Image Builder builds bootable OS images of Fedora, CentOS, and RHEL. With support for multiple versions of each distribution, four hardware architectures, and a growing number of cloud environments and workloads, it quickly becomes hard to manage the number of configurations, while still being very confident that almost any image we build passes a minimal level of usability (booting, for starters). We customise and personalise each image we build based on three kinds of properties: the baseline configuration for the distribution on a given platform (core packages, partition table, etc.), the target environment configuration (e.g., cloud provider), and user-provided customisations. We think of these as layers, each one modifying or adding to elements of the previous configuration. In this talk, we will discuss our recent efforts to revisit these abstractions, formalise them, represent them in code, and present them to our users, while we try to invent the universe of image definitions.
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