Class AutoScalingGroupProps
Properties of a Fleet.
Inheritance
Namespace: Amazon.CDK.AWS.AutoScaling
Assembly: Amazon.CDK.AWS.AutoScaling.dll
Syntax (csharp)
public class AutoScalingGroupProps : Object, IAutoScalingGroupProps, ICommonAutoScalingGroupProps
Syntax (vb)
Public Class AutoScalingGroupProps
Inherits Object
Implements IAutoScalingGroupProps, ICommonAutoScalingGroupProps
Remarks
ExampleMetadata: infused
Examples
Vpc vpc;
var mySecurityGroup = new SecurityGroup(this, "SecurityGroup", new SecurityGroupProps { Vpc = vpc });
new AutoScalingGroup(this, "ASG", new AutoScalingGroupProps {
Vpc = vpc,
InstanceType = InstanceType.Of(InstanceClass.BURSTABLE2, InstanceSize.MICRO),
MachineImage = new AmazonLinuxImage(),
SecurityGroup = mySecurityGroup
});
Synopsis
Constructors
AutoScalingGroupProps() |
Properties
AllowAllOutbound | Whether the instances can initiate connections to anywhere by default. |
AssociatePublicIpAddress | Whether instances in the Auto Scaling Group should have public IP addresses associated with them. |
AutoScalingGroupName | The name of the Auto Scaling group. |
BlockDevices | Specifies how block devices are exposed to the instance. You can specify virtual devices and EBS volumes. |
Cooldown | Default scaling cooldown for this AutoScalingGroup. |
DesiredCapacity | Initial amount of instances in the fleet. |
GroupMetrics | Enable monitoring for group metrics, these metrics describe the group rather than any of its instances. |
HealthCheck | Configuration for health checks. |
IgnoreUnmodifiedSizeProperties | If the ASG has scheduled actions, don't reset unchanged group sizes. |
Init | Apply the given CloudFormation Init configuration to the instances in the AutoScalingGroup at startup. |
InitOptions | Use the given options for applying CloudFormation Init. |
InstanceMonitoring | Controls whether instances in this group are launched with detailed or basic monitoring. |
InstanceType | Type of instance to launch. |
KeyName | Name of SSH keypair to grant access to instances. |
LaunchTemplate | Launch template to use. |
MachineImage | AMI to launch. |
MaxCapacity | Maximum number of instances in the fleet. |
MaxInstanceLifetime | The maximum amount of time that an instance can be in service. |
MinCapacity | Minimum number of instances in the fleet. |
MixedInstancesPolicy | Mixed Instances Policy to use. |
NewInstancesProtectedFromScaleIn | Whether newly-launched instances are protected from termination by Amazon EC2 Auto Scaling when scaling in. |
Notifications | Configure autoscaling group to send notifications about fleet changes to an SNS topic(s). |
NotificationsTopic | (deprecated) SNS topic to send notifications about fleet changes. |
ReplacingUpdateMinSuccessfulInstancesPercent | (deprecated) Configuration for replacing updates. |
RequireImdsv2 | Whether IMDSv2 should be required on launched instances. |
ResourceSignalCount | (deprecated) How many ResourceSignal calls CloudFormation expects before the resource is considered created. |
ResourceSignalTimeout | (deprecated) The length of time to wait for the resourceSignalCount. |
Role | An IAM role to associate with the instance profile assigned to this Auto Scaling Group. |
RollingUpdateConfiguration | (deprecated) Configuration for rolling updates. |
SecurityGroup | Security group to launch the instances in. |
Signals | Configure waiting for signals during deployment. |
SpotPrice | The maximum hourly price (in USD) to be paid for any Spot Instance launched to fulfill the request. |
TerminationPolicies | A policy or a list of policies that are used to select the instances to terminate. |
UpdatePolicy | What to do when an AutoScalingGroup's instance configuration is changed. |
UpdateType | (deprecated) What to do when an AutoScalingGroup's instance configuration is changed. |
UserData | Specific UserData to use. |
Vpc | VPC to launch these instances in. |
VpcSubnets | Where to place instances within the VPC. |
Constructors
AutoScalingGroupProps()
public AutoScalingGroupProps()
Properties
AllowAllOutbound
Whether the instances can initiate connections to anywhere by default.
public Nullable<bool> AllowAllOutbound { get; set; }
Property Value
System.Nullable<System.Boolean>
Remarks
Default: true
AssociatePublicIpAddress
Whether instances in the Auto Scaling Group should have public IP addresses associated with them.
public Nullable<bool> AssociatePublicIpAddress { get; set; }
Property Value
System.Nullable<System.Boolean>
Remarks
Default: - Use subnet setting.
AutoScalingGroupName
The name of the Auto Scaling group.
public string AutoScalingGroupName { get; set; }
Property Value
System.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
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
Remarks
Default: Duration.minutes(5)
DesiredCapacity
Initial amount of instances in the fleet.
public Nullable<double> DesiredCapacity { get; set; }
Property Value
System.Nullable<System.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
GroupMetrics
Enable monitoring for group metrics, these metrics describe the group rather than any of its instances.
public GroupMetrics[] GroupMetrics { get; set; }
Property Value
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
Remarks
Default: - HealthCheck.ec2 with no grace period
IgnoreUnmodifiedSizeProperties
If the ASG has scheduled actions, don't reset unchanged group sizes.
public Nullable<bool> IgnoreUnmodifiedSizeProperties { get; set; }
Property Value
System.Nullable<System.Boolean>
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
Init
Apply the given CloudFormation Init configuration to the instances in the AutoScalingGroup at startup.
public CloudFormationInit Init { get; set; }
Property Value
Remarks
If you specify init
, you must also specify signals
to configure
the number of instances to wait for and the timeout for waiting for the
init process.
Default: - no CloudFormation init
InitOptions
Use the given options for applying CloudFormation Init.
public IApplyCloudFormationInitOptions InitOptions { get; set; }
Property Value
IApplyCloudFormationInitOptions
Remarks
Describes the configsets to use and the timeout to wait
Default: - default options
InstanceMonitoring
Controls whether instances in this group are launched with detailed or basic monitoring.
public Nullable<Monitoring> InstanceMonitoring { get; set; }
Property Value
System.Nullable<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
InstanceType
Type of instance to launch.
public InstanceType InstanceType { get; set; }
Property Value
Remarks
launchTemplate
must not be specified when this property is specified.
Default: - Do not provide any instance type
KeyName
Name of SSH keypair to grant access to instances.
public string KeyName { get; set; }
Property Value
System.String
Remarks
Default: - No SSH access will be possible.
LaunchTemplate
Launch template to use.
public ILaunchTemplate LaunchTemplate { get; set; }
Property Value
Remarks
Launch configuration related settings and MixedInstancesPolicy must not be specified when a launch template is specified.
Default: - Do not provide any launch template
MachineImage
AMI to launch.
public IMachineImage MachineImage { get; set; }
Property Value
Remarks
launchTemplate
must not be specified when this property is specified.
Default: - Do not provide any machine image
MaxCapacity
Maximum number of instances in the fleet.
public Nullable<double> MaxCapacity { get; set; }
Property Value
System.Nullable<System.Double>
Remarks
Default: desiredCapacity
MaxInstanceLifetime
The maximum amount of time that an instance can be in service.
public Duration MaxInstanceLifetime { get; set; }
Property Value
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 Nullable<double> MinCapacity { get; set; }
Property Value
System.Nullable<System.Double>
Remarks
Default: 1
MixedInstancesPolicy
Mixed Instances Policy to use.
public IMixedInstancesPolicy MixedInstancesPolicy { get; set; }
Property Value
Remarks
Launch configuration related settings and Launch Template must not be specified when a MixedInstancesPolicy is specified.
Default: - Do not provide any MixedInstancesPolicy
NewInstancesProtectedFromScaleIn
Whether newly-launched instances are protected from termination by Amazon EC2 Auto Scaling when scaling in.
public Nullable<bool> NewInstancesProtectedFromScaleIn { get; set; }
Property Value
System.Nullable<System.Boolean>
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
Remarks
Default: - No fleet change notifications will be sent.
NotificationsTopic
(deprecated) SNS topic to send notifications about fleet changes.
public ITopic NotificationsTopic { get; set; }
Property Value
Remarks
Default: - No fleet change notifications will be sent.
Stability: Deprecated
ReplacingUpdateMinSuccessfulInstancesPercent
(deprecated) Configuration for replacing updates.
public Nullable<double> ReplacingUpdateMinSuccessfulInstancesPercent { get; set; }
Property Value
System.Nullable<System.Double>
Remarks
Only used if updateType == UpdateType.ReplacingUpdate. Specifies how many instances must signal success for the update to succeed.
Default: minSuccessfulInstancesPercent
Stability: Deprecated
RequireImdsv2
Whether IMDSv2 should be required on launched instances.
public Nullable<bool> RequireImdsv2 { get; set; }
Property Value
System.Nullable<System.Boolean>
Remarks
Default: false
ResourceSignalCount
(deprecated) How many ResourceSignal calls CloudFormation expects before the resource is considered created.
public Nullable<double> ResourceSignalCount { get; set; }
Property Value
System.Nullable<System.Double>
Remarks
Default: 1 if resourceSignalTimeout is set, 0 otherwise
Stability: Deprecated
ResourceSignalTimeout
(deprecated) The length of time to wait for the resourceSignalCount.
public Duration ResourceSignalTimeout { get; set; }
Property Value
Remarks
The maximum value is 43200 (12 hours).
Default: Duration.minutes(5) if resourceSignalCount is set, N/A otherwise
Stability: Deprecated
Role
An IAM role to associate with the instance profile assigned to this Auto Scaling Group.
public IRole Role { get; set; }
Property Value
Remarks
The role must be assumable by the service principal ec2.amazonaws.com
:
launchTemplate
must not be specified when this property is specified.
Default: A role will automatically be created, it can be accessed via the role
property
Examples
var role = new Role(this, "MyRole", new RoleProps {
AssumedBy = new ServicePrincipal("ec2.amazonaws.com")
});
RollingUpdateConfiguration
(deprecated) Configuration for rolling updates.
public IRollingUpdateConfiguration RollingUpdateConfiguration { get; set; }
Property Value
Remarks
Only used if updateType == UpdateType.RollingUpdate.
Default: - RollingUpdateConfiguration with defaults.
Stability: Deprecated
SecurityGroup
Security group to launch the instances in.
public ISecurityGroup SecurityGroup { get; set; }
Property Value
Remarks
launchTemplate
must not be specified when this property is specified.
Default: - A SecurityGroup will be created if none is specified.
Signals
Configure waiting for signals during deployment.
public Signals Signals { get; set; }
Property Value
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:
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
System.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
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
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.
public Nullable<UpdateType> UpdateType { get; set; }
Property Value
System.Nullable<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
UserData
Specific UserData to use.
public UserData UserData { get; set; }
Property Value
Remarks
The UserData may still be mutated after creation.
launchTemplate
must not be specified when this property is specified.
Default: - A UserData object appropriate for the MachineImage's Operating System is created.
Vpc
VpcSubnets
Where to place instances within the VPC.
public ISubnetSelection VpcSubnets { get; set; }
Property Value
Remarks
Default: - All Private subnets.