A company runs a stateful production application on Amazon EC2 instances. The application requires at least two EC2 instances to always be running. A solutions architect needs to design a highly available and fault-tolerant architecture for the application. The solutions architect creates an Auto Scaling group of EC2 instances. Which set of additional steps should the solutions architect take to meet these requirements?
Select an option, then click Submit answer.
Reference / correct answer:
Set the Auto Scaling group's minimum capacity to four. Deploy two On-Demand Instances in one Availability Zone and two On-Demand Instances in a second Availability Zone.
Most accepted answer: B. Set the Auto Scaling group's minimum capacity to four. Deploy two On-Demand Instances in one Availability Zone and two On-Demand Instances in a second Availability Zone.
Community votes: A=2, B=12
Selected Answer: B By setting the Auto Scaling group's minimum capacity to four, the architect ensures that there are always at least two running instances. Deploying two On-Demand Instances in each of two Availability Zones ensures that the application is highly available and fault-tolerant. If one Availability Zone becomes unavailable, the application can still run in the other Availability Zone. upvoted 19 times
Selected Answer: A My rational is: Highly available = 2 AZ, and then 2 EC2 instances always running is 1 EC2 in each AZ. If an entire AZ fails, SacalinGroup deploy the minimun instances (2) on the running AZ upvoted 15 times baba365 2 years, 10 months ago Ans: A. The application requires at least two EC2 instances to always be running = 2 minimum capacity… minimum cap of 4 ec2 will work but a waste of resources that doesn’t follow well archi. framework. upvoted 2 times Ramdi1 2 years, 10 months ago it says always have to have two running, hence you need 4. two in each AV. it might be a waste of resource but if that what is required by the company then so be it. Also you out the 4 you cannot use spot instances because if the two instances on the on demand go down and you need to use the spot instance they could be called back at any point. upvoted 5 times Ramdi1 2 years, 10 months ago AZ * not AV upvoted 3 times ... ... ...
Ans: A. The application requires at least two EC2 instances to always be running = 2 minimum capacity… minimum cap of 4 ec2 will work but a waste of resources that doesn’t follow well archi. framework. upvoted 2 times Ramdi1 2 years, 10 months ago it says always have to have two running, hence you need 4. two in each AV. it might be a waste of resource but if that what is required by the company then so be it. Also you out the 4 you cannot use spot instances because if the two instances on the on demand go down and you need to use the spot instance they could be called back at any point. upvoted 5 times Ramdi1 2 years, 10 months ago AZ * not AV upvoted 3 times ... ...
it says always have to have two running, hence you need 4. two in each AV. it might be a waste of resource but if that what is required by the company then so be it. Also you out the 4 you cannot use spot instances because if the two instances on the on demand go down and you need to use the spot instance they could be called back at any point. upvoted 5 times Ramdi1 2 years, 10 months ago AZ * not AV upvoted 3 times ...
AZ * not AV upvoted 3 times