CKI GitLab pipelines roughly come in two flavors: pipelines that build kernels from source, and pipelines that download prebuilt kernels from Koji.
Building kernels from source
The following figure provides a slightly simplified overview of a CKI GitLab pipeline for a CentOS Stream 9 merge request where kernels are built from the sources in the merge request:
Different colors represent different architectures of the underlying machines. The machines are either provided by AWS EC2 (“AWS” with single outline on the diagram) or by an on-premise data center (“DC” with double outline on the diagram).
Using prebuilt kernels
For comparison, this is a pipeline for a prebuilt kernel from Koji:
Again, machines are either provided by AWS EC2 (“AWS” with single outline on the diagram) or by an on-premise data center (“DC” with double outline on the diagram).
Depending on various factors, the jobs in a given pipeline will be different:
- kernel built from source or already prebuilt via Koji
- supported architectures, native compilation or native tools
- retriggered pipelines for CI testing using artifacts from previous pipelines
Retriggered pipelines use components of the staging environment where available.