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Greg Hendrickson 58e8140f36 feat(security): add Pod Security Standards (PSA) namespace configurations

- Add namespace templates for privileged, baseline, and restricted levels
- Include compliant deployment examples for baseline and restricted
- Add migration audit script for checking namespace compliance
- Document PSA levels, enforcement modes, and migration strategy

Follows Kubernetes Pod Security Admission best practices for 2025+.
Reference: https://kubernetes.io/docs/concepts/security/pod-security-standards/

2026-02-06 18:02:09 +00:00

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Pod Security Standards (PSS) Configuration

Kubernetes Pod Security Admission (PSA) enforces the Pod Security Standards at the namespace level.

Security Levels

Level	Description	Use Case
Privileged	Unrestricted, allows all capabilities	System workloads, CNI, monitoring agents
Baseline	Prevents known privilege escalations	Most application workloads
Restricted	Hardened, follows best practices	Sensitive/untrusted workloads

Enforcement Modes

enforce - Rejects pods that violate the policy
audit - Logs violations but allows pods
warn - Sends warnings to users but allows pods

Quick Start

# Apply all namespace configurations
kubectl apply -f namespaces/

# Test a deployment against restricted namespace
kubectl apply -f examples/restricted-deployment.yaml -n restricted-apps

Namespace Configuration

Each namespace is configured with PSA labels:

labels:
  pod-security.kubernetes.io/enforce: restricted
  pod-security.kubernetes.io/enforce-version: latest
  pod-security.kubernetes.io/audit: restricted
  pod-security.kubernetes.io/warn: restricted

Migration Strategy

Start with audit and warn modes to identify violations
Fix non-compliant workloads
Enable enforce mode

Files

namespaces/ - Pre-configured namespaces for each security level
examples/ - Compliant deployment examples for each level
migration/ - Tools for auditing existing namespaces

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