I have little query related to reserved c3.large going to 1 year and it was reserved for 1 year does it will renew automatically or i need to do it manually.
If yes please advise how i can do it.
You don't actually 'renew' a reserved instance - you buy another one. Remember a reserved instance is just a billing construct and has nothing to do with any particular instance that may or may not be running.
So when the term of the reserved instance runs out, any instances you have simply start getting billed at the on-demand rate, unless and until you purchase another reserved instance.
You have to do it manually. From: Reserved Instances
Reserved instances do not renew automatically; you can continue using the EC2 instance without interruption, but you will be charged
On-Demand rates.
The other answers here are correct, but for my use case the easiest thing was to let the instance expire and then "Purchase More Like These". See details here.
Related
Hey I just want to know info about the reserved rds instance. Suppose one purchase an reserve rds plan for an year with no up front payment method. And there is no rds instance currently running that matches the same setting like db instance class etc as of the reserved one. Will I am going to charge for it or not, as reserve rds plan is of 1 year.
Thanks
Yes. With reserved instances you pay for it, if you use it or not.
One of my reserved instance is about to expire in near futre.
I'd like to buy the reserved plan for the instance
(I'm not planning to run 2 such instances at the same time)
I just want to extend the reserved period if it makes sense.
How do I do that?
feels like this might be very good fit for stackoverflow, please let me know if there's a better qna site for this.
From Learn How to Renew an EC2 Reserved Instance:
You can queue your Reserved Instance purchases for a specific date and time in the future. To renew your EC2 RI automatically, you can queue an RI purchase for the date and time that your existing RI expires. On the scheduled date and time, AWS automatically purchases the RI for you using your account's default payment method.
Before renewing, I would suggest you also consider AWS Savings Plans, which are more flexible than Reserved Instances. Also, consider whether you want a 1-year term or a 3-year term and, for RIs, whether it is Zonal or Regional.
I have a regular AWS EC2 m3.large instance that I use for a few days a month, when I'm not using it I stop it, and just start it when I need it. I have the understanding that I only pay for it when it is actually running, is that correct ?
I've just recently noticed reserved instances, I'm happy to commit to a term of a few years, however I don't need to use it every day. So assuming my first assumption is correct does that also apply to reserved instances or do i have to pay every day whether or not Im using.
If is a good idea can I convert my existing instance to a reserved instance or do I have to setup a new machine from scratch ?
You have to pay for reserved instance even if you are not using it. The capacity is already reserved for it and you may have already paid a partial payment upfront for you or you can choose no upfront. Reserved instance is use it or lose it.
You can use a calculator and see if reserved instance can save you $$.
You can convert your on-demand to reserved instance just by reserving an instance of same type in the same availability zone. AWS has made the instance reservation more flexible recently but if you are running a single instance, just reserve an instance of same type in the same availability zone. You can choose partial/no upfront, one or three year terms.
In us-east-1, on-demand cost for m4.large is $0.10/hour.
Monthly on-demand cost is: $72/month
Approximate reserved instance (one year) cost with no upfront: $50/month
Number of on-demand hours for $50: 500 hours (20 days)
If you plan to run for less than 500 hours/month, then you should go for on-demand. Remember, with reserved instances you are guaranteed an instance by AWS. Sometimes, on-demand may run out of capacity and you have to choose a different instance type. It is very rare but happens sometimes.
If you "reserve" an instance you have to pay for it.
m3.large instances that you stop you do not have to pay for, but keep in mind you might have to pay for other things like the EBS volume attached.
Judging by what you've said, its sounds like it's cheaper to start/stop the instance when you need it.
Edit: This question is NOT to ask about "Spot Instances"; this question is to ask regular "On Demand Instance". I think I need to clarify this, after reading comments below.
Basically, my question is about whether I should consider the risk that when I need to launch an EC2 instance, but that EC2 region has run out of capacity and can't fulfill my request.
I understand the chance for the above situation is extremely low, but I'd like to understand if AWS has any SLA to make sure that situation/risk won't happen.
There are protective controls in place to make the unavailability of a particular type of instance in a particular availability zone at a particular time unlikely... but it's possible, and there is no assurance provided by AWS that a given type of EC2 instance will be available for launch, on-demand, at any particular time, in any particular Availability Zone unless you purchased reserved instances of that type, specifically in that availability zone. In that case, there is supposed to always be sufficient hardware available so that you can have the number of paid reserved instances running, at minimum, including the ability to launch enough new instances to bring the total up to that minimum.
Reserved instances are commonly discussed in the context of their associated discount, but they have two purposes:
Reserved Instances are not physical instances, but rather a billing discount applied to the use of On-Demand Instances in your account. These On-Demand Instances must match certain attributes in order to benefit from the billing discount.
When you purchase Reserved Instances in a specific Availability Zone, they provide a capacity reservation. (emphasis added)
For example, if you purchased 4 reserved t2.2xlarge instances in us-east-2a, the assurance is that you will always be able to launch enough to bring the total running instances of that type in that zone to 4. If you already have 4, there's not an assurance of being able to start more, but there is an assurance that if you stop them, you will be able to start them again.
Pricing models for reserved instances has changed over the years, such that reserved instances are generally billed at the same rate whether they're running or not, so you can look at it one of two ways:
If you need the capacity all the time, you're getting a substantial discount... or, if you don't need the capacity all the time, you're technically paying all the time for capacity that is largely unneeded, but you are still paying less than you'd pay for on-demand instances without reservations, and you can either leave it running or launch it when you need it.
Should you consider the risk that an entire region has widespread capacity issues? You should consider it, but there are, historically speaking, other significant outage scenarios that are more likely... EBS and S3 have both had failures that impaired the ability to launch instances, even though the capacity was idle in EC2.
Yes. I've had API calls to create EC2 resources fail many times due to lack of available AWS resources. I most commonly see this when attempting to create a new EC2 instance with Dedicated Tenancy in a specific Availability Zone.
Yes. It is possible your instance request cannot be fulfilled. On-Demand instance does not guarantee you an instance. In particular,t2.small instances are more likely to be not fulfilled based on my experience. It is possible, AWS has only limited number of t2.small instances.
How can you make sure it is always fulfilled?
Reserve the instances for you so that it is not given to anyone else. But there is a cost associated with it. You have pay for the instance irrespective of whether you use it not. I am talking in general terms. Reserved instance is a complex topic, but that is the route you should take if you want AWS to guarantee you an instance.
The answer is yes, your launch request can fail because there is no available capacity in the relevant Availability Zone. I would say that it's a rare occurrence, but certainly possible.
You can mitigate by using multiple zones in the same region, other regions, or by using Reserved Instances.
Today it happened in an AWS account that I manage. If I am not wrong it was the family r4, exactly an r4.xlarge instance (4 hours ago) in Virgina Region. I had to choose a different AZ. That is why AWS always recommends working with more than one AZ.
But for that reason, I started to use Scheduled Reserved Instances
You always will have for a period of time a reserved capacity of a family type of instance(s).
Sure, it works if you have a defined schedule or workflow.
Hope it helps you.
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.