EC2 Hibernate
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Time
19 hours 19 minutes
Difficulty
Intermediate
CEU/CPE
20
Video Transcription
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>> Hey everybody and welcome back.
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In this lesson, we're going to be
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talking about EC2 hibernate.
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Learning objectives are going to be to
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describe the concept of
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hibernation and to discuss how hibernation works,
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which our options are for EC2.
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What is hibernation?
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Hibernation is a stasis similar to what
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we see with animals when they take a long rest.
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Bears, they go into hibernation in the winter,
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they eat up a bunch of nutrients, they rest,
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and when the winter is over, they wake up,
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they re-emerge out of their hibernation,
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and they go and they scavenge
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and they do their thing that bears do.
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In the technical world,
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hibernation is something that we do to put
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our machines down into a temporary stasis as well.
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It's not quite shutting it off.
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You're still retaining the memory, the data,
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and the exact position that it was
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in when I went into hibernation,
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and when you boot it backup from hibernation,
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it just picks up right where it left off from,
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so all the memory and all the data's still there.
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It's essentially going to sleep,
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but not quite as temporary as asleep.
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EC2 hibernation, here's some comparisons.
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When we stop an instance,
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the EBS volume is present
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until the instance is started again.
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When we're terminating an instance,
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the EBS volume gets destroyed with the EC2 instance.
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When you're hibernating it,
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the RAM is preserved,
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the state of the RAM in which it was written in,
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it's written to the EBS file.
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Reboot is faster from a stop state to a start state,
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and the EBS volume,
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it has to be encrypted in order to do this.
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That's basically the difference there.
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Everything stays persistent,
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it's just another way to put your EC2 to
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rest and pick it right back up from where you left off.
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A couple of things to note when
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you're hibernating your EC2 instances,
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you can only hibernate
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on-demand and reserve EC2 instances.
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When a EC2 instance is in hibernation,
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you're not being charged for that EC2 instance,
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this is technically just like
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an EC2 instance being put in a stopped state.
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Now, when the instance is going into
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hibernation or when it is going
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into that stopping state,
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it hasn't quite stopped yet,
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but when it's stopping, you're being charged.
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But once it has stopped or once it is hibernated,
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then you're no longer being charged anymore.
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Now, I will quickly note here
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that any data that is being
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stored on the EBS volumes that are still persistent,
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you're still being charged for that,
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but for the instance itself that is hibernated,
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you're not being charged for that.
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To quickly summarize real quick,
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EC2 offers hibernation as
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an additional way to stop your instances.
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Data state's persistent when you are hibernated.
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You're not being charged for the instance,
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you are being charged for the data that's on
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your EBS volumes that are attached.
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Just keep that in mind.
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Hibernation is just another way of stopping it.
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It's a lot quicker to boot
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back up from the stopping phase.
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If you were to compare stopping to hibernation,
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hibernation is going to boot back up
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quicker because all the data was just
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frozen and defrosted now it's up and running,
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so super easy to go.
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This is better than termination
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if you're looking to just temporarily shut it down.
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Termination is for when you're all done,
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you don't want the EBS volumes
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anymore, everything gets deleted.
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That wraps up this lecture.
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I'll see you all in the next one.
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