Docker Watchtower gives me an error: port is missing" providerName=docker

Question

today at 15:09  time="2021-01-15T14:09:47Z" level=error msg="service \"watchtower-source\" error: port is missing" providerName=docker container=watchtower-source-338c650e497d25342cd554c2dcddda597a8ae1f6f1af9d38ddffa4768d51c512

... but there isn't a port to expose what am I missing? any pointers?

My docker-compose.yml config for watchtower

  watchtower:
    image: v2tec/watchtower:latest
    container_name: watchtower
    restart: on-failure
    volumes:
     - /var/run/docker.sock:/var/run/docker.sock
    command: --interval 120
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.watchtower.tls=true"

Answer 1

That looks related to Traefik, not wotchtower.

For instance, you see the same error in traefik/traefik issue 5418:

When you enable the "file provider", it means you are enabling the dynamic configuration to be retrieved from a file, while traefik.yml is the file containing the static configuration.
Reference: https://docs.traefik.io/v2.0/getting-started/configuration-overview/#the-static-configuration.

Similar to traefik/traefik issue 5732

Just needed to add this line to service:

- traefik.http.services.whoami5.loadbalancer.server.port=80

Try to define routers and services in the file specified by providers.file.filename a