Internal Load Balancing in Google Cloud

This provides a template for setting up internal load balancing in Google Cloud. It directly mirrors the tutorial in the GCP Internal Load Balancing Documentation.

To run the example,

  • Log in to gcloud with an account that has permission to create the necessary resources using gcloud init.
  • Optionally update variables.tf to specify a default value for the project_name variable, and check other variables.
  • Run with a command like this:
terraform apply \
	-var="region=us-central1" \
	-var="region_zone=us-central1-b" \
	-var="region_zone_2=us-central1-c" \
	-var="project_name=my-project-id-123" \

After you run terraform apply on this configuration, it will automatically output the internal IP address of the load balancer.

Since the load balancer is only reachable from within the network, ssh into the standalone instance using

gcloud compute ssh --zone us-central1-b standalone-instance-1

Using curl on the IP address given, the LB should respond with a simple header:

<!doctype html><html><body><h1>ilb-instance-X</h1></body></html>