Oier Bravo Urtasun
c7151b7333
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>
33 lines
1.1 KiB
Bash
Executable File
33 lines
1.1 KiB
Bash
Executable File
#!/bin/sh
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# Publish A records for the stack's service names on .local via the HOST's
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# avahi-daemon (reached over its mounted D-Bus socket). One avahi-publish per
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# name; if any drops the container exits so Docker restarts it.
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set -eu
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: "${BASE_DOMAIN:?BASE_DOMAIN unset}"
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: "${HOST_LAN_IP:?HOST_LAN_IP unset}"
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case "$BASE_DOMAIN" in
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*.local) ;;
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*) echo "WARN: mDNS resolves only .local — BASE_DOMAIN=$BASE_DOMAIN will NOT be discoverable via avahi. Set BASE_DOMAIN=*.local to use mDNS." >&2 ;;
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esac
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bus="${DBUS_SYSTEM_BUS_ADDRESS:-unix:path=/run/dbus/system_bus_socket}"
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sock=${bus#unix:path=}
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if [ ! -S "$sock" ]; then
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echo "ERROR: host D-Bus socket '$sock' not found. Mount the host's" >&2
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echo " /run/dbus/system_bus_socket and ensure avahi-daemon runs on the host." >&2
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exit 1
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fi
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export DBUS_SYSTEM_BUS_ADDRESS="$bus"
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pids=""
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for n in "$BASE_DOMAIN" "auth.$BASE_DOMAIN" "packwiz.$BASE_DOMAIN" "mc.$BASE_DOMAIN"; do
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echo "mDNS publish (host avahi): $n -> $HOST_LAN_IP"
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avahi-publish -a "$n" "$HOST_LAN_IP" &
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pids="$pids $!"
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done
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# shellcheck disable=SC2086
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wait -n $pids 2>/dev/null || wait
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