Centos 7 and xibo-docker-1.8.9 can't get to xibo application

Apache inside the container is all pre-configured for you. It can’t serve an “It Works” page.

If I were you, I’d go with a distribution people here are familiar with and have written detailed guides for:

Or if you’re not comfortable working with and troubleshooting servers, look at getting Cloud hosting so that all the potential hassles of that are taken care of for you.