June 18, 2024


The primary AWS service I used, greater than ten years in the past, was Amazon Elastic Compute Cloud (Amazon EC2). Over time, EC2 has added a wide array of occasion varieties optimized to suit completely different use instances, with a various mixture of CPU/GPU, reminiscence, storage, and networking capability to provide the flexibility to decide on the suitable mixture of sources in your functions.

One of many key benefits of the cloud is elasticity. With EC2 Fleet, you’ll be able to synchronously request capability throughout a number of occasion varieties and buy choices, launching your situations throughout a number of Availability Zones, utilizing the On-Demand, Reserved, and Spot Situations collectively. With EC2 Auto Scaling, you’ll be able to robotically add or take away EC2 situations in accordance with situations you outline and add superior occasion administration capabilities akin to heat swimming pools, occasion refresh, and well being checks. With these instruments, you might want to manually replace your configurations to profit from the most recent EC2 situations. Additionally, whenever you use EC2 Spot Situations to optimize your prices, it is necessary that you choose a number of occasion varieties to entry the very best quantity of Spot capability. Till now, there was no straightforward strategy to construct and preserve occasion sort configurations in a versatile means.

Immediately, I’m completely satisfied to share that we’re introducing attribute-based occasion sort choice (ABS), a brand new characteristic that permits you to categorical your occasion necessities as a set of attributes, akin to vCPU, reminiscence, and storage. Your necessities are translated by ABS to all matching occasion varieties, simplifying the creation and upkeep of occasion sort configurations. This additionally permits you to robotically use newer era occasion varieties when they’re launched and entry a broader vary of capability through EC2 Spot Situations. EC2 Fleet and EC2 Auto Scaling choose and launch situations that match the desired attributes, eradicating the necessity to manually choose occasion varieties.

ABS is right for versatile workloads and frameworks, akin to when operating containers or internet fleets, processing massive information, and implementing steady integration and deployment (CI/CD) tooling. When utilizing Spot Situations, as a substitute of choosing and getting into tens of occasion varieties and sizes, now you can simply use a easy attribute config to cowl all of them and embrace new ones as they arrive out.

How Attribute-Based mostly Occasion Kind Choice Works
With ABS, you substitute the record of occasion varieties along with your occasion necessities. You possibly can specify occasion necessities inside a launch template or within the EC2 Fleet or EC2 Auto Scaling requests as a launch template override.

ABS works in two steps:

  • First, ABS determines a record of occasion varieties based mostly on specified attributes, AWS Area, Availability Zone, and value.
  • Then, EC2 Auto Scaling or EC2 Fleet applies the chosen allocation technique to that record.

For Spot Situations, ABS helps the capacity-optimized and the lowest-price allocation methods.

For On-Demand Situations, ABS helps the lowest-price allocation technique. EC2 Auto Scaling or EC2 Fleet will resolve ABS attributes to a listing of occasion varieties and can launch the bottom priced occasion first to satisfy the On-Demand portion of the capability request, transferring to the following lowest priced occasion if wanted.

By default ABS allows value safety to maintain your spending beneath management. Value safety makes ABS keep away from provisioning overly costly occasion varieties even when they occur to suit the attributes you chose and retains the costs of provisioned situations inside sure boundaries. With value safety enabled, ABS doesn’t choose occasion varieties whose value is above value safety thresholds. There are two separate thresholds for Spot and On-Demand situations which you could optionally customise.

Let’s see how ABS works in follow with a few examples.

Utilizing Attribute-Based mostly Occasion Kind Choice with EC2 Auto Scaling
I exploit the AWS Command Line Interface (CLI) with the --generate-cli-skeleton parameter to generate a file in YAML format with all of the parameters accepted by the CreateAutoScalingGroup API.

aws autoscaling create-auto-scaling-group 
    --generate-cli-skeleton yaml-input > create-asg.yaml

Within the YAML file, there’s a new InstanceRequirements part that can be utilized to override the configuration of the launch template. These are all of the attributes I can select from with some pattern values:

  VCpuCount:  # [REQUIRED] 
    Min: zero
    Max: zero
  MemoryMiB: # [REQUIRED] 
    Min: zero
    Max: zero
  - amd
    Min: zero.zero
    Max: zero.zero
  - ''
  - earlier
  SpotMaxPricePercentageOverLowestPrice: zero
  OnDemandMaxPricePercentageOverLowestPrice: zero
  BareMetal: required  #  Legitimate values are: included, excluded, required.
  BurstablePerformance: excluded #  Legitimate values are: included, excluded, required.
  RequireHibernateSupport: true
    Min: zero
    Max: zero
  LocalStorage: required  #  Legitimate values are: included, excluded, required.
  - ssd
    Min: zero.zero
    Max: zero.zero
    Min: zero
    Max: zero
  - inference
    Min: zero
    Max: zero
  - amazon-web-services
  - a100
    Min: zero
    Max: zero

As a substitute of offering a listing of overrides, every having an InstanceType attribute with a single occasion sort chosen, I can now choose the occasion varieties based mostly on my necessities. I can specify the minimal and most quantity of vCPUs, and the vary of reminiscence. Optionally, I can ask for a minimal quantity of reminiscence per vCPUs.

There are numerous extra attributes that I can choose from. For instance, I can embrace, exclude, or require the usage of naked steel or burstable situations. I can add networking or storage necessities. If obligatory, I can ask for GPU or FPGA accelerators, and so forth.

In my case, I ask for situations with two to 4 vCPUs and at the least 2048 MiB of reminiscence. Beforehand, it will have taken about 40 overrides, one for every occasion sort that meets these necessities, however with ABS, I simply should specify three parameters within the InstanceRequirements part. That is the total configuration file I’m going to make use of to create the Auto Scaling group:

AutoScalingGroupName: 'my-asg' # [REQUIRED] 
      LaunchTemplateId: 'lt-0537239d9aef10a77'
    - InstanceRequirements:
        VCpuCount: # [REQUIRED] 
          Min: 2
          Max: four
        MemoryMiB: # [REQUIRED] 
          Min: 2048
    OnDemandPercentageAboveBaseCapacity: 50
    SpotAllocationStrategy: 'capacity-optimized'
MinSize: zero # [REQUIRED] 
MaxSize: 100 # [REQUIRED] 
DesiredCapacity: four
VPCZoneIdentifier: 'subnet-e76a128a,subnet-e66a128b,subnet-e16a128c'

I create the Auto Scaling group passing the configuration file with the --cli-input-yaml parameter:

aws autoscaling create-auto-scaling-group 
    --cli-input-yaml file://my-create-asg.yaml

After a couple of minutes, 4 EC2 situations (similar to my DesiredCapacity) are operating within the EC2 console. Within the record, I discover each C3 and C5a situations, spanning each time and CPU producer.

Console screenshot.

Of these situations, 50 % is On-Demand (based mostly on the OnDemandPercentageAboveBaseCapacity possibility within the InstancesDistribution part). Within the Spot Request tab of the EC2 console, I see the 2 requests:

Console screenshot.

As anticipated, all occasion varieties observe my necessities and have measurement giant. Nonetheless, I shortly notice my utility wants extra compute capability in every occasion. I replace the Auto Scaling group with the brand new necessities, asking for extra vCPUs (between 4 and 6):

aws autoscaling update-auto-scaling-group 
    --auto-scaling-group-name my-asg 
    --mixed-instances-policy '{
            "Overrides": [
                    "VCpuCount":"Min": 4, "Max": 6,

Then, I begin the occasion refresh of the Auto Scaling group:

aws autoscaling start-instance-refresh 
    --auto-scaling-group-name my-asg

EC2 Auto Scaling performs a rolling alternative of the situations based mostly on the brand new necessities. After a couple of minutes, all situations have been changed by new ones with measurement xlarge, and I’ve a mixture of C5, C5a, and M3 situations operating. All earlier situations have been terminated.

Console screenshot.

Just like earlier than, two of the brand new situations are launched utilizing Spot requests. The earlier Spot requests have been closed.

Console screenshot.

Find out how to Preview Matching Situations with out Launching Them
To raised perceive how the brand new ABS works, I exploit the brand new EC2 GetInstanceTypesFromInstanceRequirements API. This API returns the record of occasion varieties matching my necessities.

First, I create the YAML parameter file:

aws ec2 get-instance-types-from-instance-requirements --generate-cli-skeleton yaml-input > necessities.yaml

I edit the file with the identical necessities I used to replace the Auto Scaling group. This time, I additionally ask to make use of present era situations:

ArchitectureTypes:  # [REQUIRED] 
- x86_64
VirtualizationTypes: # [REQUIRED] 
- hvm
InstanceRequirements: # [REQUIRED] 
    Min: four
    Max: 6
    Min: 2048
    - present

Observe that right here I needed to specify the kind of structure (x86_64) and virtualization (hvm). When creating the Auto Scaling group, this info was supplied by the Amazon Machine Photos (AMI) utilized by the launch template.

Now, let’s preview all of the occasion varieties chosen by these necessities:

aws ec2 get-instance-types-from-instance-requirements 
    --cli-input-yaml file://necessities.yaml 
    --output desk

||             InstanceTypes            ||
||             InstanceType             ||
||  c4.xlarge                           ||
||  c5.xlarge                           ||
||  c5a.xlarge                          ||
||  c5ad.xlarge                         ||
||  c5d.xlarge                          ||
||  c5n.xlarge                          ||
||  d2.xlarge                           ||
||  d3.xlarge                           ||
||  d3en.xlarge                         ||
||  g3s.xlarge                          ||
||  g4ad.xlarge                         ||
||  g4dn.xlarge                         ||
||  i3.xlarge                           ||
||  i3en.xlarge                         ||
||  inf1.xlarge                         ||
||  m4.xlarge                           ||
||  m5.xlarge                           ||
||  m5a.xlarge                          ||
||  m5ad.xlarge                         ||
||  m5d.xlarge                          ||
||  m5dn.xlarge                         ||
||  m5n.xlarge                          ||
||  m5zn.xlarge                         ||
||  m6i.xlarge                          ||
||  p2.xlarge                           ||
||  r4.xlarge                           ||
||  r5.xlarge                           ||
||  r5a.xlarge                          ||
||  r5ad.xlarge                         ||
||  r5b.xlarge                          ||
||  r5d.xlarge                          ||
||  r5dn.xlarge                         ||
||  r5n.xlarge                          ||
||  x1e.xlarge                          ||
||  z1d.xlarge                          ||

Utilizing this new EC2 API, I can shortly check completely different necessities and see how they map to occasion varieties. When new occasion varieties are launched, they’re robotically added to the record in the event that they match my necessities.

Availability and Pricing
You should use attribute-based occasion sort choice (ABS) with EC2 Auto Scaling and EC2 Fleet right now in all public and GovCloud AWS Areas, except these based mostly in China the place we’d like extra time. You possibly can configure ABS utilizing the AWS Command Line Interface (CLI), AWS SDKs, AWS Administration Console, and AWS CloudFormation. There isn’t a further cost for utilizing ABS; you solely pay the usual EC2 pricing for the provisioned situations. For extra info on value safety, see the EC2 Auto Scaling documentation.

This new characteristic makes it straightforward to make use of versatile occasion sort configurations as a substitute of lengthy lists of occasion varieties. On this means, you’ll be able to robotically use newer era occasion varieties when they’re launched within the Area. Additionally, you’ll be able to simply entry extra capability along with your Spot requests.

Simplify your EC2 occasion sort configurations with attribute-based occasion sort choice.



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