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Cluster Separation

Overview​

Cluster separation in GitOps involves hosting the GitOps control plane on a distinct Kubernetes cluster, separate from the application clusters. By isolating the GitOps tool (e.g., ArgoCD, FluxCD) from the clusters where applications run, you create a security boundary that limits the risk of an attacker gaining control over the GitOps pipeline if they compromise an application cluster.

Why It’s Important​

  1. Security Isolation: A compromised application cluster won’t grant direct access to the GitOps tool, reducing the potential impact of the breach.
  2. Enhanced Control: A dedicated GitOps cluster allows for stricter access control and better monitoring of the deployment process.
  3. Reduced Attack Surface: Keeping the GitOps cluster more secure and isolated from publicly exposed application clusters reduces its vulnerability to network-based attacks.

Implementation Steps​

  1. Set Up a Dedicated GitOps Cluster: Deploy your GitOps tool in a separate Kubernetes cluster, isolated from production and staging clusters.
  2. Enforce Network Isolation: Use network policies to prevent the application clusters from directly communicating with the GitOps cluster, allowing access only for necessary pull and deployment operations.
  3. Monitor for Anomalies: Set up logging and monitoring specifically for the GitOps cluster to alert on any suspicious activities.