CommonAutoScalingGroupProps

class aws_cdk.aws_autoscaling.CommonAutoScalingGroupProps(*, allow_all_outbound=None, associate_public_ip_address=None, auto_scaling_group_name=None, block_devices=None, cooldown=None, desired_capacity=None, group_metrics=None, health_check=None, ignore_unmodified_size_properties=None, instance_monitoring=None, key_name=None, max_capacity=None, max_instance_lifetime=None, min_capacity=None, notifications=None, notifications_topic=None, replacing_update_min_successful_instances_percent=None, resource_signal_count=None, resource_signal_timeout=None, rolling_update_configuration=None, signals=None, spot_price=None, update_policy=None, update_type=None, vpc_subnets=None)

Bases: object

Basic properties of an AutoScalingGroup, except the exact machines to run and where they should run.

Constructs that want to create AutoScalingGroups can inherit this interface and specialize the essential parts in various ways.

Parameters
  • allow_all_outbound (Optional[bool]) – Whether the instances can initiate connections to anywhere by default. Default: true

  • associate_public_ip_address (Optional[bool]) – Whether instances in the Auto Scaling Group should have public IP addresses associated with them. Default: - Use subnet setting.

  • auto_scaling_group_name (Optional[str]) – The name of the Auto Scaling group. This name must be unique per Region per account. Default: - Auto generated by CloudFormation

  • block_devices (Optional[List[BlockDevice]]) – Specifies how block devices are exposed to the instance. You can specify virtual devices and EBS volumes. Each instance that is launched has an associated root device volume, either an Amazon EBS volume or an instance store volume. You can use block device mappings to specify additional EBS volumes or instance store volumes to attach to an instance when it is launched. Default: - Uses the block device mapping of the AMI

  • cooldown (Optional[Duration]) – Default scaling cooldown for this AutoScalingGroup. Default: Duration.minutes(5)

  • desired_capacity (Union[int, float, None]) – Initial amount of instances in the fleet. If this is set to a number, every deployment will reset the amount of instances to this number. It is recommended to leave this value blank. Default: minCapacity, and leave unchanged during deployment

  • group_metrics (Optional[List[GroupMetrics]]) – Enable monitoring for group metrics, these metrics describe the group rather than any of its instances. To report all group metrics use GroupMetrics.all() Group metrics are reported in a granularity of 1 minute at no additional charge. Default: - no group metrics will be reported

  • health_check (Optional[HealthCheck]) – Configuration for health checks. Default: - HealthCheck.ec2 with no grace period

  • ignore_unmodified_size_properties (Optional[bool]) – If the ASG has scheduled actions, don’t reset unchanged group sizes. Only used if the ASG has scheduled actions (which may scale your ASG up or down regardless of cdk deployments). If true, the size of the group will only be reset if it has been changed in the CDK app. If false, the sizes will always be changed back to what they were in the CDK app on deployment. Default: true

  • instance_monitoring (Optional[Monitoring]) – Controls whether instances in this group are launched with detailed or basic monitoring. When detailed monitoring is enabled, Amazon CloudWatch generates metrics every minute and your account is charged a fee. When you disable detailed monitoring, CloudWatch generates metrics every 5 minutes. Default: - Monitoring.DETAILED

  • key_name (Optional[str]) – Name of SSH keypair to grant access to instances. Default: - No SSH access will be possible.

  • max_capacity (Union[int, float, None]) – Maximum number of instances in the fleet. Default: desiredCapacity

  • max_instance_lifetime (Optional[Duration]) – The maximum amount of time that an instance can be in service. The maximum duration applies to all current and future instances in the group. As an instance approaches its maximum duration, it is terminated and replaced, and cannot be used again. You must specify a value of at least 604,800 seconds (7 days). To clear a previously set value, leave this property undefined. Default: none

  • min_capacity (Union[int, float, None]) – Minimum number of instances in the fleet. Default: 1

  • notifications (Optional[List[NotificationConfiguration]]) – Configure autoscaling group to send notifications about fleet changes to an SNS topic(s). Default: - No fleet change notifications will be sent.

  • notifications_topic (Optional[ITopic]) – (deprecated) SNS topic to send notifications about fleet changes. Default: - No fleet change notifications will be sent.

  • replacing_update_min_successful_instances_percent (Union[int, float, None]) – (deprecated) Configuration for replacing updates. Only used if updateType == UpdateType.ReplacingUpdate. Specifies how many instances must signal success for the update to succeed. Default: minSuccessfulInstancesPercent

  • resource_signal_count (Union[int, float, None]) – (deprecated) How many ResourceSignal calls CloudFormation expects before the resource is considered created. Default: 1 if resourceSignalTimeout is set, 0 otherwise

  • resource_signal_timeout (Optional[Duration]) – (deprecated) The length of time to wait for the resourceSignalCount. The maximum value is 43200 (12 hours). Default: Duration.minutes(5) if resourceSignalCount is set, N/A otherwise

  • rolling_update_configuration (Optional[RollingUpdateConfiguration]) – (deprecated) Configuration for rolling updates. Only used if updateType == UpdateType.RollingUpdate. Default: - RollingUpdateConfiguration with defaults.

  • signals (Optional[Signals]) – Configure waiting for signals during deployment. Use this to pause the CloudFormation deployment to wait for the instances in the AutoScalingGroup to report successful startup during creation and updates. The UserData script needs to invoke cfn-signal with a success or failure code after it is done setting up the instance. Without waiting for signals, the CloudFormation deployment will proceed as soon as the AutoScalingGroup has been created or updated but before the instances in the group have been started. For example, to have instances wait for an Elastic Load Balancing health check before they signal success, add a health-check verification by using the cfn-init helper script. For an example, see the verify_instance_health command in the Auto Scaling rolling updates sample template: https://github.com/awslabs/aws-cloudformation-templates/blob/master/aws/services/AutoScaling/AutoScalingRollingUpdates.yaml Default: - Do not wait for signals

  • spot_price (Optional[str]) – The maximum hourly price (in USD) to be paid for any Spot Instance launched to fulfill the request. Spot Instances are launched when the price you specify exceeds the current Spot market price. Default: none

  • update_policy (Optional[UpdatePolicy]) – What to do when an AutoScalingGroup’s instance configuration is changed. This is applied when any of the settings on the ASG are changed that affect how the instances should be created (VPC, instance type, startup scripts, etc.). It indicates how the existing instances should be replaced with new instances matching the new config. By default, nothing is done and only new instances are launched with the new config. Default: - UpdatePolicy.rollingUpdate() if using init, UpdatePolicy.none() otherwise

  • update_type (Optional[UpdateType]) – (deprecated) What to do when an AutoScalingGroup’s instance configuration is changed. This is applied when any of the settings on the ASG are changed that affect how the instances should be created (VPC, instance type, startup scripts, etc.). It indicates how the existing instances should be replaced with new instances matching the new config. By default, nothing is done and only new instances are launched with the new config. Default: UpdateType.None

  • vpc_subnets (Optional[SubnetSelection]) – Where to place instances within the VPC. Default: - All Private subnets.

Attributes

allow_all_outbound

Whether the instances can initiate connections to anywhere by default.

Default

true

Return type

Optional[bool]

associate_public_ip_address

Whether instances in the Auto Scaling Group should have public IP addresses associated with them.

Default
  • Use subnet setting.

Return type

Optional[bool]

auto_scaling_group_name

The name of the Auto Scaling group.

This name must be unique per Region per account.

Default
  • Auto generated by CloudFormation

Return type

Optional[str]

block_devices

Specifies how block devices are exposed to the instance. You can specify virtual devices and EBS volumes.

Each instance that is launched has an associated root device volume, either an Amazon EBS volume or an instance store volume. You can use block device mappings to specify additional EBS volumes or instance store volumes to attach to an instance when it is launched.

Default
  • Uses the block device mapping of the AMI

See

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/block-device-mapping-concepts.html

Return type

Optional[List[BlockDevice]]

cooldown

Default scaling cooldown for this AutoScalingGroup.

Default

Duration.minutes(5)

Return type

Optional[Duration]

desired_capacity

Initial amount of instances in the fleet.

If this is set to a number, every deployment will reset the amount of instances to this number. It is recommended to leave this value blank.

Default

minCapacity, and leave unchanged during deployment

See

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-as-group.html#cfn-as-group-desiredcapacity

Return type

Union[int, float, None]

group_metrics

Enable monitoring for group metrics, these metrics describe the group rather than any of its instances.

To report all group metrics use GroupMetrics.all() Group metrics are reported in a granularity of 1 minute at no additional charge.

Default
  • no group metrics will be reported

Return type

Optional[List[GroupMetrics]]

health_check

Configuration for health checks.

Default
  • HealthCheck.ec2 with no grace period

Return type

Optional[HealthCheck]

ignore_unmodified_size_properties

If the ASG has scheduled actions, don’t reset unchanged group sizes.

Only used if the ASG has scheduled actions (which may scale your ASG up or down regardless of cdk deployments). If true, the size of the group will only be reset if it has been changed in the CDK app. If false, the sizes will always be changed back to what they were in the CDK app on deployment.

Default

true

Return type

Optional[bool]

instance_monitoring

Controls whether instances in this group are launched with detailed or basic monitoring.

When detailed monitoring is enabled, Amazon CloudWatch generates metrics every minute and your account is charged a fee. When you disable detailed monitoring, CloudWatch generates metrics every 5 minutes.

Default
  • Monitoring.DETAILED

See

https://docs.aws.amazon.com/autoscaling/latest/userguide/as-instance-monitoring.html#enable-as-instance-metrics

Return type

Optional[Monitoring]

key_name

Name of SSH keypair to grant access to instances.

Default
  • No SSH access will be possible.

Return type

Optional[str]

max_capacity

Maximum number of instances in the fleet.

Default

desiredCapacity

Return type

Union[int, float, None]

max_instance_lifetime

The maximum amount of time that an instance can be in service.

The maximum duration applies to all current and future instances in the group. As an instance approaches its maximum duration, it is terminated and replaced, and cannot be used again.

You must specify a value of at least 604,800 seconds (7 days). To clear a previously set value, leave this property undefined.

Default

none

See

https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-max-instance-lifetime.html

Return type

Optional[Duration]

min_capacity

Minimum number of instances in the fleet.

Default

1

Return type

Union[int, float, None]

notifications

Configure autoscaling group to send notifications about fleet changes to an SNS topic(s).

Default
  • No fleet change notifications will be sent.

See

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-as-group.html#cfn-as-group-notificationconfigurations

Return type

Optional[List[NotificationConfiguration]]

notifications_topic

(deprecated) SNS topic to send notifications about fleet changes.

Default
  • No fleet change notifications will be sent.

Deprecated

use notifications

Stability

deprecated

Return type

Optional[ITopic]

replacing_update_min_successful_instances_percent

(deprecated) Configuration for replacing updates.

Only used if updateType == UpdateType.ReplacingUpdate. Specifies how many instances must signal success for the update to succeed.

Default

minSuccessfulInstancesPercent

Deprecated

Use signals instead

Stability

deprecated

Return type

Union[int, float, None]

resource_signal_count

(deprecated) How many ResourceSignal calls CloudFormation expects before the resource is considered created.

Default

1 if resourceSignalTimeout is set, 0 otherwise

Deprecated

Use signals instead.

Stability

deprecated

Return type

Union[int, float, None]

resource_signal_timeout

(deprecated) The length of time to wait for the resourceSignalCount.

The maximum value is 43200 (12 hours).

Default

Duration.minutes(5) if resourceSignalCount is set, N/A otherwise

Deprecated

Use signals instead.

Stability

deprecated

Return type

Optional[Duration]

rolling_update_configuration

(deprecated) Configuration for rolling updates.

Only used if updateType == UpdateType.RollingUpdate.

Default
  • RollingUpdateConfiguration with defaults.

Deprecated

Use updatePolicy instead

Stability

deprecated

Return type

Optional[RollingUpdateConfiguration]

signals

Configure waiting for signals during deployment.

Use this to pause the CloudFormation deployment to wait for the instances in the AutoScalingGroup to report successful startup during creation and updates. The UserData script needs to invoke cfn-signal with a success or failure code after it is done setting up the instance.

Without waiting for signals, the CloudFormation deployment will proceed as soon as the AutoScalingGroup has been created or updated but before the instances in the group have been started.

For example, to have instances wait for an Elastic Load Balancing health check before they signal success, add a health-check verification by using the cfn-init helper script. For an example, see the verify_instance_health command in the Auto Scaling rolling updates sample template:

https://github.com/awslabs/aws-cloudformation-templates/blob/master/aws/services/AutoScaling/AutoScalingRollingUpdates.yaml

Default
  • Do not wait for signals

Return type

Optional[Signals]

spot_price

The maximum hourly price (in USD) to be paid for any Spot Instance launched to fulfill the request.

Spot Instances are launched when the price you specify exceeds the current Spot market price.

Default

none

Return type

Optional[str]

update_policy

What to do when an AutoScalingGroup’s instance configuration is changed.

This is applied when any of the settings on the ASG are changed that affect how the instances should be created (VPC, instance type, startup scripts, etc.). It indicates how the existing instances should be replaced with new instances matching the new config. By default, nothing is done and only new instances are launched with the new config.

Default
  • UpdatePolicy.rollingUpdate() if using init, UpdatePolicy.none() otherwise

Return type

Optional[UpdatePolicy]

update_type

(deprecated) What to do when an AutoScalingGroup’s instance configuration is changed.

This is applied when any of the settings on the ASG are changed that affect how the instances should be created (VPC, instance type, startup scripts, etc.). It indicates how the existing instances should be replaced with new instances matching the new config. By default, nothing is done and only new instances are launched with the new config.

Default

UpdateType.None

Deprecated

Use updatePolicy instead

Stability

deprecated

Return type

Optional[UpdateType]

vpc_subnets

Where to place instances within the VPC.

Default
  • All Private subnets.

Return type

Optional[SubnetSelection]