💡 Originally published on devtocash.com — where this guide stays updated. I write hands-on DevOps/SRE deep-dives there weekly.
A single misconfigured Kubernetes cluster can expose your entire infrastructure in minutes. In 2025, over 60% of organizations reported at least one Kubernetes security incident — and the majority traced back to misconfigured RBAC, overly permissive pod security contexts, or unpatched container images running as root.
The hardening playbook starts with four layers: RBAC (least-privilege service accounts, no cluster-admin for workloads), Network Policies (default-deny ingress/egress, namespace isolation), Pod Security (readOnlyRootFilesystem, runAsNonRoot, seccomp profiles), and Supply Chain (image signing with Cosign, vulnerability scanning in CI). Each layer alone stops a class of attacks — combined, they force an attacker to defeat multiple defenses before reaching production data.
Runtime security is the final frontier: Falco for syscall monitoring, OPA/Gatekeeper for admission control, and continuous compliance scanning against CIS benchmarks. The article includes production-ready YAML for every layer — copy, adapt, and apply.
The complete hardening guide — from RBAC to runtime security — is waiting for you with production-ready YAML you can copy, adapt, and apply to your cluster today. Get it at devtocash.com
Originally published at devtocash.com
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