111 lines
3.2 KiB
Markdown
111 lines
3.2 KiB
Markdown
# Quick Start
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A Simple Use Case Using Docker
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{: .subtitle }
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## Launch Traefik With the Docker Provider
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Create a `docker-compose.yml` file where you will define a `reverse-proxy` service that uses the official Traefik image:
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```yaml
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version: '3'
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services:
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reverse-proxy:
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# The official v2 Traefik docker image
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image: traefik:v2.5
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# Enables the web UI and tells Traefik to listen to docker
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command: --api.insecure=true --providers.docker
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ports:
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# The HTTP port
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- "80:80"
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# The Web UI (enabled by --api.insecure=true)
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- "8080:8080"
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volumes:
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# So that Traefik can listen to the Docker events
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- /var/run/docker.sock:/var/run/docker.sock
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```
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**That's it. Now you can launch Traefik!**
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Start your `reverse-proxy` with the following command:
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```shell
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docker-compose up -d reverse-proxy
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```
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You can open a browser and go to [http://localhost:8080/api/rawdata](http://localhost:8080/api/rawdata) to see Traefik's API rawdata (we'll go back there once we have launched a service in step 2).
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## Traefik Detects New Services and Creates the Route for You
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Now that we have a Traefik instance up and running, we will deploy new services.
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Edit your `docker-compose.yml` file and add the following at the end of your file.
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```yaml
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# ...
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whoami:
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# A container that exposes an API to show its IP address
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image: traefik/whoami
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labels:
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- "traefik.http.routers.whoami.rule=Host(`whoami.docker.localhost`)"
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```
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The above defines `whoami`: a simple web service that outputs information about the machine it is deployed on (its IP address, host, and so on).
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Start the `whoami` service with the following command:
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```shell
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docker-compose up -d whoami
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```
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Go back to your browser ([http://localhost:8080/api/rawdata](http://localhost:8080/api/rawdata)) and see that Traefik has automatically detected the new container and updated its own configuration.
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When Traefik detects new services, it creates the corresponding routes so you can call them ... _let's see!_ (Here, we're using curl)
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```shell
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curl -H Host:whoami.docker.localhost http://127.0.0.1
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```
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_Shows the following output:_
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```yaml
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Hostname: a656c8ddca6c
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IP: 172.27.0.3
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#...
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```
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## More Instances? Traefik Load Balances Them
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Run more instances of your `whoami` service with the following command:
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```shell
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docker-compose up -d --scale whoami=2
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```
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Go back to your browser ([http://localhost:8080/api/rawdata](http://localhost:8080/api/rawdata)) and see that Traefik has automatically detected the new instance of the container.
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Finally, see that Traefik load-balances between the two instances of your service by running the following command twice:
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```shell
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curl -H Host:whoami.docker.localhost http://127.0.0.1
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```
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The output will show alternatively one of the followings:
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```yaml
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Hostname: a656c8ddca6c
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IP: 172.27.0.3
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#...
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```
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```yaml
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Hostname: s458f154e1f1
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IP: 172.27.0.4
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# ...
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```
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!!! question "Where to Go Next?"
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Now that you have a basic understanding of how Traefik can automatically create the routes to your services and load balance them, it is time to dive into [the documentation](/) and let Traefik work for you!
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