is working on open-falcon of Xiaomi, one of which is retrieved from docker .
follow the tutorial and execute docker"s:

-sharp make the imagerun commands under dir of dashboard:
docker build -t falcon-dashboard:v1.0 .

-sharp start the container
docker run -itd --name aaa --net host \
    -e API_ADDR=http://127.0.0.1:8080/api/v1 \
    -e PORTAL_DB_HOST=127.0.0.1 \
    -e PORTAL_DB_PORT=3306 \
    -e PORTAL_DB_USER=root \
    -e PORTAL_DB_PASS=123456 \
    -e PORTAL_DB_NAME=falcon_portal \
    -e ALARM_DB_PASS=123456 \
    -e ALARM_DB_HOST=127.0.0.1 \
    -e ALARM_DB_PORT=3306 \
    -e ALARM_DB_USER=root \
    -e ALARM_DB_PASS=123456 \
    -e ALARM_DB_NAME=alarms \
    falcon-dashboard:v1.0

from the above command, you don"t see anything that-p is used to bind port mappings, but somehow you can still request the port of an item in the docker container.
that"s weird.