connect Google App Engine and Google Compute Engine

Question

I created a VM instance in Googl Compute Engine and app in Google App Engine standard environment. I was planning to have my app in App Engine and my database server in Comp

Answer 1

As of April 9, 2019, you can use the serverless VPC connector.

This will allow your App Engine application to connect to other internal resources in your VPC network on the Google Cloud Platform, such as Compute Engine VM instances, Cloud Memorystore instances, and any other resources with an internal IP address.

To create a connector:

$ gcloud services enable vpcaccess.googleapis.com
$ gcloud beta compute networks vpc-access connectors create CONNECTOR_NAME \
--network VPC_NETWORK --region REGION --range IP_RANGE
$ gcloud beta compute networks vpc-access connectors describe CONNECTOR_NAME --region REGION

Note: You can see which IP ranges are currently reserved in the Google Cloud Platform Console. You can choose any unused CIDR /28 IP range to use for your connector, for example, 10.8.0.0/28.

$ gcloud beta compute networks vpc-access connectors create my-vpc-connector \
--region=us-central1 --range=10.8.0.0/28
Create request issued for: [my-vpc-connector]
Waiting for operation [xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx] to complete...done.  
Created connector [my-vpc-connector]

To connect your connector to a service add this to your service's app.yaml file:

vpc_access_connector:
  name: "projects/PROJECT_ID/locations/REGION/connectors/CONNECTOR_NAME"

Deploy the service:

$ gcloud beta app deploy

Note: To use Serverless VPC Access, make sure you use gcloud beta to deploy your service. You can get access to beta commands by running gcloud components install beta.

After you deploy your service, it is able to send requests to Internal IP addresses or DNS Names in order to access resources in your VPC Networks. In case any trouble please allow about one hour or more to let the connectors are propagated completely in the GCP Global Networks.