1.2. Image Builder terminology

Blueprints Blueprints define customized system images by listing packages and customizations that will be part of the system. Blueprints can be edited and they are versioned. When a system image is created from a blueprint, the image is associated with the blueprint in the Image Builder interface of the RHEL 7 web console.

Blueprints are presented to the user as plain text in the Tom’s Obvious, Minimal Language (TOML) format.

Compose Composes are individual builds of a system image, based on a particular version of a particular blueprint. Compose as a term refers to the system image, the logs from its creation, inputs, metadata, and the process itself.

Customization Customizations are specifications for the system, which are not packages. This includes user accounts, groups, kernel, timezone, locale, firewall and ssh key.