2.1备份文件
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2.2更改CentOS-Base.repo文件
vim /etc/yum.repos.d/CentOS-Base.repo
更改内容如下
[base]
name=CentOS-$releasever
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos-vault/centos/RPM-GPG-KEY-CentOS-6
[updates]
name=CentOS-$releasever
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos-vault/centos/RPM-GPG-KEY-CentOS-6
[extras]
name=CentOS-$releasever
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos-vault/centos/RPM-GPG-KEY-CentOS-6
[centosplus]
name=CentOS-6.10 - Plus - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.aliyun.com/centos-vault/centos/RPM-GPG-KEY-CentOS-6
[contrib]
name=CentOS-6.10 - Contrib - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.aliyun.com/centos-vault/centos/RPM-GPG-KEY-CentOS-6
2.2更改epel.repo文件
vim /etc/yum.repos.d/epel.repo
更改内容如下
[epel]
name=Extra Packages for Enterprise Linux 6 - $basearch
baseurl=http://mirrors.aliyun.com/epel-archive/6/$basearch
failovermethod=priority
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
[epel-debuginfo]
name=Extra Packages for Enterprise Linux 6 - $basearch - Debug
baseurl=http://mirrors.aliyun.com/epel-archive/6/$basearch/debug
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
gpgcheck=0
[epel-source]
name=Extra Packages for Enterprise Linux 6 - $basearch - Source
baseurl=http://mirrors.aliyun.com/epel-archive/6/SRPMS
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
gpgcheck=0
2.4 yum更新
yum update sudo
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