Summary
The issue at hand is that the API Gateway cannot reach internal services (Service A and Service B) deployed on Google Cloud Run when the ingress is set to internal-and-cloud-load-balancing. This configuration is intended to restrict access to the services, making them internal-only and not publicly reachable.
Root Cause
The root cause of this issue is due to the following reasons:
- Ingress configuration: Setting the ingress to internal-and-cloud-load-balancing restricts access to the services, but it does not automatically allow internal traffic from the API Gateway.
- Network configuration: The services are deployed in the same region and project, but the API Gateway is not able to reach them due to the ingress configuration.
- Missing VPC configuration: The use of a Shared VPC or Serverless VPC Connector may be required to enable internal traffic between the API Gateway and the internal services.
Why This Happens in Real Systems
This issue occurs in real systems due to the following reasons:
- Misconfiguration: Incorrect ingress configuration can lead to restricted access to internal services.
- Lack of understanding: Insufficient knowledge of Google Cloud Run and API Gateway configurations can result in unexpected behavior.
- Complexity: The complexity of cloud-based systems can make it difficult to troubleshoot and identify the root cause of issues.
Real-World Impact
The real-world impact of this issue includes:
- Security risks: Exposing internal services to the public internet can pose security risks.
- Downtime: Inability to access internal services can result in downtime and loss of productivity.
- Performance issues: Incorrect configurations can lead to performance issues and slow response times.
Example or Code
gcloud run services update service-a --ingress internal-and-cloud-load-balancing
gcloud run services update service-b --ingress internal-and-cloud-load-balancingNote: The above code snippet demonstrates how to update the ingress configuration of Service A and Service B to internal-and-cloud-load-balancing.
How Senior Engineers Fix It
Senior engineers fix this issue by:
- Verifying ingress configuration: Ensuring that the ingress configuration is correct and allows internal traffic from the API Gateway.
- Configuring VPC: Setting up a Shared VPC or Serverless VPC Connector to enable internal traffic between the API Gateway and internal services.
- Troubleshooting: Using logging and monitoring tools to identify and troubleshoot issues.
Why Juniors Miss It
Junior engineers may miss this issue due to:
- Lack of experience: Insufficient experience with Google Cloud Run and API Gateway configurations.
- Limited knowledge: Inadequate understanding of cloud-based systems and networking concepts.
- Overlooking details: Failing to verify ingress configurations and VPC settings, leading to unexpected behavior.