FleetLaunchTemplateOverrides

Describes overrides for a launch template.

availabilityZone

The Availability Zone in which to launch the instances.

Type: String

Required: No

imageId

The ID of the AMI in the format ami-17characters00000.

Alternatively, you can specify a Systems Manager parameter, using one of the following formats. The Systems Manager parameter will resolve to an AMI ID on launch.

To reference a public parameter:

resolve:ssm:public-parameter

To reference a parameter stored in the same account:

resolve:ssm:parameter-name
resolve:ssm:parameter-name:version-number
resolve:ssm:parameter-name:label

To reference a parameter shared from another AWS account:

resolve:ssm:parameter-ARN
resolve:ssm:parameter-ARN:version-number
resolve:ssm:parameter-ARN:label

For more information, see Use a Systems Manager parameter instead of an AMI ID in the Amazon EC2 User Guide.

Note

This parameter is only available for fleets of type instant. For fleets of type maintain and request, you must specify the AMI ID in the launch template.

Type: String

Required: No

instanceRequirements

The attributes for the instance types. When you specify instance attributes, Amazon EC2 will identify instance types with those attributes.

Note

If you specify InstanceRequirements, you can't specify InstanceType.

Type: InstanceRequirements object

Required: No

instanceType

The instance type.

mac1.metal is not supported as a launch template override.

Note

If you specify InstanceType, you can't specify InstanceRequirements.

Type: String

Required: No

maxPrice

The maximum price per unit hour that you are willing to pay for a Spot Instance. We do not recommend using this parameter because it can lead to increased interruptions. If you do not specify this parameter, you will pay the current Spot price.

Important

If you specify a maximum price, your instances will be interrupted more frequently than if you do not specify this parameter.

Type: String

Required: No

placement

The location where the instance launched, if applicable.

Type: PlacementResponse object

Required: No

priority

The priority for the launch template override. The highest priority is launched first.

If the On-Demand AllocationStrategy is set to prioritized, EC2 Fleet uses priority to determine which launch template override to use first in fulfilling On-Demand capacity.

If the Spot AllocationStrategy is set to capacity-optimized-prioritized, EC2 Fleet uses priority on a best-effort basis to determine which launch template override to use in fulfilling Spot capacity, but optimizes for capacity first.

Valid values are whole numbers starting at 0. The lower the number, the higher the priority. If no number is set, the override has the lowest priority. You can set the same priority for different launch template overrides.

Type: Double

Required: No

subnetId

The ID of the subnet in which to launch the instances.

Type: String

Required: No

weightedCapacity

The number of units provided by the specified instance type. These are the same units that you chose to set the target capacity in terms of instances, or a performance characteristic such as vCPUs, memory, or I/O.

If the target capacity divided by this value is not a whole number, Amazon EC2 rounds the number of instances to the next whole number. If this value is not specified, the default is 1.

Note

When specifying weights, the price used in the lowest-price and price-capacity-optimized allocation strategies is per unit hour (where the instance price is divided by the specified weight). However, if all the specified weights are above the requested TargetCapacity, resulting in only 1 instance being launched, the price used is per instance hour.

Type: Double

Required: No

FleetLaunchTemplateOverrides

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