Achieve fault tolerance and minimal downtime for your AWS applications with Amazon Aurora Global Database, multi-region deployment, Route 53 health checks, and failover routing policy. Learn how to ensure high availability and disaster recovery.
Table of Contents
Question
A company has a regional subscription-based streaming service that runs in a single AWS Region. The architecture consists of web servers and application servers on Amazon EC2 instances. The EC2 instances are in Auto Scaling groups behind Elastic Load Balancers. The architecture includes an Amazon Aurora global database cluster that extends across multiple Availability Zones.
The company wants to expand globally and to ensure that its application has minimal downtime.
Which solution will provide the MOST fault tolerance?
A. Extend the Auto Scaling groups for the web tier and the application tier to deploy instances in Availability Zones in a second Region. Use an Aurora global database to deploy the database in the primary Region and the second Region. Use Amazon Route 53 health checks with a failover routing policy to the second Region.
B. Deploy the web tier and the application tier to a second Region. Add an Aurora PostgreSQL cross-Region Aurora Replica in the second Region. Use Amazon Route 53 health checks with a failover routing policy to the second Region. Promote the secondary to primary as needed.
C. Deploy the web tier and the application tier to a second Region. Create an Aurora PostgreSQL database in the second Region. Use AWS Database Migration Service (AWS DMS) to replicate the primary database to the second Region. Use Amazon Route 53 health checks with a failover routing policy to the second Region.
D. Deploy the web tier and the application tier to a second Region. Use an Amazon Aurora global database to deploy the database in the primary Region and the second Region. Use Amazon Route 53 health checks with a failover routing policy to the second Region. Promote the secondary to primary as needed.
Answer
D. Deploy the web tier and the application tier to a second Region. Use an Amazon Aurora global database to deploy the database in the primary Region and the second Region. Use Amazon Route 53 health checks with a failover routing policy to the second Region. Promote the secondary to primary as needed.
Explanation
The most fault-tolerant solution is Option D: Deploy the web tier and the application tier to a second Region. Use an Amazon Aurora global database to deploy the database in the primary Region and the second Region. Use Amazon Route 53 health checks with a failover routing policy to the second Region. Promote the secondary to primary as needed.
Here’s a detailed explanation:
- Deploy web and application tiers across two regions: By deploying the web and application tiers in a second AWS Region, the company achieves high availability and fault tolerance. If one Region experiences an outage or disruption, traffic can be automatically routed to the other Region, minimizing downtime.
- Amazon Aurora Global Database: Aurora Global Database provides a globally distributed, highly available database spanning multiple AWS Regions. The data is replicated across Regions with low latency, enabling fast failover and recovery in case of a regional outage.
- Route 53 Health Checks and Failover Routing Policy: Using Amazon Route 53 health checks and a failover routing policy, the company can monitor the health of its application across both Regions. If the primary Region experiences issues, Route 53 can automatically route traffic to the secondary Region, ensuring minimal downtime.
- Promote Secondary to Primary: In case of a regional outage, the secondary Aurora Global Database instance can be promoted to the primary role, allowing the application to continue operating seamlessly in the secondary Region.
This solution addresses the company’s requirements for global expansion and minimal downtime, providing fault tolerance, high availability, and disaster recovery capabilities across multiple AWS Regions.
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