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Setup Redis Streams

Creating a Redis instance

Dapr can use any Redis instance - containerized, running on your local dev machine, or a managed cloud service, provided the version of Redis is 5.0.0 or later. If you already have a Redis instance > 5.0.0 installed, move on to the Configuration section.

Running locally

The Dapr CLI will automatically create and setup a Redis Streams instance for you when you. The Redis instance will be installed via Docker when you run dapr init, and the component file will be setup with dapr run.

Creating a Redis instance in your Kubernetes Cluster using Helm

We can use Helm to quickly create a Redis instance in our Kubernetes cluster. This approach requires Installing Helm.

Install Redis into your cluster: helm install redis stable/redis. Note that we're explicitly setting an image tag to get a version greater than 5, which is what Dapr' pub/sub functionality requires.
Run kubectl get pods to see the Redis containers now running in your cluster.

Add redis-master:6379 as the redisHost in your redis.yaml file. For example:

    metadata:
    - name: redisHost
      value: redis-master:6379

Next, we'll get our Redis password, which is slightly different depending on the OS we're using:
- Windows: Run kubectl get secret --namespace default redis -o jsonpath="{.data.redis-password}" > encoded.b64, which will create a file with your encoded password. Next, run certutil -decode encoded.b64 password.txt, which will put your redis password in a text file called password.txt. Copy the password and delete the two files.
- Linux/MacOS: Run kubectl get secret --namespace default redis -o jsonpath="{.data.redis-password}" | base64 --decode and copy the outputted password.
Add this password as the redisPassword value in your redis.yaml file. For example:
```
    - name: redisPassword
      value: "lhDOkwTlp0"
```

Other ways to create a Redis Database

Configuration

To setup Redis, you need to create a component for pubsub.redis.

The following yaml files demonstrates how to define each. Note: yaml files below illustrate secret management in plain text. In a production-grade application, follow secret management instructions to securely manage your secrets.

Configuring Redis Streams for Pub/Sub

Create a file called pubsub.yaml, and paste the following:

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: messagebus
spec:
  type: pubsub.redis
  metadata:
  - name: redisHost
    value: <HOST>
  - name: redisPassword
    value: <PASSWORD>

Apply the configuration

Kubernetes

kubectl apply -f pubsub.yaml

Standalone

By default the Dapr CLI creates a local Redis instance when you run dapr init. When you run an app using dapr run, the component file will automatically be created for you in a components dir in your current working directory.

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