703

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

lifeisfoo
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nubela
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7 Answers7

1071

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>
Chris Seymour
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Tania Ang
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    Thanks! Found this in the docs here: http://docs.docker.com/userguide/dockerlinks/#network-port-mapping-refresher where it says `Note: The -p flag can be used multiple times to configure multiple ports.` – Ted M. Young Jul 14 '14 at 19:32
  • Is there a way to specify the ports in a config file? For example using the option `--env-file` ? – Giovanni Bitliner Jan 21 '15 at 21:21
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    @GiovanniBitliner I'm still pretty new to this, but I'm pretty sure you would define ports in a Dockerfile with [EXPOSE](https://docs.docker.com/reference/run/#expose-incoming-ports), then perform `docker run -P` (note the uppercase) which automatically exposes all ports defined with EXPOSE in the Dockerfile – Ted Avery May 14 '15 at 13:13
  • Multiple ports can halting the init process under a systemd service file? – Lanti Jul 01 '15 at 20:15
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    I think the correct term here is `publish` not `expose`. – tgogos Dec 01 '17 at 14:17
  • @ChrisSeymore where do we run these commands? Do we run them inside the docker container? – pandasCat Sep 18 '18 at 20:43
  • Is it is possible to map multiple docker ports to 1 host port? – variable Jun 03 '20 at 11:40
  • I tried exposing multiple ports using multiple `-p` flags but it only exposed one port (the last argument of -p). I am using Docker Desktop with Docker Engine v20.10.5 – CᴴᴀZ Aug 25 '21 at 07:42
465

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
mainframer
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    EXPOSE is only documentation for the ports that are published and useful for linking only. A complete list of ports can be found using -P and they will be automatically mapped to an available port on the host. – Arun Gupta Oct 20 '15 at 11:01
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    Expose is not needed. Remove the first step or make it optional. – Amir Hossein Baghernezad Feb 08 '18 at 06:47
46

if you use docker-compose.ymlfile:

services:
    varnish:
        ports:
            - 80
            - 6081

You can also specify the host/network port as HOST/NETWORK_PORT:CONTAINER_PORT

varnish:
    ports:
        - 81:80
        - 6081:6081
Rashidul Islam
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    When you specify just one number (e.g. `80`, not `80:80`), `docker` maps the specified container port to a host port from the ephemeral range. – x-yuri Dec 28 '20 at 22:16
5

Use this as an example:

docker create --name new_ubuntu -it -p 8080:8080 -p  15672:15672 -p 5432:5432   ubuntu:latest bash

look what you've created(and copy its CONTAINER ID xxxxx):

docker ps -a

now write the miracle maker word(start):

docker start xxxxx

good luck

Aramis NSR
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4

If you are creating a container from an image and like to expose multiple ports (not publish) you can use the following command:

docker create --name `container name` --expose 7000 --expose 7001 `image name`

Now, when you start this container using the docker start command, the configured ports above will be exposed.

Liam
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PhantomReference
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4

Only one point to add. you have the option to specify a range of ports to expose in the dockerfile and when running it:

on dockerfile:

EXPOSE 8888-8898

Build image:

docker build -t <image_name>:<version> -f dockerfile .

When running the image:

docker run -it -p 8888-8898:8888-8898 -v C:\x\x\x:/app <image_name>:<version>
HMS
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0
WORKDIR /usr/src/app

COPY package*.json ./

RUN npm install
RUN npm install -g pm2

COPY . ./

EXPOSE 3000
EXPOSE 9200

CMD npm run start

it is not working for two ports

Yaroslavm
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yatendra srivastava
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