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fix(mdns): publish via host avahi over D-Bus (not a second daemon)

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A container running its own avahi-daemon collides with the host's on :5353.
Instead publish to the host avahi over its mounted D-Bus socket using avahi-tools
(avahi-publish). Needs apparmor=unconfined (docker-default blocks the D-Bus
publish). Documented host prereqs incl. allow-interfaces for multi-bridge hosts.

Tested: publish reaches host avahi and registers the names; on hosts with many
docker bridges avahi self-collides until restricted to the LAN interface.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Oier Bravo
2026-05-24 06:03:26 +02:00
parent de75a2ca1d
commit c7151b7333
3 changed files with 35 additions and 20 deletions
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9
docker/avahi/Dockerfile
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@@ -1,8 +1,9 @@
# Self-contained mDNS responder: publishes the stack's service names on .local
# so guests resolve them with zero DNS/client config (macOS/Linux native;
# Windows needs Bonjour). Used only when ENABLE_MDNS=true and BASE_DOMAIN=*.local.
# Publishes the stack's service names on .local via the HOST's avahi-daemon
# (over its D-Bus socket — no second daemon, avoids the :5353 collision).
# Requires the host to run avahi-daemon and the socket to be mounted (see
# docker-compose.avahi.yml). Used when ENABLE_MDNS=true and BASE_DOMAIN=*.local.
FROM alpine:3.20
RUN apk add --no-cache avahi dbus
RUN apk add --no-cache avahi-tools
COPY entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh
ENTRYPOINT ["/entrypoint.sh"]