Container Image [Dido Solutions, Inc Wiki]

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====== Container Image ======

[[dido:99_annexes:annex-b-terms-and-definitions:start|Go to Terms and Definitions]]

===== Discussion =====

A Container Image is an immutable [[dido:99_annexes:annex-b-terms-and-definitions:i:image]] [[dido:99_annexes:annex-b-terms-and-definitions:a:artifact|Artifact]] that packages the files, software, configuration, and metadata required to instantiate a containerized workload.

A Container Image may contain:

  * Application files
  * Executable software
  * Runtime libraries
  * Operating-system files
  * Configuration files
  * Environment defaults
  * Startup instructions
  * Dependency information
  * Image metadata
  * One or more filesystem layers

A container runtime uses a Container Image to create one or more container instances.

Multiple container instances may originate from the same Container Image while maintaining separate runtime state.

A Container Image differs from a container:

  * A Container Image is the immutable image Artifact used to create a container
  * A container is a runtime instance created from a Container Image

A Container Image differs from a [[dido:99_annexes:annex-b-terms-and-definitions:m:machine_image|Machine Image]]:

  * A Container Image packages the content required to instantiate a containerized workload within a container runtime
  * A Machine Image packages the content required to instantiate a virtual machine

A Container Image may use layered content. A change to image content produces a new Container Image rather than modifying an existing immutable image in place.

A Container Image may participate in:

  * Image building
  * Image signing
  * Image verification
  * Compliance assessment
  * Image promotion
  * Repository publication
  * Offline transfer
  * Containerized-workload deployment

===== Definition =====
//[[dido:99_annexes:annex-b-terms-and-definitions:i:image|image]] that packages the software, configuration, files, metadata, and other content required to instantiate a containerized workload//

===== Source =====

Dido Solutions, Inc. and Jackrabbit Consulting, Inc.

===== Note =====

A Container Image may be identified by:

  * A repository name
  * A tag
  * A content digest
  * A [[dido:99_annexes:annex-b-terms-and-definitions:r:revision|Revision]] identifier
  * A release identifier
  * A combination of these identifiers

A mutable tag does not make the referenced Container Image mutable. A tag may be reassigned to another Container Image, while each content-addressed image remains distinguishable by its digest.

A Container Image does not by itself establish that the image is:

  * Approved
  * Signed
  * Verified
  * Free from vulnerabilities
  * Compliant with an applicable [[dido:99_annexes:annex-b-terms-and-definitions:b:baseline|Baseline]]
  * Authorized for deployment
  * Compatible with a particular container runtime
  * Suitable for a specified purpose

Separate requirements govern those determinations.

The term does not prescribe a particular image format, container runtime, image registry, orchestration platform, operating system, or provider implementation.

===== Example =====

[[dido:99_annexes:annex-b-terms-and-definitions:c:crucible|Crucible]] builds a Container Image containing an application, its runtime libraries, configuration defaults, startup instructions, and identifying metadata. A container runtime later uses the Container Image to instantiate multiple containerized workloads.

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