Examples for how to set up continuwuity in docker.

2026-03-18 14:54:02 +01:00
parent dff894821b
commit b21fa9bb40
5 changed files with 582 additions and 0 deletions
--- a/continuwuity/README.md
+++ b/continuwuity/README.md
@@ -0,0 +1,238 @@
+# Matrix Self-Hosted Stack — Setup Guide
+
+## File Overview
+
+```
+matrix-stack/
+├── docker-compose.yml    # All services: Continuwuity, Traefik, Coturn, LiveKit, lk-jwt-service
+├── continuwuity.toml     # Homeserver config: TURN URIs, LiveKit foci
+├── livekit.yaml          # LiveKit media server config
+├── coturn.conf           # TURN/STUN server config
+└── README.md             # This file
+```
+
+---
+
+## Prerequisites
+
+1. Two DNS A records pointing to your server's public IP:
+   - `matrix.example.com`
+   - `livekit.example.com`
+   (If you want your Matrix IDs as `@user:example.com` rather than
+   `@user:matrix.example.com`, also point `example.com` to your server.)
+
+2. Docker + Docker Compose installed.
+
+3. Create the external proxy network Traefik uses:
+   ```bash
+   docker network create proxy
+   ```
+
+---
+
+## One-Time Secret Generation
+
+### Coturn secret
+```bash
+# Install pwgen if needed: apt install pwgen
+pwgen -s 64 1
+```
+Paste the output into both `coturn.conf` (static-auth-secret)
+and `continuwuity.toml` (turn_secret). They MUST match.
+
+### LiveKit keys
+```bash
+docker run --rm livekit/livekit-server:latest generate-keys
+```
+This outputs a key (~20 chars) and secret (~64 chars).
+Paste them into:
+- `livekit.yaml`  → keys section
+- `docker-compose.yml` → lk-jwt-service LIVEKIT_KEY / LIVEKIT_SECRET
+
+### Registration token (for invite-only signup)
+```bash
+pwgen -s 32 1
+```
+Paste into docker-compose.yml → CONTINUWUITY_REGISTRATION_TOKEN.
+
+---
+
+## Starting Up
+
+```bash
+# First boot — creates admin user automatically
+docker compose up -d
+
+# Get your admin password
+docker compose logs homeserver | grep "Created user"
+
+# IMPORTANT: Edit docker-compose.yml and remove the --execute flag
+# from the homeserver command, then restart:
+docker compose up -d homeserver
+```
+
+Log in with any Matrix client (Element, Cinny, etc.) using
+`@admin:example.com` and the generated password.
+
+---
+
+## Firewall Rules
+
+Open these ports on your server's firewall (ufw examples shown).
+
+### HTTP/HTTPS — handled by Traefik
+```bash
+ufw allow 80/tcp     # HTTP (redirected to HTTPS by Traefik)
+ufw allow 443/tcp    # HTTPS for matrix.example.com and livekit.example.com
+```
+
+### Coturn — TURN/STUN (raw UDP/TCP, NOT proxied by Traefik)
+```bash
+ufw allow 3478/tcp   # STUN + TURN
+ufw allow 3478/udp
+ufw allow 5349/tcp   # TURN over TLS (if you configured TLS in coturn.conf)
+ufw allow 5349/udp
+ufw allow 50201:65535/udp   # Coturn media relay port range
+```
+
+### LiveKit — RTC media (raw UDP/TCP, NOT proxied by Traefik)
+```bash
+ufw allow 7881/tcp           # LiveKit direct TCP (for clients that can't UDP)
+ufw allow 50100:50200/udp    # LiveKit media relay port range
+```
+
+### Summary table
+
+| Port(s)         | Protocol  | Service            | Via Traefik? |
+|----------------|-----------|--------------------|--------------|
+| 80             | TCP       | HTTP (→ HTTPS)     | Yes          |
+| 443            | TCP       | HTTPS              | Yes          |
+| 3478           | TCP + UDP | Coturn TURN/STUN   | No — direct  |
+| 5349           | TCP + UDP | Coturn TURN TLS    | No — direct  |
+| 7881           | TCP       | LiveKit direct TCP | No — direct  |
+| 50100–50200    | UDP       | LiveKit media      | No — direct  |
+| 50201–65535    | UDP       | Coturn media relay | No — direct  |
+
+**Key point**: Traefik only handles ports 80 and 443. The Matrix
+homeserver (6167) and LiveKit HTTP (7880) are never exposed directly
+— Traefik proxies them internally. Coturn and LiveKit's RTC ports
+bypass Traefik entirely and are opened directly to the internet.
+
+---
+
+## Can I use an External NGINX Proxy Manager instead of Traefik?
+
+**Short answer: yes, but with important caveats.**
+
+### What NPM can handle
+- `matrix.example.com` → proxy to `http://YOUR_SERVER_IP:6167`
+  - Enable WebSockets
+  - Set `X-Forwarded-For`, `Host`, `X-Real-IP` headers
+- `livekit.example.com` with path splitting:
+  - `/sfu/get`, `/healthz`, `/get_token` → `http://YOUR_SERVER_IP:8081`
+  - Everything else → `http://YOUR_SERVER_IP:7880`
+  - Enable WebSockets on both
+- NPM handles Let's Encrypt TLS automatically
+
+### What NPM cannot handle
+- **Coturn** — raw UDP/TCP, not HTTP. NPM (like Traefik) can't proxy it.
+  You just open ports 3478/5349 directly and point DNS at your server IP.
+- **LiveKit RTC ports** (7881/tcp, 50100-50200/udp) — same story.
+  These bypass any reverse proxy entirely.
+
+### Changes needed to docker-compose.yml for NPM
+
+1. **Remove the entire `traefik:` service block.**
+
+2. **Remove all `labels:` blocks** from homeserver and lk-jwt-service.
+
+3. **Expose the ports NPM needs to reach:**
+   ```yaml
+   homeserver:
+     ports:
+       - "127.0.0.1:6167:6167"   # NPM proxies this
+
+   lk-jwt-service:
+     ports:
+       - "127.0.0.1:8081:8081"   # NPM proxies this
+
+   # livekit already uses network_mode: host, so 7880 is available
+   # on the host at 127.0.0.1:7880 automatically
+   ```
+   Using `127.0.0.1:` prefix means only NPM (on the same host or
+   your network) can reach them — not the open internet.
+
+4. **Remove the `acme:` volume** (NPM handles TLS).
+
+5. In NPM, configure two proxy hosts:
+
+   **matrix.example.com**
+   - Forward to: `http://YOUR_SERVER_IP:6167`
+   - Websockets: ON
+   - Custom nginx config:
+     ```nginx
+     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+     proxy_set_header X-Real-IP $remote_addr;
+     proxy_set_header Host $http_host;
+     ```
+
+   **livekit.example.com**
+   - Forward to: `http://YOUR_SERVER_IP:7880` (default)
+   - Websockets: ON
+   - Advanced tab — add this custom config for path splitting:
+     ```nginx
+     location ~ ^/(sfu/get|healthz|get_token) {
+         proxy_pass http://YOUR_SERVER_IP:8081$request_uri;
+         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+         proxy_set_header X-Real-IP $remote_addr;
+         proxy_set_header Host $http_host;
+         proxy_buffering off;
+     }
+     ```
+
+### NPM on a separate machine?
+If NPM runs on a different server, replace `127.0.0.1` with your
+Matrix server's internal IP, and make sure port 6167 is firewalled
+to only allow connections from NPM's IP.
+
+---
+
+## Verification
+
+### Test TURN credentials
+```bash
+curl "https://matrix.example.com/_matrix/client/r0/voip/turnServer" \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" | jq
+```
+Should return a JSON object with `uris`, `username`, `password`.
+
+### Test TURN connectivity
+1. Go to https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/
+2. Paste the credentials from above
+3. Click "Gather candidates" — look for `relay` type candidates
+
+### Test LiveKit
+1. GET `https://livekit.example.com/healthz` — should return 200
+2. Use https://livekit.io/connection-test with a token from `/get_token`
+
+### Test federation
+https://federationtester.matrix.org — enter your domain
+
+---
+
+## Troubleshooting
+
+**Federation not working**
+- Check `.well-known/matrix/server` is reachable:
+  `curl https://example.com/.well-known/matrix/server`
+- Should return: `{"m.server":"matrix.example.com:443"}`
+
+**TURN not working**
+- Verify firewall allows 3478/udp from the internet
+- Check coturn logs: `docker compose logs coturn`
+- Confirm `turn_secret` in continuwuity.toml matches `static-auth-secret` in coturn.conf
+
+**Element Call / group calls failing**
+- Check lk-jwt-service is reachable: `curl https://livekit.example.com/healthz`
+- Confirm LiveKit UDP ports (50100-50200) are open
+- Check `foci` URL in continuwuity.toml matches where lk-jwt-service is deployed
--- a/continuwuity/continuwuity.toml
+++ b/continuwuity/continuwuity.toml
@@ -0,0 +1,45 @@
+# ============================================================
+#  continuwuity.toml — Continuwuity Homeserver Configuration
+#  Mount this at /etc/continuwuity.toml in the container.
+#
+#  Most settings are handled via environment variables in
+#  docker-compose.yml. This file handles things that are
+#  easier to express in TOML: TURN and MatrixRTC config.
+# ============================================================
+
+[global]
+
+# ------------------------------------------------------------
+#  TURN / STUN — for legacy 1:1 voice and video calls
+#  Uses shared secret auth (time-limited credentials, more secure
+#  than static username/password).
+#  The turn_secret MUST match static-auth-secret in coturn.conf.
+# ------------------------------------------------------------
+turn_uris = [
+    "turn:matrix.example.com?transport=udp",
+    "turn:matrix.example.com?transport=tcp",
+    "turns:matrix.example.com?transport=udp",   # TURN over TLS (port 5349)
+    "turns:matrix.example.com?transport=tcp"
+]
+
+# Must match `static-auth-secret` in coturn.conf
+turn_secret = "YOUR_COTURN_SECRET"   # EDIT THIS
+
+# How long TURN credentials are valid (seconds). 24h default.
+turn_ttl = 86400
+
+# Set to true only if you want unauthenticated/guest users to
+# be able to use TURN. Not recommended — leaves TURN open to abuse.
+turn_allow_guests = false
+
+
+# ------------------------------------------------------------
+#  MatrixRTC / Element Call — group calls via LiveKit
+#  Clients discover the LiveKit endpoint via the
+#  /_matrix/client/v1/rtc/transports API (MSC4143).
+#  The URL here points to your lk-jwt-service, NOT LiveKit directly.
+# ------------------------------------------------------------
+[global.matrix_rtc]
+foci = [
+    { type = "livekit", livekit_service_url = "https://livekit.example.com" },
+]
--- a/continuwuity/coturn.conf
+++ b/continuwuity/coturn.conf
@@ -0,0 +1,51 @@
+# ============================================================
+#  coturn.conf — Coturn TURN/STUN Server Configuration
+#  Mount this at /etc/coturn/turnserver.conf in the container.
+#
+#  Generate a secret with:  pwgen -s 64 1
+#  The secret here MUST match turn_secret in continuwuity.toml.
+# ============================================================
+
+# Use time-limited shared-secret auth (more secure than static credentials)
+use-auth-secret
+static-auth-secret=YOUR_COTURN_SECRET   # EDIT THIS — must match continuwuity.toml
+
+# realm should match your Matrix domain
+realm=matrix.example.com   # EDIT THIS
+
+# ------------------------------------------------------------
+#  Port ranges
+#  Default coturn range is 49152-65535.
+#  We start at 50201 so it doesn't overlap with LiveKit (50100-50200).
+# ------------------------------------------------------------
+min-port=50201
+max-port=65535
+
+# ------------------------------------------------------------
+#  Optional: TLS support (recommended for production)
+#  You'll need to provide certificates. One approach is to copy
+#  them from your Let's Encrypt store (requires a cron/hook).
+#  Comment these out if you're not setting up TLS on coturn.
+# ------------------------------------------------------------
+# tls-listening-port=5349
+# cert=/etc/coturn/certs/fullchain.pem
+# pkey=/etc/coturn/certs/privkey.pem
+
+# ------------------------------------------------------------
+#  Security hardening
+#  Prevents coturn from being used as an open relay/proxy.
+# ------------------------------------------------------------
+# Deny connections to private/loopback IP ranges (prevents SSRF)
+denied-peer-ip=10.0.0.0-10.255.255.255
+denied-peer-ip=192.168.0.0-192.168.255.255
+denied-peer-ip=172.16.0.0-172.31.255.255
+denied-peer-ip=127.0.0.0-127.255.255.255
+
+# Only allow relay to public IPs
+no-multicast-peers
+
+# Disable the web admin interface (not needed, reduces attack surface)
+no-cli
+
+# Log to stdout so Docker captures it
+log-file=stdout
--- a/continuwuity/docker-compose.yml
+++ b/continuwuity/docker-compose.yml
@@ -0,0 +1,180 @@
+# ============================================================
+#  Matrix Self-Hosted Stack
+#  Services: Continuwuity, Coturn, LiveKit, lk-jwt-service
+#
+#  Domains (replace throughout):
+#    matrix.example.com  — homeserver
+#    livekit.example.com — LiveKit + JWT service
+#
+#  Before starting:
+#    1. Fill in all YOUR_* placeholders
+#    2. Set your email for Let's Encrypt
+#    3. Run: docker network create proxy
+#    4. Then: docker compose up -d
+#    5. Grab admin password: docker compose logs homeserver | grep "Created user"
+#    6. Remove the --execute flag from homeserver command after first boot
+# ============================================================
+
+services:
+
+  # ----------------------------------------------------------
+  #  Traefik — Reverse Proxy & TLS termination
+  #  Handles HTTPS for matrix.example.com and livekit.example.com
+  #  Does NOT handle coturn (raw UDP/TCP, not HTTP)
+  # ----------------------------------------------------------
+  traefik:
+    image: traefik:latest
+    container_name: traefik
+    restart: unless-stopped
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+      - acme:/etc/traefik/acme
+    environment:
+      TRAEFIK_LOG_LEVEL: INFO
+      TRAEFIK_ENTRYPOINTS_WEB_ADDRESS: ":80"
+      TRAEFIK_ENTRYPOINTS_WEB_HTTP_REDIRECTIONS_ENTRYPOINT_TO: websecure
+      TRAEFIK_ENTRYPOINTS_WEBSECURE_ADDRESS: ":443"
+      TRAEFIK_ENTRYPOINTS_WEBSECURE_HTTP_TLS_CERTRESOLVER: letsencrypt
+      # Allow encoded characters needed by Matrix
+      TRAEFIK_ENTRYPOINTS_WEBSECURE_HTTP_ENCODEDCHARACTERS_ALLOWENCODEDSLASH: "true"
+      TRAEFIK_ENTRYPOINTS_WEBSECURE_HTTP_ENCODEDCHARACTERS_ALLOWENCODEDHASH: "true"
+      TRAEFIK_CERTIFICATESRESOLVERS_LETSENCRYPT: "true"
+      TRAEFIK_CERTIFICATESRESOLVERS_LETSENCRYPT_ACME_EMAIL: "you@example.com"  # EDIT THIS
+      TRAEFIK_CERTIFICATESRESOLVERS_LETSENCRYPT_ACME_KEYTYPE: EC384
+      TRAEFIK_CERTIFICATESRESOLVERS_LETSENCRYPT_ACME_HTTPCHALLENGE: "true"
+      TRAEFIK_CERTIFICATESRESOLVERS_LETSENCRYPT_ACME_HTTPCHALLENGE_ENTRYPOINT: web
+      TRAEFIK_CERTIFICATESRESOLVERS_LETSENCRYPT_ACME_STORAGE: /etc/traefik/acme/acme.json
+      TRAEFIK_PROVIDERS_DOCKER: "true"
+      TRAEFIK_PROVIDERS_DOCKER_EXPOSEDBYDEFAULT: "false"
+    networks:
+      - proxy
+
+  # ----------------------------------------------------------
+  #  Continuwuity — Matrix Homeserver
+  # ----------------------------------------------------------
+  homeserver:
+    image: forgejo.ellis.link/continuwuation/continuwuity:latest
+    container_name: continuwuity
+    restart: unless-stopped
+    # Remove the --execute flag after first boot once you have your admin password
+    command: /sbin/conduwuit --execute "users create-user admin"
+    depends_on:
+      - traefik
+    volumes:
+      - db:/var/lib/continuwuity
+      - ./continuwuity.toml:/etc/continuwuity.toml:ro
+      # Use host DNS to avoid Docker's resolver causing federation issues
+      - /etc/resolv.conf:/etc/resolv.conf:ro
+    networks:
+      - proxy
+    labels:
+      - "traefik.enable=true"
+      # Serve matrix.example.com AND well-known paths on example.com for delegation
+      - "traefik.http.routers.continuwuity.rule=(Host(`matrix.example.com`) || (Host(`example.com`) && PathPrefix(`/.well-known/matrix`)))"
+      - "traefik.http.routers.continuwuity.entrypoints=websecure"
+      - "traefik.http.routers.continuwuity.tls.certresolver=letsencrypt"
+      - "traefik.http.services.continuwuity.loadbalancer.server.port=6167"
+    environment:
+      CONTINUWUITY_SERVER_NAME: "example.com"        # Your Matrix ID domain (@user:example.com)
+      CONTINUWUITY_DATABASE_PATH: /var/lib/continuwuity
+      CONTINUWUITY_ADDRESS: 0.0.0.0
+      CONTINUWUITY_PORT: 6167
+      CONTINUWUITY_MAX_REQUEST_SIZE: "20000000"       # ~20 MB
+      CONTINUWUITY_ALLOW_REGISTRATION: "false"        # Enable with a token for invite-only
+      CONTINUWUITY_REGISTRATION_TOKEN: "YOUR_INVITE_TOKEN"  # EDIT THIS
+      CONTINUWUITY_ALLOW_FEDERATION: "true"
+      CONTINUWUITY_ALLOW_CHECK_FOR_UPDATES: "true"
+      CONTINUWUITY_TRUSTED_SERVERS: '["matrix.org"]'
+      CONTINUWUITY_CONFIG: /etc/continuwuity.toml
+      # Well-known delegation so clients and servers find your homeserver
+      CONTINUWUITY_WELL_KNOWN: |
+        {
+          client=https://matrix.example.com,
+          server=matrix.example.com:443
+        }
+    ulimits:
+      nofile:
+        soft: 1048567
+        hard: 1048567
+
+  # ----------------------------------------------------------
+  #  Coturn — TURN/STUN server for legacy 1:1 calls
+  #  Uses host networking — Traefik does NOT proxy this.
+  #  Reachable directly on the host IP via UDP/TCP ports 3478/5349
+  #  and the relay port range 50201-65535.
+  # ----------------------------------------------------------
+  coturn:
+    image: coturn/coturn:latest
+    container_name: coturn
+    restart: unless-stopped
+    network_mode: host
+    volumes:
+      - ./coturn.conf:/etc/coturn/turnserver.conf:ro
+
+  # ----------------------------------------------------------
+  #  LiveKit — Media server for MatrixRTC / Element Call
+  #  Also uses host networking for RTC performance.
+  #  Traefik proxies HTTP/WS on port 7880 via livekit.example.com.
+  # ----------------------------------------------------------
+  livekit:
+    image: livekit/livekit-server:latest
+    container_name: livekit
+    restart: unless-stopped
+    command: --config /etc/livekit.yaml
+    network_mode: host
+    volumes:
+      - ./livekit.yaml:/etc/livekit.yaml:ro
+    # Note: with network_mode: host, Traefik cannot directly label this container.
+    # The livekit.example.com routing is handled via the lk-jwt-service container
+    # labels, with LiveKit itself accessed at 127.0.0.1:7880 from that container's
+    # perspective. See lk-jwt-service labels below.
+
+  # ----------------------------------------------------------
+  #  lk-jwt-service — Issues JWT tokens for LiveKit
+  #  Matrix users authenticate here before joining calls.
+  #  Traefik routes livekit.example.com here, with path-based
+  #  splitting: /sfu/get, /healthz, /get_token go to this service;
+  #  everything else is reverse-proxied onward to LiveKit on :7880.
+  # ----------------------------------------------------------
+  lk-jwt-service:
+    image: ghcr.io/element-hq/lk-jwt-service:latest
+    container_name: lk-jwt-service
+    restart: unless-stopped
+    environment:
+      - LIVEKIT_JWT_BIND=:8081
+      - LIVEKIT_URL=wss://livekit.example.com        # EDIT: your LiveKit domain
+      - LIVEKIT_KEY=YOUR_LK_KEY                       # EDIT: from generate-keys
+      - LIVEKIT_SECRET=YOUR_LK_SECRET                 # EDIT: from generate-keys
+      - LIVEKIT_FULL_ACCESS_HOMESERVERS=example.com   # EDIT: your Matrix domain
+    ports:
+      - "127.0.0.1:8081:8081"   # Only bind to localhost; Traefik reaches it here
+    networks:
+      - proxy
+    labels:
+      - "traefik.enable=true"
+      # High-priority rule: JWT paths go to lk-jwt-service
+      - "traefik.http.routers.livekit-jwt.rule=Host(`livekit.example.com`) && (PathPrefix(`/sfu/get`) || PathPrefix(`/healthz`) || PathPrefix(`/get_token`))"
+      - "traefik.http.routers.livekit-jwt.entrypoints=websecure"
+      - "traefik.http.routers.livekit-jwt.tls.certresolver=letsencrypt"
+      - "traefik.http.routers.livekit-jwt.priority=10"
+      - "traefik.http.services.livekit-jwt.loadbalancer.server.port=8081"
+      # Low-priority rule: everything else on livekit.example.com goes to LiveKit itself
+      - "traefik.http.routers.livekit.rule=Host(`livekit.example.com`)"
+      - "traefik.http.routers.livekit.entrypoints=websecure"
+      - "traefik.http.routers.livekit.tls.certresolver=letsencrypt"
+      - "traefik.http.routers.livekit.priority=1"
+      - "traefik.http.services.livekit.loadbalancer.server.url=http://127.0.0.1:7880"
+
+# ----------------------------------------------------------
+#  Volumes & Networks
+# ----------------------------------------------------------
+volumes:
+  db:
+  acme:
+
+networks:
+  proxy:
+    external: true
--- a/continuwuity/livekit.yaml
+++ b/continuwuity/livekit.yaml
@@ -0,0 +1,68 @@
+# ============================================================
+#  livekit.yaml — LiveKit Media Server Configuration
+#  Mount this at /etc/livekit.yaml in the livekit container.
+#
+#  Replace LK_MATRIX_KEY and LK_MATRIX_SECRET with the values
+#  generated by:
+#    docker run --rm livekit/livekit-server:latest generate-keys
+# ============================================================
+
+# HTTP/WebSocket port (proxied by Traefik)
+port: 7880
+
+# Bind to all interfaces (Traefik reaches it on 127.0.0.1:7880
+# since both livekit and the host share the network stack)
+bind_addresses:
+  - ""
+
+rtc:
+  # Direct TCP port for clients that can't use UDP
+  tcp_port: 7881
+
+  # UDP port range for media relay
+  # Starts at 50100 to leave room below for coturn if needed.
+  # Coturn is configured with min-port=50201 to avoid overlap.
+  port_range_start: 50100
+  port_range_end: 50200
+
+  # Required when running behind NAT — LiveKit advertises your
+  # public IP to clients rather than the internal Docker IP
+  use_external_ip: true
+
+  # Disable loopback candidates — not useful in production
+  enable_loopback_candidate: false
+
+  # Optional: Use your coturn server as a TURN relay for LiveKit.
+  # This improves connectivity for clients behind strict firewalls.
+  # Uncomment and fill in if you want LiveKit to use coturn:
+  #
+  # turn_servers:
+  #   - host: matrix.example.com
+  #     port: 3478
+  #     protocol: udp
+  #     secret: "YOUR_COTURN_SECRET"   # Same secret as coturn.conf
+  #   - host: matrix.example.com
+  #     port: 3478
+  #     protocol: tcp
+  #     secret: "YOUR_COTURN_SECRET"
+  #   - host: matrix.example.com
+  #     port: 5349
+  #     protocol: tls
+  #     secret: "YOUR_COTURN_SECRET"
+
+# API keys — must match LIVEKIT_KEY and LIVEKIT_SECRET
+# in the lk-jwt-service environment variables
+keys:
+  YOUR_LK_KEY: YOUR_LK_SECRET   # EDIT BOTH OF THESE
+
+# Optional: enable LiveKit's built-in TURN server.
+# Only useful for LiveKit connections — cannot be used by coturn
+# or legacy Matrix calls. Use this if you don't want a separate
+# coturn deployment and only care about group calls.
+#
+# turn:
+#   enabled: true
+#   udp_port: 3478
+#   relay_range_start: 50300
+#   relay_range_end: 50400
+#   domain: livekit.example.com