asmhatreandClaude Opus 5
644da9e65e
Companion code for "Dockerizing Spring Boot 4: Layered Jars, Buildpacks, Distroless and Image Size Benchmarks". Fat jar on JDK and JRE, layered jar on Debian, Alpine and distroless, jlink, the JDK 25 AOT cache, Paketo buildpacks and Jib, each measured for size on disk and pushed, rebuild delta, startup, user and shell. Also PID 1 and signal handling, the jdeps module gap, AOT cache mismatches and buildpacks memory calculation. Transcripts in docs/output/, regenerated by scripts/run-all.sh. Co-Authored-By: Claude Opus 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01C3TETMrqVUWeFkNtz3Jbo3
33 lines
1.9 KiB
Bash
33 lines
1.9 KiB
Bash
#!/usr/bin/env bash
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# The jlink image built from jdeps' module list alone runs fine - and exports fewer metrics.
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# Diffs /actuator/prometheus metric names against the full-JRE image. -> docs/output/jlink-metrics.txt
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set -uo pipefail
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source "$(dirname "$0")/env.sh"
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names() {
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local name="jl-$$-$2"
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docker rm -f "$name" > /dev/null 2>&1
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docker run -d --name "$name" -p "$2:8080" "$1" > /dev/null
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for _ in $(seq 1 300); do curl -s -o /dev/null "localhost:$2/actuator/health" && break; sleep 0.1; done
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curl -s -o /dev/null "localhost:$2/api/items"
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curl -s "localhost:$2/actuator/prometheus" | grep -v '^#' | sed 's/[{ ].*//' | sort -u
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docker logs "$name" 2>&1 | grep -E ' WARN ' | sed 's/^.* WARN [0-9]* --- \[[^]]*\] \[ *[^]]*\] //' >&2
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docker rm -f "$name" > /dev/null
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}
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{
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echo "# jlink modules chosen by jdeps alone:"
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docker run --rm --entrypoint /opt/jre/bin/java sbd/docker-images:jlink-jdeps-only --list-modules | sed 's/@.*//' | tr '\n' ' '; echo
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echo
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echo "# WARN lines at startup of the jdeps-only image:"
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names sbd/docker-images:jlink-jdeps-only 18101 2>&1 >/tmp/jl-a.txt | sed 's/^/ /'
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names sbd/docker-images:layered-distroless 18102 2>/dev/null > /tmp/jl-b.txt
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names sbd/docker-images:jlink-distroless 18103 2>/dev/null > /tmp/jl-c.txt
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echo
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echo "# Metric names: full JRE $(wc -l < /tmp/jl-b.txt), jdeps-only $(wc -l < /tmp/jl-a.txt), jdeps + jdk.management $(wc -l < /tmp/jl-c.txt)"
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echo "# Present with the full JRE, missing from the jdeps-only image:"
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comm -23 /tmp/jl-b.txt /tmp/jl-a.txt | sed 's/^/ /'
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echo "# Missing from jdeps + jdk.management: $(comm -23 /tmp/jl-b.txt /tmp/jl-c.txt | wc -l)"
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comm -23 /tmp/jl-b.txt /tmp/jl-c.txt | sed 's/^/ /'
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echo "# (jvm_gc_concurrent_phase_time_* is registered lazily, after the first G1 concurrent cycle -"
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echo "# whether it appears within a few seconds of startup varies run to run, in either image.)"
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} | tee "$OUT/jlink-metrics.txt"
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