Table of Contents

Class CommonAutoScalingGroupProps

Namespace
Amazon.CDK.AWS.AutoScaling
Assembly
Amazon.CDK.AWS.AutoScaling.dll

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

public class CommonAutoScalingGroupProps : ICommonAutoScalingGroupProps
Inheritance
CommonAutoScalingGroupProps
Implements
Inherited Members

Examples

// The code below shows an example of how to instantiate this type.
             // The values are placeholders you should change.
             using Amazon.CDK.AWS.AutoScaling;
             using Amazon.CDK.AWS.EC2;
             using Amazon.CDK.AWS.SNS;
             using Amazon.CDK;

             BlockDeviceVolume blockDeviceVolume;
             GroupMetrics groupMetrics;
             HealthCheck healthCheck;
             ScalingEvents scalingEvents;
             Signals signals;
             Subnet subnet;
             SubnetFilter subnetFilter;
             Topic topic;
             UpdatePolicy updatePolicy;
             var commonAutoScalingGroupProps = new CommonAutoScalingGroupProps {
                 AllowAllOutbound = false,
                 AssociatePublicIpAddress = false,
                 AutoScalingGroupName = "autoScalingGroupName",
                 BlockDevices = new [] { new BlockDevice {
                     DeviceName = "deviceName",
                     Volume = blockDeviceVolume,

                     // the properties below are optional
                     MappingEnabled = false
                 } },
                 Cooldown = Duration.Minutes(30),
                 DesiredCapacity = 123,
                 GroupMetrics = new [] { groupMetrics },
                 HealthCheck = healthCheck,
                 IgnoreUnmodifiedSizeProperties = false,
                 InstanceMonitoring = Monitoring.BASIC,
                 KeyName = "keyName",
                 MaxCapacity = 123,
                 MaxInstanceLifetime = Duration.Minutes(30),
                 MinCapacity = 123,
                 NewInstancesProtectedFromScaleIn = false,
                 Notifications = new [] { new NotificationConfiguration {
                     Topic = topic,

                     // the properties below are optional
                     ScalingEvents = scalingEvents
                 } },
                 NotificationsTopic = topic,
                 ReplacingUpdateMinSuccessfulInstancesPercent = 123,
                 ResourceSignalCount = 123,
                 ResourceSignalTimeout = Duration.Minutes(30),
                 RollingUpdateConfiguration = new RollingUpdateConfiguration {
                     MaxBatchSize = 123,
                     MinInstancesInService = 123,
                     MinSuccessfulInstancesPercent = 123,
                     PauseTime = Duration.Minutes(30),
                     SuspendProcesses = new [] { ScalingProcess.LAUNCH },
                     WaitOnResourceSignals = false
                 },
                 Signals = signals,
                 SpotPrice = "spotPrice",
                 TerminationPolicies = new [] { TerminationPolicy.ALLOCATION_STRATEGY },
                 UpdatePolicy = updatePolicy,
                 UpdateType = UpdateType.NONE,
                 VpcSubnets = new SubnetSelection {
                     AvailabilityZones = new [] { "availabilityZones" },
                     OnePerAz = false,
                     SubnetFilters = new [] { subnetFilter },
                     SubnetGroupName = "subnetGroupName",
                     SubnetName = "subnetName",
                     Subnets = new [] { subnet },
                     SubnetType = SubnetType.ISOLATED
                 }
             };

Remarks

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

ExampleMetadata: fixture=_generated

Constructors

CommonAutoScalingGroupProps() 

public CommonAutoScalingGroupProps()

Properties

AllowAllOutbound

Whether the instances can initiate connections to anywhere by default.

public bool? AllowAllOutbound { get; set; }

Property Value

bool?

Remarks

Default: true

AssociatePublicIpAddress

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

public bool? AssociatePublicIpAddress { get; set; }

Property Value

bool?

Remarks

Default: - Use subnet setting.

AutoScalingGroupName

The name of the Auto Scaling group.

public string? AutoScalingGroupName { get; set; }

Property Value

string

Remarks

This name must be unique per Region per account.

Default: - Auto generated by CloudFormation

BlockDevices

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

public IBlockDevice[]? BlockDevices { get; set; }

Property Value

IBlockDevice[]

Remarks

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

Cooldown

Default scaling cooldown for this AutoScalingGroup.

public Duration? Cooldown { get; set; }

Property Value

Duration

Remarks

Default: Duration.minutes(5)

DesiredCapacity

Initial amount of instances in the fleet.

public double? DesiredCapacity { get; set; }

Property Value

double?

Remarks

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

GroupMetrics

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

public GroupMetrics[]? GroupMetrics { get; set; }

Property Value

GroupMetrics[]

Remarks

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

HealthCheck

Configuration for health checks.

public HealthCheck? HealthCheck { get; set; }

Property Value

HealthCheck

Remarks

Default: - HealthCheck.ec2 with no grace period

IgnoreUnmodifiedSizeProperties

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

public bool? IgnoreUnmodifiedSizeProperties { get; set; }

Property Value

bool?

Remarks

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

InstanceMonitoring

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

public Monitoring? InstanceMonitoring { get; set; }

Property Value

Monitoring?

Remarks

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

KeyName

Name of SSH keypair to grant access to instances.

public string? KeyName { get; set; }

Property Value

string

Remarks

Default: - No SSH access will be possible.

MaxCapacity

Maximum number of instances in the fleet.

public double? MaxCapacity { get; set; }

Property Value

double?

Remarks

Default: desiredCapacity

MaxInstanceLifetime

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

public Duration? MaxInstanceLifetime { get; set; }

Property Value

Duration

Remarks

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

MinCapacity

Minimum number of instances in the fleet.

public double? MinCapacity { get; set; }

Property Value

double?

Remarks

Default: 1

NewInstancesProtectedFromScaleIn

Whether newly-launched instances are protected from termination by Amazon EC2 Auto Scaling when scaling in.

public bool? NewInstancesProtectedFromScaleIn { get; set; }

Property Value

bool?

Remarks

By default, Auto Scaling can terminate an instance at any time after launch when scaling in an Auto Scaling Group, subject to the group's termination policy. However, you may wish to protect newly-launched instances from being scaled in if they are going to run critical applications that should not be prematurely terminated.

This flag must be enabled if the Auto Scaling Group will be associated with an ECS Capacity Provider with managed termination protection.

Default: false

Notifications

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

public INotificationConfiguration[]? Notifications { get; set; }

Property Value

INotificationConfiguration[]

Remarks

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

NotificationsTopic

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

[Obsolete("use `notifications`")]
public ITopic? NotificationsTopic { get; set; }

Property Value

ITopic

Remarks

Default: - No fleet change notifications will be sent.

Stability: Deprecated

ReplacingUpdateMinSuccessfulInstancesPercent

(deprecated) Configuration for replacing updates.

[Obsolete("Use `signals` instead")]
public double? ReplacingUpdateMinSuccessfulInstancesPercent { get; set; }

Property Value

double?

Remarks

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

Default: minSuccessfulInstancesPercent

Stability: Deprecated

ResourceSignalCount

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

[Obsolete("Use `signals` instead.")]
public double? ResourceSignalCount { get; set; }

Property Value

double?

Remarks

Default: 1 if resourceSignalTimeout is set, 0 otherwise

Stability: Deprecated

ResourceSignalTimeout

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

[Obsolete("Use `signals` instead.")]
public Duration? ResourceSignalTimeout { get; set; }

Property Value

Duration

Remarks

The maximum value is 43200 (12 hours).

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

Stability: Deprecated

RollingUpdateConfiguration

(deprecated) Configuration for rolling updates.

[Obsolete("Use `updatePolicy` instead")]
public IRollingUpdateConfiguration? RollingUpdateConfiguration { get; set; }

Property Value

IRollingUpdateConfiguration

Remarks

Only used if updateType == UpdateType.RollingUpdate.

Default: - RollingUpdateConfiguration with defaults.

Stability: Deprecated

Signals

Configure waiting for signals during deployment.

public Signals? Signals { get; set; }

Property Value

Signals

Remarks

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

SpotPrice

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

public string? SpotPrice { get; set; }

Property Value

string

Remarks

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

Default: none

TerminationPolicies

A policy or a list of policies that are used to select the instances to terminate.

public TerminationPolicy[]? TerminationPolicies { get; set; }

Property Value

TerminationPolicy[]

Remarks

The policies are executed in the order that you list them.

Default: - TerminationPolicy.DEFAULT

See: https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-instance-termination.html

UpdatePolicy

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

public UpdatePolicy? UpdatePolicy { get; set; }

Property Value

UpdatePolicy

Remarks

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

UpdateType

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

[Obsolete("Use `updatePolicy` instead")]
public UpdateType? UpdateType { get; set; }

Property Value

UpdateType?

Remarks

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

Stability: Deprecated

VpcSubnets

Where to place instances within the VPC.

public ISubnetSelection? VpcSubnets { get; set; }

Property Value

ISubnetSelection

Remarks

Default: - All Private subnets.