Chapter 15. TCI - Image Building

Question 1

What is the background and goal of image building?

Answer 1

• for starting a new or replacing an old service we need the image from which the service can be started
• these images should be created in an automated fashion

Question 2

How does the Image building function in Podman?

Answer 2

• read instructions from a text file and generate the requested image
• internally after each instruction it creates a container and then commits it to persistent storage
• the instruction file is called Dockerfile or Containerfile, makes Podman more flexible with the source used for image build process
• both files have the same instruction syntax
• Containerfiles start from a base image, that is modified by subsequent instructions in the file

Question 3

What are image registries and for what are they used?

Answer 3

• repository or has the capabilities to store multiple repositories which provide means to segregate the registry into isolated projects dedicated to individual users, teams, organizations, etc

Question 4

What are a few popular image registries?

Answer 4

• ArtifactHub (CNCF) open source
• Docker Hub
• Harbor
• Skopeo
• Azure Container Registry
• AWS Elastic Container Registry