Where do container images come from?
In the previous chapters, we used pre-built images to run, build, or manage a container, but where do these container images come from?
How can we dig into their source commands or into the Dockerfile/ContainerFile that's used to build it?
Well, as we've mentioned previously, Docker introduced the concept of container image and Container Registry for storing these images – even publicly. The most famous Container Registry is Docker Hub but after Docker's introduction, other cloud container registries were released too.
We can choose between the following cloud container registries:
- Docker Hub: This is the hosted registry solution by Docker Inc. This registry also hosts official repositories and security verified images for some popular open source projects.
- Quay: This is the hosted registry solution that was born under the CoreOS company, though it is now part of Red Hat. It offers private and public repositories...