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Discover how to effectively use the same hostname with multiple Kubernetes ingress resources across different namespaces. Understanding the ingress configuration can solve routing issues.
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Using the Same Hostname with Multiple Kubernetes Ingress Resources

When managing Kubernetes clusters, particularly with the NGINX ingress controller, you might encounter a situation where you wish to use the same hostname across different namespaces. A common example is wanting to access resources in two distinct namespaces, such as monitoring and myapp, using the same hostname like example.com. But how does this work in practice, and what configurations are necessary to make it work effectively?

In this guide, we will explore how to properly configure multiple Ingress resources to ensure they function correctly, even when utilizing the same hostname.

Understanding the Problem

The challenge arises when you have multiple Ingress configurations that are meant to route traffic based on specific paths but share a common hostname. For instance:

You want to access your main application with the URL example.com.

You also want to access Grafana under the path example.com/grafana.

Unfortunately, if misconfigured, you may find that accessing example.com/grafana could route you back to the application instead of Grafana.

An Example Scenario

Consider the following two Ingress configurations:

Ingress for Your Application (myapp namespace):

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

Ingress for Grafana (monitoring namespace):

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

If you try to curl example.com/grafana and it still redirects you to the main application, then there are a couple of potential issues you need to address.

Solutions to the Ingress Configuration Issue

1. Adjust the Path Configuration

One of the first adjustments you can make is to simplify the path for your Grafana Ingress. Using a regex isn’t necessary when you already have pathType: Prefix, as it can automatically match paths starting with /grafana. Here’s how you can revise your Grafana Ingress:

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

2. Validate Namespace Resources

The second critical step is to ensure that all resources required by Grafana – such as deployment, service, secrets, and any other related resources – are present within the same namespace monitoring. Mismatched namespaces can lead to routing issues, as Kubernetes expects the services to be in specified namespaces when Enabling Ingress.

Conclusion

Yes, it is absolutely possible to use the same hostname with multiple Ingress resources across different namespaces in Kubernetes. By streamlining your path configurations and ensuring that your related services are accurately set up within the correct namespace, you can effectively route traffic to both your main application and your Grafana instance seamlessly.

With these simple adjustments, you should be able to enjoy the flexibility offered by Kubernetes Ingress without running into routing conflicts!

If you have any further questions or if you encounter challenges, feel free to ask or seek community advice.