Azure Blob Storage

Detailed information on the Azure Blob Store state store component

Creating Azure Storage account

Follow the instructions from the Azure documentation on how to create an Azure Storage Account.

If you wish to create a container for Dapr to use, you can do so beforehand. However, Blob Storage state provider will create one for you automatically if it doesn’t exist.

In order to setup Azure Blob Storage as a state store, you will need the following properties:

  • AccountName: The storage account name. For example: mystorageaccount.
  • AccountKey: Primary or secondary storage key.
  • ContainerName: The name of the container to be used for Dapr state. The container will be created for you if it doesn’t exist.

Create a Dapr component

The next step is to create a Dapr component for Azure Blob Storage.

Create the following YAML file named azureblob.yaml:

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: <NAME>
  namespace: <NAMESPACE>
spec:
  type: state.azure.blobstorage
  metadata:
  - name: accountName
    value: <REPLACE-WITH-ACCOUNT-NAME>
  - name: accountKey
    value: <REPLACE-WITH-ACCOUNT-KEY>
  - name: containerName
    value: <REPLACE-WITH-CONTAINER-NAME>

Example

The following example uses the Kubernetes secret store to retrieve the secrets:

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: <NAME>
  namespace: <NAMESPACE>
spec:
  type: state.azure.blobstorage
  metadata:
  - name: accountName
    value: <REPLACE-WITH-ACCOUNT-NAME>
  - name: accountKey
    secretKeyRef:
      name: <KUBERNETES-SECRET-NAME>
      key: <KUBERNETES-SECRET-KEY>
  - name: containerName
    value: <REPLACE-WITH-CONTAINER-NAME>

Apply the configuration

In Kubernetes

To apply Azure Blob Storage state store to Kubernetes, use the kubectl CLI:

kubectl apply -f azureblob.yaml

Running locally

To run locally, create a components dir containing the YAML file and provide the path to the dapr run command with the flag --components-path.

This state store creates a blob file in the container and puts raw state inside it.

For example, the following operation coming from service called myservice

curl -X POST http://localhost:3500/v1.0/state \
  -H "Content-Type: application/json"
  -d '[
        {
          "key": "nihilus",
          "value": "darth"
        }
      ]'

will create the blob file in the containter with key as filename and value as the contents of file.

Concurrency

Azure Blob Storage state concurrency is achieved by using ETags according to the official documenation.