Ubuntu
Focal Bionic Xenial Jammy

deb http://mirror.ubuntu.serverforge.org/ focal main restricted universe multiverse
deb http://mirror.ubuntu.serverforge.org/ focal-updates main restricted universe multiverse
deb http://mirror.ubuntu.serverforge.org/ focal-security main restricted universe multiverse

CentOS
6 7 8
East Coast West Coast

[base]
name=CentOS-$releasever - Base
baseurl=http://mirror.centos.iad1.serverforge.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-8
priority=1

[updates]
name=CentOS-$releasever - Updates
baseurl=http://mirror.centos.iad1.serverforge.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-8
priority=1