A company hosts its application in the AWS Cloud. The application runs on Amazon EC2 instances in an Auto Scaling group behind an Elastic Load Balancing (ELB) load balancer. The application connects to an Amazon DynamoDB table.
For disaster recovery (DR) purposes, the company wants to ensure that the application is available from another AWS Region with minimal downtime.
Which solution will meet these requirements with the LEAST downtime?
To meet the requirements of ensuring minimal downtime for disaster recovery, the solution should pre-provision the necessary infrastructure in the disaster recovery region. By creating an Auto Scaling group and an ELB in the DR Region and configuring the DynamoDB table as a global table, the infrastructure will be ready and only require DNS failover to point to the DR Region's ELB. This approach ensures that the infrastructure is already in place, thereby minimizing downtime during the failover process.
Create an Auto Scaling group and an ELB in the DR Region, configuring the DynamoDB table as a global table, and setting up DNS failover to the new ELB. This approach allows for quick failover since the infrastructure is already in place and only DNS needs to be updated to redirect traffic.
Downtime I would choose Auto scaling + DNS failover rather than use cloud formation create infrastructure in DR region or Auto scaling + Lambda
AnswerA Hence there is no information that solution need to be cost effective and the main requirement is minimal downtime i would go with AUTOSCALING in DR region with 1 ELB and 1 server there but in case of need amount of servers can be increased automatically. Hence at least 1 server and ELB will be waiting and DynamoDB thanks to global table will be active in the same DR region as well, hence we need to inform users, using DNS about new destination, hence DNS failover to the ELB in DR region is the best solution here.
Least downtime. C does not offer minimal downtime
Downtime I would choose Auto scaling + DNS failover rather than use cloud formation create infrastructure in DR region or Auto scaling + Lambda
With dynamo global tables, we just need to create an ELB and a ASG in the DR region resources. This resources will be used only if the main region fail over.
Option C