To map the application or the host port number to the docker container port number, you can use the docker run command followed by the -p flag (port number flag) and then the docker port number followed by a : (colon) and then the application port number and then the name of the docker image to use.
TL;DR
# Map application or host port number
# to docker container port number
docker run -p <DOCKER_PORT_NUMBER>:<APPLICATION_PORT_NUMBER> docker/getting-started
# Example:
# --------
# docker run -p 3000:80 docker/getting-started
For example, let's say we want to run a docker container on port 3000 in which the original application port number is running on port number 80.
To do that we can use the docker run command like this,
# Map application or host port number
# to docker container port number
docker run -p 3000:80 docker/getting-started
- After running the above command the docker container which is using the
docker/getting-startedimage can be accessible atlocalhost:3000even though the original application port number is80.
And like that, we have successfully mapped the docker container port number to the application or the host port number 🎉.
If you want to try out the docker commands online, see the Play with docker lab website to test out the commands.
That's all 😃!