Fix traefik: Gateway timeout

dns/docker-compose.yml

@@ -3,6 +3,7 @@ version: '2'
 services:
   pihole:
     container_name: pihole
+    hostname: pihole
     image: pihole/pihole
     volumes:
       - pihole_dnsmasq:/etc/dnsmasq.d
@@ -16,7 +17,6 @@ services:
     ports:
      - "53:53/tcp"
      - "53:53/udp"
-     - 8420:80
     cap_add:
       - NET_ADMIN
     networks:
@@ -28,6 +28,7 @@ services:
       - traefik.http.routers.pihole.entrypoints=web
       - traefik.http.routers.pihole.rule=Host(`pihole.franz.local`)
       - traefik.http.services.pihole.loadbalancer.server.port=80
+      - traefik.docker.network=traefik-net
 
   unbound:
     container_name: unbound