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Zorluk: OrtaDisaster Recovery Strategies

A company runs a critical web application in the us-east-1 Region. The application's stateful data is stored in an Amazon RDS for PostgreSQL DB instance. The SysOps administrator is designing a pilot light disaster recovery (DR) strategy in the us-west-2 Region. The business requires a Recovery Point Objective (RPO) of 15 minutes and a Recovery Time Objective (RTO) of 2 hours. Which combination of actions should the SysOps administrator perform to meet these requirements at the lowest cost? (Select TWO.)

  1. Create a cross-region read replica of the RDS for PostgreSQL DB instance in us-west-2 to achieve the required recovery point objective (RPO).Cevap
  2. Configure an Amazon Route 53 failover routing policy with a primary record pointing to us-east-1 and a secondary record pointing to us-west-2, and associate a Route 53 health check with the primary record.Cevap
  3. C
    Configure Route 53 to point to the cross-region read replica as a secondary endpoint, and rely on Amazon RDS to automatically promote the read replica to a primary database and redirect write traffic when Route 53 fails over.
  4. D
    Configure an Amazon Route 53 failover routing policy with a primary record pointing to us-east-1 and a secondary record pointing to us-west-2, without associating a health check, as Route 53 automatically fails over when the primary endpoint is unreachable.
  5. E
    Set up Amazon S3 Cross-Region Replication (CRR) to replicate application backup files from a source bucket in us-east-1 to a destination bucket in us-west-2 without enabling bucket versioning on either bucket.

Cevap

Create a cross-region read replica of the RDS for PostgreSQL DB instance in us-west-2, and configure an Amazon Route 53 failover routing policy with a primary record pointing to us-east-1 and a secondary record pointing to us-west-2, associating a Route 53 health check with the primary record.
The correct actions are to create an Amazon RDS cross-region read replica in the disaster recovery region and configure a Route 53 failover routing policy with a health check on the primary record. The cross-region read replica keeps the data synchronized asynchronously, ensuring the Recovery Point Objective (RPO) of 15 minutes is met. During failover, the replica is promoted to a primary database. Setting up Route 53 failover routing with a health check ensures that traffic is dynamically redirected to the secondary region when the primary region becomes unhealthy, supporting the 2-hour Recovery Time Objective (RTO).

Adım Adım Çözüm

1
Analyze the RPO and RTO requirements to determine the database replication mechanism.
The 15-minute RPO cannot be reliably met with daily snapshots. A cross-region read replica is required to provide near real-time asynchronous data replication to us-west-2.
Asynchronous cross-region replication ensures that data loss remains under 15 minutes during a disaster.
2
Determine the DNS routing mechanism for traffic failover.
Route 53 failover routing is chosen, pointing to us-east-1 as primary and us-west-2 as secondary.
This active-passive DNS configuration allows automated routing redirection when a regional failure occurs.
3
Configure the required Route 53 health check and associate it with the primary record.
A Route 53 health check is created to monitor the health of the us-east-1 endpoint and attached to the primary record.
Without an associated health check, Route 53 cannot detect a primary region outage and will not execute the failover routing policy.

Anahtar Kavram

Disaster Recovery strategies (specifically Pilot Light / Warm Standby database replication and Route 53 failover routing configuration).
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Disaster Recovery Strategies

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