Traefik v2.0 with Cloudflare Wildcard and OpenVPN

docker-compose.yaml

version: "3"

services:
  traefik:
    image: "traefik:v2.0"
    container_name: "traefik"
    command:
      # Globals
      - "--log.level=DEBUG"
      - "--api=true"
      - "--global.sendAnonymousUsage=false"
      # Docker
      - "--providers.docker=true"
      - "--providers.docker.exposedbydefault=false"
      - "--providers.docker.endpoint=unix:///var/run/docker.sock"
      # Entrypoints
      - "--entrypoints.web.address=:80"
      - "--entrypoints.websecure.address=:443"
      # LetsEncrypt
      # - "--certificatesresolvers.mydnschallenge.acme.caServer=https://acme-staging-v02.api.letsencrypt.org/directory"
      - "--certificatesresolvers.mydnschallenge.acme.email=${CF_API_EMAIL}"
      - "--certificatesresolvers.mydnschallenge.acme.dnschallenge.provider=cloudflare"
      - "--certificatesresolvers.mydnschallenge.acme.storage=/etc/traefik/acme.json"
    ports:
      - "80:80"
      - "443:443"
    environment:
      - CF_API_EMAIL=${CF_API_EMAIL}
      - CF_API_KEY=${CF_API_KEY}
    volumes:
      - "/etc/traefik/acme.json:/etc/traefik/acme.json"
      - "/var/run/docker.sock:/var/run/docker.sock:ro"
    labels:
      # API
      - "traefik.enable=true"
      - "traefik.http.routers.traefik.rule=Host(`traefik.mydomain.fyi`)"
      - "traefik.http.services.traefik.loadbalancer.server.port=8080"
      - "traefik.http.services.traefik.loadbalancer.server.scheme=http"
      # Wildcard cert
      - "traefik.http.routers.traefik.tls.domains[0].main=mydomain.fyi"
      - "traefik.http.routers.traefik.tls.domains[0].sans=*.mydomain.fyi"
      - "traefik.http.routers.traefik.tls.certresolver=mydnschallenge"
      # Global http-->https
      - "traefik.http.routers.http-catchall.rule=hostregexp(`{host:[a-z-.]+}`)"
      - "traefik.http.routers.http-catchall.entrypoints=web"
      - "traefik.http.routers.http-catchall.middlewares=redirect-to-https"
      - "traefik.http.middlewares.redirect-to-https.redirectscheme.scheme=https"
  whoami:
    image: "containous/whoami"
    container_name: "whoami"
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.whoami.rule=Host(`whoami.mydomain.fyi`)"
      - "traefik.http.routers.whoami.entrypoints=websecure"
      - "traefik.http.routers.whoami.tls.certresolver=mydnschallenge"
  ovpn:
    image: "kylemanna/openvpn"
    container_name: "ovpn"
    volumes:
      - "/opt/docker/ovpn:/etc/openvpn"
    cap_add:
      - NET_ADMIN
    labels:
      - "traefik.enable=true"
      - "traefik.tcp.routers.ovpn.rule=HostSNI(`*`)"
      - "traefik.tcp.routers.ovpn.entrypoints=websecure"
      - "traefik.tcp.routers.ovpn.tls=false"
      - "traefik.tcp.routers.ovpn.service=ovpn"
      - "traefik.tcp.services.ovpn.loadbalancer.server.port=1194"

NB: OpenVPN needs to be run in TCP as opposed to UDP. See docs for details.

The below snippet assumes running on CoreOS

# Set up the storage volume and fqdn
VPN_HOST="vpn.mydomain.fyi"
OVPN_DATA="/opt/docker/ovpn"

# Create folder structure (CoreOS will keep /opt)
sudo mkdir -p $OVPN_DATA
sudo chown -R core:core /opt/docker

# Initialise the container and specify TCP on the SSL port
docker run -v $OVPN_DATA:/etc/openvpn --rm kylemanna/openvpn ovpn_genconfig -u tcp://$VPN_HOST:443

# Initialise the PKI
docker run -v $OVPN_DATA:/etc/openvpn --rm -it kylemanna/openvpn ovpn_initpki

Now can generate client certs and connect

# Generate a client certificate without a passphrase
CLIENTNAME=darthveitcher
docker run -v $OVPN_DATA:/etc/openvpn --log-driver=none --rm -it kylemanna/openvpn easyrsa build-client-full $CLIENTNAME nopass

# Retrieve the client configuration with embedded certificates
docker run -v $OVPN_DATA:/etc/openvpn --log-driver=none --rm kylemanna/openvpn ovpn_getclient $CLIENTNAME > $CLIENTNAME.ovpn