AWS CDK Reference

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v2.274.0

CfnWarmPoolPropsMixin Mixin ​

The AWS::AutoScaling::WarmPool resource creates a pool of pre-initialized EC2 instances that sits alongside the Auto Scaling group.

Whenever your application needs to scale out, the Auto Scaling group can draw on the warm pool to meet its new desired capacity.

When you create a warm pool, you can define a minimum size. When your Auto Scaling group scales out and the size of the warm pool shrinks, Amazon EC2 Auto Scaling launches new instances into the warm pool to maintain its minimum size.

For more information, see Warm pools for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide .

CloudFormation supports the UpdatePolicy attribute for Auto Scaling groups. During an update, if UpdatePolicy is set to AutoScalingRollingUpdate , CloudFormation replaces InService instances only. Instances in the warm pool are not replaced. The difference in which instances are replaced can potentially result in different instance configurations after the stack update completes. If UpdatePolicy is set to AutoScalingReplacingUpdate , you do not encounter this issue because CloudFormation replaces both the Auto Scaling group and the warm pool.

CloudFormation
AWS::AutoScaling::WarmPool
Source
Generated code
Type last changed
v2.269.0 · 16 Sep 2026

Initializer ​

ts
new CfnWarmPoolPropsMixin(props: CfnWarmPoolMixinProps, options?: CfnPropertyMixinOptions)
python
CfnWarmPoolPropsMixin(props: CfnWarmPoolMixinProps, options: typing.Optional[CfnPropertyMixinOptions] = None)
java
new CfnWarmPoolPropsMixin(CfnWarmPoolMixinProps props, CfnPropertyMixinOptions options)
csharp
new CfnWarmPoolPropsMixin(CfnWarmPoolMixinProps props, CfnPropertyMixinOptions? options = null)
go
NewCfnWarmPoolPropsMixin(Props CfnWarmPoolMixinProps, Options CfnPropertyMixinOptions)

Methods ​

applyTo(construct: IConstruct): voiddef apply_to(self, construct: IConstruct) -> Nonepublic void applyTo(IConstruct construct)public void ApplyTo(IConstruct construct)func ApplyTo(Construct IConstruct)#
Apply the mixin properties to the construct.
isMixin(x: any): boolean@staticmethod def is_mixin(x: Any) -> boolpublic static Boolean isMixin(Object x)public static bool IsMixin(object x)func IsMixin(X interface{}) *boolstatic#
Checks if `x` is a Mixin.
1 parameter · returns

Parameters

  • xxxxX — Any object.

Returns: true if x is an object created from a class which extends Mixin.

supports(construct: IConstruct): booleandef supports(self, construct: IConstruct) -> boolpublic Boolean supports(IConstruct construct)public bool Supports(IConstruct construct)func Supports(Construct IConstruct) *bool#
Check if this mixin supports the given construct.