feat: improve docker compose help, config strategy docs, and README

pos-docker-compose:
- Rewrote usage() with full config strategy explanation, path layout,
  three-layer cascade, and quick-start guide
- Config show now prints the config file path and inline hints
- Config edit creates a commented template and confirms save
- Up output clarifies deploy vs start

README.md:
- Restructured Docker section with compose sub-section
- Added three-layer config strategy table
- Added config keys reference table
- Clearer quick-start flow

DEV.md:
- Restructured compose section with three-layer cascade diagram
- Added path mutability table
- Added full config keys reference

DEV.md

@@ -269,39 +269,53 @@ fi
 
 ## Docker Compose / ScaleTail
 
-The installer clones [ScaleTail](https://github.com/tailscale-dev/ScaleTail) templates to `/usr/local/share/linux_post_install/scale-tail/` — 119+ self-hosted services with a Tailscale sidecar pattern.
+The installer clones [ScaleTail](https://github.com/tailscale-dev/ScaleTail) templates to `/usr/local/share/linux_post_install/scale-tail/` — 119+ self-hosted services with a Tailscale sidecar pattern. Each service gets a `tail-xxxxx.ts.net` URL via `network_mode: service:tailscale`.
 
-### Deployed Layout
+### Config Strategy — Three Layers
+
+Values cascade from least to most specific:
 
 ```
-/usr/local/share/linux_post_install/scale-tail/   # Templates (git repo)
+Template .env          (per-service defaults from ScaleTail)
-└── services/<name>/
+       ↓
-    ├── compose.yaml
+Global config          (~/.config/linux_post_install/compose.env)
-    └── .env
+       ↓
-
+Per-service .env       (/srv/<service>/.env) — created on first deploy, NEVER overwritten
-~/.config/linux_post_install/compose.env           # Global defaults
-
-/srv/<service>/                                    # Active deployment
-    ├── compose.yaml     # Refreshed on update (preserves .env)
-    ├── .env             # Your config — preserved across updates
-    ├── config/
-    └── data/
 ```
 
+On first `pos docker compose up <service>`:
+1. Template `.env` is copied to `/srv/<service>/.env`
+2. Matching keys from global config are filled in
+3. If `TS_AUTHKEY` is still empty, you're prompted to enter it
+4. After that, the per-service `.env` is **never touched** — not even by `update`
+
+### Layout
+
+| Path | Purpose | Mutability |
+|------|---------|------------|
+| `/usr/local/share/linux_post_install/scale-tail/services/<name>/` | ScaleTail templates (git repo) | Read-only |
+| `~/.config/linux_post_install/compose.env` | Your global defaults | Edit via `config set` or `config edit` |
+| `/srv/<service>/` | Active deployment | Per-service `.env` preserved forever |
+
 ### Key Commands
 
 | Command | Behaviour |
 |---------|-----------|
-| `pos docker compose up <service>` | Deploys to `$SERVICES_BASE/<service>/`, creates `config/` + `data/`, generates `.env` |
+| `pos docker compose up <service>` | Deploys to `$SERVICES_BASE/<service>/`, creates `config/` + `data/`, generates `.env` from global defaults |
 | `pos docker compose down <service>` | Stops the stack |
-| `pos docker compose update` | `git pull` templates + refreshes `compose.yaml` for all deployed services |
+| `pos docker compose update` | `git pull` templates + refreshes `compose.yaml` for all deployed services (`.env` untouched) |
-| `pos docker compose config set K=V` | Sets global default in `~/.config/linux_post_install/compose.env` |
+| `pos docker compose config set K=V` | Sets a global default in `~/.config/linux_post_install/compose.env` |
+| `pos docker compose config show` | Displays current global config and `SERVICES_BASE` |
+| `pos docker compose config edit` | Opens global config in `$EDITOR` |
 
-### .env Design
+### Global Config Keys
 
-- **Global config**: `~/.config/linux_post_install/compose.env` — one place for `TS_AUTHKEY`, `TZ`, `DNS_SERVER`, `SERVICES_BASE`
+| Key | Required | Default | Purpose |
-- **Per-service**: `<SERVICES_BASE>/<service>/.env` — generated from template, filled from global config
+|-----|----------|---------|---------|
-- **Updates**: `compose.yaml` refreshes from template but `.env` is never overwritten
+| `TS_AUTHKEY` | Yes | — | Tailscale auth key for sidecar networking |
+| `TZ` | No | `Europe/Amsterdam` | Timezone for services |
+| `DNS_SERVER` | No | `9.9.9.9` | Custom DNS server |
+| `SERVICES_BASE` | No | `/srv` | Root directory for all deployments |
 
 ---
 

README.md

@@ -76,23 +76,63 @@ pos network scan 192.168.8.0/24              # Fast parallel ping sweep
 ```bash
 pos docker ps                                # List containers with health, IPs, ports
 pos docker health                            # Health dashboard (exits 1 if unhealthy)
-pos docker compose ls                        # List 119+ available services
-pos docker compose up jellyfin               # Deploy with Tailscale HTTPS
-pos docker compose down actual-budget        # Stop a stack
-pos docker compose logs home-assistant -f    # Tail logs
-pos docker compose update                    # Pull latest templates
-pos docker compose config set TS_AUTHKEY=x   # Set global defaults
 ```
 
-**First run with compose:**
+#### Compose (ScaleTail — 119+ self-hosted services)
+
+Each service runs with a Tailscale sidecar and gets its own `tail-xxxxx.ts.net` URL.
+
+**Quick start:**
 
 ```bash
+# 1. Set your Tailscale auth key (required once)
 pos docker compose config set TS_AUTHKEY=tskey-auth-xxxxx
+
+# 2. Deploy a service
 pos docker compose up jellyfin
-# Open https://jellyfin.tail-xxxxx.ts.net
+
+# 3. Open https://jellyfin.tail-xxxxx.ts.net
 ```
 
-Services are deployed to `/srv/<service>/` by default.
+**All commands:**
+
+```bash
+pos docker compose ls                        # List available service templates
+pos docker compose installed                 # List deployed services
+pos docker compose up jellyfin               # Deploy or start a service
+pos docker compose down actual-budget        # Stop a service
+pos docker compose logs home-assistant -f    # Tail logs
+pos docker compose restart home-assistant    # Restart a service
+pos docker compose update                    # Pull latest templates + refresh deployed compose files
+pos docker compose config                    # Show current configuration
+pos docker compose config set TZ=Asia/Tokyo  # Set a global default
+pos docker compose config edit               # Open config in editor
+```
+
+**Config strategy — three layers:**
+
+| Layer | File | Purpose |
+|-------|------|---------|
+| Template defaults | `/usr/local/share/linux_post_install/scale-tail/services/<name>/.env` | Per-service defaults from ScaleTail |
+| Global config | `~/.config/linux_post_install/compose.env` | Your defaults — applies to all services |
+| Per-service | `/srv/<service>/.env` | Actual config — created on first deploy, **never overwritten** |
+
+Set global defaults once, then every `up` fills them into the new service's `.env`.
+
+**Paths:**
+
+- Templates: `/usr/local/share/linux_post_install/scale-tail/services/`
+- Deployments: `/srv/<service>/` (configurable via `SERVICES_BASE`)
+- Global config: `~/.config/linux_post_install/compose.env`
+
+**Config keys:**
+
+| Key | What it does |
+|-----|-------------|
+| `TS_AUTHKEY` | Tailscale auth key (required for sidecar networking) |
+| `TZ` | Timezone for the service |
+| `DNS_SERVER` | Custom DNS server |
+| `SERVICES_BASE` | Where services are deployed (default: `/srv`)
 
 ### VBox (disposable Docker containers)
 

bin/pos-docker-compose

@@ -7,24 +7,60 @@ CONFIG_ENV="${HOME}/.config/linux_post_install/compose.env"
 
 usage() {
     cat <<EOF
-Usage:
+Usage: pos docker compose <command> [args]
-  pos docker compose ls                          List available ScaleTail services
+
-  pos docker compose installed                   List deployed services
+Commands:
-  pos docker compose up       <service>          Deploy a service
+  ls                          List all available ScaleTail service templates
-  pos docker compose down     <service>          Stop a service
+  installed                   List services already deployed on this machine
-  pos docker compose restart  <service>          Restart a service
+  up       <service>          Deploy or start a service
-  pos docker compose logs     <service> [-f]     View service logs
+  down     <service>          Stop and remove a deployed service
-  pos docker compose update                      Pull latest ScaleTail + refresh compose files
+  restart  <service>          Restart a running service
-  pos docker compose config                      Show global config
+  logs     <service> [-f]     View logs (use -f to follow)
-  pos docker compose config set KEY=VALUE        Set a global config value
+  update                      Pull latest ScaleTail templates + refresh all deployed compose files
-  pos docker compose config edit                 Open global config in editor
+  config                      Show current global configuration
-  -h, --help                                     Show this help
+  config set KEY=VALUE        Set a global default (e.g. TS_AUTHKEY, TZ, SERVICES_BASE)
+  config edit                 Open global config in your editor (\$EDITOR)
+
+─── Config Strategy ──────────────────────────────────────────
+
+  Three layers — each overrides the one above:
+
+  1. Template defaults
+     /usr/local/share/linux_post_install/scale-tail/services/<name>/.env
+
+  2. Global config (your defaults — set once, applies to all services)
+     ~/.config/linux_post_install/compose.env
+     Keys: TS_AUTHKEY | TZ | DNS_SERVER | SERVICES_BASE
+
+  3. Per-service config (created on first deploy, preserved forever)
+     /srv/<service>/.env       (or \$SERVICES_BASE/<service>/.env)
+
+  On first "up", the service .env is generated from the template
+  and filled with values from your global config. After that, the
+  per-service .env is never overwritten — even by "update".
+
+─── Paths ────────────────────────────────────────────────────
+
+  Templates:    /usr/local/share/linux_post_install/scale-tail/services/
+  Deployments:  \$SERVICES_BASE/<service>/   (default: /srv/<service>/)
+  Global conf:  ~/.config/linux_post_install/compose.env
+
+─── Quick Start ──────────────────────────────────────────────
+
+  1. Set your Tailscale auth key (required):
+     pos docker compose config set TS_AUTHKEY=tskey-auth-xxxxx
+
+  2. Deploy a service:
+     pos docker compose up jellyfin
+
+  3. Open https://jellyfin.tail-xxxxx.ts.net
 
 Examples:
   pos docker compose up jellyfin
   pos docker compose down actual-budget
   pos docker compose logs home-assistant -f
-  pos docker compose config set TS_AUTHKEY=tskey-auth-xxxxx
+  pos docker compose config set TZ=Asia/Tokyo
+  pos docker compose config set SERVICES_BASE=/data
 EOF
     exit 0
 }
@@ -122,7 +158,7 @@ cmd_up() {
     target=$(service_dir "$svc")
 
     if [ ! -d "$target" ]; then
-        log "Creating $svc at $target"
+        log "Deploying $svc to $target"
         mkdir -p "$target/config" "$target/data"
         if [ -f "$SCALE_DIR/$svc/compose.yaml" ]; then
             cp "$SCALE_DIR/$svc/compose.yaml" "$target/"
@@ -249,16 +285,17 @@ cmd_config() {
     case "$action" in
         show)
             load_global_config
+            echo "${CYAN}Global compose config${RESET}"
+            echo "${DIM}File: $CONFIG_ENV${RESET}"
+            echo "${BLUE}────────────────────────────────────────${RESET}"
             if [ -f "$CONFIG_ENV" ]; then
-                echo "${CYAN}Global compose config:${RESET}"
-                echo "${BLUE}────────────────────────────────────────${RESET}"
                 cat "$CONFIG_ENV"
-                echo "${BLUE}────────────────────────────────────────${RESET}"
-                echo "SERVICES_BASE=$SERVICES_BASE"
             else
-                warn "No config file found at $CONFIG_ENV"
+                echo "(no global config set — using defaults)"
-                echo "Default SERVICES_BASE=/srv"
             fi
+            echo "${BLUE}────────────────────────────────────────${RESET}"
+            echo "SERVICES_BASE=$SERVICES_BASE    (deployment directory)"
+            echo "${DIM}Set with: pos docker compose config set SERVICES_BASE=/srv${RESET}"
             ;;
         set)
             local pair="${1:-}"
@@ -277,13 +314,18 @@ cmd_config() {
             mkdir -p "$(dirname "$CONFIG_ENV")"
             if [ ! -f "$CONFIG_ENV" ]; then
                 cat > "$CONFIG_ENV" <<-EOF
+# Linux_post_install — global Docker Compose config
+# Each key is optional; empty values prompt on first deploy.
 TS_AUTHKEY=
 TZ=Europe/Amsterdam
 DNS_SERVER=9.9.9.9
 SERVICES_BASE=/srv
 EOF
+                log "Created default config at $CONFIG_ENV"
             fi
+            log "Opening $CONFIG_ENV in ${EDITOR:-nano}..."
             "${EDITOR:-nano}" "$CONFIG_ENV"
+            log "Config saved"
             ;;
         *)
             usage