不要在 traefik 规则中规范化 docker 容器名称

Question

I want to use Traefik v2.5 as a local reverse proxy to access all docker containers of my local daemon using a domain of pattern http://container_name.localhost in my browser.

This is my docker-compose.yml file:

version: "3.7"
services:
  traefik:
    image: traefik:v2.5
    restart: always
    network_mode: "host"
    ports:
      - "80:80"
      - "443:443"
      - "8080:8080"
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    command:
      - "--api.insecure=true"
      - "--providers.docker=true"
      - "--providers.docker.exposedbydefault=true"
      - "--providers.docker.defaultrule=Host(`{{ .Name }}.localhost `)"
      - "--entrypoints.web.address=:80"

Then I started the container and a simple web server to see if it worked:

docker-compose up -d
docker run -d --name my_nginx nginx

Then, I was able to access the web server at http://my-nginx.docker.localhost/ . However, the name of the docker container uses underscores and not hyphens. This makes it very confusing if you just want to access one of your containers in the browser. Therefore, I want to access the container using http://my_nginx.localhost/ . Is there a way to disable the normalization of the traefik rule?

I am aware that one normally uses hyphens in URLs, but docker just wants to have it's underscores, and this is just my local dev environment. I also do not want to add a traefik label manually, eg

traefik.http.routers.my_nginx.rule==Host(`my_nginx.localhost`)

whenever I start a simple dev container.

Answer 1

I just checked the docs , and it's written that you have sprig functions available in the go template snippets.

Therefore, you can leverage go template + sprigs string functions to replace the hyphen with underscores.

Host(`{{ .Name | replace "-" "_" }}.localhost `)