GcpConceptBeginner · 3 min read

What is Eventarc in GCP: Overview and Use Cases

Eventarc in Google Cloud Platform (GCP) is a service that routes events from various sources to cloud services like Cloud Run or Cloud Functions. It helps you build event-driven applications by connecting events to the right targets automatically.

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How It Works

Think of Eventarc as a smart mail sorter for your cloud events. When something happens, like a file upload or a database change, Eventarc catches that event and sends it to the right place, such as a Cloud Run service or Cloud Function, to handle it.

It listens to many event sources, including Google Cloud services and custom apps, and uses rules to decide where each event should go. This way, your app reacts automatically to changes without you having to check constantly.

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Example

This example shows how to create an Eventarc trigger that listens for new files in a Cloud Storage bucket and sends the event to a Cloud Run service.

bash

gcloud eventarc triggers create my-trigger \
  --destination-run-service=my-cloud-run-service \
  --destination-run-region=us-central1 \
  --event-filters="type=google.cloud.storage.object.v1.finalized" \
  --event-filters="bucket=my-bucket" \
  --service-account=my-service-account@project.iam.gserviceaccount.com

Output

Created trigger [my-trigger].

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When to Use

Use Eventarc when you want your cloud apps to respond automatically to events without manual checks. It is great for building event-driven architectures where services react to changes like file uploads, database updates, or custom app events.

For example, you can use Eventarc to start image processing when a photo is uploaded, update analytics when data changes, or trigger workflows based on user actions.

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Key Points

Eventarc routes events from many sources to cloud services automatically.
It supports Google Cloud services and custom event sources.
It simplifies building event-driven apps without polling or manual checks.
It integrates well with Cloud Run, Cloud Functions, and Workflows.

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Key Takeaways

Eventarc routes cloud events to services like Cloud Run automatically.

It helps build event-driven apps that react to changes instantly.

Supports many event sources including Google Cloud and custom apps.

Ideal for workflows triggered by file uploads, database changes, or user actions.