traefik

Traefik is an open source application proxy to route traffic inside containers, it’s based on 4 based principles

services services to forward traffic to
providers where traefik gets configuration for routing traffic (eg docker)
routes dinamically generated rules
entrypoints where traefik receives traffic to route (eg ports 80,443,UDP,TCP)
middleware middleware to process traffic (login ecc)

Configuration with docker provider

services:
  traefik:
    image: traefik:v3.4
    # Enables the web UI and tells Traefik to listen to docker
    command: --api.insecure=true --providers.docker
    ports:
      # The HTTP port
      - "80:80"
      # The Web UI (enabled by --api.insecure=true)
      - "8080:8080"
    volumes:
      # So that Traefik can listen to the Docker events
      - /var/run/docker.sock:/var/run/docker.sock

  navidrome:
    container_name: navidrome
    image: deluan/navidrome:latest
    restart: unless-stopped
    environment:
      ND_SCANSCHEDULE: 1h
      ND_LOGLEVEL: info
      ND_SESSIONTIMEOUT: 24h
      ND_BASEURL: "/navidrome"
    labels:
	  # entrypoints for this app as http
      - traefik.http.routers.traefik.entrypoints=http
	  # rule for router, forward traffic that starts with /navidrome prefix
      - "traefik.http.routers.navidrome.rule=PathPrefix(`/navidrome`)"
	  # container port to forward traffic to
      - "traefik.http.services.navidrome.loadbalancer.server.port=4533"
	  services:
  # example using host in router rule
  portainer:
    container_name: portainer
    image: portainer/portainer-ce:latest
    restart: unless-stopped
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
    labels:
      - traefik.http.routers.traefik.entrypoints=http
      - "traefik.http.routers.portainer.rule=Host(`portainer.docker.localhost`)"
      - "traefik.http.services.portainer.loadbalancer.server.port=9000"

🔷 files can be separated in multiple docker compose files

labels

Possible labels for routers when using the docker provider can be found here