We have 2 reserved c3.xlarge instance in our project but have total 3 launched c3.xlarge instance.
How to check which 2 instances are reserved out of 3. I checked details of all 3 instances, but nothing is mentioned.
Reserved or not reserved is just a billing convenience. There is no concept of a particular instance being reserved or not.
So for example if you have two instances and have purchased on reserved instance and one is 'on demand', you can delete either one of them, and one of them is still reserved.
To check your reserved instances:
login to your aws console.
Go to EC2 management page.
Expand Instances
Click on Reserved Instances
Here you can see all your available reserved instances if available, else "You do not have any Reserved Instances." is displayed.
Related
I am currently running an instance on a reserved instance.
That instance now I dont want to use but I want to still not lose that instance. Just shutdown.
How can I move the reserved instance that I paid long term to a newly created instance ?
Thanks.
From docs:
Reserved Instances are not physical instances, but rather a billing discount that is applied to the running On-Demand Instances in your account. The On-Demand Instances must match certain specifications of the Reserved Instances in order to benefit from the billing discount.
So you can terminate your current instance and if the new one match with your reserve (instance type, region, etc) then the reserve is applied automatically.
I have reservation of type t2.micro and us-ease-1d availability zone, also I have multiple instances running, including the one with mentioned type and zone.
As a result I expect billing for this one instance will take into account the reservation. The problem is that I haven't found any link between reservation and actual instances.
I've used aws ec2 describe-instances and aws ec2 describe-reserved-instances CLI commands but I wasn't able to find any link.
Is it possible to realise which billing approach will be used for each instance using Amazon SDK?
So f.e. I will see that some instance is linked to some reserved instance (reservation)
Is it possible to realise which billing approach will be used for each instance using Amazon SDK?
No, it isn't.
The "link" between reserved instances and running instances is not something the EC2 operational infrastructure knows about. It's all done after the fact, in billing.
Each hour, for a given instance type and availability zone placement, you're billed for your reserved instances (depending on the terms of the reservation, this happens whether you have this many instances running or not, though in some cases, the amount billed here is $0 since you've already paid). Then, if the number of running on-demand instances for that type and placement exceeds exceeds the number of reserved instances for that type and placement, the difference for that hour is billed at the on-demand rate.
So if you had purchased one reserved instance matching a certain spec and during a given hour you had two such instances running, it's not really the case that one of your instances "is the reserved instance" and the other one isn't. If you stop either one, then the next hour, the reserved instance pricing applies to the one that remains running... but EC2 can't tell you which is which and, in fact, the billing logic is such that it doesn't matter.
There isn't really a link between reservations and specific instances. Think of it more like a discount that gets applied to your bill, after you have incurred some instance charges.
You can use the Reserved Instance Utilization Report to see how your reservations have been applied to the instance hours you have been charged for.
I have right now AWS free tier instance. I purchased a m3.large reserved instance. Now how can i run and use this as i was using free tier instance .
I cant see any start/stop option for reserved instance.
Reserved instances are purely an accounting/billing thing. There is not a special way to "run" a reserved instance. Simply run an instance that matches the specifications of your reserved instance purchase and it will run at the reserved instance rate rather than the on-demand rate.
Basically AWS billing sees that you're running an instance for the hour. They check to see if there is a reserved instance purchased that matches the specifications of the running instance. If one is found, that hour is billed at the reserved rate. If one is not found, then you're charged at the on-demand rate.
We’ve purchased an Amazon Web Services (AWS) reserved instance for an Amazon Elastic Compute Cloud (EC2) instance that is critical to our infrastructure. This instance starts and stops every day at certain time interval.
I see that purchasing a reserved instance 'guarantees' that this instance will reliably start even when AWS is under heavy load, but is there any way to specifically tie this reserved instance to the instance we want to associate with it?
What happens if we add another instance that matches the exact criteria of the reserved instance we’ve purchased?
You don't need to worry or do anything in associating the instance and the purchased Reserved Instance; all those are done automatically by AWS.
The reserved Instance is purely a billing and cost related and it doesn't relate to the technology aspect of an EC2 instance. If any of your running instance matches with any of your purchased Reserved Instance then you benefit from the reduced costing. There isn't any commitment on the SLA or changes at the Instance level which involves Reserved Instance. The same case works when you have 2 reserved instances; if there 2 instances running in your account which matches your reserved instance purchase they the reduced cost would be applied.
Analogy - Super Market Coupon Offer
If the Offer Says, buy 2 units of Product A and get one Product B
absolutely Free. So you look into the offer and take 2 units of
Product A and one Unit of Product B. During the billing as well, the
Point of Sales Person also doesn't look into each and every product
and try to check it offers; rather he or she directly keeps scaning
each and every product against the bar-code scanner and that't it -
when these 3 are scanned, the price for Free-Product is automatically
reversed.
So similarly, you buy the Reserved Instance (Coupon) choosing the AMI,
Region, AZ, Duration etc. You would do all your tech stuff as usual
like deploying, patching, monitoring etc. During the billing, if the
instance(s) you launched matches the Reserved Instance, then the
Reserved pricing would be applied; if not that would be charged at
'On-Demand-Pricing'.
If there is a mismatch between what instance you are running and what instance you have reserved; you will not be using the benefit of Reserved-Instance pricing
and be charged with On-Demand-Pricing. Also you will be wasting the
investment done for the Reserved-Instance
As implied in Naveen's answer, there is no direct way to associate an instance with a reservation.
If you want the reliability, then you must launch instances with unique set of properties (instance type, az and AMI). There is no other way at the moment.
This is supposed to be a comment in Naveen's reply. But as I had no reputation yet to commen, I am adding it as an answer.
Can AWS Reserved Instances be used in OpsWorks?
If so, how? Any documentation would be great.
Thanks.
Yes, because a reserved instance is just a billing mechanism, not a specific machine - when you buy a reserved instance you are just agreeing ahead of time to pay a certain amount for a certain type of machine (whether you use it or not).
If you already have a reserved instance 'under contract' and have not yet spun it up, if you use Opsworks to spin it up, you will be charge your reserved price while that instance is running.
If you have 3 reserved instances, and you spin up 4 in Opsworks, you will be charge 3 instances at the reserved price, and one at the on demand price.
If you buy 5 reserved instances and only spin up 2 in Opsworks, you still are on the hook for all 5 reserved instances.