How do you trigger DAGs externally using Pub/Sub or HTTP?
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Triggering via HTTP (REST API):
Enable Airflow REST API in Composer.
Use a POST request to this endpoint:
https://<composer-url>/api/v1/dags/<dag_id>/dagRuns
Provide JSON payload:
"conf": {
"key": "value"
Authentication is required using OAuth token or service account with appropriate IAM roles.
✅ Triggering via Pub/Sub:
Create a Pub/Sub topic.
Deploy a Cloud Function subscribed to the topic.
The Cloud Function sends an HTTP POST to Airflow’s API to trigger the DAG.
Example in Python (Cloud Function):
def trigger_dag(event, context):
import requests
import google.auth
credentials, _ = google.auth.default()
headers = {'Authorization': f'Bearer {credentials.token}'}
payload = {"conf": {"run_id": context.event_id}}
requests.post("https://<composer-url>/api/v1/dags/my_dag/dagRuns", headers=headers, json=payload)
This setup allows external systems to publish a message, which then triggers the DAG dynamically.
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