Show all Docker build output

You may have noticed with newer versions of Docker that the output of each layer’s commands is shown only while that layer is being built, and is then hidden.

You can control this behavior the --progress output of the docker build command:

docker build --help
...
  --progress string         Set type of progress output (auto, plain, tty).
                            Use plain to show container output (default "auto")

Via stackexchange.com.