Karpenter, an open-source high-performance Kubernetes cluster autoscaler, is used to deliver namespace-as-a-service multi-tenancy for Amazon EKS by provisioning node pools with taints, tolerations, and labels based on namespaces, ensuring tenant isolation and resource sharing.

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<p>This article explains how to achieve multi-tenancy and namespace isolation for Amazon EKS clusters using Karpenter and Open Policy Agent (OPA) Gatekeeper.</p>
<p>Specifically, the article covers:</p>
<ul>
<li>Prerequisites for setting up the environment (EKS cluster, tools, Karpenter, OPA Gatekeeper)</li>
<li>Creating separate namespaces for different tenants (tenant-a and tenant-b)</li>
<li>Configuring network policies to isolate traffic between namespaces</li>
<li>Setting up Karpenter node templates and provisioners for separate node pools (pool-a and pool-b)</li>
<li>Deploying OPA Gatekeeper policies to assign node selectors and tolerations based on namespace</li>
<li>Testing the setup by deploying sample applications in each namespace</li>
<li>Cleanup steps to remove the resources created</li>
</ul>
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