[undertow-dev] Undertow with Docker Port issue

Hi, Has anyone managed to get undertow working with docker (on CoreOS)? I have a very basic jar that starts up an undertow server on (localhost at port 80) and has a single HttpHandler at the endpoint ‘/hello’. I’ve tested the jar locally and the endpoint works fine. I have a docker file along the lines of: --------------- FROM dockerfile/java:oracle-java8 ## wget the app from a server CMD java -jar my-app.jar EXPOSE 80 --------------- I then run the container (after building it from the above docker file) as follows: docker run -d -p 80:80 my-app (Yes I made sure the server did start and is running before the following:) I see that the iptables are as follows (which is identical to what dockerfiles/nginx produces): --------------- Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT tcp -- anywhere 172.17.0.65 tcp dpt:http ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED ACCEPT all -- anywhere anywhere ACCEPT all -- anywhere anywhere Chain OUTPUT (policy ACCEPT) target prot opt source destination --------------- Finally I try to curl at the ‘/hello’ endpoint but I just get a connection refused. I try the curl request to localhost from within the same server and it doesn’t work. I also try from a different computer using the public IP of the machine and it does’t work. The dockerfile/nginx works perfect when I curl at it at port 80. I’m stumped for ideas, please help! Thanks, Chris