How do you add items to .dockerignore?

Question

I\'m not able to find many examples of what a .dockerignore file should look like.

Using puppet to install a few packages on a docker container causes the image to

Answer 1

A different way of doing it, creating a smaller image, is to run librarian-puppet in the host, not in Docker, so you don't end with librarian, ruby, gems,... installed in the image.

I ended with a 622MB image for jenkins slave using Puppet, and a 480MB image without Puppet.