traefik/docs/content/user-guides/docker-compose/basic-example/index.md

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---
title: "Traefik Docker Documentation"
description: "This guide covers a Docker Compose file exposing a service using the Docker provider in Traefik Proxy. Read the technical documentation."
---
# Docker Compose example
In this section, we quickly go over a Docker Compose file exposing a service using the Docker provider.
This will also be used as a starting point for the other Docker Compose guides.
## Setup
- Edit a `docker-compose.yml` file with the following content:
```yaml
--8<-- "content/user-guides/docker-compose/basic-example/docker-compose.yml"
```
??? Networking
The Traefik container has to be attached to the same network as the containers to be exposed.
If no networks are specified in the Docker Compose file, Docker creates a default one that allows Traefik to reach the containers defined in the same file.
You can [customize the network](https://docs.docker.com/compose/networking/#specify-custom-networks "Link to docs about custom networks with Docker Compose") as described in the example below.
You can use a [pre-existing network](https://docs.docker.com/compose/networking/#use-a-pre-existing-network "Link to Docker Compose networking docs") too.
```yaml
version: "3.3"
networks:
traefiknet: {}
services:
traefik:
image: "traefik:v2.10"
...
networks:
- traefiknet
whoami:
image: "traefik/whoami"
...
networks:
- traefiknet
```
- Replace `whoami.localhost` by your **own domain** within the `traefik.http.routers.whoami.rule` label of the `whoami` service.
- Run `docker-compose up -d` within the folder where you created the previous file.
- Wait a bit and visit `http://your_own_domain` to confirm everything went fine.
You should see the output of the whoami service. Something similar to:
```text
Hostname: d7f919e54651
IP: 127.0.0.1
IP: 192.168.64.2
GET / HTTP/1.1
Host: whoami.localhost
User-Agent: curl/7.52.1
Accept: */*
Accept-Encoding: gzip
X-Forwarded-For: 192.168.64.1
X-Forwarded-Host: whoami.localhost
X-Forwarded-Port: 80
X-Forwarded-Proto: http
X-Forwarded-Server: 7f0c797dbc51
X-Real-Ip: 192.168.64.1
```
## Details
- As an example, we use [whoami](https://github.com/traefik/whoami "Link to the GitHub repo of whoami") (a tiny Go server that prints OS information and HTTP request to output) which was used to define our `simple-service` container.
- We define an entry point, along with the exposure of the matching port within Docker Compose, which allow us to "open and accept" HTTP traffic:
```yaml
command:
# Traefik will listen to incoming request on the port 80 (HTTP)
- "--entrypoints.web.address=:80"
ports:
- "80:80"
```
- We expose the Traefik API to be able to check the configuration if needed:
```yaml
command:
# Traefik will listen on port 8080 by default for API request.
- "--api.insecure=true"
ports:
- "8080:8080"
```
!!! Note
If you are working on a remote server, you can use the following command to display configuration (require `curl` & `jq`):
```bash
curl -s 127.0.0.1:8080/api/rawdata | jq .
```
- We allow Traefik to gather configuration from Docker:
```yaml
traefik:
command:
# Enabling Docker provider
- "--providers.docker=true"
# Do not expose containers unless explicitly told so
- "--providers.docker.exposedbydefault=false"
volumes:
- "/var/run/docker.sock:/var/run/docker.sock:ro"
whoami:
labels:
# Explicitly tell Traefik to expose this container
- "traefik.enable=true"
# The domain the service will respond to
- "traefik.http.routers.whoami.rule=Host(`whoami.localhost`)"
# Allow request only from the predefined entry point named "web"
- "traefik.http.routers.whoami.entrypoints=web"
```
{!traefik-for-business-applications.md!}