报错：centos6 yum安装软件报错Cannot retrieve repository metadata (repomd.xml) for repository: epel 的解决办法
原因分析：官方已经停止更新centos6相关的源，可以使用其他源替代
报错信息：
# yum clean all && yum makecache
ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
To address this issue please refer to the below knowledge base article
https://access.redhat.com/articles/1320623
If above article doesn't help to resolve this issue please open a ticket with Red Hat Support.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: epel. Please verify its path and try again
解决办法：
1.修改基础repo
sed -i "s|enabled=1|enabled=0|g" /etc/yum/pluginconf.d/fastestmirror.conf mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup curl -o /etc/yum.repos.d/CentOS-Base.repo https://www.xmpan.com/Centos-6-Vault-Aliyun.repo yum clean all yum makecache
2.修改epel repo
vim /etc/yum.repos.d/epel.repo
enabled=1 改为 enabled=0
贴一下具体的repo内容，系统是cetos6.10，可以根据情况进行修改
vim /etc/yum.repos.d/epel.repo
[epel] name=Extra Packages for Enterprise Linux 6 - $basearch baseurl=http://mirrors.aliyun.com/epel/6/$basearch failovermethod=priority enabled=0 gpgcheck=0 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6 [epel-debuginfo] name=Extra Packages for Enterprise Linux 6 - $basearch - Debug baseurl=http://mirrors.aliyun.com/epel/6/$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 - $basearch - Source baseurl=http://mirrors.aliyun.com/epel/6/SRPMS failovermethod=priority enabled=0 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6 gpgcheck=0
cat /etc/yum.repos.d/CentOS-Base.repo
# CentOS-Base.repo # # The mirror system uses the connecting IP address of the client and the # update status of each mirror to pick mirrors that are updated to and # geographically close to the client. You should use this for CentOS updates # unless you are manually picking other mirrors. # # If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead. # # [base] name=CentOS-6.10 - Base - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos-vault/6.10/os/$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 gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6