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Discover step-by-step methods to effectively `protect your metrics endpoint` in Google Kubernetes Engine (GKE) using GCE Ingress.
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How to Hide Endpoints from Outside a GKE Cluster with GCE Ingress

In the landscape of cloud-native applications, protecting sensitive data while allowing necessary access is vital. One common challenge developers face is how to hide certain endpoints from external access while still exposing other services. For instance, suppose you have a user service running in your Google Kubernetes Engine (GKE) cluster with publicly accessible endpoints, including sensitive metrics. This can lead to security vulnerabilities. Today, we’re diving into how to efficiently hide the /metrics endpoint from outside access using the GCE Ingress configuration.

Understanding the Problem

In our scenario, you have a service named user-service exposed through GKE's ingress, configured as follows:

[[See Video to Reveal this Text or Code Snippet]]

Your user service provides metrics at the /metrics endpoint, but you want requests from outside the cluster to receive a 404 Not Found response if they access this endpoint. This is a common requirement to ensure that sensitive operational data is only available internally or to authorized users.

The Solution: Structuring the Ingress

To solve the issue of hiding sensitive endpoints, we can leverage GCE Ingress's capability to specify multiple paths in the configuration. When you define multiple paths, requests will prioritize matching the most specific path. Here’s how you can modify your ingress configuration:

Updated Ingress Configuration

To achieve the desired outcome, you can specify a dedicated path for the metrics endpoint which responds with a 404 error using GKE's default backend service. Here’s the revised configuration:

[[See Video to Reveal this Text or Code Snippet]]

Key Points of This Configuration

Multiple Path Definitions: By including separate path rules for /users/* and /users/metrics/*, we ensure that requests targeting the metrics endpoint are handled independently.

Default Backend Service: The default-http-backend in GKE is set up to serve 404 responses. This ensures that any request made to /users/metrics/* will return a 404 error, effectively hiding this endpoint from outside users.

Specifying Service Ports: Make sure to point the path /users/metrics/* to the default backend service, ensuring it listens on port 80, which is common for HTTP traffic.

How It Works

With the above configuration, when a user or system attempts to access example.com/users/metrics, they will receive a 404 status code. This effectively shields your metrics from public access while enabling other services within the user-service to function normally.

Conclusion

Protecting sensitive endpoints in a cloud environment is crucial for maintaining security. By structuring your Ingress configuration correctly, you can effectively hide specific endpoints while ensuring that the rest of your application operates as intended. Remember to make use of GKE's capabilities like the default-http-backend to streamline the process and shield your metrics from unwanted attention.

Implementing these small but impactful changes can greatly enhance the security posture of your applications deployed in GKE. Happy deploying!