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Scale applications based on Google Cloud Platform Pub/Sub.
Trigger Specification
This specification describes the gcp-pubsub trigger for Google Cloud Platform Pub/Sub.
triggers:
- type: gcp-pubsub
metadata:
subscriptionSize: "5" # Optional - Default is 5
subscriptionName: "mysubscription" # Required
credentialsFromEnv: GOOGLE_APPLICATION_CREDENTIALS_JSON # Required
The Google Cloud Platform (GCP) Pub/Sub trigger allows you to scale based on the number of messages in your Pub/Sub subscription.
The credentialsFromEnv property maps to the name of an environment variable in the scale target (scaleTargetRef) that contains the service account credentials (JSON). KEDA will use those to connect to Google Cloud Platform and collect the required stack driver metrics in order to read the number of messages in the Pub/Sub subscription.
subscriptionName defines the subscription that should be monitored. The subscriptionSize determines the target average which the deployment will be scaled on. The default subscriptionSize is 5.
Here’s an example.
Authentication Parameters
You can use TriggerAuthentication CRD to configure the authenticate by providing the service account credentials in JSON.
Credential based authentication:
GoogleApplicationCredentials- Service account credentials in JSON.
Example
apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
name: pubsub-scaledobject
namespace: keda-pubsub-test
spec:
scaleTargetRef:
name: keda-pubsub-go
triggers:
- type: gcp-pubsub
metadata:
subscriptionSize: "5"
subscriptionName: "mysubscription" # Required
credentialsFromEnv: GOOGLE_APPLICATION_CREDENTIALS_JSON # Required
Example using TriggerAuthentication
apiVersion: keda.sh/v1alpha1
kind: TriggerAuthentication
metadata:
name: keda-trigger-auth-gcp-credentials
spec:
secretTargetRef:
- parameter: GoogleApplicationCredentials
name: pubsub-secret # Required. Refers to the name of the secret
key: GOOGLE_APPLICATION_CREDENTIALS_JSON # Required.
---
apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
name: pubsub-scaledobject
spec:
scaleTargetRef:
name: keda-pubsub-go
triggers:
- type: gcp-pubsub
authenticationRef:
name: keda-trigger-auth-gcp-credentials
metadata:
subscriptionName: "input" # Required