when you spin a container , you map a host port with a container port using -p parameter
docker run -v ~/clearml.conf:/root/clearml.conf -p 8080:8080 -e CLEARML_SERVING_TASK_ID =<service_id> -e CLEARML_SERVING_POLL_FREQ =5 clearml-serving-inference:latest
Here you map your computer's port 8080 with the container port 8080. If your 8080 port is already used, you can use another, using for example -p 8081:8080