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Discover how to efficiently create the same Kubernetes `Secret` in multiple namespaces using Helm. Follow our step-by-step guide!
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This video is based on the question https://stackoverflow.com/q/65007977/ asked by the user 'ratzip' ( https://stackoverflow.com/u/3057900/ ) and on the answer https://stackoverflow.com/a/65014492/ provided by the user 'Christian Daniel Avila Sanchez' ( https://stackoverflow.com/u/7277177/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Create the Same Secret in Multiple Namespaces Using Helm Charts

In the world of Kubernetes, managing configuration and sensitive data effectively is key to keeping your applications running smoothly. One common task involves storing secrets, such as user credentials, in different namespaces. If you're using Helm Charts, you may find yourself needing to create the same secret in multiple namespaces, such as test1, test2, test3, and so on. Today, we’ll walk you through how to specify different namespaces for the same secrets in your Helm Charts seamlessly.

Understanding the Problem

When deploying applications across multiple environments (like development, testing, and production), it’s crucial that sensitive information, like passwords, is stored correctly. However, Kubernetes mandates that secrets are stored in the context of a specific namespace. This means that if you have the same secret that needs to be deployed in multiple namespaces, you'll need to specify the namespace in your Helm Chart.

Let's take a look at an example secret definition in a secrets.yaml file in your Helm chart templates:

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In this basic example, the secret is created without specifying a namespace, which would default to the namespace defined during the Helm release. But how can we create this secret across multiple namespaces in a Helm-friendly way?

The Solution: Using a Loop in Helm Templates

To solve this problem, we will use a Helm template to dynamically create a Secret for each specified namespace. Here's how to do it:

Step 1: Define Your Namespaces

The first step is to define the list of namespaces in your values.yaml file. This file allows you to customize variables and settings that can be referenced within your templates. Here’s how you can set it up:

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

Step 2: Create a Template with a Loop

In your Helm chart, create a template for the secrets. You can use the {{- range .Values.namespaces }} directive to loop over the namespaces defined in your values.yaml. Here’s how the template for the secrets should look:

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

Explanation of the Template

{{- range .Values.namespaces }}: This starts a loop that iterates over each namespace listed in the values.yaml file.

Namespace Declaration: For each iteration, a new Secret is defined with the namespace specified by {{ . | quote }}. The quote function ensures that the namespace name is properly formatted and avoids any syntax errors.

Secret Data: The data under data: remains the same for each secret being created, ensuring that your sensitive information is consistent across all namespaces.

What Happens Next?

When you run your Helm deploy command, Helm processes this template file and generates a Secret YAML for each of the specified namespaces. For example, the output would look like this:

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

Each section represents the same secret created in different namespaces. This approach saves you from duplicating code and makes maintenance easier.

Conclusion

Creating the same Secret in multiple namespaces with Helm Charts is both simple and powerful. By leveraging Helm’s templating capabilities, you can dynamically generate resource definitions that suit your needs without redundancy. This not only keeps your charts clean but also ensures that managing secrets across different environments is more efficient, reducing the risk of configuration errors.

With the steps outlined above, you are now equipped to manage your Kubernetes secrets like a Pro. Happy deploying!