Ensure Continuous Application Functionality on AWS with High Availability
Question
You are planning to serve a web application on the AWS Platform by using EC2 Instances.
Which of the below principles would you adopt to ensure that even if some of the EC2 Instances crash, you still have a working application?
Answers
Explanations
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A. B. C. D.Answer - D.
A fault-tolerant system is one that ensures that the entire system works as expected, even there are issues.
For more information on designing fault-tolerant applications in AWS, please refer to the below URL:
https://d1.awsstatic.com/whitepapers/aws-building-fault-tolerant-applications.pdf?did=wp_card&trk=wp_card https://aws.amazon.com/premiumsupport/knowledge-center/autoscaling-fault-tolerance-load-balancer/ https://aws.amazon.com/whitepapers/?whitepapers-main.sort-by=item.additionalFields.sortDate&whitepapers-main.sort-order=descTo ensure that the web application remains functional even if some of the EC2 Instances crash, you should use a fault-tolerant system.
Fault tolerance is a characteristic of a system that enables it to continue operating even if some of its components fail. A fault-tolerant system has redundant components, and if one component fails, another takes over its function without interrupting the system's operation.
In the case of EC2 Instances, a fault-tolerant system could involve the use of an Auto Scaling group with multiple instances distributed across different Availability Zones. Auto Scaling can automatically launch additional instances when the demand for the web application increases, and it can also replace instances that fail. Distributing instances across multiple Availability Zones ensures that if one Availability Zone becomes unavailable, the web application can continue running in another Availability Zone.
Using a scalable or elastic system could help ensure that the web application can handle increases in traffic and workload, but it does not guarantee fault tolerance.
Using a regional system may involve replicating the application and the data across multiple regions. While this can help with disaster recovery and business continuity, it may not provide fault tolerance within a single region.
In summary, to ensure that the web application remains operational even if some of the EC2 Instances fail, you should use a fault-tolerant system that includes redundant instances distributed across multiple Availability Zones.
