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harden: run tini as PID 1 for guaranteed zombie reaping 

Defense-in-depth: any process reparented to PID 1 (e.g. a child orphaned by a
program that forks and exits without waiting) is now reaped by tini. supervisord
already reaps its own tree and reparented orphans, so this mirrors the
docker-bastion image as belt-and-suspenders. No -g (tini forwards SIGTERM to
supervisord, preserving its ordered per-program graceful stop); no -s (tini is
already PID 1). tini installs at /usr/bin/tini on the Debian base.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Fabian @ Blax Software 2026-07-02 11:07:10 +02:00
parent 9f63d8e98b
commit fb51d25984
1 changed files with 11 additions and 2 deletions
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@ -26,7 +26,7 @@ RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
# ---------------------------------------------------------------------------
RUN apt-get update && apt-get install -y --no-install-recommends \
gnupg gosu curl wget ca-certificates zip unzip git \
supervisor sqlite3 libcap2-bin python3 pkg-config \
supervisor tini sqlite3 libcap2-bin python3 pkg-config \
# GD
libfreetype6-dev libjpeg62-turbo-dev libpng-dev libwebp-dev \
# PHP extension libs
@ -190,5 +190,14 @@ HEALTHCHECK --interval=30s --timeout=10s --start-period=90s --retries=3 \
# Boot supervisord (php-fpm + nginx + enabled workers) via start-container. This
# MUST stay — without it the base php image's default entrypoint runs php-fpm
# alone (no nginx -> port 80 unserved, no supervisord -> healthcheck fails).
ENTRYPOINT ["start-container"]
#
# tini is PID 1 (not supervisord directly) purely as a defense-in-depth zombie
# reaper: any process reparented to PID 1 — e.g. a child orphaned by a program
# that forks and exits without waiting (the laravel-websockets fork-per-message
# server on restart) — is reaped by tini. supervisord already reaps its own
# tree and reparented orphans, so this is belt-and-suspenders that mirrors the
# docker-bastion image. No `-g`: tini forwards SIGTERM to its direct child
# (supervisord), preserving supervisord's ordered, per-program graceful stop
# (queue stopwaitsecs, etc.). No `-s`: tini is already PID 1.
ENTRYPOINT ["/usr/bin/tini", "--", "start-container"]