Katacoda allows ports running include the environment to be made available to users. This is designed for displaying dashboards and UI elements running inside a container.
Within the markdown for a step, use a URL shown below that will be updated when the environment is connected.
Render port 8500: https://[[HOST_SUBDOMAIN]]-8500-[[KATACODA_HOST]].environments.katacoda.com/
Render port 80: https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/
Display page allowing user to select port:
https://[[HOST_SUBDOMAIN]]-[[KATACODA_HOST]].environments.katacoda.com/