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Answering Machine

A dead simple Go application that starts a server on 8080 and has does two things:

  • Accepts a POST to the /messages endpoint.
  • Accepts a GET to the /messages endpoint.

This repository will serve as a simple "training ground" for Docker. Answering Machine will have a component application, Telephone, that will POST messages to the /messages endpoint. This repository will have an intentionally "weak" Dockerfile, which has just enough information for a noob to get started with running their own Answering Machine.

You should leave a message!

Installation

You'll need an installation of Go, and once Go is on your path:

go run main.go

This will start the server. You should get a 200 response if you:

curl -v localhost:8080/messages

The Exercise

  1. Start a container with this Dockerfile.
  2. I want to curl the Answering Machine, how do I expose it to my localhost?
  3. This is my answering machine, not Docker's! How can I change the ANSWERING_MACHINE_OWNER environment variable so I can make this my own?
  4. Link your Answering Machine to a local Telephone.

The Goal

To learn some more advanced Dockerfile commands:

  • EXPOSE
  • ENV

and docker CLI commands:

  • -p
  • --link