CentOS 6 repolist

sed -i 's/enabled=1/enabled=0/g' /etc/yum/pluginconf.d/fastestmirror.conf

cat <<EOF > /etc/yum.repos.d/vault.repo
[vault]
name=CentOS-$releasever - Vault
baseurl=http://vault.centos.org/centos/$releasever/os/$basearch/
enabled=1
gpgcheck=1
EOF

yum clean all
yum repolist