Traefik + Docker Compose

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Traefik + Docker Compose

Setting up Traefik Proxy with Docker Compose

Faiz A. Farooqui's photo
Faiz A. Farooqui
ยทNov 18, 2022ยท

3 min read

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Table of contents

  • Introduction
  • Docker Compose
  • Details (of the content mentioned in Docker Compose file)
  • Screenshots
  • Summary
  • About Me ๐Ÿ‘จโ€๐Ÿ’ป

Introduction

In this post, I'll show you how to install Traefik Proxy โ€” the cloud native application proxy in our Docker Compose file and utilize it in our architecture with a sample service container.

Traefik Proxy was discussed in my previous post โ€” How much do you know "Traefik" proxy?

As a baseline, I'm assuming you're familiar with Docker and Docker Compose files.

Let's get started โ€”

Docker Compose

  • Add the following content to your docker-compose.yml file
version: '3.6'

services:
  traefik:
    image: "traefik:v2.9"
    container_name: "traefik"
    command:
      - "--api.insecure=true"
      - "--providers.docker=true"
      - "--providers.docker.exposedbydefault=false"
      - "--log.level=debug"
      - "--entrypoints.web.address=:1337"
    ports:
      - "1337:1337"
      - "9090:8080"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock:ro"

  whoami:
    image: "traefik/whoami"
    container_name: "iamfoo"
    command: "--port 80 --name iamfoo"
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.whoami.entrypoints=web"
      - "traefik.http.routers.whoami.rule=(Host(`localhost`) && PathPrefix(`/whoami`))"

Details (of the content mentioned in Docker Compose file)

  • Replace localhost with your own domain or sub-domain in service container whoami
  • Run docker-compose.yml file by using the command docker-compose up -d
  • Your server should be up and running. Visiting http://localhost:1337/whoami, will show you all request headers
  • I'm using Traefik's whoami service as an example, it is a tiny Go server that prints os information and HTTP request to output
command:
  - "--entrypoints.web.address=:1337"

ports:
  - "1337:1337"
  • The above mini snapshot shows how we define entry point in Traefik
  • This allows us to "open and accept" HTTP traffic
command:
  - "--api.insecure=true"

ports:
  - "9090:8080"
  • The above mini snapshot shows how we configure & expose Traefik's API and Dashboard.
  • By default, Traefik will listen on port 8080 for API requests
  • This is a fully optional step; we may disable the Dashboard and secure APIs if you do not want to.
command:
  - "--log.level=debug"
  • To enable and customise the log and it's level, we can use the command as mentioned above
  • Accepted values, in order of severity - DEBUG, INFO, WARN, ERROR, FATAL & PANIC
traefik:
  command:
    "--providers.docker=true"
    "--providers.docker.exposedbydefault=false"
  volumes:
    - "/var/run/docker.sock:/var/run/docker.sock:ro"

whoami:
  ...
  labels:
    - "traefik.enable=true"
    - "traefik.http.routers.whoami.entrypoints=web"
    - "traefik.http.routers.whoami.rule=(Host(`localhost`) && PathPrefix(`/whoami`))"
  • To enable docker as a providers for Traefik configuration, we set the value as true against providers.docker
  • If we want to enable all the service containers within the docker-compose file, we can set the value as true against providers.docker.exposedbydefault
  • But, I'd recommend to not expose all service containers unless really needed
  • If choose to not explicitly expose all your service containers, then you'd need to enable each container service by setting traefik.enable as true
  • To allow request only from your predefined entry point, we set traefik.http.routes.whoami.entrypoint with the name value we defined in our traefik service - in our case, it is web

Screenshots

Traefik Dashboard

Screenshot 2022-11-18 at 1.32.37 PM.png

Traefik Dashboard's Routers List

Screenshot 2022-11-18 at 1.32.45 PM.png

Whoami Service Container

Screenshot 2022-11-18 at 1.33.04 PM.png

Summary

After reading this article, you will have a fundamental grasp on how to setup Traefik Proxy in your Docker Compose with a service.

And I strongly advise everyone to have the "traefik/whoami" service container ready for debugging request headers if something goes wrong.


About Me ๐Ÿ‘จโ€๐Ÿ’ป

I'm Faiz A. Farooqui. Software Engineer from Bengaluru, India. Find out more about me @ faizahmed.in

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