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Hello world Traefik example with microservices

This repo contains two trivial microservices: microservice/ and microservice2. They both return "hello world" as JSON answer microservice2 also logs the requestor's Host header and requested URL.

How to build the containers? -> make -images.sh.

How to run them?

docker-compose up -d

What does it show?

The docker-compose.yml file shows how to bind the microservices into traefik. Traefik learns about new microservices via labels in the docker-compose.yml file. More info at: https://doc.traefik.io/traefik/user-guides/docker-compose/basic-example/

How to test if it works?

If you take a look at the docker-compose.yml file, then you will see two different hostname (HTTP Hostname header) specified in the config for the two containers:

      - "traefik.http.routers.hello-traefik2.rule=Host(`hello-traefik.localhost`)"
      - "traefik.http.routers.hello-traefik2.rule=Host(`hello-traefik2.localhost`)"

Here, hello-traefik.localhost is the Host header. So, you can query the microservice like this from the outer server, which runs the containers:

curl --header 'Host:hello-traefik.localhost' http://localhost/
curl --header 'Host:hello-traefik2.localhost' http://localhost/

You should see microservice and microservice2's respective answers.