Exam AWS Certified Developer Associate topic 1 question 182 discussion

Exam question from Amazon's AWS Certified Developer Associate

Question #: 182
Topic #: 1

[All AWS Certified Developer Associate Questions]

A developer is creating a command line script to launch an Amazon EC2 instance at a preset time with a cron job. The developer will provide a user data script to start a task and then terminate the instance. The task cannot be interrupted and must run to completion.

How should the developer launch the EC2 instance?

A. Use the ec2 start-instances command.
B. Use the ec2 request-spot-instances command.
C. Use the ec2 run-instances command.
D. Use the ec2 purchase-scheduled-instances command.

Show Suggested Answer

Suggested Answer: C 🗳️

by kapil206001 at Nov. 24, 2022, 12:36 p.m.

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MMaquis

Highly Voted 2 years, 4 months ago

Selected Answer: C

The correct answer is C. Use the ec2 run-instances command. The ec2 run-instances command is used to launch a new EC2 instance. It allows you to specify the Amazon Machine Image (AMI) to use, instance type, security group, and user data script. In this case, the developer can specify the user data script that starts the task and terminates the instance after the task is completed. The ec2 start-instances command is used to start a stopped instance, not to launch a new one. The ec2 request-spot-instances command is used to request EC2 instances at a lower price than the on-demand price. This is not relevant to this scenario as there is no mention of needing to save costs. The ec2 purchase-scheduled-instances command is used to purchase EC2 instances that are scheduled to launch in the future. This is also not relevant to this scenario as the instance needs to be launched at a preset time with a cron job.

upvoted 6 times

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rcaliandro

Most Recent 2 years ago

Selected Answer: C

C is correct. The developer should create an AMI with the specified configurations and with the user data script inside, in order to have the possibility to launch that script as soon as we call the cli command to run instances. The rigth answer is C because to run instances we can use "aws ec2 run-instances --image-id XXXXXXXX --count Y" and so on.. with the parameters (for more info here the AWS guide: https://docs.aws.amazon.com/cli/latest/userguide/cli-services-ec2-instances.html)

upvoted 2 times

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