mirror of https://github.com/dapr/docs.git
147 lines
5.9 KiB
Markdown
147 lines
5.9 KiB
Markdown
# Redis and Dapr
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Dapr can use Redis in two ways:
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1. For state persistence and restoration
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2. For enabling pub/sub async style message delivery
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## Creating a Redis Store
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Dapr can use any Redis instance - containerized, running on your local dev machine, or a managed cloud service. If you already have a Redis store, move on to the [Configuration](#configuration) section.
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### Option 1: Creating a Redis Cache in your Kubernetes Cluster using Helm
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We can use [Helm](https://helm.sh/) to quickly create a Redis instance in our Kubernetes cluster. This approach requires [Installing Helm v3](https://github.com/helm/helm#install).
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1. Install Redis into your cluster:
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```bash
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helm repo add bitnami https://charts.bitnami.com/bitnami
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helm install redis bitnami/redis
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```
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> Note that you need a Redis version greater than 5, which is what Dapr' pub/sub functionality requires. If you're intending on using Redis as just a state store (and not for pub/sub), also a lower version can be used.
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2. Run `kubectl get pods` to see the Redis containers now running in your cluster.
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3. Add `redis-master:6379` as the `redisHost` in your [redis.yaml](#configuration) file. For example:
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```yaml
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metadata:
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- name: redisHost
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value: redis-master:6379
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```
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4. Next, we'll get our Redis password, which is slightly different depending on the OS we're using:
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- **Windows**: Run below commands
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```powershell
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# Create a file with your encoded password.
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kubectl get secret --namespace default redis -o jsonpath="{.data.redis-password}" > encoded.b64
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# put your redis password in a text file called `password.txt`.
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certutil -decode encoded.b64 password.txt
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# Copy the password and delete the two files.
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```
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- **Windows**: If you are using Powershell, it would be even easier.
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```powershell
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PS C:\> $base64pwd=kubectl get secret --namespace default redis -o jsonpath="{.data.redis-password}"
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PS C:\> $redispassword=[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($base64pwd))
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PS C:\> $base64pwd=""
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PS C:\> $redispassword
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```
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- **Linux/MacOS**: Run `kubectl get secret --namespace default redis -o jsonpath="{.data.redis-password}" | base64 --decode` and copy the outputted password.
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Add this password as the `redisPassword` value in your [redis.yaml](#configuration) file. For example:
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```yaml
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metadata:
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- name: redisPassword
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value: lhDOkwTlp0
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```
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### Option 2: Creating an Azure Cache for Redis service
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> **Note**: This approach requires having an Azure Subscription.
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1. Open the [Azure Portal](https://ms.portal.azure.com/#create/Microsoft.Cache) to start the Azure Redis Cache creation flow. Log in if necessary.
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1. Fill out the necessary information
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1. Click "Create" to kickoff deployment of your Redis instance.
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1. Once your instance is created, you'll need to grab your access key. Navigate to "Access Keys" under "Settings" and copy your key.
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1. We need the hostname of your Redis instance, which we can retrieve from the "Overview" in Azure. It should look like `xxxxxx.redis.cache.windows.net:6380`.
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1. Finally, we need to add our key and our host to a `redis.yaml` file that Dapr can apply to our cluster. If you're running a sample, you'll add the host and key to the provided `redis.yaml`. If you're creating a project from the ground up, you'll create a `redis.yaml` file as specified in [Configuration](#configuration).
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As the connection to Azure is encrypted, make sure to add the following block to the `metadata` section of your `redis.yaml` file.
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```yaml
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metadata:
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- name: enableTLS
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value: "true"
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```
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> **NOTE:** Dapr pub/sub uses [Redis Streams](https://redis.io/topics/streams-intro) that was introduced by Redis 5.0, which isn't currently available on Azure Managed Redis Cache. Consequently, you can use Azure Managed Redis Cache only for state persistence.
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### Other options to create a Redis Database
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- [AWS Redis](https://aws.amazon.com/redis/)
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- [GCP Cloud MemoryStore](https://cloud.google.com/memorystore/)
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## Configuration
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Dapr can use Redis as a `statestore` component (for state persistence and retrieval) or as a `messagebus` component (for pub/sub). 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](../../concepts/secrets/README.md) instructions to securely manage your secrets.
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### Configuring Redis for State Persistence and Retrieval
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Create a file called redis-state.yaml, and paste the following:
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```yaml
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apiVersion: dapr.io/v1alpha1
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kind: Component
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metadata:
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name: statestore
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namespace: default
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spec:
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type: state.redis
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metadata:
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- name: redisHost
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value: <HOST>
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- name: redisPassword
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value: <PASSWORD>
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```
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### Configuring Redis for Pub/Sub
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Create a file called redis-pubsub.yaml, and paste the following:
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```yaml
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apiVersion: dapr.io/v1alpha1
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kind: Component
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metadata:
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name: messagebus
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namespace: default
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spec:
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type: pubsub.redis
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metadata:
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- name: redisHost
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value: <HOST>
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- name: redisPassword
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value: <PASSWORD>
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```
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## Apply the configuration
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### Kubernetes
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```bash
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kubectl apply -f redis-state.yaml
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kubectl apply -f redis-pubsub.yaml
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```
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### Self Hosted Mode
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By default the Dapr CLI creates a local Redis instance when you run `dapr init`. However, if you want to configure a different Redis instance, create a `components` dir containing the YAML file and provide the path to the `dapr run` command with the flag `--components-path`.
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If you initialized Dapr using `dapr init --slim`, the Dapr CLI did not create a Redis instance or a default configuration file for it. Follow [these instructions](#Creating-a-Redis-Store) to create a Redis store. Create the `redis.yaml` following the configuration [instructions](#Configuration) in a `components` dir and provide the path to the `dapr run` command with the flag `--components-path`.
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