For CentOS 7
mirrorlist.centos.org doesn’t exists anymore. So, your default repor wwith yum doesn’t work. Try using the following processes, it worked for me, hope this works for others as well.
sed -i s/mirror.centos.org/vault.centos.org/g /etc/yum.repos.d/*.repo sed -i s/^#.*baseurl=http/baseurl=http/g /etc/yum.repos.d/*.repo sed -i s/^mirrorlist=http/#mirrorlist=http/g /etc/yum.repos.d/*.repo
Ref:
https://serverfault.com/questions/1161816/mirrorlist-centos-org-no-longer-resolve
For CentOS 8
sed -i 's/^mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-* sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*