The first step towards building fault-tolerant applications on aws is to create a
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Failure is inevitable for hard disks, networks, power, and so on. Fault-tolerance deals with that problem. A fault-tolerant system is built for failure. If a failure occurs, the system isn’t interrupted, and it continues to handle requests. If your system has a single point of failure, it’s not fault-tolerant. You can achieve fault-tolerance by introducing redundancy into your system and by decoupling the parts of your system in such a way that one side doesn’t rely on the uptime of the other. The most convenient way to make your system fault-tolerant is to compose the system of fault-tolerant blocks. If all blocks are fault-tolerant, the system is fault-tolerant as well. Many AWS services are fault-tolerant by default. If possible, use them. Otherwise you’ll need to deal with the consequences. Unfortunately, one important service isn’t fault-tolerant by default: EC2 instances. A virtual server isn’t fault-tolerant. This means a system that uses EC2 isn’t fault-tolerant by default. But AWS provides the building blocks to deal with that issue. The solution consists of auto-scaling groups, Elastic Load Balancing (ELB), and SQS. It’s important to differentiate among services that guarantee the following: 13.1. Using redundant EC2 instances to increase availability
13.2. Considerations for making your code fault-tolerant13.3. Architecting a fault-tolerant web application: Imagery13.4. SummarySkip to content NOTE: Topic mainly for Professional Exam OnlyRegions & Availability Zones
Amazon Machine Image – AMIs
Auto Scaling
Elastic Load Balancing – ELB
Elastic IPs – EIPs
Reserved Instance
Elastic Block Store – EBS
EBS Snapshots
Relational Database Service – RDS
Simple Storage Service – S3
Simple Queue Service – SQS
Route 53
CloudFront
AWS Certification Exam Practice Questions
References
Which service is used introduce fault tolerance into an application architecture AWS?Amazon EC2 is a natural entry point to AWS for your application development. You can build a highly reliable and fault-tolerant system using multiple EC2 instances and ancillary services such as Auto Scaling and Elastic Load Balancing.
Which AWS services provide fault tolerance?Fault tolerance. Amazon Aurora DB Instance Accessibility.. Amazon Comprehend Endpoint Access Risk.. Amazon EBS Snapshots.. Amazon EC2 Availability Zone Balance.. Amazon RDS Backups.. Amazon RDS Multi-AZ.. AWS Resilience Hub policy breached.. AWS Resilience Hub resilience scores.. What option below will increase the fault tolerance of your application in AWS?If you have a preexisting load balancer, you can create an Auto Scaling group to automatically terminate unhealthy instances and launch new, healthy ones. In addition to improving the fault tolerance of your application, you can configure Auto Scaling to dynamically scale up your application in response to demand.
Which of the following is a method for building a highly available application on AWS?AWS has several methods for achieving HA through both approaches, such as through a scalable, load balanced cluster or assuming an active–standby pair.
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