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- Now, let's review a demo

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of stopping and terminating EC2 instances.

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Now, from the EC2 dashboard
we can go to Instances

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and you'll see we have the Linux instance

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that we created earlier,

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we have a Windows instance
that we launched earlier

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and then I took the liberty of duplicating

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a Linux instance just so we
had something to terminate.

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So, if we were to look at
the actions that we can take,

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we can start an instance,
stop an instance,

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we can do stop, hibernate,

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we can reboot and we can terminate.

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So, in many cases rebooting may be,

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you know, a viable option.

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It may be appropriate for
that particular application

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in that particular scenario.

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And so, you can do that
right here from the console

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just simply cause that machine to reboot

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and perhaps, you know,

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there's an issue that could be resolved

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by simply rebooting the machine

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or perhaps you're doing something

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with a machine that
just requires rebooting

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like you know, maybe
installing something in Windows

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and you can do that.

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Otherwise, rebooting simply,

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like the machine doesn't go away

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and come back it's there

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but it's just like a machine on your desk,

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if you hit the reboot button

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or you go to your you know,
start menu or whatever

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and you just say reboot, that's
essentially what it's doing,

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the instance doesn't go anywhere.

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Now, in other cases, we
may decide you know what,

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we don't actually need
this machine anymore.

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So, we could just say terminate.

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If we were to terminate then it will say,

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are you sure you want to terminate.

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These will be gone, right.

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Any storage on any local
volumes will be gone,

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the EBS volume that's
attached will also be deleted.

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And of course this one says,

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it has termination protection
and will not be terminated.

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So, before I can terminate it,

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I have to go to Instance Settings,

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Change Termination Protection,

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and say Yes, Disable.

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Right, so, it's a safety mechanism,

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I'm going to go ahead now
that I've disabled that.

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Now, I can say Terminate.

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And it says this is an
EBS-backed instance,

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meaning that the root volume

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is backed by an EBS volume

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and that volume will also be deleted.

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Are you sure you wanna do that?

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Yes, let's go ahead and
terminate that instance.

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And so, then it goes into
a shutting down state

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and then it will go
into a terminated state.

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And so, that ID we will never see again

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because that instance
now that we've terminated

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it's completely gone and
it's a part of our history.

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You'll notice down here
that we have an instance

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that is currently in a stopped state.

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Which means that it's not actively running

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like the other two are
but it still exists.

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It hasn't been terminated
but it's not running either.

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And so, the volume if
you scroll down here,

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we should see that the
root volume still exists,

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we still have some type
of a EBS root volume

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that's still there.

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So, we're not paying the hourly fees

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for running this machine

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but we are paying the monthly storage fees

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for that EBS root volume.

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And so, there we go that
other one is now terminated

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and so it will remain
here in our console list

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for some time and we can also filter out

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if we wanted to filter by instance state,

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we could say you know what,

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I don't want to worry about

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those that are currently
terminated to stop,

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just show me the ones
that are running, right.

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And so, now we have this Linux instance

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and the Windows instance.

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So, let's go ahead and
stop our Linux machine.

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Now, before we do that,

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I just wanna point out the difference

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between Stop and Stop-Hibernate.

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Stop-Hibernate is currently not available

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simply because we need
to enable that ability

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when we launch the instance.

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If you don't enable that ability

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at the time you launch it
then it's just not available.

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Right.

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So, we did not opt into that at the time

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we launched the instance but
what that means is again,

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stopping it just means
that it still exists

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but we can get it back,
we can restart it, right.

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But Stop-Hibernate,

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the critical difference between Stop

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and Stop-Hibernate is that Hibernate

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maintains the contents of memory.

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So, when you stop it and
then restart it again,

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whatever was in RAM gets put back

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and so the machine can immediately pick up

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where it left off rather
than having to wait

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for you know, processes to start

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and pull information off of disk.

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So, let's go ahead and stop it

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and you'll notice here
it's saying that any data

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on the ephemeral storage will be lost.

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This instance doesn't really
have an ephemeral storage

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but if we did,

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if we had storage that
came with the instance,

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not an EBS volume but a volume

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that was an intrinsic part of the instance

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and any data on that would be
ephemeral and would be lost.

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So, I'll go ahead and stop that

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and then it goes into a stopping state

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and any time the state ends in i-n-g,

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like we're still paying for this instance.

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The second it is within
the stopping state,

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we're still paying for it.

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So, again, any instance
state that ends in i-n-g,

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we are paying for.

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So, as soon as it goes
into a stopped state

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or a terminated state

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then that's when we stop paying for it.

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Right, so, now it's stopped,

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if I go ahead and clear this filter,

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you'll see here that here's the instance

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that we just stopped and now

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I am no longer paying
for those hourly charges.

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I have a Windows machine
that is still running

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and I am paying those hourly charges.

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Alright, so, the great thing
about stopped instances

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is that they're already there.

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They're you know,

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you have applications are
installed and configured

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and they're much faster,

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generally much faster to become available

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than launching an instance from scratch.

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So, if I wanted to get this back

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and pick up where my
application and work left off,

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then all I would have to do
is say Instance State, Start.

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And say, yes start that instance.

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And then it goes into a pending state

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and now I start to pay
those hourly charges again.

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And it doesn't take very long at all

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for that instance to go
from pending to running.

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Usually, somewhere around you know,

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depending on the whether
it's Linux or Windows,

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some may take longer than others

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but there we go just in less than a minute

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it went from a stop state
to a running state, alright.

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And then like I said earlier

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if we determine that we
no longer needed these

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and we were never going to use them again,

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then of course I could go back here

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and go to Terminate but
these two particular machines

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we will continue to use
in future demos, right.

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So, that is how we can stop,
terminate, and start instances.