Engineer Deploys 4-Layer Security Stack on 29-Node RKE2 Cluster Before Any Workloads Run

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A platform engineer has documented the security hardening of a 29-node RKE2 Kubernetes cluster spanning three distributed Proxmox datacenters, deliberately installing protections before any tenant workloads are deployed. The setup integrates four cloud-native tools: Kyverno for admission control, KubeArmor for kernel-level syscall enforcement, Falco for behavioral anomaly detection, and Trivy Operator for continuous CVE and misconfiguration scanning. Each layer operates independently, ensuring no single point of failure across the defensive stack. The entire configuration is managed through a fully GitOps-driven workflow via ArgoCD, replacing all ad-hoc terminal commands with version-controlled commits. This work forms the third episode in a broader infrastructure series covering Terraform provisioning, HA RKE2 cluster setup, and now platform-wide security hardening.

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