How to use Google Cloud Functions

· Category: Cloud Computing

Short answer

Cloud Functions lets you run single-purpose functions in response to GCP events without managing servers.

Steps

  1. Write a function:
def hello_world(request):
    return "Hello, World!"
  1. Deploy:
gcloud functions deploy hello_world --runtime python311 --trigger-http --allow-unauthenticated
  1. Set triggers (HTTP, Pub/Sub, Cloud Storage, Firestore).
  2. Monitor with Cloud Logging and Cloud Monitoring.

Tips

  • Use environment variables for configuration.
  • Minimize dependencies to reduce cold start time.
  • Use Cloud Run for longer-running or containerized workloads.

Common issues

  • Cold starts affect HTTP latency; keep functions warm if needed.
  • Memory limits: choose the right tier for your workload.