PathPrefix won't work

Traefik Traefik v3 (latest)
1

Hi there!
I'm discovering Traefik through docker and I have an issue I can't resolve.
Sorry if I'm making a double!

I have a docker-compose.yml for traefik and another one for a server with php-mysql-phpmyadmin.
Everything works fine but I can't reach phpmyadmin's main page.
I'm trying everything on a sub-domain that will be called... 'sub.domain.com'!
I'm trying to reach phpmyadmin through 'sub.domain.com/phpmyadmin.
Here is my yml for php-mysql-phpmyadmin:

services:
  mysql:
    image: mysql:latest
    environment:
      MYSQL_ROOT_PASSWORD: secret
      MYSQL_DATABASE: mydatabase
      MYSQL_USER: myuser
      MYSQL_PASSWORD: mypassword
    volumes:
      - mysql_data:/var/lib/mysql
    networks:
      - web_test
  phpmyadmin:
    image: phpmyadmin/phpmyadmin:latest
    links:
      - mysql
    ports:
      - 8081:80
    environment:
      PMA_HOST: mysql
      MYSQL_USERNAME: root
      MYSQL_ROOT_PASSWORD: secret
    networks:
      - web_test
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.phpmyadmin.rule=(Host(`sub.domain.com`) && PathPrefix(`/phpmyadmin`))"
  php:
    build:
      context: .
      dockerfile: Dockerfile
    volumes:
      - ./src:/var/www/html
    ports:
      - 8085:80
    depends_on:
      - mysql
    networks:
      - web_test
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.php.rule=(Host(`sub.domain.com`))"

volumes:
  mysql_data:

networks:
  web_test:
    external: true

and here my docker-compose for traefik:

networks:
  web_test:
    external: true

services:
  traefik:
    image: "traefik:latest"
    container_name: "traefik"
    command:
      - "--api.insecure=true"
      - "--providers.docker=true"
      - "--providers.docker.exposedbydefault=false"
      - "--entryPoints.web.address=:8082"
    ports:
      - "8082:80"
      - "8086:8080"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock:ro"
    networks:
      - web_test

When I try https://sub.domain.com, I reach my index.php
but https://sub.domain.com/phpmyadmin gives me a 404 error (not found)

I think I forgot something but I don't find what! If someone can help...
Thank you very much and sorry for my bad english...

2

Why do you think it should work?

Doc states

All of the following examples will bring you phpMyAdmin on http://localhost:8080

so the app expects to be root (/).

If you access the service with unknown path /phpmyadmin (which will be forwarded to the service), it will return 404. It’s that simple.

Best practice is to use sub-domains for services instead, check simple Traefik example.

3

Thank you very much!
Using sub2.domain.com (root) works very well!