# Using Kafka Streams with internal topics

This guide will show you how to use [Kafka Streams](https://kafka.apache.org/documentation/streams/) with internal topics.

## Enable Kafka Streams in your application

> **.nais/app.yaml**
> ```yaml
>   apiVersion: nais.io/v1alpha1
>   kind: Application
>   metadata:
>     name: <MY-APP>
>     namespace: <MY-TEAM>
>     labels:
>       team: <MY-TEAM>
>   spec:
>     kafka:
>       pool: <MY-POOL>
>       streams: true
> ```

Select a `pool` from one of the [available pools](/persistence/kafka/reference/pools.md).

## Configure your application

When you do this you **must** configure Kafka Streams by setting the property `application.id` to a value that starts
with the value of the env var `KAFKA_STREAMS_APPLICATION_ID`, which will be injected into your pod automatically.

## Apply the application

**Automatically**

Add the file to your application repository to deploy with [Nais github action](/build/how-to/build-and-deploy.md).

**Manually**

```bash
kubectl apply -f ./nais/app.yaml --namespace=<MY-TEAM> --context=<MY-ENV>
```