A company is designing a highly resilient architecture for a critical application. They want to ensure that if an entire AWS Region goes down, they can recover the application in a secondary region. The application uses Amazon EC2 instances, an Application Load Balancer, and Amazon RDS for MySQL. They have chosen a 'Warm Standby' strategy. Which actions are required to implement this strategy? (Select THREE)

Answer options:

Deploy a scaled-down version of the EC2 instances and ALB in the secondary region.

Configure an Amazon RDS cross-region read replica in the secondary region.

Use Amazon Route 53 to route a small percentage of traffic to the secondary region to ensure it is functioning.

Keep the EC2 instances in the secondary region stopped until a disaster occurs.

Take daily snapshots of the RDS database and copy them to the secondary region.

Deploy the exact same number of EC2 instances in the secondary region as in the primary region.

How to approach this question

Define the 'Warm Standby' DR pattern: scaled-down but running compute, continuous data replication, and active routing.

Full Answer

Deploy a scaled-down version of the EC2 instances and ALB in the secondary region., Configure an Amazon RDS cross-region read replica in the secondary region., Use Amazon Route 53 to route a small percentage of traffic to the secondary region to ensure it is functioning.

The 'Warm Standby' disaster recovery strategy involves ensuring that a scaled-down, but fully functional, copy of your production environment is always running in the DR region. This means deploying a smaller Auto Scaling group of EC2 instances and an ALB. Data is continuously replicated using an RDS cross-region read replica. Because the environment is running, you can use Route 53 weighted routing to send a small amount of traffic (e.g., 5%) to the DR region to continuously verify its health.

Common mistakes

Confusing Warm Standby with Pilot Light (where compute is off) or Active-Active (where compute is at 100% capacity).

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