EC2 - Hibernate

Question 1

What is EC2 Hibernate?

Answer 1

The process for the in-memory (RAM) state to be preserved incase an instance is stopped.

Question 2

How is the RAM state preserved during EC2 Hibernate?

Answer 2

The RAM state is dumped into the root EBS volume when the instance is stopped and then it’s loaded onto the instance as if the instance hadn’t been stopped

Question 3

What are the three use cases for hibernation?

Answer 3

1. Long-running processing
2. Saving the RAM state
3. Services that take time to initialise (because the boot time is a lot faster)

Question 4

What are the two pros of using EC2 Hibernate?

Answer 4

1. The RAM state remains intact even when the instance is stopped.
2. The instance boot is much faster because the OS is not stopped/restarted.

Question 5

What are some requirements before you can use EC2 Hibernate?

Answer 5

1. The root volume must be EBS
2. EBS must be encrypted
3. EBS volume must be large enough to hold the RAM that is dumped onto it

Question 6

What Instance purchasing options can EC2 Hibernate be used on?

Answer 6

On-Demand
Reserved
Spot

Question 7

How long can instances be hibernated for?

Answer 7

They cannot be hibernated more than 60 days.