参考链接： https://wiki.centos.org/zh/About/Product
尝试了163、清华源、都不行
阿里源也整了半天才在最下面的相关链接发现能找到源的地址 https://developer.aliyun.com/mirror/centos?spm=a2c6h.13651102.0.0.3e221b11shelh6
备份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
下载新的 CentOS-Base.repo 到 /etc/yum.repos.d/
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-6.repo
替换源文件配置, 使用https://mirrors.aliyun.com/centos-vault/
官方: 非阿里云ECS用户会出现 Couldn’t resolve host ‘mirrors.cloud.aliyuncs.com’ 信息，不影响使用。用户也可自行修改相关配置: eg:
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
替换http成https
sed -i 's/http/https/g' /etc/yum.repos.d/CentOS-Base.repo
替换版本，$releasever替换6.8, 6.8是我用的版本
sed -i 's/$releasever/6.8/g' /etc/yum.repos.d/CentOS-Base.repo
替换centos为centos-vault
sed -i 's/centos/centos-vault/g' /etc/yum.repos.d/CentOS-Base.repo
yum clean all && yum makecache
[root@hadoop101 yum.repos.d]# yum clean all && yum makecache
已加载插件：fastestmirror, refresh-packagekit, security
Cleaning repos: base extras updates
清理一切
Cleaning up list of fastest mirrors
已加载插件：fastestmirror, refresh-packagekit, security
Determining fastest mirrors
base | 3.7 kB 00:00
base/group_gz | 226 kB 00:00
base/filelists_db | 6.4 MB 00:01
base/primary_db | 4.7 MB 00:00
base/other_db | 2.8 MB 00:00
extras | 3.4 kB 00:00
extras/filelists_db | 38 kB 00:00
extras/prestodelta | 1.3 kB 00:00
extras/primary_db | 37 kB 00:00
extras/other_db | 51 kB 00:00
updates | 3.4 kB 00:00
updates/filelists_db | 3.5 MB 00:00
updates/prestodelta | 390 kB 00:00
updates/primary_db | 5.4 MB 00:01
updates/other_db | 74 MB 00:12
元数据缓存已建立
[root@hadoop101 yum.repos.d]#
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原文链接：https://blog.csdn.net/qq_37746897/article/details/110759717