How can I expose more than 1 port with Docker?

Question

So I have 3 ports that should be exposed to the machine's interface. Is it possible to do this with a Docker container?

Answer 1

To expose just one port, this is what you need to do:

docker run -p <host_port>:<container_port> 

To expose multiple ports, simply provide multiple -p arguments:

docker run -p <host_port1>:<container_port1> -p <host_port2>:<container_port2> 

Answer 2

Step1

In your Dockerfile, you can use the verb EXPOSE to expose multiple ports.
e.g.

EXPOSE 3000 80 443 22 

Step2

You then would like to build an new image based on above Dockerfile.
e.g.

docker build -t foo:tag . 

Step3

Then you can use the -p to map host port with the container port, as defined in above EXPOSE of Dockerfile.
e.g.

docker run -p 3001:3000 -p 23:22 

In case you would like to expose a range of continuous ports, you can run docker like this:

docker run -it -p 7100-7120:7100-7120/tcp