Description of problem: Please remove /var/run/nologin from "fedora:26" container image. If one installs SSHd for example, this file prevents any ssh connections.
Please file a ticket for review with the Atomic Working Group as the Atomic WG is responsible for the contents of the container base image. https://pagure.io/atomic-wg
Thank you, FYI https://pagure.io/atomic-wg/issue/316