安装

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yum -y install centos-release-scl

centos7.9安装后遇到无法使用yum的问题，报错无法访问 http://mirrorlist.centos.org?arch=x86_64&release=7&repo=sclo-sclo ，换国内源即可解决

换源

修改两个文件内容

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mv /etc/yum.repos.d/CentOS-SCLo-scl.repo /etc/yum.repos.d/CentOS-SCLo-scl.repo.bak
mv /etc/yum.repos.d/CentOS-SCLo-scl-rh.repo /etc/yum.repos.d/CentOS-SCLo-scl-rh.repo.bak

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vim /etc/yum.repos.d/CentOS-SCLo-scl.repo
vim /etc/yum.repos.d/CentOS-SCLo-scl-rh.repo

更换为

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[centos-sclo-rh]
name=CentOS-7 - SCLo rh
baseurl=http://vault.centos.org/centos/7/sclo/x86_64/rh/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-SCLo

[centos-sclo-sclo]
name=CentOS-7 - SCLo sclo
baseurl=http://vault.centos.org/centos/7/sclo/x86_64/sclo/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-SCLo

清理缓存并生成新缓存

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sudo yum clean all
sudo yum makecache