Application URL write behind Traefik as Reverse Proxy possible?

Traefik Traefik v2
,
1

Hi everybody,

I'm trying to setup Traefik 2.2.0 as Reverse Proxy for some containers. In detail, I'm running two web applications that I want to expose via dedicated directories /app1 and /app2.

I figured out how to set-up a middleware to strip /app2 from the URL before passing the request to the application. Otherwise the request results in a 404 error as GET / is replaced by GET /app2/.

Anyhow, the application has links on the landing page (e.g. /pageA, /pageB,...). Clicking on one of the links of course results in a 404 error as the URLs are not rewritten.

My question now is - how can I implement this URL rewriting?

Any hints or tips are welcome - I'm quite new to Traefik and reverse proxies in general. :slight_smile:

What I tried
I tried to assign redirectregex and replacepathregex middlewares to the application - with or without the stripprefix middleware:

    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.radio.rule=Host(`192.168.0.246`) && PathPrefix(`/app2`)"
      - "traefik.http.routers.radio.entrypoints=web"
      - "traefik.http.middlewares.radio_strip_prefix.stripprefix.prefixes=/app2"
      - "traefik.http.middlewares.test-replacepathregex.replacepathregex.regex=^/app2/(.*)"
      - "traefik.http.middlewares.test-replacepathregex.replacepathregex.replacement=/$$1"
      - "traefik.http.routers.radio.middlewares=radio_strip_prefix@docker,test-replacepathregex@docker"
      #- "traefik.http.routers.radio.middlewares=test-replacepathregex@docker"

    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.radio.rule=Host(`192.168.0.246`) && PathPrefix(`/app2`)"
      - "traefik.http.routers.radio.entrypoints=web"
      - "traefik.http.middlewares.radio_strip_prefix.stripprefix.prefixes=/app2"
      - "traefik.http.routers.radio.middlewares=radio_strip_prefix@docker,test-redirectregex@docker"
      - "traefik.http.routers.radio.middlewares=test-redirectregex@docker,replacepathregex@docker"
      #- "traefik.http.routers.radio.middlewares=test-redirectregex@docker"

None of them were working as expected.

Environment

  • Traefik 2.2.0 Docker Container
  • Docker CE 19.03 (armhf)
  • two Docker web applications

Dockerfile

version: "3.7"

services:
  traefik:
    image: traefik:2.2
    container_name: traefik
    command:
      - "--api.insecure=true"
      - "--providers.docker"
      - "--providers.docker.exposedbydefault=false"
      - "--entrypoints.web.address=:80"
    ports:
      - "80:80"
      - "8080:8080"
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
  whoami:
    image: containous/whoami
    container_name: whoami
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.whoami.rule=Host(`<ip-address>`) && PathPrefix(`/app1`)"
      - "traefik.http.routers.whoami.entrypoints=web"
  radio:
    image: stdevel/radio_api
    container_name: radio_dev
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.radio.rule=Host(`<ip-address>`) && PathPrefix(`/app2`)"
      - "traefik.http.routers.radio.entrypoints=web"
      - "traefik.http.middlewares.radio_strip_prefix.stripprefix.prefixes=/app2"
      ##- "traefik.http.routers.radio.middlewares=radio_strip_prefix@docker"
      #- "traefik.http.routers.radio.middlewares=radio_strip_prefix@docker,test-redirectregex@docker"
      #- "traefik.http.routers.radio.middlewares=test-redirectregex@docker"
      - "traefik.http.middlewares.test-replacepathregex.replacepathregex.regex=^/app2/(.*)"
      - "traefik.http.middlewares.test-replacepathregex.replacepathregex.replacement=/$$1"
      - "traefik.http.routers.radio.middlewares=radio_strip_prefix@docker,test-replacepathregex@docker"
1 Like
2

Hello

I am trying to do the same thing as you.

From what I have seen so far there is no way to do it only using Traefik.

Though some applications can be configured to run behind a reverse proxy using an url prefix, like discussed about Grafana for example : Why doesn't traefik readd PathPrefix prefixes to backend responses?

1 Like
4

Hey evdel,
that's interesting - thanks for sharing!

Best wishes,
Christian.

5

You're welcome. Finally I ended up creating one sub-domain for the other app I wanted to expose.

I think it is the simplest solution. Why not having something like app1.domain.com and app2.domain.com for example ?

Cheers

6

Hello, Have you solved the problem with /paths? I am struggling with it as well. I want to have Hashicorp Nomad UI at https://mydomain.com/nomad, no successes so far.