Get Started with Traefik 2 Using Docker Compose

I am using Traefik as a reverse proxy to publish and secure services that are running in a Docker container. This blog post will describe how to get started with Traefik 2 using docker-compose on a single host.

Since I am using many Traefik instances on different hosts, I’ve created a repository called traefik-dockerized to make the deployment easier.

First, clone the repository.

$ git clone https://github.com/cedrichopf/traefik-dockerized.git Cloning into 'traefik-dockerized'... 
$ cd traefik-dockerized

After you cloned the repository, create a copy of the example configuration.

$ cp config/traefik.example.yml config/traefik.yml

Open the configuration file. It should look like this:

The configuration file is almost ready-to-use. To use the built-in LetsEncrypt support, adapt the certificate resolvers’ email address.

Afterward, create the Docker network configured in the traefik.yml file.

$ docker network create proxy ca0a9fe39b34b9f17d5c5e938e82ce67b4423e151ae5000eee7754e89116cac1

Additionally, create a JSON file to store the certificate information received by the certificate resolver.

$ touch letsencrypt/acme.json 
$ chmod 600 letsencrypt/acme.json

The docker-compose.yml file is part of the repository and generic for all Traefik deployments. Create a docker-compose.override.yml file to apply custom configurations to the deployment.

$ cp override.example.yml docker-compose.override.yml

Finally, pull the Docker images and start the Traefik instance.

$ docker-compose pull 
Pulling traefik ... done 
$ docker-compose up -d
Creating traefik_traefik_1 ... done

Example Service

Now the Traefik setup can be tested by deploying a sample service using docker-compose. The following example deploys an Nginx container with a Traefik service configuration in the labels section.

Note: To use this example, you need to change the hostname example.com to match your systems' environment. If you changed the docker network, which is used by Traefik to discover services, you also need to change the network.

version: "3.7"
services:
  nginx:
    image: nginx:latest
    networks:
      - proxy
    labels:
      # Traefik configuration, Hostname needs to be changed
      - traefik.http.routers.nginx-http.rule=Host(`example.com`)
      - traefik.http.routers.nginx-http.entrypoints=http
      - traefik.http.routers.nginx-http.middlewares=redirect
      - traefik.http.routers.nginx-https.rule=Host(`example.com`)
      - traefik.http.routers.nginx-https.entrypoints=https
      - traefik.http.routers.nginx-https.tls=true
      - traefik.http.routers.nginx-https.tls.certresolver=letsencrypt
      - traefik.http.services.nginx.loadbalancer.server.port=80
      - traefik.http.middlewares.redirect.redirectscheme.scheme=https
networks:
  proxy:
    external: true

As seen in the manifest, Traefik will configure the access to the service with the properties defined in the labels section. In this example, it’s creating 2 routers (http and https), forwarding requests to the Nginx service on port 80. Additionally, the http router is using the redirect middleware to redirect all requests from http to https. To secure the connection, it’s using the letsencrypt certificate resolver to provide a certificate.

To deploy the example, run the following command:

$ docker-compose up -d 
Creating example-service_nginx_1 ... done

Finally, open your browser on the configured route and see the Nginx welcome page:

Originally published at https://dev.to on September 15, 2020.