Summary

Docker port variable is null when a port mapping is added with no host port (implicit port, docker will bind the container port to whatever it finds available on the host).

Steps to Reproduce

1. Create a Bamboo plan with a Docker task with the below config:
   • Command: Run a docker container
   • Detach container [x]
   • Add a port mapping: Host empty, Container: 8085
   • Wait for service to start [x]
   • Service URL pattern: http://localhost:${docker.port}
2. Run a build

Expected Results

Host port is found and tested successfully during build.

Actual Results

25-Oct-2017 12:11:58	Attempting connection to http://localhost:null
25-Oct-2017 12:11:58	Failed connecting to http://localhost:null, error: invalid port number

Workaround

None