Скачать или смотреть Resolving Certificate Issues with Cert-Manager and NGINX Ingress Controller in GKE

Learn how to effectively resolve certificate issues while using Cert-Manager and the NGINX Ingress Controller on Google Kubernetes Engine (GKE) with this comprehensive guide.
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Resolving Certificate Issues with Cert-Manager and NGINX Ingress Controller in GKE

When working with Kubernetes, especially Google Kubernetes Engine (GKE), setting up SSL/TLS certificates can sometimes present challenges. One common issue that users face is being unable to assign certificates using Cert-Manager alongside the NGINX Ingress Controller. This issue often arises due to misconfigurations or incorrect implementations of the necessary resources. In this guide, we will explore the problem and provide a clear, step-by-step solution to get your certificates working correctly.

Understanding the Problem

In a recent scenario, a user faced difficulties with the status of their TLS certificates not reaching True, despite trying both DNS-01 and HTTP-01 challenge types. This resulted in the system being unable to configure SSL for their applications appropriately. The error output suggested that the CertificateRequest was stuck in an "In Progress" state, leading to confusion on the resolution.

Key Findings in the User's Configuration

Upon inspection, the following details were noted in the user's configuration files:

ClusterIssuer Configuration: They were using letsencrypt-staging with an HTTP-01 challenge.

Ingress Resource: The ingress configuration referenced a secret for the certificate but never achieved a ready state.

Certificate Resource: The status indicated it was continuously waiting for the corresponding CertificateRequest to complete.

Solution Overview

The user successfully resolved their certificate problem by leveraging the DNS-01 challenge instead of HTTP-01. This method often proves to be more reliable, especially in cloud environments where DNS can be directly manipulated.

Step-by-Step Solution

Here’s how you can configure your resources properly to issue a valid LetsEncrypt certificate using Cert-Manager and the NGINX Ingress Controller:

1. Create a ClusterIssuer

The first step is to define an Issuer that uses LetsEncrypt and DNS challenge. Here’s a sample ClusterIssuer configuration:

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

2. Define the Certificate Resource

Next, you need to create a certificate resource that references the issuer. This allows Cert-Manager to understand which issuer to use for the given domain:

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

3. Configure the Ingress Resource

Finally, you need to configure the Ingress to point to the newly created certificate and make sure your annotations are set correctly:

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

Conclusion

By transitioning from HTTP-01 to DNS-01 challenges and ensuring your configurations are correct, you should now be able to successfully assign certificates to your applications running on GKE using Cert-Manager and NGINX Ingress Controller. Remember, DNS-01 challenges are often more straightforward in cloud environments, thanks to the ability to automate DNS records.

If you continue to run into issues, reviewing logs, and ensuring that all necessary permissions for DNS access and service accounts are configured can be game-changers in resolving certificate assignments.

Feel free to reach out if you have further questions or need additional help with your Kubernetes setup!