Chapter 3: Working with Container Images

1. A Docker registry is an organized, hierarchical system for storing Docker images, providing scalable distribution of images. Docker Hub is the official, public Docker registry hosted and managed by Docker, Inc.
2. A tag is a versioning label for a single image in a repository.
3. <dockerId>/<repositoryName>:<tag>
4. Azure Container Registry (ACR) is a fully managed private Docker registry provided by the Azure cloud. In the case of ACR, you store the images using your own Azure storage account and you can make the registry fully private, for your own infrastructure needs.
5. latest is the default tag used when you pull or build images (if you do not specify an explicit tag). In general, you should not use the latest tag apart from in development scenarios. In production, always specify an explicit tag for your Kubernetes manifests...