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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