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It’s a good question, and before you know the answer, Docker images can seem pretty mysterious. Not only do I want to give you the answer, but I want to show you how I got there. Let’s start at the beginning. Hopefully you’re all familiar with a Dockerfile – the instructions on how Docker will build an image for you. Here’s a simple example. Each of these lines are instructions to Docker on how to build an image.

As people continue to adopt CRI-O as a new container runtime for Kubernetes I am hearing questions from administrators who are confused whether they should use Crictl or Podman to diagnose and understand what is going on in a Kubernetes node. This is not one or the other — these tools are complementary, and this article attempts to explain the tools and examine when it is best to use each of these tools. If you take away one thing from this post, remember that Crictl checks the front entrance, while Podman examines the foundation.