example2

Example 2

This is a container built from scratch with a static golang binary inside (plus a secret file which should not be baked into the image).

You can see what it builds at https://hub.docker.com/layers/aar1/hash-service/latest/images/sha256-080862ad6ad33d97dd1be683ebf6954e83a9f7b4d0d9010828e37c4a753184e7?tab=layers

Notice how only the contents of the scratch container end up visible on DockerHub. The builder container layers and commands are not part of the final image.

Usage

Example usage:

1. Set the DOCKERHUB_USER_NAME to your DockerHub user name, e.g. export DOCKERHUB_USER_NAME=myuser.
2. Run make build to build the image.
3. Run make run to run the image and test it, e.g. curl http://0.0.0.0:8080/ping?parameter=12345. The output is based on a hash of the URL parameters and some secrets, so try different parameter values to get different outputs.
4. Run make push to push the image to DockerHub. This will fail if you didn't set the correct user name in step 1, or if you haven't first run docker login.

Health Warning

This is a very simple demo which doesn't follow good practice, the focus is on demonstrating how layers work and what can end up inside a Docker image. Some major deviations from good practice are noted in comments.

Don't treat this as a good example of a golang application! Go and read the current golang docs, add linting and other good things.