EC2 Fleet and Spot Fleet are designed to be a useful way to launch a fleet of tens, hundreds, or thousands of Amazon EC2 instances in a single operation.

The following example launches Spot Instances in a capacity-optimized fleet. Request-EC2SpotFleet ` -SpotFleetRequestConfig_TargetCapacity 50 ` -SpotFleetRequestConfig_AllocationStrategy "CapacityOptimized" ` -SpotFleetRequestConfig_IamFleetRole "arn:aws:iam::123456789012:role/my-spot-fleet-role" ` -SpotFleetRequestConfig_LaunchTemplateConfig @($launchConfig)

The Spot Fleet launches the instances in the lowest-priced Availability Zone that has a default subnet. The price you pay does not exceed the On-Demand price. { "TargetCapacity": 20, "IamFleetRole": "arn:aws:iam::123456789012:role/aws-ec2-spot-fleet-tagging-role", "LaunchSpecifications": [ ...

An EC2 Fleet or Spot Fleet request type defines whether the request is synchronous or asynchronous, and whether it makes a one-time request for the desired target capacity or makes a continued effort to maintain the target capacity over time, with options including request and maintain, and ...

October 12, 2025 - Amazon Web Services (AWS) Spot Fleets are collections of AWS spot instances, virtual servers from Amazon’s pool of spare capacity, offered at discounts of up to 90%. Spot instances need to be carefully managed, because they are terminated by Amazon at short notice when the market price goes about your bidding price.

The fleet then requests Spot Instances from the lowest priced of these pools. The price capacity optimized allocation strategy is the best choice for most Spot workloads, such as stateless containerized applications, microservices, web applications, data and analytics jobs, and batch processing. If you're using the AWS CLI, the parameter name is price-capacity-optimized for EC2 Fleet and priceCapacityOptimized for Spot Fleet.

To start using a Spot Fleet, create a request that includes the total target capacity for Spot Instances, an optional On-Demand portion, and either manually specify an AMI and a key pair, or specify a launch template that includes the configuration for the instances in the fleet.

IamFleetRole must be set up to point to the ARN of an IAM role that grants the Spot Fleet the permission to request, launch, terminate, and tag instances on your behalf. For this purpose, you are going to first retrieve the ARN of the Service-Linked role named AWSServiceRoleForEC2SpotFleet.

The Spot Fleet request specifies the total target capacity and the On-Demand target capacity.

October 4, 2024 - When you request a Spot Instance, you define a maximum Spot price you’re willing to pay. The hourly Spot price varies based on demand for unused capacity in AWS. As long as the current Spot price is lower than your max price, your instance will be launched.

December 25, 2024 - Use Cases: Similar to Spot Instances, ... active, or disabled). Then terminate the associated Spot Instances. A Spot Fleet is a collection of Spot Instances and, optionally, On-Demand Instances....

The value for DefaultTargetCapacityType specifies whether Spot or On-Demand Instances should be used to meet the TotalTargetCapacity. By setting SingleInstanceType and SingleAvailabilityZone to true, you are forcing the EC2 Fleet request to provision all the instances in the same Availability Zone and of the same type. Copy and paste this command to create the EC2 Fleet and export its identifier to an environment variable to later monitor the status of the fleet. export FLEET_ID=$(aws ec2 create-fleet --cli-input-json file://ec2-fleet-config.json | jq -r '.FleetId')

This policy grants Spot Fleet permission to launch, tag, and terminate instances on your behalf. Specify the role in your Spot Fleet request. You must also have the AWSServiceRoleForEC2Spot and AWSServiceRoleForEC2SpotFleet service-linked roles for Amazon EC2 Spot and Spot Fleet.

Learn how to describe your Spot Fleet configuration, the instances in your Spot Fleet, and the event history of your Spot Fleet.

With spot fleets, you can request a variety of different instance types that meet your requirements. Additionally, you can spread your spot fleet bet across multiple AZs to increase the likelihood of getting your instance fulfilled. It’s like playing rollette and being able to bet a single chip on multiple numbers.

Learn about the different options for configuring your EC2 Fleet and Spot Fleet.

Scaling your fleet on a schedule enables you to scale your application in response to predictable changes in demand. By creating scheduled actions, you can instruct Spot Fleet to perform scaling activities at specific times. To create a scheduled action, you must specify an existing Spot Fleet, the time when the scaling activity must occur, and the desired minimum and maximum capacity.

December 13, 2022 - When spot instances are terminated, Spot Fleet attempts to replace them using the lowest price option available. While AWS Spot Fleet enables you to manage a large group or fleet of spot instances with different allocation strategies (i.e.

Indicates whether running Spot Instances should be terminated if you decrease the target capacity of the Spot Fleet request below the current size of the Spot Fleet. ... The number of units fulfilled by this request compared to the set target capacity. You cannot set this value. ... The number of On-Demand units fulfilled by this request compared to the set target On-Demand capacity. ... The Amazon Resource Name (ARN) of an AWS Identity and Access Management (IAM) role that grants the Spot Fleet the permission to request, launch, terminate, and tag instances on your behalf.

Learn how to use automatically increase or decrease the target capacity of your Spot Fleet based on demand.