Minimal example for traefik with dashboard and basic auth

lonix · May 30, 2023, 8:31am

I'm trying to implement traefik with basic auth to protect the dashboard. I wrote a minimal example, but it doesn't work.

I generated the password like this:

$ htpasswd -nb admin password
admin:$apr1$vO3/IDvg$JrbhU9NSQub83/mQu9/fP1

docker-compose.yml

services:
  traefik:
    image: traefik:v2.10.1
    restart: unless-stopped
    ports:
      - 80:80
      - 8080:8080
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - ./traefik.yml:/etc/traefik/traefik.yml:ro
      - ./traefik_dynamic.yml:/etc/traefik/traefik_dynamic.yml:ro

traefik.yml

providers:
  docker:
    exposedByDefault: false
    network: web
    watch: true
  file:
    filename: /etc/traefik/traefik_dynamic.yml
    watch: true

entryPoints:
  web:
    address: ":80"

api:
  dashboard: true
  insecure: true

traefik_dynamic.yml

http:
  middlewares:
    dashboard-auth:
      basicAuth:
        users:
          - "admin:$apr1$vO3/IDvg$JrbhU9NSQub83/mQu9/fP1"
  routers:
    api:
      rule: "Host(`localhost`)"
      entrypoints: ["web"]
      middlewares: ["dashboard-auth"]
      service: "api@internal"

I can browse to http://myserver/dashboard/ which loads without errors.

But it does not ask for a username:password. How do I fix that?

bluepuma77 · May 30, 2023, 8:45am

Try disabling the insecure mode:

lonix · May 30, 2023, 9:04am

Thanks. I just tried that but then it doesn't load the dashboard at all.

I think that option is for loading the dashboard over http (rather than https) - and for the minimal example I posted above, it's using http.

bluepuma77 · May 30, 2023, 9:21am

Simple Traefik example with dashboard.

lonix · May 30, 2023, 11:03am

Thanks. I want to use the config file, not the docker-compose with labels.

That said, I took your example, removed all the https stuff, and ran it. I got the same result - it loads the dashboard without asking for the username:password.

Here's the compose file:

services:
  traefik:
    image: traefik:v2.10.1
    ports:
      - 80:80
      - 8080:8080
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
    command:
      - --api.dashboard=true
      - --api.insecure=true
      - --log.level=INFO
      - --providers.docker.exposedByDefault=false
      - --entrypoints.web.address=:80
    labels:
      - traefik.enable=true
      - traefik.http.routers.mydashboard.rule=Host(`localhost`)
      - traefik.http.routers.mydashboard.service=api@internal
      - traefik.http.routers.mydashboard.middlewares=myauth
      - traefik.http.middlewares.myauth.basicauth.users=test:$$apr1$$H6uskkkW$$IgXLP6ewTrSuBkTrqE8wj/

lonix · May 30, 2023, 11:04am

Can someone confirm whether the dashboard works without https and using the config file approach? (As I've shown in the minmal example above.)

bluepuma77 · May 30, 2023, 11:36am

This is a hack to quickly enable dashboard on port 8080, it will ignore middlewares, remove the line:

And the line was not in my config

lonix · May 30, 2023, 12:00pm

Hi again and thanks. No, like I wrote above, without that the dashboard won't even load. There's no https in my config above.

bluepuma77 · May 30, 2023, 4:58pm

Dashboard should be available at http://localhost/dashboard/.

lonix · May 31, 2023, 1:28am

Like I wrote above, it's not the case.

With that switch it loads without asking for username/password, without the switch it doesn't load.

ldez · May 31, 2023, 2:22am

the problem is easy to fix, you have to remove:

network: web because to don't have a web docker network
watch: true because this option is only for Swarm
insecure: true because you want to use the secured API.

docker-compose.yml

version: '3.9'

services:
  traefik:
    image: traefik:v2.10.1
    ports:
      - 80:80
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - ./traefik.yml:/etc/traefik/traefik.yml:ro
      - ./traefik_dynamic.yml:/etc/traefik/traefik_dynamic.yml:ro

traefik.yml

providers:
  docker:
    exposedByDefault: false
  file:
    filename: /etc/traefik/traefik_dynamic.yml
    watch: true

entryPoints:
  web:
    address: ":80"

api:
  dashboard: true

traefik_dynamic.yml

http:
  middlewares:
    dashboard-auth:
      basicAuth:
        users:
          - "admin:$apr1$vO3/IDvg$JrbhU9NSQub83/mQu9/fP1"
  routers:
    api:
      rule: "Host(`localhost`)"
      entrypoints:
       - web
      middlewares:
       - dashboard-auth
      service: api@internal

I run those exact files and everything run fine.

launch traefik

$ docker-compose up --remove-orphans
[+] Running 1/0
 ✔ Container simple-traefik-1  Created                                                                                                                     0.0s 
Attaching to simple-traefik-1
simple-traefik-1  | time="2023-05-31T02:16:50Z" level=info msg="Configuration loaded from file: /etc/traefik/traefik.yml"

Dashboard access

$ curl http://localhost/dashboard/                        
401 Unauthorized

$ curl -u "admin:password" http://localhost/dashboard/
<!DOCTYPE html><html><head><title>Traefik</title><meta charset=utf-8><meta name=description content="Traefik UI"><meta name=format-detection content="telephone=no"><meta name=msapplication-tap-highlight content=no><meta name=viewport co
ntent="user-scalable=no,initial-scale=1,maximum-scale=1,minimum-scale=1,width=device-width"><link rel=icon type=image/png href=statics/app-logo-128x128.png><link rel=icon type=image/png sizes=16x16 href=statics/icons/favicon-16x16.png><
link rel=icon type=image/png sizes=32x32 href=statics/icons/favicon-32x32.png><link rel=icon type=image/png sizes=96x96 href=statics/icons/favicon-96x96.png><link rel=icon type=image/ico href=statics/icons/favicon.ico><link rel=apple-to
uch-icon href=statics/icons/apple-icon-152x152.png><link rel=apple-touch-icon sizes=152x152 href=statics/icons/apple-icon-152x152.png><link rel=apple-touch-icon sizes=167x167 href=statics/icons/apple-icon-167x167.png><link rel=apple-tou
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ldez · May 31, 2023, 2:36am

The same thing but with only docker-compose (without the file provider)
I recommend this approach.

docker-compose.yml

version: '3.9'

services:
  traefik:
    image: traefik:v2.10.1
    ports:
      - 80:80
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
    command:
      - --api
      - --providers.docker.exposedbydefault=false
      - --entrypoints.web.address=:80
    labels:
      traefik.enable: 'true'

      # Dashboard
      traefik.http.routers.traefik.rule: Host(`localhost`)
      traefik.http.routers.traefik.entrypoints: web
      traefik.http.routers.traefik.service: api@internal
      traefik.http.routers.traefik.middlewares: dashboard-auth

      traefik.http.middlewares.dashboard-auth.basicauth.users: admin:$$apr1$$vO3/IDvg$$JrbhU9NSQub83/mQu9/fP1 # admin/password

Launch Traefik

$ docker-compose up --remove-orphans
[+] Running 1/0
 ✔ Container simple-traefik-1  Recreated                                                                                                                   0.0s 
Attaching to simple-traefik-1
simple-traefik-1  | time="2023-05-31T02:33:24Z" level=info msg="Configuration loaded from flags."

Dashboard access

$ curl http://localhost/dashboard/
401 Unauthorized

$ curl -u "admin:password"  http://localhost/dashboard/
<!DOCTYPE html><html><head><title>Traefik</title><meta charset=utf-8><meta name=description content="Traefik UI"><meta name=format-detection content="telephone=no"><meta name=msapplication-tap-highlight content=no><meta name=viewport content="user-scalable=no,initial-scale=1,maximum-scale=1,minimum-scale=1,width=device-width"><link rel=icon type=image/png href=statics/app-logo-128x128.png><link rel=icon type=image/png sizes=16x16 href=statics/icons/favicon-16x16.png><link rel=icon type=image/png sizes=32x32 href=statics/icons/favicon-32x32.png><link rel=icon type=image/png sizes=96x96 href=statics/icons/favicon-96x96.png><link rel=icon type=image/ico href=statics/icons/favicon.ico><link rel=apple-touch-icon href=statics/icons/apple-icon-152x152.png><link rel=apple-touch-icon sizes=152x152 href=statics/icons/apple-icon-152x152.png><link rel=apple-touch-icon sizes=167x167 href=statics/icons/apple-icon-167x167.png><link rel=apple-touch-icon sizes=180x180 href=statics/icons/apple-icon-180x180.png><link href=css/041f4ca8.f6e3d404.css rel=prefetch><link href=css/067758be.3de973dd.css rel=prefetch><link href=css/09354cb8.0e433876.css rel=prefetch><link href=css/09d4499a.34653c53.css rel=prefetch><link href=css/11f98cd8.02647ec3.css rel=prefetch><link href=css/29ab06d1.ec33fe24.css rel=prefetch><link href=css/2a73a9da.e66a33dc.css rel=prefetch><link href=css/3e3ce03c.9b22e80f.css rel=prefetch><link href=css/46fd955e.9b22e80f.css rel=prefetch><link href=css/491024e9.9b22e80f.css rel=prefetch><link href=css/52875482.9b22e80f.css rel=prefetch><link href=css/6d73c73c.9b22e80f.css rel=prefetch><link href=css/77d911b4.9b22e80f.css rel=prefetch><link href=css/797e4f23.9b22e80f.css rel=prefetch><link href=css/b34404c8.9b22e80f.css rel=prefetch><link href=css/e036c7dc.1666b9a0.css rel=prefetch><link href=js/041f4ca8.4f70d06d.js rel=prefetch><link href=js/067758be.c7890581.js rel=prefetch><link href=js/09354cb8.2e39e534.js rel=prefetch><link href=js/09d4499a.d0d6efba.js rel=prefetch><link href=js/11f98cd8.e511840d.js rel=prefetch><link href=js/29ab06d1.8f1fa71a.js rel=prefetch><link href=js/2a73a9da.b2faf5c2.js rel=prefetch><link href=js/2d21e8fd.c00ac0e6.js rel=prefetch><link href=js/3e3ce03c.293f4729.js rel=prefetch><link href=js/46fd955e.343a8488.js rel=prefetch><link href=js/491024e9.5ba4955c.js rel=prefetch><link href=js/52875482.65e645a6.js rel=prefetch><link href=js/6d73c73c.d8a27bbb.js rel=prefetch><link href=js/77d911b4.8d5002b7.js rel=prefetch><link href=js/797e4f23.771f63ae.js rel=prefetch><link href=js/b34404c8.7a4b9be8.js rel=prefetch><link href=js/e036c7dc.5d7ae0bf.js rel=prefetch><link href=css/app.3d2d5994.css rel=preload as=style><link href=js/app.0981e94c.js rel=preload as=script><link href=js/runtime.3de71a2a.js rel=preload as=script><link href=js/vendor.f60bcb86.js rel=preload as=script><link href=css/app.3d2d5994.css rel=stylesheet></head><body><div id=q-app></div><script type=text/javascript src=js/app.0981e94c.js></script><script type=text/javascript src=js/runtime.3de71a2a.js></script><script type=text/javascript src=js/vendor.f60bcb86.js></script></body></html>%

lonix · May 31, 2023, 2:42am

Thanks Idez! Unfortunately that is not working as expected.

curl http://localhost/dashboard/

Gives me 401

curl -u "admin:password" http://localhost/dashboard/

Gives me 401

If I add 8080:8080 to compose file, then:
curl -u "admin:password" http://localhost/dashboard/

It works! ...but only from inside that server
It doesn't work when I access it remotely: http://myserver:8080/dashboard/

Maybe I'm not understanding something important? Can I access the dashboard remotely, without https, and still have basic auth?

ldez · May 31, 2023, 2:45am

basic auth is not related to TLS (HTTPS).

If you are using my files, the port 8080 cannot work, it's impossible:

because port 8080 is not exposed
because http://localhost means port 80

If you want to access remotely you have to use a real domain and change the router rule: Host(`example.com`)

lonix · May 31, 2023, 2:50am

Ok I will connect it to a domain and report my findings. Thanks for your advice!

BTW I was accessing it as http://xxx.xxx.xxx.xxx:8080/dashboard/

ldez · May 31, 2023, 2:53am

I think you don't provide all the information.

If you are using my files (I recommend just copy-paste my files) the port 8080 is not exposed so you cannot access it through port 8080.
But maybe to have something not related to Traefik that redirects port 8080 on port 80.

Or you are not using my files and you still have api.insecure: true and port 8080:8080.

Your context is not clear.

lonix · May 31, 2023, 4:18am

Hi, I am busy setting up new domain as you suggested... I am sure you are right that is the issue.

But in the meantime, to answer your above comment:

I actually I did use your code exactly... copy-paste. And:

on server itself, curl http://localhost/dashboard/ gives 401 same as you
on server itself, curl -u "admin:password" http://localhost/dashboard/ gives 200/OK and dashboard same as you
BUT, on my computer, when I access remote server, curl -u "admin:password" http://xxx.xxx.xxx.xxx/dashboard/ it gives 404 (however when I add 8080, it loads but without username/password challenge)

So when I follow instructions exactly, it works inside server, but not when accessed from outside world.

No worries though - I will setup a domain and try again...

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Minimal example for traefik with dashboard and basic auth

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