Using an Amazon Linux AMI, you have created an m5.large EC2 instance for one of your research programs. Due to a limited budget, you prefer to put the instance into a stopped state when it is not used. Another requirement is that when you start the instance, the instance does not need to reboot, and you can continue from where it left off. You want to hibernate the EC2 instance to make this happen. Which description is correct to implement this hibernation option?

Answer options:

A.You cannot enable hibernation on an existing instance. You have to relaunch a new instance from an instance store volume to support the hibernation option.
B.You can use the AWS console to select the existing instance and choose Actions -> Instance State -> Stop - Hibernate.
C.You cannot enable hibernation on an existing instance. You have to launch a new instance with an HVM AMI. Enable the hibernation feature on the Configure Instance Details page.
D.You can only use AWS CLI to enable the hibernation option via “aws ec2 hibernate-instances --instance-ids i-1234567890abcdef0”. AWS Console is not supported for the hibernation option.

Correct Answer – C
 
For the hibernation feature, one limitation is that you cannot enable hibernation on an existing instance (running or stopped). For details, please refer to https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Hibernate.html.
Option A is incorrect: Because instance store-backed instances cannot be hibernated.
Option B is incorrect: Because a new instance has to be launched to enable hibernation function as below.
Option C is CORRECT: This is the suggested way in https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Hibernate.html.
Option D is incorrect: Same reason as Option
B. One more thing is that the CLI command is something like “aws ec2 stop-instances --instance-ids i-1234567890abcdef0 --hibernate”. Also, AWS Console is supported for the hibernation option.