How do I map a port on a container to the host?

Question

I'm trying to run a container described by the following Dockerfile:

FROM node:11.4.0 RUN npm install -g sh RUN npm install -g json-server WORKDIR /data VOLUME /data COPY db.json /data CMD json-server --watch db.json --port 3001

and specifying the listening port by running:

 docker run -it -p 3001:3001 abelalejandro/json-server:final

The container seems to be running fine and json-server is telling me it is serving my requests on port 3001 yet I can't get any joy when browsing http://localhost:3001

Am I missing something on publishing/exposing ports?

Ian · Accepted Answer · 2018-12-21 12:28:41Z

7

It is binding to localhost instead of 0.0.0.0 (any host).

You can change that by setting:

CMD json-server --watch db.json --host 0.0.0.0 --port 3001

I'm assuming you are using https://github.com/typicode/json-server.

answered Dec 21, 2018 at 12:28

Ian

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1 Comment

Sujay Pillai Over a year ago

As a matter of good practice I would suggest adding EXPOSE instruction into your Dockerfile which would serve as a good documentation for the user running the container. Try building the image with/without EXPOSE instruction and do a docker image inspect abelalejandro/json-server:final to see more metadata attached to the image.

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