How to Get Static IP Address for Google Cloud Functions

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Google Cloud Functions do not natively support static IP addresses, as they are designed to be ephemeral and to scale automatically. However, you can work around this limitation using a VPC Connector and a Cloud NAT gateway with a static IP address.

Follow the below steps!

Step 1: Enable the required APIs

  • Cloud Functions API
  • VPC Connector API
  • Cloud NAT API

Step 2: Create a VPC network

Step 3: Reserve a static IP address

Step 4: Create a Cloud NAT gateway

  • Go to the Cloud NAT page in the Google Cloud Console: https://console.cloud.google.com/networking/routes/nat/list
  • Click “Create NAT gateway” and configure the gateway.
  • In the “Cloud Router” section, select “Create a Cloud Router”.
  • Select the static IP address you reserved earlier in the “NAT IP addresses” section.

Step 5: Create a Serverless VPC Connector

Step 6: Deploy your Cloud Function with the VPC Connector

When deploying the Cloud Function, specify the --vpc-connector flag and provide the full name of the VPC Connector you created, for example:

gcloud functions deploy 
              FUNCTION_NAME --runtime RUNTIME --trigger-http 
               --allow-unauthenticated --vpc-connector 
              projects/PROJECT_ID/locations/REGION/connectors/CONNECTOR_NAME

Replace FUNCTION_NAME, RUNTIME, PROJECT_ID, REGION, and CONNECTOR_NAME with your specific information.

With this setup, all outgoing traffic from your Cloud Function will go through the VPC Connector and the Cloud NAT gateway using the static IP address you reserved.

Note that this does not apply to incoming traffic; you cannot assign a static IP address to incoming traffic for a Cloud Function.

That’s it.
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