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[ aws . autoscaling ]

update-auto-scaling-group

Description

Updates the configuration for the specified Auto Scaling group.

To update an Auto Scaling group, specify the name of the group and the parameter that you want to change. Any parameters that you don't specify are not changed by this update request. The new settings take effect on any scaling activities after this call returns.

If you associate a new launch configuration or template with an Auto Scaling group, all new instances will get the updated configuration. Existing instances continue to run with the configuration that they were originally launched with. When you update a group to specify a mixed instances policy instead of a launch configuration or template, existing instances may be replaced to match the new purchasing options that you specified in the policy. For example, if the group currently has 100% On-Demand capacity and the policy specifies 50% Spot capacity, this means that half of your instances will be gradually terminated and relaunched as Spot Instances. When replacing instances, Amazon EC2 Auto Scaling launches new instances before terminating the old ones, so that updating your group does not compromise the performance or availability of your application.

Note the following about changing DesiredCapacity , MaxSize , or MinSize :

  • If a scale-in activity occurs as a result of a new DesiredCapacity value that is lower than the current size of the group, the Auto Scaling group uses its termination policy to determine which instances to terminate.
  • If you specify a new value for MinSize without specifying a value for DesiredCapacity , and the new MinSize is larger than the current size of the group, this sets the group's DesiredCapacity to the new MinSize value.
  • If you specify a new value for MaxSize without specifying a value for DesiredCapacity , and the new MaxSize is smaller than the current size of the group, this sets the group's DesiredCapacity to the new MaxSize value.

To see which parameters have been set, call the DescribeAutoScalingGroups API. To view the scaling policies for an Auto Scaling group, call the DescribePolicies API. If the group has scaling policies, you can update them by calling the PutScalingPolicy API.

See also: AWS API Documentation

See 'aws help' for descriptions of global parameters.

Synopsis

  update-auto-scaling-group
--auto-scaling-group-name <value>
[--launch-configuration-name <value>]
[--launch-template <value>]
[--mixed-instances-policy <value>]
[--min-size <value>]
[--max-size <value>]
[--desired-capacity <value>]
[--default-cooldown <value>]
[--availability-zones <value>]
[--health-check-type <value>]
[--health-check-grace-period <value>]
[--placement-group <value>]
[--vpc-zone-identifier <value>]
[--termination-policies <value>]
[--new-instances-protected-from-scale-in | --no-new-instances-protected-from-scale-in]
[--service-linked-role-arn <value>]
[--max-instance-lifetime <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Options

--auto-scaling-group-name (string)

The name of the Auto Scaling group.

--launch-configuration-name (string)

The name of the launch configuration. If you specify LaunchConfigurationName in your update request, you can't specify LaunchTemplate or MixedInstancesPolicy .

--launch-template (structure)

The launch template and version to use to specify the updates. If you specify LaunchTemplate in your update request, you can't specify LaunchConfigurationName or MixedInstancesPolicy .

For more information, see LaunchTemplateSpecification in the Amazon EC2 Auto Scaling API Reference .

LaunchTemplateId -> (string)

The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.

You must specify either a template ID or a template name.

LaunchTemplateName -> (string)

The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.

You must specify either a template ID or a template name.

Version -> (string)

The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API.

If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .

Shorthand Syntax:

LaunchTemplateId=string,LaunchTemplateName=string,Version=string

JSON Syntax:

{
  "LaunchTemplateId": "string",
  "LaunchTemplateName": "string",
  "Version": "string"
}

--mixed-instances-policy (structure)

An embedded object that specifies a mixed instances policy.

In your call to UpdateAutoScalingGroup , you can make changes to the policy that is specified. All optional parameters are left unchanged if not specified.

For more information, see MixedInstancesPolicy in the Amazon EC2 Auto Scaling API Reference and Auto Scaling Groups with Multiple Instance Types and Purchase Options in the Amazon EC2 Auto Scaling User Guide .

LaunchTemplate -> (structure)

The launch template and instance types (overrides).

Required when creating a mixed instances policy.

LaunchTemplateSpecification -> (structure)

The launch template to use. You must specify either the launch template ID or launch template name in the request.

LaunchTemplateId -> (string)

The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.

You must specify either a template ID or a template name.

LaunchTemplateName -> (string)

The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.

You must specify either a template ID or a template name.

Version -> (string)

The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API.

If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .

Overrides -> (list)

Any parameters that you specify override the same parameters in the launch template. Currently, the only supported override is instance type. You can specify between 1 and 20 instance types.

If not provided, Amazon EC2 Auto Scaling will use the instance type specified in the launch template to launch instances.

(structure)

Describes an override for a launch template. Currently, the only supported override is instance type.

The maximum number of instance type overrides that can be associated with an Auto Scaling group is 20.

InstanceType -> (string)

The instance type. You must use an instance type that is supported in your requested Region and Availability Zones.

For information about available instance types, see Available Instance Types in the Amazon Elastic Compute Cloud User Guide.

WeightedCapacity -> (string)

The number of capacity units, which gives the instance type a proportional weight to other instance types. For example, larger instance types are generally weighted more than smaller instance types. These are the same units that you chose to set the desired capacity in terms of instances, or a performance attribute such as vCPUs, memory, or I/O.

For more information, see Instance Weighting for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide .

Valid Range: Minimum value of 1. Maximum value of 999.

InstancesDistribution -> (structure)

The instances distribution to use.

If you leave this parameter unspecified, the value for each parameter in InstancesDistribution uses a default value.

OnDemandAllocationStrategy -> (string)

Indicates how to allocate instance types to fulfill On-Demand capacity.

The only valid value is prioritized , which is also the default value. This strategy uses the order of instance type overrides for the LaunchTemplate to define the launch priority of each instance type. The first instance type in the array is prioritized higher than the last. If all your On-Demand capacity cannot be fulfilled using your highest priority instance, then the Auto Scaling groups launches the remaining capacity using the second priority instance type, and so on.

OnDemandBaseCapacity -> (integer)

The minimum amount of the Auto Scaling group's capacity that must be fulfilled by On-Demand Instances. This base portion is provisioned first as your group scales.

Default if not set is 0. If you leave it set to 0, On-Demand Instances are launched as a percentage of the Auto Scaling group's desired capacity, per the OnDemandPercentageAboveBaseCapacity setting.

Note

An update to this setting means a gradual replacement of instances to maintain the specified number of On-Demand Instances for your base capacity. When replacing instances, Amazon EC2 Auto Scaling launches new instances before terminating the old ones.

OnDemandPercentageAboveBaseCapacity -> (integer)

Controls the percentages of On-Demand Instances and Spot Instances for your additional capacity beyond OnDemandBaseCapacity .

Default if not set is 100. If you leave it set to 100, the percentages are 100% for On-Demand Instances and 0% for Spot Instances.

Note

An update to this setting means a gradual replacement of instances to maintain the percentage of On-Demand Instances for your additional capacity above the base capacity. When replacing instances, Amazon EC2 Auto Scaling launches new instances before terminating the old ones.

Valid Range: Minimum value of 0. Maximum value of 100.

SpotAllocationStrategy -> (string)

Indicates how to allocate instances across Spot Instance pools.

If the allocation strategy is lowest-price , the Auto Scaling group launches instances using the Spot pools with the lowest price, and evenly allocates your instances across the number of Spot pools that you specify. If the allocation strategy is capacity-optimized , the Auto Scaling group launches instances using Spot pools that are optimally chosen based on the available Spot capacity.

The default Spot allocation strategy for calls that you make through the API, the AWS CLI, or the AWS SDKs is lowest-price . The default Spot allocation strategy for the AWS Management Console is capacity-optimized .

Valid values: lowest-price | capacity-optimized

SpotInstancePools -> (integer)

The number of Spot Instance pools across which to allocate your Spot Instances. The Spot pools are determined from the different instance types in the Overrides array of LaunchTemplate . Default if not set is 2.

Used only when the Spot allocation strategy is lowest-price .

Valid Range: Minimum value of 1. Maximum value of 20.

SpotMaxPrice -> (string)

The maximum price per unit hour that you are willing to pay for a Spot Instance. If you leave the value of this parameter blank (which is the default), the maximum Spot price is set at the On-Demand price.

To remove a value that you previously set, include the parameter but leave the value blank.

JSON Syntax:

{
  "LaunchTemplate": {
    "LaunchTemplateSpecification": {
      "LaunchTemplateId": "string",
      "LaunchTemplateName": "string",
      "Version": "string"
    },
    "Overrides": [
      {
        "InstanceType": "string",
        "WeightedCapacity": "string"
      }
      ...
    ]
  },
  "InstancesDistribution": {
    "OnDemandAllocationStrategy": "string",
    "OnDemandBaseCapacity": integer,
    "OnDemandPercentageAboveBaseCapacity": integer,
    "SpotAllocationStrategy": "string",
    "SpotInstancePools": integer,
    "SpotMaxPrice": "string"
  }
}

--min-size (integer)

The minimum size of the Auto Scaling group.

--max-size (integer)

The maximum size of the Auto Scaling group.

Note

With a mixed instances policy that uses instance weighting, Amazon EC2 Auto Scaling may need to go above MaxSize to meet your capacity requirements. In this event, Amazon EC2 Auto Scaling will never go above MaxSize by more than your largest instance weight (weights that define how many units each instance contributes to the desired capacity of the group).

--desired-capacity (integer)

The desired capacity is the initial capacity of the Auto Scaling group after this operation completes and the capacity it attempts to maintain.

This number must be greater than or equal to the minimum size of the group and less than or equal to the maximum size of the group.

--default-cooldown (integer)

The amount of time, in seconds, after a scaling activity completes before another scaling activity can start. The default value is 300 .

This setting applies when using simple scaling policies, but not when using other scaling policies or scheduled scaling. For more information, see Scaling Cooldowns for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide .

--availability-zones (list)

One or more Availability Zones for the group.

(string)

Syntax:

"string" "string" ...

--health-check-type (string)

The service to use for the health checks. The valid values are EC2 and ELB . If you configure an Auto Scaling group to use ELB health checks, it considers the instance unhealthy if it fails either the EC2 status checks or the load balancer health checks.

--health-check-grace-period (integer)

The amount of time, in seconds, that Amazon EC2 Auto Scaling waits before checking the health status of an EC2 instance that has come into service. The default value is 0 .

For more information, see Health Check Grace Period in the Amazon EC2 Auto Scaling User Guide .

Required if you are adding an ELB health check.

--placement-group (string)

The name of the placement group into which to launch your instances, if any. A placement group is a logical grouping of instances within a single Availability Zone. You cannot specify multiple Availability Zones and a placement group. For more information, see Placement Groups in the Amazon EC2 User Guide for Linux Instances .

--vpc-zone-identifier (string)

A comma-separated list of subnet IDs for virtual private cloud (VPC).

If you specify VPCZoneIdentifier with AvailabilityZones , the subnets that you specify for this parameter must reside in those Availability Zones.

--termination-policies (list)

A standalone termination policy or a list of termination policies used to select the instance to terminate. The policies are executed in the order that they are listed.

For more information, see Controlling Which Instances Auto Scaling Terminates During Scale In in the Amazon EC2 Auto Scaling User Guide .

(string)

Syntax:

"string" "string" ...

--new-instances-protected-from-scale-in | --no-new-instances-protected-from-scale-in (boolean)

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

For more information about preventing instances from terminating on scale in, see Instance Protection in the Amazon EC2 Auto Scaling User Guide .

--service-linked-role-arn (string)

The Amazon Resource Name (ARN) of the service-linked role that the Auto Scaling group uses to call other AWS services on your behalf. For more information, see Service-Linked Roles in the Amazon EC2 Auto Scaling User Guide .

--max-instance-lifetime (integer)

The maximum amount of time, in seconds, that an instance can be in service. The default is null.

This parameter is optional, but if you specify a value for it, you must specify a value of at least 604,800 seconds (7 days). To clear a previously set value, specify a new value of 0.

For more information, see Replacing Auto Scaling Instances Based on Maximum Instance Lifetime in the Amazon EC2 Auto Scaling User Guide .

Valid Range: Minimum value of 0.

--cli-input-json (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See 'aws help' for descriptions of global parameters.

Examples

To update an Auto Scaling group

This example updates the specified Auto Scaling group to use Elastic Load Balancing health checks:

aws autoscaling update-auto-scaling-group --auto-scaling-group-name my-auto-scaling-group --health-check-type ELB --health-check-grace-period 60

This example updates the launch configuration, minimum and maximum size of the group, and which subnet to use:

aws autoscaling update-auto-scaling-group --auto-scaling-group-name my-auto-scaling-group --launch-configuration-name new-launch-config --min-size 1 --max-size 3 --vpc-zone-identifier subnet-41767929

This example updates the desired capacity, default cooldown, placement group, termination policy, and which Availability Zone to use:

aws autoscaling update-auto-scaling-group --auto-scaling-group-name my-auto-scaling-group --default-cooldown 600 --placement-group my-placement-group --termination-policies "OldestInstance" --availability-zones us-west-2c

This example enables the instance protection setting for the specified Auto Scaling group:

aws autoscaling update-auto-scaling-group --auto-scaling-group-name my-auto-scaling-group --new-instances-protected-from-scale-in

This example disables the instance protection setting for the specified Auto Scaling group:

aws autoscaling update-auto-scaling-group --auto-scaling-group-name my-auto-scaling-group --no-new-instances-protected-from-scale-in

Output

None