Error: Unable to find a match: centos-release-openstack code example
Example: Error: Unable to find a match: centos-release-openstack-queens
sudo yum install -y https://rdoproject.org/repos/rdo-release.rpm
sudo yum install centos-release-openstack-stein
sudo yum-config-manager --enable openstack-stein
sudo yum update
sudo yum install -y openstack-packstack