Disaster Recovery Guide¶

This guide provides comprehensive information on implementing a disaster recovery strategy for ZeroTrustKerberosLink to ensure business continuity in the event of a system failure or disaster.

Overview¶

A robust disaster recovery (DR) plan ensures that ZeroTrustKerberosLink can be quickly restored in the event of a system failure, data corruption, or site disaster. This guide covers key aspects of disaster recovery planning and implementation.

Disaster Recovery Strategy¶

Recovery Time Objective (RTO)¶

The Recovery Time Objective defines the maximum acceptable time to restore service after a disaster:

Tier 1 (Critical): < 1 hour
Tier 2 (Important): < 4 hours
Tier 3 (Standard): < 24 hours

Recovery Point Objective (RPO)¶

The Recovery Point Objective defines the maximum acceptable data loss:

Tier 1 (Critical): < 5 minutes
Tier 2 (Important): < 1 hour
Tier 3 (Standard): < 24 hours

Backup Strategy¶

Configuration Backup¶

ZeroTrustKerberosLink configuration should be backed up regularly:

backup:
  configuration:
    enabled: true
    schedule: "0 0 * * *"  # Daily at midnight
    retention: 30  # Days
    storage:
      type: "s3"
      bucket: "zerotrustkerberos-backups"
      prefix: "config/"
      region: "us-west-2"

Database Backup¶

Redis data should be backed up regularly:

backup:
  redis:
    enabled: true
    schedule: "0 */6 * * *"  # Every 6 hours
    retention: 14  # Days
    storage:
      type: "s3"
      bucket: "zerotrustkerberos-backups"
      prefix: "redis/"
      region: "us-west-2"

Backup Encryption¶

All backups should be encrypted:

backup:
  encryption:
    enabled: true
    algorithm: "AES-256-GCM"
    key_env: "BACKUP_ENCRYPTION_KEY"

Disaster Recovery Implementation¶

Active-Passive Configuration¶

In an active-passive configuration, a standby environment is maintained in a secondary location:

┌─────────────────────┐                  ┌─────────────────────┐
│                     │                  │                     │
│   Primary Region    │                  │  Secondary Region   │
│                     │                  │                     │
│  ┌───────────────┐  │  Configuration   │  ┌───────────────┐  │
│  │               │  │  Replication     │  │               │  │
│  │  ZeroTrust    │──┼─────────────────►│  │  ZeroTrust    │  │
│  │  Active       │  │                  │  │  Standby      │  │
│  │               │  │                  │  │               │  │
│  └───────┬───────┘  │                  │  └───────┬───────┘  │
│          │          │                  │          │          │
│  ┌───────┴───────┐  │     Data         │  ┌───────┴───────┐  │
│  │               │  │  Replication     │  │               │  │
│  │  Redis        │──┼─────────────────►│  │  Redis        │  │
│  │  Active       │  │                  │  │  Standby      │  │
│  │               │  │                  │  │               │  │
│  └───────────────┘  │                  │  └───────────────┘  │
│                     │                  │                     │
└─────────────────────┘                  └─────────────────────┘

Multi-Region Deployment¶

For critical deployments, implement a multi-region strategy:

disaster_recovery:
  multi_region:
    enabled: true
    primary_region: "us-west-2"
    secondary_regions:
      - region: "us-east-1"
        failover_priority: 1
      - region: "eu-west-1"
        failover_priority: 2
    health_check:
      interval: "1m"
      timeout: "10s"
      unhealthy_threshold: 3
    failover:
      automatic: true
      dns_failover: true

Data Replication¶

Configure data replication between regions:

disaster_recovery:
  data_replication:
    redis:
      mode: "async"  # sync, async
      frequency: "1m"
      validate: true

Disaster Recovery Testing¶

Regular testing of disaster recovery procedures is essential:

disaster_recovery:
  testing:
    schedule: "0 0 1 * *"  # Monthly
    notification:
      email: "dr-team@example.com"
      slack_webhook: "https://hooks.slack.com/services/xxx/yyy/zzz"

Test Scenarios¶

Configuration Restore Test: Verify that configuration can be restored from backup
Data Restore Test: Verify that Redis data can be restored from backup
Failover Test: Verify that failover to secondary region works correctly
Full DR Test: Simulate a complete disaster and verify recovery

Disaster Recovery Procedures¶

Manual Failover Procedure¶

Verify that the primary region is unavailable
Update DNS records to point to the secondary region
Promote the standby environment to active
Verify that the service is operational in the secondary region

# Manual failover command
zerotrustkerberos dr failover --region us-east-1

Recovery Procedure¶

Restore configuration from backup
Restore Redis data from backup
Verify system integrity
Perform health checks
Redirect traffic to the recovered system

# Restore from backup
zerotrustkerberos dr restore --config-backup s3://zerotrustkerberos-backups/config/20250501.zip --redis-backup s3://zerotrustkerberos-backups/redis/20250501.rdb

Security Considerations¶

When implementing disaster recovery, follow these best practices:

Encrypt Backups

Always encrypt backups to protect sensitive data.

Secure Replication

Use encrypted channels for data replication between regions.

Access Control

Implement strict access controls for disaster recovery procedures.

Test Regularly

Regularly test disaster recovery procedures to ensure they work when needed.

Document Procedures

Maintain detailed documentation for all disaster recovery procedures.