Can You Create Two Deployments Inside One Namespace in K8S? Here's How!

Описание: Discover how to create multiple deployments within a single Kubernetes namespace efficiently and effectively. Learn the simple steps and YAML configurations necessary to manage your applications seamlessly.
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Can You Create Two Deployments Inside One Namespace in K8S? Here's How!

Kubernetes (K8S) is an incredibly powerful and flexible platform for managing containerized applications, allowing developers to deploy, scale, and operate application containers across clusters of hosts. As a beginner, you might find yourself asking questions about how to structure your deployments effectively. One common question is: Is it possible to create two deployments inside one namespace? Let's dive into this important topic and explore the steps necessary to achieve it.

Understanding Namespaces in Kubernetes

What is a Namespace?

A namespace in Kubernetes is a logical partitioning of resources. It allows you to create multiple isolated environments within the same cluster, making it easier to manage applications that may have similar names or function in similar ways. For example, you might have:

dev for development environments

pre-prod for pre-production testing

prod for production deployments

Given that you want to add a second pre-production environment, referred to as pre-prod-2, it is indeed possible to create multiple deployments within a single namespace.

Creating Multiple Deployments in One Namespace

To create another independent deployment within the same namespace (in this case, pre-prod), you need to modify the existing Deployment YAML file you currently have. Here’s how to do it step by step:

Step 1: Adjust the Metadata

metadata.name: Change the name of your deployment to distinguish it from existing deployments. For instance, if your current deployment is named pre-prod, you could rename it to pre-prod-2.

Step 2: Update Labels

spec.selector.matchLabels.app: This label selector defines which pods belong to the deployment. To avoid conflicts with the existing deployment, update this label to be unique (e.g., app: pre-prod-2).

template.metadata.labels.app: Similar to the selector, update this template label. It should also match the new name you have assigned. Again, change it to app: pre-prod-2 for consistency.

YAML Configuration Example

Here is an example of how your updated YAML file might look after making these changes:

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

Step 3: Apply the Configuration

After modifying your YAML file, use the kubectl apply command to create your new deployment within the pre-prod namespace:

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

Conclusion

Creating multiple deployments within one namespace in Kubernetes is a straightforward process once you understand how namespaces and labels work. By altering the metadata.name, spec.selector.matchLabels.app, and template.metadata.labels.app, you can successfully add another deployment in your desired namespace, such as pre-prod-2.

Feel free to experiment with different configurations as you grow more familiar with Kubernetes. Happy deploying!