Migrate to Alpine Linux with 57.9% image size reduction #8
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jserv
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Ubuntu-based image, powered by eclipse-temurin:11-jre-noble, was 1.3 GB, unnecessarily large for a Jupyter notebook environment. Debian base includes many unnecessary packages, apt cache bloat, and no aggressive Python artifact cleanup. Fix: - Migrate from Ubuntu to Alpine Linux 3.22 (musl-based, 5.4MB base) - Multi-architecture support (linux/amd64, linux/arm64) via BuildKit TARGETARCH - Aggressive Python optimization: * Remove __pycache__, *.pyc, *.pyo files * Strip Babel locale data (31.4MB → 640KB, keeping only en_*) * Remove test directories and pip/setuptools from site-packages - Virtual build dependencies pattern (gcc/g++/musl-dev cleaned after Jupyter install) - Move curl to intermediate-builder stage only (not in final image) - Optimize COPY with --chown to eliminate extra chown layer - Architecture-specific coursier binaries: * amd64: Official musl static build (v2.1.24) * arm64: VirtusLab glibc build (v2.1.24) with gcompat layer - Enhanced .dockerignore to exclude dev artifacts Results: - Image size: 1.305GB → 549.8MB (57.9% reduction) - Architecture: linux/amd64, linux/arm64 validated - Functionality: All notebooks work, GraphViz rendering verified Known limitations: - Jupyter authentication disabled (intentional for local dev, see source/jupyter_server_config.py) - Python 3.12 paths hardcoded (will need update on Alpine Python updates) - Scala 2.12.10 + Almond 0.9.1 (newer versions require source changes per patch)
CI failed with "libz.so.1: cannot open shared object file" because x86_64 coursier binary (cs-x86_64-pc-linux.gz) is glibc-linked with relocation types (R_X86_64_GOTPCREL, R_X86_64_GOTOFF64) and symbols (__strtok_r, __strdup) that Alpine's gcompat cannot handle. - x86_64: Use cs-x86_64-pc-linux-static.gz (static musl binary, zero deps) - ARM64: Keep glibc installation (VirtusLab binary still requires it) - Simplify x86_64 path by removing glibc/gcompat/zlib dependencies - Move curl to coursier download RUN (needed by both architectures)
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Migrated Docker base from Ubuntu (eclipse-temurin:11-jre-noble) to Alpine Linux 3.22, achieving 57.9% image size reduction (1.305GB → 549.8MB) while maintaining full functionality.
Infrastructure
eclipse-temurin:11-jre-noble→alpine:3.22linux/amd64andlinux/arm64via BuildKitSize Optimization
__pycache__,*.pyc,*.pyofilesen_*androot.dat)tests/andtesting/from site-packages--chownon COPYMulti-Architecture Support
Build Improvements
gcc,g++,musl-devcleaned after use).dockerignoreto exclude dev artifactsCOURSIER_VERSION=2.1.24)Results