Docker-compose having problems with labels

Question

I'm trying to setup Traefik reverse proxy using example shown in their docs. When I try to bring up 'whoami' service I get following error:

Creating test_whoami_1 ... 

ERROR: for test_whoami_1  dictionary update sequence element #0 has length 22; 2 is required

ERROR: for whoami  dictionary update sequence element #0 has length 22; 2 is required
Traceback (most recent call last):
  File "bin/docker-compose", line 6, in <module>
  File "compose/cli/main.py", line 68, in main
  File "compose/cli/main.py", line 121, in perform_command
  File "compose/cli/main.py", line 952, in up
  File "compose/project.py", line 455, in up
  File "compose/parallel.py", line 70, in parallel_execute
ValueError: dictionary update sequence element #0 has length 22; 2 is required
Failed to execute script docker-compose

Example docker-compose.yml can be found in Traefik docs: test/docker-compose.yml

version: '3.3'

services:
  whoami:
    image: emilevauge/whoami
    networks:
      - web
    labels:
      - "traefik.backend=whoami"
      - "traefik.frontend.rule=Host:whoami.docker.localhost"

networks:
  web:
    external:
      name: traefik_webgateway

traefik/docker-compose.yml

version: '3.3'

services:
  proxy:
    image: traefik:1.4.1
    restart: always
    ports:
      - 80:80
      - 8080:8080
    command: --web --docker --docker.domain=docker.localhost --logLevel=DEBUG
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
      - "./traefik.toml:/traefik.toml"
    container_name: traefik

networks:
  webgateway:
    driver: bridge

Using following docker and docker-compose versions:

Docker version 17.09.0-ce, build afdb6d4
docker-compose version 1.17.0, build ac53b73

Answer 1

Solution: downgrade to docker-compose v1.16.1.

Answer 2

Docker compose labels is included in version v3.3 and you're running version 1.17.0

Please see the doc for more info.