[v2.0-alpha7] docker swarm provider - "port is missing"

Traefik Traefik v2 (latest)
1

I am struggling with getting docker provider simple HTTP app working.

Traefik container log show "error" with message "port is missing".

Bellow are my configs:

Traefik compose file:

version: "3.7"

services:
  traefik:
    image: traefik:v2.0
    ports:
      - "80:80"
      - "8080:8080"
      - "443:443"
    networks:
      - web
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - /opt/traefik/traefik.yaml:/etc/traefik/traefik.yaml
      - /opt/traefik/acme.json:/opt/traefik/acme.json

networks:
  web:
    external: true

traefik.yaml:

global:
  sendAnonymousUsage: false
log:
  level: "DEBUG"
providers:
  docker:
    swarmMode: true
    watch: true
    exposedByDefault: false

api:
  dashboard: true

entryPoints:
  web:
    address: ":80"
  web-secure:
    address: ":443"

acme:
  email: "xxx@yyy.zz"
  storage: /opt/traefik/acme.json
  onHostRule: true
  httpChallenge:
    entryPoint: web

app compose file:

version: "3.7"
services:
  app_staging:
    image: 192.168.64.148:5000/appimg:latest
    environment:
      - ASPNETCORE_ENVIRONMENT=Staging
      - CONFIG_FILE=/run/secrets/staging.config
    networks:
      - web
    secrets:
      - staging.config
    deploy:
      labels:
        - "traefik.enable=true"
        - "traefik.port=80"
        - "traefik.http.routers.app_test.rule=Host(`test.app.com`)"
        - "traefik.docker.network=web"
      update_config:
        order: start-first

secrets:
  staging.config:
    file: ./staging.config

networks:
  web:
    external: true
    name: web
2

Hello,

It's a v1 label, for the v2 you have to use:

"traefik.http.services.service0.loadbalancer.server.port=80"
3

Oh I see, gonna try that. But is that a required label? Didn't notice any such in the v2 docs about Docker provier.

4

It's not required, it's depend how your image is define: if your image define a port Traefik will use that port.

5

And how would such a port definition need to be done? I was trying to set ports for the service docker compose, but that didn't work either.

Edit:

I tried:

 ports:
  - 80

That didnt work

And:

expose:
 - 80

Which doesn't work for docker, as its deprecated option -

expose: Exposing ports is unnecessary - services on the same network can access each other's containers on any port.

Edit 2:

I also tried adding EXPOSE 80 to dockerfile, but that didn't help either.

6

traefik.http.services.[whatever].loadbalancer.server.port=80

Kind of annoying that the shortcuts we used to have no longer exist and we have to name everything. In addition I think these names have to be unique across the swarm

7

Yes, learned hard way. If not unique, it starts mixing the services when routing requests.

8

Seems V2 is quite flakey out the gate, hopefully things drastically change before it gets GA