Apply Terraform

Step 2 — Apply Terraform (base infrastructure)

terraform init
terraform plan
terraform apply

Expect roughly 20 resources ( AWS AWS
Amazon Web Services — the cloud platform used throughout this walkthrough. VPC/network/compute/endpoints + GCP GCP
Google Cloud Platform — the cloud provider connected to AWS via Interconnect multicloud in this walkthrough. network/compute + DX Gateway DX Gateway
Direct Connect Gateway — an AWS resource that connects a Virtual Private Gateway (or Transit Gateway) to a Direct Connect or Interconnect link. Created by Terraform in this demo. ).

Save the outputs — you will reference them in later steps:

terraform output

Key outputs

Output	Used in
aws_dx_gateway_id	AWS console Step 3 — select Direct Connect Gateway
aws_allowed_prefix_for_gcp	Informational — AWS CIDR advertised to GCP
gcp_advertised_routes_for_transport	gcloud Step 4 — —advertised-routes
gcp_vpc_network_name	gcloud Steps 4–5 — —network
gcp_transport_name	gcloud Steps 4–5 — transport name
aws_instance_private_ip / gce_instance_private_ip	Step 7 — ping targets

Note

aws_dx_gateway_association may show pending until Steps 4–5 complete. It can reach associated while the interconnect is still pending — that is normal and a good sign.

Output reference

Output	Description
aws_dx_gateway_id	DX Gateway for Interconnect creation
aws_allowed_prefix_for_gcp	AWS CIDR sent toward GCP
gcp_advertised_routes_for_transport	GCP CIDR for —advertised-routes
gcp_vpc_network_name	GCP network name for gcloud
gcp_transport_name	Transport resource name
aws_instance_id	EC2 ID for SSM
aws_instance_private_ip	EC2 private IP (ping target from GCP)
gce_instance_name / gce_instance_zone	GCE SSH via IAP
gce_instance_private_ip	GCE private IP (ping target from AWS)
gce_ssh_private_key	Generated SSH private key for GCE (sensitive)
gce_ssh_public_key	Matching public key on the VM