CentOS7.9归档源

1、清理现有源

（1）方式一、删除现有源

rm -rf /etc/yum.repos.d/*.repo

（2）方式二、备份现有源

for file in *.repo; do
    if [ "$file" != "local.repo" ]; then
        mv "$file" "$file.bak"
    fi
done

2、替换为归档源

cat > /etc/yum.repos.d/CentOS-Base.repo << EOF
[base]
name=CentOS-7 – Base – Archive
baseurl=http://archive.kernel.org/centos-vault/7.9.2009/os/x86_64/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1

[updates]
name=CentOS-7 – Updates – Archive
baseurl=http://archive.kernel.org/centos-vault/7.9.2009/updates/x86_64/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1

[extras]
name=CentOS-7 – Extras – Archive
baseurl=http://archive.kernel.org/centos-vault/7.9.2009/extras/x86_64/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
EOF

3、重建缓存

yum clean all
yum makecache