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Phase 3B: Enterprise Compliance & Immutable Patching

📖 Deep-Dive Index

1. Security Frameworks & Continuous Compliance

  • The Standards: ISO 27001, SOC 2 Type II, CIS (Center for Internet Security) Foundations Benchmarks.
  • Continuous Monitoring: AWS Security Hub, AWS Config Conformance Packs, Azure Defender. Automating compliance evidence gathering instead of manual audits.
  • Drift Detection: Alerting when an administrator manually modifies a resource and pulls it out of ISO/CIS compliance.

2. Immutable Infrastructure (The "No-SSH" Patching Strategy)

  • The Paradigm Shift: In modern platforms, you never SSH into a server to run apt-get upgrade or use Ansible to patch live nodes. You replace them entirely.
  • Golden AMIs / Golden Images: Building pre-hardened, pre-patched OS images using HashiCorp Packer or EC2 Image Builder.
  • Vulnerability Remediation SLA: How to go from "Critical CVE announced" to "Entire 100-node fleet patched" within 24 hours.

3. Zero-Downtime Node Rotation

  • Rolling Upgrades: Safely evicting workloads from old unpatched nodes to new patched nodes.
  • Kubernetes Resilience: PodDisruptionBudgets (PDBs), Graceful Termination periods, Readiness Probes.
  • Karpenter AMI Drifting: Configuring Karpenter to automatically detect when a new Golden AMI is published and roll the fleet gracefully.

🛠️ Job-Essential Exercises

  1. The CIS Benchmark Audit:
  2. Enable AWS Security Hub and turn on the "CIS AWS Foundations Benchmark" standard. Review the dashboard to identify what resources in your account are failing ISO/CIS standards (e.g., root MFA missing, default VPCs in use).
  3. The Golden Image Pipeline:
  4. Write a HashiCorp Packer template. The pipeline should spin up an Ubuntu base image, run OS-level security patches (apt-get update && apt-get upgrade), install the AWS SSM agent, and output a private "Golden AMI" to your account.
  5. The Zero-Downtime Fleet Rotation:
  6. Deploy a sample application with a PodDisruptionBudget requiring minAvailable: 2.
  7. Update your Karpenter EC2NodeClass to use your newly minted Golden AMI.
  8. Trigger a node drift replacement and watch Kubernetes cordon, drain, and replace the underlying compute infrastructure without dropping a single HTTP request.