Answer By Chatgpt
The best approach to meet the requirements of connecting a Compute Engine instance in a different VPC to an application running in Google Kubernetes Engine (GKE) is:
Option C:
- In GKE, create a Service of type LoadBalancer that uses the application's Pods as backend.
- Add an annotation to this service:
cloud.google.com/load-balancer-type: Internal. - Peer the two VPCs together.
- Configure the Compute Engine instance to use the address of the load balancer that has been created.
Explanation:
- Service of type LoadBalancer: This option creates an external load balancer that will expose the GKE application and allow external connections to it.
- Annotation for Internal Load Balancer: By adding the annotation
cloud.google.com/load-balancer-type: Internal, the load balancer is restricted to the internal network, ensuring that traffic from within the same region (in different VPCs) can reach the GKE application securely and without exposing it to the public internet. - VPC Peering: Since the Compute Engine instance is in a different VPC, you need to peer the VPCs to allow communication between them.
- Compute Engine Configuration: Finally, configuring the Compute Engine instance to use the internal IP address of the load balancer ensures that the instance can communicate with the GKE application over the internal network.
This option minimizes effort by using a managed internal load balancer, which simplifies routing traffic between the VPCs and handles scaling automatically.