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I am trying to deploy a Docker image on Heroku and am trying to understand how to expose multiple ports. Here is the Docker command that I am trying to run in the Heroku deploy:
docker run \
-p 2222:22 \
-p 33306:3306 \
-p 27017:27017 \
-p 28015:28015 \
-p 29015:29015 \
-p 8080:8080 \
test/db-migration
How do I do this in Heroku?
566
You can do this in the following ways: Add an EXPOSE instruction in the Dockerfile. Use the –expose flag at runtime to expose a port. Use the -p flag or -P flag in the Docker run string to publish a port.
The above command opens two random ports in the host computer and maps them with ports 8080 and 8081 of the Docker container. It behaves the same way if we expose a range of ports. This way, we also keep control of which ports of the container opens up to the outside.
There are several ways to do this: you can expose a port via the --expose flag at runtime, or include an EXPOSE instruction in the Dockerfile. You can also publish ports by using the -p or -P flags in the Docker run string. There's also container linking via --link .
You can't - you should use the $PORT environment variable which will be randomly assigned and then mapped to port 80 by the Heroku routers. Also, only http requests are accepted. See https://devcenter.heroku.com/articles/container-registry-and-runtime#dockerfile-commands-and-runtime for more details.
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