yum install centos-release-scl
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.fra10.de.leaseweb.net
* epel: mirror.init7.net
* extras: ftp.tu-chemnitz.de
* updates: mirror1.hs-esslingen.de
http://mirror.fra10.de.leaseweb.net/centos/7.7.1908/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
To address this issue please refer to the below wiki article
https://wiki.centos.org/yum-errors
If above article doesn't help to resolve this issue please use https://bugs.centos.org/.
http://ftp.plusline.net/centos/7.7.1908/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://centos.mirrors.psw.services/centos/7.7.1908/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://centosmirror.netcup.net/centos/7.7.1908/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
Fix:
yum clean all