场景
CentOS的版本为6.9，在使用yum install 安装相关依赖时提示:
Cannot find a valid baseurl for repo: centos-sclo-rh
注：
博客：
https://blog.csdn.net/badao_liumang_qizhi
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实现
原因是官方结束了对CentOS6的支持，导致在使用yum安装或更新程序的时候出现错误。
首先清空CenOS-Base.repo文件
echo > /etc/yum.repos.d/CentOS-Base.repo然后编辑该文件
vi /etc/yum.repos.d/CentOS-Base.repo然后按键盘上的i键进入编辑模式，将下面的内容复制进去
[base]
name=CentOS-$releasever - Base
#mirrorlist=http://#mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
baseurl=https://vault.centos.org/6.10/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#released updates
[updates]
name=CentOS-$releasever - Updates
#mirrorlist=http://#mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
baseurl=https://vault.centos.org/6.10/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
#mirrorlist=http://#mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
baseurl=https://vault.centos.org/6.10/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
#mirrorlist=http://#mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
baseurl=https://vault.centos.org/6.10/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
#mirrorlist=http://#mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib&infra=$infra
baseurl=https://vault.centos.org/6.10/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6然后按Esc退出编辑模式，再输入
:wq!保存并退出
然后删除掉/etc/yum.repos.d/目录下其他无关的repo文件
cd /etc/yum.repos.d/ls | grep -v 'CentOS-Base.repo' | xargsrm然后重建yum缓存，更新并启动新的yum源
yum clean all && yummakecache此时需要等待一段时间，不要按回车。
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