Traefik 404 errors solution.

_problem.md

I configured Traefik via /etc/traefik/traefik.toml in docker-compose.yml, but all routes were giving me 404 Not Found results. The routing did not even work, nothing was forwarded to the right service.

The culprit turned out to be that providers need to be configured.

docker-compose.yml

services:
  traefik:
    image: "traefik:v3.2"
    container_name: "traefik"
    command:
      - "--configFile=/etc/traefik/traefik.toml"
    ports:
      - "80:80"
      - "8080:8080"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock:ro"
      - "./traefik.toml:/etc/traefik/traefik.toml"

error_example.txt

curl -i 'http://localhost:80/foo'

HTTP/1.1 404 Not Found
Content-Type: text/plain; charset=utf-8
X-Content-Type-Options: nosniff
Date: Fri, 27 Dec 2024 18:38:51 GMT
Content-Length: 19

404 page not found

solution.toml

[providers]
  [providers.file]
    filename = "/etc/traefik/traefik.toml"

traefik.toml

[log]
  level = "DEBUG"

[accessLog]

[api]
  insecure = true
  dashboard = true

[entryPoints]
  [entryPoints.web]
    address = ":80"

[http]
  [http.routers]
    [http.routers.todo]
      rule = "PathPrefix(`/`)"
      service = "todo"
      entryPoints = ["web"]

    [http.services.todo.loadBalancer]
      [[http.services.todo.loadBalancer.servers]]
        url = "http://host.docker.internal:4000"

[providers] # 404 not found - solution
  [providers.file]
    filename = "/etc/traefik/traefik.toml"