Traefik.docker.network = doesnt work. It's always random

Traefik Traefik v2
,
1

Hello guys.
I upgraded my docker-compose.yml. But now I have a problem.
Since 3 months, I'm trying to figuring out why it's working 50% of the time. Each time I restart my docker-compose.yml, it can work, or it can't work.
I think I found it. the network is randomly chosen. I saw it with Authentik.
I tried to replicate the problem and here is the problem:

If I have multiple networks.

networks:
    socket_proxy: # /var/run/docker.sock
        ipam:
            config:
                - subnet: "192.168.50.0/24"
    backend:
        ipam:
            config:
                - subnet: "192.168.60.0/24"
    dmz: # proxy between backend / frontend
        ipam:
            config:
                - subnet: "192.168.70.0/24"
    frontend:
        ipam:
            config:
                - subnet: "192.168.80.0/24"

And I use traefik with a service, like nginx:

services:
    traefik:
        networks:
            - socket_proxy
            - frontend

    nginx:
        ...
        networks:
            - frontend
            - dmz
        labels:
            - "traefik.enable=true"
            - "traefik.docker.network=frontend"
            ## HTTPS Routers
            - "traefik.http.routers.nginx-secure-rtr.entrypoints=websecure"
            - "traefik.http.routers.nginx-secure-rtr.rule=Host(`nginx.mydomain.com`)"
            - "traefik.http.routers.nginx-secure-rtr.tls=true"
            ## HTTPS Services
            - "traefik.http.routers.nginx-secure-rtr.service=nginx-svc"
            - "traefik.http.services.nginx-svc.loadbalancer.server.port=80"
            ## MIDDLEWARES
      #      - "traefik.http.routers.nginx-secure-rtr.middlewares=chain-multi-auth@file"
            - "traefik.http.routers.nginx-secure-rtr.middlewares=chain-authentik@file"

Traefik gonna take randomly "dmz" or "frontend" as network.
Even when "traefik.docker.network=frontend" is there.

  • 192.168.70.X ==> bad
  • 192.168.80.X ==> good

What can it be? Is it in the static file?
Thank for your help.

2

Bad gateway usually happens when Traefik and target service are not connected to the same or multiple Docker networks.

It’s probably about:

 - "traefik.docker.network=frontend"

You can try one of those:

  • adapt it to the real Docker network name (which gets a prefix by compose, use docker networks ls to check
  • probably better to add name: frontend to the compose network definition (to keep the name fixed)
3

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