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Difficulty: HardBackup and Restore Management

A company is designing a disaster recovery (DR) architecture for a critical web application. The application's database runs on an Amazon RDS for MySQL DB instance, and its static backup archives are stored in an Amazon S3 bucket. The SysOps administrator must configure the infrastructure to meet the following requirements:

1. The database must automatically fail over to a standby instance in a different Availability Zone during an outage, achieving a Recovery Time Objective (RTO) of under 2 minutes.
2. The S3 backup archives must be automatically replicated to a secondary AWS Region to protect against regional disasters, achieving a Recovery Point Objective (RPO) of 15 minutes.

Which combination of actions must the SysOps administrator perform to meet these requirements? (Select TWO.)

  1. Enable Multi-AZ deployment on the Amazon RDS for MySQL DB instance.Answer
  2. Enable bucket versioning on both the source S3 bucket and the destination S3 bucket, then configure Amazon S3 Cross-Region Replication (CRR) to the secondary Region.Answer
  3. C
    Deploy an Amazon RDS Read Replica in a different Availability Zone and configure it as the automatic failover target using an Amazon Route 53 CNAME record.
  4. D
    Configure Amazon S3 Cross-Region Replication (CRR) on the source S3 bucket to replicate objects without enabling bucket versioning.
  5. E
    Configure Amazon Route 53 active-active failover routing to distribute database write operations between the primary RDS DB instance and the standby instance in the secondary Availability Zone.

Answer

To meet the requirements, the administrator must enable Multi-AZ deployment on the Amazon RDS for MySQL DB instance, and enable bucket versioning on both the source and destination S3 buckets before configuring S3 Cross-Region Replication (CRR).
The correct options are enabling Multi-AZ deployment on the RDS instance and enabling bucket versioning on both S3 buckets before configuring Cross-Region Replication. RDS Multi-AZ provides synchronous replication and automatic failover to a standby instance in another Availability Zone, typically completed within 60 to 120 seconds, satisfying the strict recovery time requirement. Amazon S3 Cross-Region Replication automatically replicates new objects to a bucket in a different Region, but requires versioning to be enabled on both the source and destination buckets to track object versions.

Step-by-Step Solution

1
Configure database high availability by modifying the Amazon RDS for MySQL DB instance.
Select the Multi-AZ deployment option to provision a synchronous standby DB instance in a different Availability Zone.
This ensures automatic failover and DNS redirection in the event of an infrastructure failure, meeting the RTO of under 2 minutes.
2
Prepare the source S3 bucket and a new destination S3 bucket in the secondary AWS Region.
Enable versioning on both S3 buckets.
Versioning is a strict requirement for S3 replication; replication cannot be enabled without it.
3
Establish S3 Cross-Region Replication (CRR) between the source and destination buckets.
Configure replication rules to copy all objects to the destination bucket in the secondary Region.
This satisfies the requirement to automatically replicate backup archives to another Region for disaster recovery.

Key Concept

Setting up high availability via RDS Multi-AZ and cross-region durability via S3 Cross-Region Replication, including prerequisite bucket versioning.
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Topics

Backup and Restore Management

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