With 70+ services sharing a handful of common default ports (emby and
jellyfin both default to 8096, changedetection and frigate both default
to 5000, arm and nextcloud both default to 8080...), nothing previously
checked whether a service's default port was actually free on the host.
Whichever service installed second would silently write a compose file
claiming an already-held port, only failing at `docker compose up` time.
Adds two shared helpers to lib/common.sh:
- port_in_use PORT [PROTO] — true if something's already listening
- find_free_port VARNAME START [PROTO] — scans upward, writes back the
first free port
Every service that publishes a fixed host port now scans before writing
docker-compose.yml, on every install (not just when adding an explicit
additional instance). On a normal single-install host this is a silent
no-op; it only changes behavior when something else already holds the
port.
- The 19 services already given multi-instance support this session had
their port scan moved out of the "add instance" branch to run
unconditionally, since the same collision risk exists on a plain first
install.
- 20 more services with previously-hardcoded ports gained scanning for
the first time: archivebox, arm, calibre-web, changedetection,
drum-rhythm-game, gatus, n8n, nextcloud, onlyoffice, stirling-pdf,
uptimekuma, portainer, iopaint (both GPU/CPU compose branches), koha
(paired), syncthing (paired), wg-easy (paired, plus WG_PORT env so
generated peer configs keep the right Endpoint), homeassistant
(bridge-mode only — host mode can only warn), frigate and
frigate-audio (multi-port stacks, moved together).
- caddy.sh is the deliberate exception: 80/443 stay fixed and only warn
on collision, since silently moving Caddy itself would leave nothing
listening where any client actually looks.
- authelia.sh needs no change — it has no published host port at all.
- Every service's standalone bootstrap fallback (sudo bash services/x.sh
with no sibling files) got the same two helpers duplicated into its
stub block, matching how every other shared helper is already handled
there.
Documents the full pattern in CLAUDE.md's new "Port collision avoidance"
section, including the quoted-heredoc/backtick-escaping gotcha and the
network_mode:host limitation (can only scan ports the app takes as a
configurable env var).
Verified via bash -n on every changed file, plus functional runs seeding
occupied ports for each collision shape used here (single, paired,
multi-port stacks) and confirming the scan/shift and generated
compose/README output are correct — including the emby/jellyfin,
nextcloud/arm, and frigate/changedetection collision scenarios that
originally motivated this.
traccar.sh's caddy_net wiring was fixed to mirror configure_caddy_for_service's
own mode resolution (CADDY_MODE from site config, then a local ~/docker/caddy,
then the legacy CADDY_REMOTE_HOST var) instead of only checking for the local
directory. That same bare directory check was copy-pasted into the caddy_net
wiring of every other Docker service in the repo, so a site with Caddy on a
different box would silently fail to join any of their containers to caddy_net
during setup (or, for homeassistant/koha, only get half the wiring right).
Applied the same fix mechanically across all 37 services using the standard
_CADDY_NET_BLOCK/_CADDY_NET_SECTION pattern (verified identical text via
scripted diff before touching any of them), plus by hand for:
- homeassistant.sh and koha.sh, which use their own differently-shaped
variables (HA_CADDY_NET_LINES / _CADDY_NET_ENTRY) for the same decision
- paintplus.sh and ai-stack.sh, which do a live `docker network connect`
instead of a compose network block
- watchyourlan.sh, whose Caddy note was worded for local-only setups
sms-inbound.sh got more than a mode swap: its Caddy wiring was hand-rolled
(not routed through configure_caddy_for_service) and had no remote-Caddy
path at all — a remote Caddy box would get a misleading "Caddy isn't
installed here" message instead of a snippet. Added
_sms_write_caddy_snippet(), mirroring the snippet-file pattern
configure_caddy_for_service uses everywhere else, and pointed the firewall
gate at the same three-way mode instead of a two-way dir check.
Verified: bash -n across all of services/*.sh, a scripted check that every
touched file has exactly one _CADDY_MODE resolution and no leftover bare
`[ -d "$DOCKER_DIR/caddy" ]` feeding a caddy_net decision, and spot-checked
docker compose config renders (traccar, mattermost) confirming the ${VAR}
interpolation and multi-service usage sites still resolve correctly.
- joplin: self-hosted sync server (PostgreSQL sidecar, APP_BASE_URL from SITE_DOMAIN)
- stirling-pdf: PDF toolkit with optional Authelia SSO (no built-in auth)
- n8n: workflow automation connecting self-hosted services (WEBHOOK_URL from SITE_DOMAIN)
- changedetection: web page change monitoring with playwright-chrome renderer
- archivebox: personal Wayback Machine, initializes data dir at install time
- calibre-web: ebook library UI with Calibre conversion support (linuxserver image)
- homebox: home inventory and asset management
All services follow the standalone bootstrap pattern and support local/remote Caddy.
README.md updated with new services in appropriate group rows.
Claude