Traefik@docker service server error

Traefik Traefik v2
1

When I navigate to Traefik dashboard and click on services, I can see Traefik service there. When I click on it, the server has an error exclamation mark next to it.

image
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Interestingly, Traefik dashboard works even if server is not in successful state. If I navigate to /api/http/services/traefik@docker, I don't see any error message there:

{
  "loadBalancer":{
    "servers":[
      {
        "url":"https://10.0.7.234:8080"
      }
    ],
    "passHostHeader":true
  },
  "status":"enabled",
  "name":"traefik@docker",
  "provider":"docker",
  "type":"loadbalancer"
}

Here is my configuration:

docker-compose-traefik.yml

version: "3.7"

services:
  traefik:
    image: "traefik:v2.0"
    networks:
      - traefik-net
    ports:
      - "9000:9000"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock:ro"
      - "./config/:/etc/traefik/"
      - "./cert/:/cert/"
    deploy:
      replicas: 1
      labels:
        # enable Traefik for this service
        - "traefik.enable=true"
        - "traefik.docker.network=traefik-net"
        
        # dashboard
        - "traefik.http.routers.traefik.rule=Host(`example.com`)"
        - "traefik.http.routers.traefik.entrypoints=traefik"
        - "traefik.http.routers.traefik.tls=true"
        - "traefik.http.routers.traefik.service=api@internal"

        # service
        - "traefik.http.services.traefik.loadbalancer.server.port=8080"
        - "traefik.http.services.traefik.loadbalancer.server.scheme=https"

networks:
  traefik-net:
    external: true
    name: traefik-net

config/traefik.yml

log:
  level: DEBUG

api:
  dashboard: true
  insecure: false

serversTransport:
  insecureSkipVerify: true

providers:
  file:
    directory: "/etc/traefik"
    watch: true
  docker:
    swarmMode: true
    exposedByDefault: false

entrypoints:
  traefik:
    address: ":9000"

config/dynamic_conf.yml

tls:
  stores:
    default:
      defaultCertificate:
        certFile: /cert/example.com.crt
        keyFile: /cert/example.com.key
  certificates:
    - certFile: /cert/example.com.crt
      keyFile: /cert/example.com.key
      stores:
        - default

I can see in the logs that server is not created for Traefik. For other services I can see the following debug output (ex. Creating server 0 https://10.0.7.237:443). Can this be a reason for exclamation mark? If not, how can I check what is wrong with the server? Why is server not being created?

2

Maybe related: Failing health check not taking service offline

3

There's also a ticket regarding that by me, which was closed as "solved", but isn't (at least for me):

4

Now it is reopened. I suggest that you post a minimal working example there so they can reproduce the issue.