disaster-recovery

1# Disaster Recovery
2 
3Implement disaster recovery strategies including RTO/RPO planning, AWS cross-region failover patterns, DR testing procedures, and automated failover scripts.
4 
5## When to Use
6 
7- Defining RTO and RPO targets for critical systems
8- Designing multi-region or multi-cloud disaster recovery architectures
9- Implementing automated failover and failback procedures
10- Conducting DR tests (tabletop, component, full failover)
11- Meeting compliance requirements for contingency planning (SOC 2, HIPAA, FedRAMP, ISO 27001)
12 
13## RTO/RPO Planning
14 
15```yaml
16recovery_metrics:
17  RTO:
18    definition: "Recovery Time Objective - maximum acceptable downtime"
19    measurement: "From incident declaration to service restoration"
20    factors:
21      - Failover automation maturity
22      - Data replication lag
23      - DNS propagation time
24      - Application warm-up time
25      - Verification procedures
26 
27  RPO:
28    definition: "Recovery Point Objective - maximum acceptable data loss"
29    measurement: "Time gap between last good backup and the incident"
30    factors:
31      - Backup frequency
32      - Replication method (sync vs. async)
33      - Transaction log shipping interval
34      - Cross-region replication lag
35 
36service_tier_targets:
37  tier_1_critical:
38    examples: "Authentication, payment processing, core API"
39    rto: "< 15 minutes"
40    rpo: "< 1 minute (near-zero)"
41    strategy: "Multi-site active-active or warm standby"
42    replication: "Synchronous or near-synchronous"
43…