CfnCreationPolicy

class aws_cdk.CfnCreationPolicy(*, auto_scaling_creation_policy=None, resource_signal=None, start_fleet=None)

Bases: object

Associate the CreationPolicy attribute with a resource to prevent its status from reaching create complete until AWS CloudFormation receives a specified number of success signals or the timeout period is exceeded.

To signal a resource, you can use the cfn-signal helper script or SignalResource API. AWS CloudFormation publishes valid signals to the stack events so that you track the number of signals sent.

The creation policy is invoked only when AWS CloudFormation creates the associated resource. Currently, the only AWS CloudFormation resources that support creation policies are AWS::AutoScaling::AutoScalingGroup, AWS::EC2::Instance, AWS::CloudFormation::WaitCondition and AWS::AppStream::Fleet.

Use the CreationPolicy attribute when you want to wait on resource configuration actions before stack creation proceeds. For example, if you install and configure software applications on an EC2 instance, you might want those applications to be running before proceeding. In such cases, you can add a CreationPolicy attribute to the instance, and then send a success signal to the instance after the applications are installed and configured. For a detailed example, see Deploying Applications on Amazon EC2 with AWS CloudFormation.

Parameters:

auto_scaling_creation_policy (Union[CfnResourceAutoScalingCreationPolicy, Dict[str, Any], None]) – For an Auto Scaling group replacement update, specifies how many instances must signal success for the update to succeed.
resource_signal (Union[CfnResourceSignal, Dict[str, Any], None]) – When AWS CloudFormation creates the associated resource, configures the number of required success signals and the length of time that AWS CloudFormation waits for those signals.
start_fleet (Optional[bool]) – For an AppStream Fleet creation, specifies that the fleet is started after creation.

ExampleMetadata:

fixture=_generated

Example:

# The code below shows an example of how to instantiate this type.
# The values are placeholders you should change.
import aws_cdk as cdk

cfn_creation_policy = cdk.CfnCreationPolicy(
    auto_scaling_creation_policy=cdk.CfnResourceAutoScalingCreationPolicy(
        min_successful_instances_percent=123
    ),
    resource_signal=cdk.CfnResourceSignal(
        count=123,
        timeout="timeout"
    ),
    start_fleet=False
)

Attributes

auto_scaling_creation_policy: For an Auto Scaling group replacement update, specifies how many instances must signal success for the update to succeed.

resource_signal: When AWS CloudFormation creates the associated resource, configures the number of required success signals and the length of time that AWS CloudFormation waits for those signals.

start_fleet: For an AppStream Fleet creation, specifies that the fleet is started after creation.