Verify filebeat is reading logs from a docker container

I am attempting to setup reading logs from a docker container running a web server to filebeat to logstash and I cannot seem to get it right.

My question is how do I verify if filebeat is even getting anything from the web server container? can I simply dump anything it gets to a log or stdout, I cannot figure out how, everything I try I only see a periodic monitor.

For extra credit would also need to run everything in containers but I can skip that for filebeat at the moment.

Obviously I have almost zero experience with these things since I am almost positive this is an easy thing to do that has been done many times before.