domain2.md

Domain 2: Image Creation, Management, and Registry

Describe Dockerfile options

search options

Show the main parts of a Dockerfile

• FROM: Initializes a new build stage and sets the Base Image
• RUN: Execute any commands in a new layer on top of the current image
• CMD: Defaults for an executing container
  • Sould be an executable
  • Only 1 per file
  • Should be in JSON format
• LABEL: Adds metadata to an image
• EXPOSE: Listens on the specified network ports at runtime
• ENV: Sets the environment variable <key> to the value <value>
• ADD: Copies new files, directories or remote file URLs from <src> to container's <dest>
• COPY: Copies new files or directories from <src> and adds them to the filesystem of the container at the path <dest>
• ENTRYPOINT: Allows you to configure a container that will run as an executable
• VOLUME: Creates a mount point with the specified name and marks it as holding externally mounted volumes from native host or other containers
• WORKDIR: Sets the working directory for instructions that follow it in the Dockerfile

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• Give examples on how to create an efficient image via a Dockerfile
• Use CLI commands such as list delete prune rmi etc to manage images
• Inspect images and report specific attributes using filter and format
• Demonstrate tagging an image
• Utilize a registry to store an image
• Display layers of a Docker image
• Apply a file to create a Docker image
• Modify an image to a single layer
• Describe how image layers work
• Deploy a registry
• Configure a registry
• Log into a registry
• Utilize search in a registry
• Tag an image
• Push an image to a registry
• Sign an image in a registry
• Pull an image from a registry
• Describe how image deletion works
• Delete an image from a registry