Disaster Recovery Plans Examples

Standard Operating Procedure: Disaster Recovery (DR) Execution Framework

Document ID: TR-OPS-DR-001
Effective Date: 2023-10-27
Version: 2.1.0
Review Cadence: Semi-Annual (or post-incident)

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1. Executive Summary & Purpose

This SOP defines the institutional mandates for restoring mission-critical infrastructure at Template Registry following a catastrophic system failure. The purpose is to minimize Recovery Time Objectives (RTO) and Recovery Point Objectives (RPO) while maintaining data integrity and operational continuity.

2. Scope & Prerequisites

• Scope: Applies to all production environments, including cloud-native microservices, primary databases, and associated CI/CD pipelines.
• Prerequisites:
  • Active "Break-Glass" credentials for cloud infrastructure (IAM/AWS/GCP/Azure).
  • Offline verified backups (immutable storage).
  • Infrastructure-as-Code (Terraform/OpenTofu) repositories at version-locked states.
  • Incident Communication Portal (Statuspage/Slack emergency channels).

3. Roles & Responsibilities (RACI Matrix)

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4. Step-by-Step Procedure

Phase I: Triage & Escalation

• Declare incident status (Severity 1: Critical).
• Establish communication bridge (Bridge call/Slack war-room).
• Determine scope of data loss versus service unavailability.

Phase II: Environment Provisioning

• Trigger Terraform apply to baseline immutable infrastructure.
• Verify environment isolation (network security groups, VPC peering).
• Rotate all secrets via HashiCorp Vault or equivalent KMS.

Phase III: Data Restoration

• Initiate database restoration from the last "Known Good" snapshot.
• Validate checksums against pre-incident RPO metadata.
• Apply transaction logs (if applicable) to bring state to current T-minus-X.

Phase IV: Service Validation

• Execute automated smoke tests on core API endpoints.
• Review error rates and latency metrics via Prometheus/Grafana dashboards.
• Re-route global load balancers (DNS propagation) to new infrastructure.

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5. Quality Assurance & Pro-Tips

Metrics & Thresholds

• RTO Target: < 4 Hours.
• RPO Target: < 15 Minutes.
• Integrity Check: 100% parity required between restored DB and backup metadata.

Pro-Tips

• Immutable Backups: Ensure your backup bucket policies have "Object Lock" enabled to prevent ransomware encryption.
• The "Drift" Hazard: Always treat restored infrastructure as tainted; prioritize redeploying fresh code over patching existing instances.
• Automated Testing: Never manually verify a restored system. Use ephemeral CI test-runners to validate system state before switching traffic.

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6. Frequently Asked Questions

Q: How do we handle "split-brain" scenarios during regional failover?
A: Force a primary-secondary handshake via a designated "Source of Truth" coordinator. In extreme cases, disable writes to the secondary partition until synchronization is verified by the SRE lead.

Q: What is the procedure if the current backup snapshot is corrupted?
A: Pivot immediately to the "N-1" version snapshot. Do not attempt to repair corrupted blocks; the time cost exceeds the risk of secondary data loss.

Q: Who authorizes the "Cutover" to the recovered environment?
A: The Incident Commander (IC) must receive explicit clearance from both the SRE lead and the Chief Architect before modifying DNS/Load Balancer records.

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Julian Vance
Chief Architect, Template Registry