Notice
As of now, this Azure Blob Storage scaler scales based on the count of the blobs in a container as opposed to the Azure Functions behavior where code is only triggered on new blobs.
Azure Blob Storage Latest
Scale applications based on the count of blobs in a given Azure Blob Storage container.
Trigger Specification
This specification describes the azure-blob trigger for Azure Blob Storage. It scales based on the count of blobs in a given blob storage container and assumes the worker is responsible for clearing the container by delete/move the blobs once the blob processing completed.
triggers:
- type: azure-blob
metadata:
blobContainerName: functions-blob # Required: Name of Azure Blob Storage container
blobCount: '5' # Optional. Amount of blobs to scale out on. Default: 5 blobs
connectionFromEnv: STORAGE_CONNECTIONSTRING_ENV_NAME # Optional if TriggerAuthentication defined with pod identity or connection string authentication.
blobPrefix: # Optional. Prefix for the Blob. Use this to specifiy sub path for the blobs if required. Default : ""
blobDelimiter: # Optional. Delimiter for identifying the blob Prefix. Default: "/"
The connectionFromEnv value is the name of the environment variable your deployment uses to get the connection string. This is usually resolved from a Secret V1 or a ConfigMap V1 collections. env and envFrom are both supported.
Authentication Parameters
You can authenticate by using pod identity or connection string authentication.
Connection String Authentication:
connection- Connection string for Azure Storage Account
Example
apiVersion: keda.sh/v1alpha1
kind: TriggerAuthentication
metadata:
name: azure-blob-auth
spec:
podIdentity:
provider: azure
---
apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
name: azure-blob-scaledobject
namespace: default
spec:
scaleTargetRef:
name: azureblob-function
triggers:
- type: azure-blob
metadata:
# Required
blobContainerName: functionsblob
# Optional
blobCount: "5" # default 5
blobPrefix: blobsubpath # Default : ""
blobDelimiter: "/" # Default: "/"
authenticationRef:
name: azure-blob-auth # authenticationRef would need either podIdentity or define a connection parameter