Stop Re-Downloading Your Container Images: Content-Based Layers with Chunkah
summary
Tool called chunkah post-processes OCI images to regroup files by package so a 5 MB Vim update no longer forces re-downloading a 500 MB instruction-based layer. It scans the rootfs, groups RPM/ALPM packages (defaults to 64 layers, files >1 MB get their own layer), repacks layers without changing content, and remains reproducible. Demo converts a Fedora base from one ~200 MB layer to many layers and Hummingbird runs 70+ images sharing 15 layers between nginx and httpd.
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chapters (7)
- 0:00Introduction to Chunkah
- 0:30The problem with layers
- 4:03The solution: content-based layering
- 5:58Key features and configuration
- 9:08Live demonstration
- 15:10Adoption and ecosystem
- 16:44Q&A session
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