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
32 lines
1.8 KiB
Bash
32 lines
1.8 KiB
Bash
#!/usr/bin/env bash
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# Who is PID 1, does SIGTERM reach the JVM, and how long does `docker stop` take?
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# -> docs/output/pid1-and-signals.txt
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set -uo pipefail
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source "$(dirname "$0")/env.sh"
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probe() {
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local tag="$1" name="sig-$$"
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docker rm -f "$name" > /dev/null 2>&1
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docker run -d --name "$name" "sbd/docker-images:$tag" > /dev/null
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for _ in $(seq 1 200); do docker logs "$name" 2>&1 | grep -q 'Started ImagesApplication' && break; sleep 0.1; done
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local pid1
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# NUL-separated argv; translate in the pipe (a shell variable cannot hold NUL bytes)
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pid1=$(docker exec "$name" cat /proc/1/cmdline 2>/dev/null | tr '\0' ' ')
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case "$pid1" in ""|*"exec failed"*) pid1="(image has no cat; ENTRYPOINT is exec form)" ;; esac
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local t0 t1; t0=$(date +%s%N); docker stop "$name" > /dev/null; t1=$(date +%s%N)
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local code; code=$(docker inspect -f '{{.State.ExitCode}}' "$name")
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local graceful; graceful=$(docker logs "$name" 2>&1 | grep -c 'Commencing graceful shutdown' || true)
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printf '%-22s PID 1: %-58s docker stop: %5d ms exit code: %-4s graceful-shutdown log lines: %s\n' \
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"$tag" "${pid1:0:58}" "$(( (t1 - t0) / 1000000 ))" "$code" "$graceful"
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docker rm -f "$name" > /dev/null
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}
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{
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echo "# docker stop sends SIGTERM to PID 1, waits 10 s, then SIGKILL. Exit code 143 = the JVM handled"
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echo "# SIGTERM (128+15). 137 = it was killed (128+9)."
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echo
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for t in layered-jre shell-form shell-form-alpine shell-form-wrapper layered-distroless; do probe "$t"; done
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echo
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echo "# What /bin/sh is in each base image:"
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echo "eclipse-temurin:25-jre -> $(docker run --rm --entrypoint readlink eclipse-temurin:25-jre -f /bin/sh)"
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echo "eclipse-temurin:25-jre-alpine -> $(docker run --rm --entrypoint readlink eclipse-temurin:25-jre-alpine -f /bin/sh)"
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} | tee "$OUT/pid1-and-signals.txt"
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