Unraveling the Magic Behind Buildpacks
summary
Demo constructs an OCI image from first principles and created an OCI image layout by hand, producing a BusyBox-based image that is built BusyBox image with no root and pushed with crane, then pulled and run successfully. Lifecycle phases (analyze, detect, restore, build, export) are shown end-to-end and the pack CLI is used to compose buildpacks into layered OCI images with SBOM output; rebasing enables OS fixes across thousands of applications without rebuilds.
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chapters (16)
- 0:00Start
- 0:30Agenda
- 2:06Dockerfile
- 3:04Config Blob
- 6:05Docker Commit
- 9:00Follow the Ocl Layout Specification
- 10:38Creating the Config Blob
- 12:01Manifest
- 15:13What a Build Pack Actually Is
- 16:31What Build Packs Actually Do
- 19:31What Goes into a Layer Directory
- 25:05Build Phase
- 31:15Configure the Environment
- 33:37Recap
- 34:21Limitations of the Build Pack Api
- 36:23Dependency Updates
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