Using Traefik

I recently came across Traefik. It is a reverse proxy built specifically for services in the cloud. I was searching for a convenient (up-to-date) way to expose my project using a reverse proxy within docker-compose. I used to use nginx for this, but it then requires a generator and an lets encrypt listener (so 3 containers). Traefik only requires a single container and allows you to label your docker containers to apply rules to them.

The below configuration creates a traefik instance, sets it up to host port 80 and 443 for web, and 8080 for its dashboard (protect that port in your firewall). It also sets up letsencrypt certificates and automatic redirection from port 80 to 443.

version: '3'

services:
  reverse-proxy:
    image: traefik:v3.1
    ports:
      - "80:80"
      - "443:443"
      - "8080:8080"
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - ./traefik.yml:/traefik.yml:ro # Traefik config file
      - traefik-certs:/certs # Docker volume to store the acme file for the Certifactes

  app:
    image: your/image
    ports:
      - 8081:8080
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.app-http.rule=Host(`example.com`) || Host(`www.example.com`)"
      - "traefik.http.routers.app-http.entrypoints=web"
      - "traefik.http.routers.app-http.middlewares=redirect-to-https"
      - "traefik.http.routers.app-https.rule=Host(`example.com`) || Host(`www.example.com`)"
      - "traefik.http.routers.app-https.entrypoints=websecure"
      - "traefik.http.routers.app-https.tls=true"
      - "traefik.http.routers.app-https.tls.certresolver=letencrypt"
      - "traefik.http.middlewares.redirect-to-https.redirectscheme.scheme=https"
      - "traefik.http.middlewares.redirect-to-https.redirectscheme.permanent=true"
volumes:
  traefik-certs:
    name: traefik-certs

The mentioned config file is reproduced below:

api:
  dashboard: true # Optional can be disabled
  insecure: true # Optional can be disabled
  debug: false # Optional can be Enabled if needed for troubleshooting
entryPoints:
  web:
    address: ":80"
  websecure:
    address: ":443"
serversTransport:
  insecureSkipVerify: true
providers:
  docker:
    endpoint: "unix:///var/run/docker.sock"
    exposedByDefault: false
    network: proxy # Optional; Only use the "proxy" Docker network, even if containers are on multiple networks.
certificatesResolvers:
  letencrypt:
    acme:
      email: contact@example.com
      storage: /certs/acme.json
      #caServer: https://acme-v02.api.letsencrypt.org/directory # prod (default)
      caServer: https://acme-staging-v02.api.letsencrypt.org/directory # staging
      httpChallenge:
        entryPoint: web