SANS Disaster Recovery Plan Template

Standard Operating Procedure: Disaster Recovery Plan (DRP) Architecture & Execution

1. Document Control Block

• Document ID: SOP-TR-DRP-042
• Effective Date: October 24, 2023
• Version: 3.2.0
• Classification: Restricted - Internal Operations / Infrastructure Engineering
• Review Cadence: Semi-Annual (Next Review: April 24, 2024)
• Owner: Chief Architect, Template Registry

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2. Executive Summary & Purpose

This Standard Operating Procedure (SOP) defines the institutional requirements, architectural patterns, and execution methodologies for developing, maintaining, and executing the Disaster Recovery Plan (DRP) at Template Registry.

The purpose of this document is to ensure business continuity, minimize catastrophic data loss, and enforce strict adherence to Recovery Time Objectives (RTO < 4 hours) and Recovery Point Objectives (RPO < 15 minutes) across all production template processing registries, infrastructure pipelines, and storage nodes.

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3. Scope & Prerequisites

3.1 Scope

• Applicability: All primary data centers, cloud regions (AWS us-east-1, us-west-2), hybrid storage arrays, and containerized orchestration layers managing Template Registry assets.
• Exclusions: Local developer environments and non-production sandbox instances (unless running isolated integration testing).

3.2 Prerequisites & Tooling

• Infrastructure Access: Root/Administrative access to AWS IAM, Terraform Enterprise, and Kubernetes cluster control planes.
• Secret Management: HashiCorp Vault access with designated break-glass administrative tokens.
• Communication Stack: PagerDuty enterprise bridge, dedicated war-room Slack channel (#incident-drp-warroom).
• Hardware/Software:
  • Terraform v1.5+
  • kubectl v1.27+
  • AWS CLI v2 configured with multi-factor authentication (MFA).
  • Immutable backup storage repositories (AWS S3 Object Lock enabled).

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4. Roles & Responsibilities (RACI Matrix)

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5. Step-by-Step Procedure

Phase 1: Disaster Identification & Triage

• 1.1 Detect system anomalies via automated Prometheus/Grafana alerts indicating primary region degradation or total outage.
• 1.2 Verify the incident severity level (Sev-1: Complete infrastructure failure; Sev-2: Partial data corruption/degradation).
• 1.3 Convene the Incident Response Team (IRT) within 5 minutes of alert propagation via PagerDuty bridge.
• 1.4 Formally declare a Disaster Recovery event, authorizing the execution of SOP-TR-DRP-042, and notify executive leadership.

Phase 2: Secondary Region Provisioning (Infrastructure Failover)

• 2.1 Authenticate into the secondary disaster recovery region (e.g., us-west-2) using administrative AWS CLI profiles.
• 2.2 Execute the disaster recovery Terraform execution script to provision core networking (VPCs, Subnets, Routing Tables):

  terraform init && terraform apply -target=module.core_infrastructure -auto-approve
  

• 2.3 Validate that Route53 DNS health checks are actively rerouting traffic away from the compromised primary region.
• 2.4 Spin up the immutable Kubernetes control plane using the latest validated GitOps state:

  argocd app sync template-registry-core --cascade=false
  

Phase 3: Data Restoration & Integrity Verification

• 3.1 Mount the latest immutable, point-in-time snapshot from the secure S3 Object Lock backup bucket.
• 3.2 Restore the primary PostgreSQL template database cluster to the secondary region:

  pg_restore --verbose --clean --no-acl --no-owner -h dr-db.internal -U postgres -d template_registry backup_latest.dump
  

• 3.3 Execute checksum validation scripts against restored template registry nodes to verify zero byte-level corruption:

  sha256sum -c /etc/templates/manifests/checksums.sha256
  

• 3.4 Confirm database transaction logs (WAL) are successfully replayed up to the targeted recovery point (RPO < 15 minutes).

Phase 4: System Validation & Traffic Cutover

• 4.1 Run synthetic integration and smoke test suites against the newly provisioned secondary endpoints:

  pytest --environment=dr --junitxml=dr-validation-report.xml
  

• 4.2 Manually adjust global DNS weighted routing policies in Route53 to direct 100% of production traffic to the secondary region.
• 4.3 Monitor real-time error rates, latency histograms, and CPU utilization metrics via the Datadog operations dashboard for 30 continuous minutes.

Phase 5: Post-Incident Reporting & Remediation

• 5.1 Issue an all-clear notification to internal stakeholders and external consumers via the Template Registry status page.
• 5.2 Secure and preserve all primary region system logs, core dumps, and audit trails for forensic root-cause analysis (RCA).
• 5.3 Schedule and conduct the mandatory Post-Mortem review within 48 hours of incident resolution with the SRE and architectural teams.

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6. Quality Assurance & Pro-Tips

6.1 Best Practices

• Immutable Backups: Always ensure backup buckets utilize write-once-read-many (WORM) policies to prevent malicious or accidental administrative deletion during an active ransomware/infrastructure attack event.
• Infrastructure as Code (IaC): Never perform manual resource provisioning during a disaster recovery scenario. Rely strictly on version-controlled Terraform modules to maintain architectural parity.

6.2 Common Pitfalls

• Stale DNS TTLs: Failing to lower TTLs on critical entry points prior to an event can significantly delay traffic propagation during routing failovers.
• Missing Secrets: Forgetting to sync dynamic secrets vaults (HashiCorp Vault) to the secondary region will cause immediate application crash-loops upon container startup.

6.3 Metric Thresholds

• RTO (Recovery Time Objective): $\le$ 240 Minutes (Target: 120 Minutes).
• RPO (Recovery Point Objective): $\le$ 15 Minutes (Target: 5 Minutes).
• Data Integrity Verification Rate: 100% checksum match on all restored template repositories.

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7. Frequently Asked Questions (FAQ)

Q1: What is the protocol if the automated DNS failover fails to route traffic to the secondary region within 15 minutes?

A: The DevOps Incident Commander must bypass automation and manually execute the emergency AWS Route53 weight override script (scripts/emergency-dns-override.sh). Simultaneously, open an emergency support ticket with AWS Enterprise Support for global edge routing assistance.

Q2: How are encryption keys managed across regions during a complete cloud provider regional failure?

A: Template Registry utilizes multi-region AWS KMS keys replicated via automated cross-account policies. In the event of a regional failure, the secondary region automatically assumes control of the replica keys without manual cryptographic intervention, provided the break-glass policy parameters are validated.

Q3: Can disaster recovery drills be executed in a live production environment?

A: No. Live production failover drills are strictly prohibited during core operational hours. All scheduled simulations must be executed in designated staging environments or via isolated, non-disruptive regional failover dry-runs validated by the Chief Architect.