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2.Image Creation, Management, and Registry.md

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Image Creation, Management, and Registry

1. Describe Dockerfile options [add, copy, volumes, expose, entrypoint, etc)

  • FROM: initializes a new build stage and sets the Base Image for subsequent instructions
  • ENV: Sets environment variables that are visible in later build steps as well as during container runtime.
  • RUN: Executes a command and commits the result to the image file system.
  • CMD: Sets the default command for containers, and this gets overridden if a command gets specified at container runtime.
  • ENTRYPOINT: Sets the default executable for containers. This can still be overridden at container runtime, but requires a special flag. When ENTRYPOINT and CMD are both used, ENTRYPOINT sets the default executable, and CMD sets default arguments. EXPOSE: Documents ports that are intended to be published at runtime. Note: that this does not actually publish the ports.
  • WORKDIR: Sets the working directory, both for subsequent build steps and for the container at runtime. We can use WORKDIR multiple times. If the WORKDIR begins with a forward slash /, then it will set an absolute path. Otherwise, it will set the working directory relative to the previous working directory.
  • COPY: Copies files from the build host into the image file system.
  • ADD: Copies files from the build host into the image file system. Unlike COPY, ADD can also extract an archive into the image file system and add files from a remote URL.
  • STOPSIGNAL: Sets a custom signal that will be used to stop the container process.
  • HEALTHCHECK: Sets a command that will be used by the Docker daemon to check whether the container is healthy.

Show the main parts of a Dockeffile

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 (not architect)

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