Containers running processes as root user are essentially bad thing, which might open attack surface. But still I see many containers running this way. Openshift will block by default execution of containers running processes as root user. Nevertheless if this is really what you want to do this is how you can do it the right way: https://gist.github.com/jstakun/b4d9c5ed567433ecd84fb203c2a85d96
If you want to learn more about running container processes as root user in Openshift check this blog post: https://blog.openshift.com/getting-any-docker-image-running-in-your-own-openshift-cluster/
