3. Add an item or two and see that it works as you expect. You can mark items as complete and remove them. Your frontend is successfully storing items in the backend.

At this point, you have a running todo list manager with a few items.

If you take a quick look at your containers, you should see at least one container running that's using the `getting-started` image and on port `3000`. To see your containers, you can use the CLI or Docker Desktop's graphical interface.

{{< tabs >}}
{{< tab name="CLI" >}}

Run the `docker ps` command in a terminal to list your containers.

```console
$ docker ps
```

Output similar to the following should appear.

```console
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                      NAMES
df784548666d        getting-started     "docker-entrypoint.s…"   2 minutes ago       Up 2 minutes        127.0.0.1:3000->3000/tcp   priceless_mcclintock
```

{{< /tab >}}
{{< tab name="Docker Desktop" >}}

In Docker Desktop, select the **Containers** tab to see a list of your containers.

{{< /tab >}}
{{< /tabs >}}

## Summary

In this section, you learned the basics about creating a Dockerfile to build an image. Once you built an image, you started a container and saw the running app.

Related information:

- [Dockerfile reference](/reference/dockerfile/)
- [docker CLI reference](/reference/cli/docker/)

## Next steps

Next, you're going to make a modification to your app and learn how to update your running application with a new image. Along the way, you'll learn a few other useful commands.

{{< button text="Update the application" url="03_updating_app.md" >}}