EC2 Advanced

Question 1

What is User Data used for?

Answer 1

Bootstrapping EC2 instance to allow for build automation when first launching an instance.

Question 2

What is the size limit of User Data?

Answer 2

16 KB

Question 3

What can cfn-init help with?

Answer 3

Providing more flexible instance configuration. Better checking of correct configuration.

Question 4

What are EC2 Instance Roles used for?

Answer 4

Allow EC2 instances to interact with AWS services. More secure than adding access keys.

Question 5

What is SSM Parameter Store used for?

Answer 5

Storing parameters like database strings, config, passwords to access from EC2 instance. Think kind of like environment variables.

Question 6

What is the difference between a dedicated instance and a dedicated host?

Answer 6

With a dedicated instance, you still share hardware, so you can’t use server-bound licenses or meet regulatory requirements.

Question 7

Why might you want to use CloudWatch Agent?

Answer 7

To capture metrics on data about things running inside EC2 instances such as log data.

Question 8

Why would you want to use a cluster placement group?

Answer 8

Need best networking performance between instances

Question 9

Why would you want to use a spread placement group?

Answer 9

Have small number of critical instances that need to be kept separate

Question 10

Why would you want to use a partition placement group?

Answer 10

Contain impact of failure to part of an application

Question 11

How is instance used charge when using a dedicated host?

Answer 11

You don’t actually pay for instance usage since you pay for the hardware.