Cloud Functions generations (1st vs 2nd) in GCP - CLI Comparison

Introduction

Cloud Functions let you run small pieces of code in the cloud without managing servers. The first generation is simple and quick to start, while the second generation offers more power and flexibility for bigger needs.

When you want to quickly run code in response to events like file uploads or HTTP requests without managing servers.

When you need to handle more complex workloads that require more memory or longer execution times.

When you want to connect your function to more cloud services with better control over networking.

When you want to use the latest runtime environments and features for your functions.

When you want to deploy functions that can scale automatically based on demand.

Commands

Deploys a first generation Cloud Function named 'my-function' using Python 3.9 runtime triggered by HTTP requests.

Terminal

gcloud functions deploy my-function --runtime python39 --trigger-http --gen1

Expected Output

Deploying function (may take a while)...done.

availableMemoryMb: 256

entryPoint: my_function

httpsTrigger:

  url: https://REGION-PROJECT_ID.cloudfunctions.net/my-function

runtime: python39

status: ACTIVE

→

--runtime - Specifies the language runtime version.

→

--trigger-http - Sets the function to be triggered by HTTP requests.

→

--gen1 - Specifies deployment as first generation Cloud Function.

Deploys a second generation Cloud Function named 'my-function' using Python 3.9 runtime triggered by HTTP requests in the us-central1 region.

Terminal

gcloud functions deploy my-function --runtime python39 --trigger-http --gen2 --region us-central1

Expected Output

Deploying function (may take a while)...done.

availableMemoryMb: 256

entryPoint: my_function

httpsTrigger:

  url: https://us-central1-PROJECT_ID.cloudfunctions.net/my-function

runtime: python39

serviceConfig:

  environmentVariables: {}

status: ACTIVE

→

--runtime - Specifies the language runtime version.

→

--trigger-http - Sets the function to be triggered by HTTP requests.

→

--gen2 - Specifies deployment as second generation Cloud Function.

→

--region - Specifies the region for the function deployment.

Shows details about the deployed second generation Cloud Function named 'my-function' in the us-central1 region.

Terminal

gcloud functions describe my-function --region us-central1

Expected Output

name: projects/PROJECT_ID/locations/us-central1/functions/my-function

status: ACTIVE

runtime: python39

httpsTrigger:

  url: https://us-central1-PROJECT_ID.cloudfunctions.net/my-function

serviceConfig:

  environmentVariables: {}

  availableMemoryMb: 256

  timeoutSeconds: 60

→

--region - Specifies the region of the function to describe.

Key Concept

If you remember nothing else from this pattern, remember: first generation Cloud Functions are simple and fast to deploy, while second generation Cloud Functions offer more power, control, and newer features.

Common Mistakes

Deploying a second generation function without specifying the region flag.

Second generation functions require a region to be set, otherwise deployment fails or defaults to an unintended region.

Always include the --region flag with a valid region when deploying second generation Cloud Functions.

Using the --gen1 flag with features only supported in second generation functions.

First generation functions do not support newer features like VPC connectors or longer timeouts, causing deployment errors.

Use --gen2 flag when you need advanced features and ensure your code and triggers are compatible.

Summary

Use 'gcloud functions deploy' with --gen1 or --gen2 to choose the Cloud Functions generation.

First generation is quick and simple, good for basic event-driven code.

Second generation supports more memory, longer timeouts, and better networking options.

Always specify the region for second generation functions.

Use 'gcloud functions describe' to check function details after deployment.