Help with WebSockets + Traefik + Docker

Traefik Traefik v1
,
1

Hello,

I have a nodejs websockets service. To scale it up and down we are going to use docker containers. But websockets require sticky session and I couldn't get it working with traefik. (It works well with haproxy but it's not really good for us).

Here's my docker-compose.yaml, thanks in advance.

version: '3'

services:
  traefik:
    image: traefik:latest
    command: --web --docker --docker.domain=app.test --logLevel=DEBUG
    ports:
      - 80:80
      - 8080:8080
    networks:
      - mystack_default
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    labels:
      - "traefik.port=8080"
    restart: always
    deploy:
      placement:
        constraints:
            - node.role == manager
  socket:
    ports:
        - 9800:3000
    image: 'umityayla/socket:latest'
    deploy:
        labels:
            - "traefik.port=3000"
            - "traefik.backend=socket"
            - "traefik.backend.loadbalancer.stickiness=true"
            - "traefik.backend.loadbalancer.sticky=true"

networks:
  mystack_default:
    driver: overlay
2

Hello @umityayla,

at first: you're mixing things up here. You're pulling traefik:latest, which results in you pulling the v1 (therefore, friends to let friends use :latest ;-)).

The labels you're setting are to be used with the v1.7 tough. Can you therefore please pull traefik:1.7.12 and try again? :slight_smile:

3

unfortunately, still the same.. :confused: and traefik dashboard shows my other containers too, is this normal?

4

Yeah. exposeByDefault is set to true by default. Therefore its totaly fine to see the other containers. What is the error you're facing?

version: '3'

services:
  traefik:
    image: traefik:v1.7.12
    command: --api --docker --docker.domain=app.test --docker.exposedbydefault=false --logLevel=DEBUG
    ports:
      - 80:80
      - 8080:8080
    networks:
      - mystack_default
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    labels:
      - "traefik.enabale=true"
      - "traefik.port=8080"
    restart: always
    deploy:
      placement:
        constraints:
            - node.role == manager
  socket:
    ports:
        - 9800:3000
    image: 'umityayla/socket:latest'
    deploy:
        labels:
            - "traefik.enabale=true"
            - "traefik.port=3000"
            - "traefik.backend.loadbalancer.stickiness=true"

networks:
  mystack_default:
    driver: overlay
5

i don't see any errors but, when i use the configuration file you sent; only traefik container is visible in the traefik dashboard.

6

That is because I've set --docker.exposedbydefault=false in the command for the traefik container.

So when you dont see any errors - what issue are you having exactly?

7

firstly shouldn't socket service's containers visible in the dashboard?
also sticky connection isn't hapenning. I'm having issues connecting.

8

If I trust the tags you have put in the topic, you're using swarm.

Then you need to:

  • activate the swarm mode
  • put labels inside the deploy section
version: '3'

services:
  traefik:
    image: traefik:v1.7.12
    command:
      - "--api"
      - "--docker"
      - "--docker.domain=app.test"
      - "--docker.swarmMode=true"
      - "--docker.watch=true"
      - "--docker.exposedbydefault=false"
      - "--logLevel=DEBUG"
    ports:
      - 80:80
      - 8080:8080
    networks:
      - mystack_default
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    restart: always
    deploy:
      labels:
        - "traefik.enabale=true"
        - "traefik.port=8080"
      placement:
        constraints:
            - node.role == manager
  socket:
    ports:
      - 9800:3000
    image: 'umityayla/socket:latest'
    deploy:
      labels:
        - "traefik.enable=true"
        - "traefik.port=3000"
        - "traefik.backend.loadbalancer.stickiness=true"

networks:
  mystack_default:
    driver: overlay
9

unfortunately, this didn't solve either. but thanks for your help, I guess I'm going to create containers manually and assign ports to them incremental ports (3000,3001,3002) then route them from another haproxy server. thanks again.

10

I still dont understand the final issue. Did you bound your service (container) to an another entrypoint? Otherwise traefik doesnt know that your service / container needs get websocket traffic proxied to.

traefik.frontend.entryPoints=http,ep-ws
12

I noticed that you have - "traefik.enabale=true"

im guessing there is a typo in enable.