## Compose sample application ### TRAEFIK proxy with GO backend Project structure: ``` . ├── backend │   ├── Dockerfile │   └── main.go ├── compose.yaml └── README.md ``` [_compose.yaml_](compose.yaml) ``` services: frontend: image: traefik:2.2 command: --providers.docker --entrypoints.web.address=:80 --providers.docker.exposedbydefault=false ports: # The HTTP port - "80:80" volumes: # So that Traefik can listen to the Docker events - /var/run/docker.sock:/var/run/docker.sock depends_on: - backend backend: build: backend labels: - "traefik.enable=true" - "traefik.http.routers.go.rule=Path(`/`)" - "traefik.http.services.go.loadbalancer.server.port=80" ``` The compose file defines an application with two services `frontend` and `backend`. When deploying the application, docker compose maps port 80 of the frontend service container to the same port of the host as specified in the file. Make sure port 80 on the host is not already being in use. ## Deploy with docker compose ``` $ docker compose up -d Creating network "traefik-golang_default" with the default driver Building backend Step 1/7 : FROM golang:1.13 AS build 1.13: Pulling from library/golang ... Successfully built 22397f6cd4bc Successfully tagged traefik-golang_backend:latest WARNING: Image for service backend was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`. Pulling frontend (traefik:2.2)... 2.2: Pulling from library/traefik aad63a933944: Pull complete f365f1b91ebb: Pull complete dc367a6045f5: Pull complete ff697159d003: Pull complete Digest: sha256:615483752426932469aa2229ef3f0825b33b3ad7e1326dcd388205cb3a74352e Status: Downloaded newer image for traefik:2.2 Creating traefik-golang_backend_1 ... done Creating traefik-golang_frontend_1 ... done ``` ## Expected result Listing containers must show two containers running and the port mapping as below: ``` $ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES e845f50da9e6 traefik:2.2 "/entrypoint.sh --pr…" 55 seconds ago Up 54 seconds 0.0.0.0:80->80/tcp traefik-golang_frontend_1 e164ffd692e8 traefik-golang_backend "/usr/local/bin/back…" 55 seconds ago Up 54 seconds traefik-golang_backend_1 ``` After the application starts, navigate to `http://localhost:80` in your web browser or run: ``` $ curl localhost:80 ## . ## ## ## == ## ## ## ## ## === /"""""""""""""""""\___/ === { / ===- \______ O __/ \ \ __/ \____\_______/ Hello from Docker! ``` Stop and remove the containers ``` $ docker compose down ```