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CentOS7.9 & CentOS-8.5 yum源
一 、centos7.9
cat > /etc/yum.repos.d/CentOS-Base.repo <<EOF
[base]
name=CentOS-7 - Base
baseurl=https://vault.centos.org/7.9.2009/os/x86_64/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
[updates]
name=CentOS-7 - Updates
baseurl=https://vault.centos.org/7.9.2009/updates/x86_64/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
[extras]
name=CentOS-7 - Extras
baseurl=https://vault.centos.org/7.9.2009/extras/x86_64/
gpgcheck=1
gpgkey=file:///etc/pmi/rpm-gpg/RPM-GPG-KEY-CentOS-7
EOF
yum clean all
yum makecachecentos8.5
1、以root用户打开/etc/yum.repos.d文件夹，找到三个文件
CentOS-AppStream.repo
CentOS-Base.repo
CentOS-Extras.repo
2、在注释掉的下一行分别加上阿里云镜像源地址，可以看到文件名与下面要替换的地址是对应的
#vi CentOS-AppStream.repo
#更改如下：
#mirrorlist=http://mirrorlist.centos.org/? #加#注释掉三个文件对应的的地址
baseurl=https://mirrors.aliyun.com/centos/$releasever-stream/AppStream/$basearch/os/
#vi CentOS-Base.repo
#更改如下：
#mirrorlist=http://mirrorlist.centos.org/? #加#注释掉三个文件对应的的地址
baseurl=https://mirrors.aliyun.com/centos/$releasever-stream/BaseOS/$basearch/os/
#vi CentOS-Extras.repo
#更改如下：
#mirrorlist=http://mirrorlist.centos.org/? #加#注释掉三个文件对应的的地址
baseurl=https://mirrors.aliyun.com/centos/$releasever-stream/extras/$basearch/os/
yum clean all
yum makecache