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[ aws . autoscaling ]



Removes one or more instances from the specified Auto Scaling group.

After the instances are detached, you can manage them independent of the Auto Scaling group.

If you do not specify the option to decrement the desired capacity, Amazon EC2 Auto Scaling launches instances to replace the ones that are detached.

If there is a Classic Load Balancer attached to the Auto Scaling group, the instances are deregistered from the load balancer. If there are target groups attached to the Auto Scaling group, the instances are deregistered from the target groups.

For more information, see Detach or attach instances in the Amazon EC2 Auto Scaling User Guide .

See also: AWS API Documentation


[--instance-ids <value>]
--auto-scaling-group-name <value>
--should-decrement-desired-capacity | --no-should-decrement-desired-capacity
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]
[--endpoint-url <value>]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]


--instance-ids (list)

The IDs of the instances. You can specify up to 20 instances.



"string" "string" ...

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

The name of the Auto Scaling group.

--should-decrement-desired-capacity | --no-should-decrement-desired-capacity (boolean)

Indicates whether the Auto Scaling group decrements the desired capacity value by the number of instances detached.

--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.

Global Options

--debug (boolean)

Turn on debug logging.

--endpoint-url (string)

Override command's default URL with the given URL.

--no-verify-ssl (boolean)

By default, the AWS CLI uses SSL when communicating with AWS services. For each SSL connection, the AWS CLI will verify SSL certificates. This option overrides the default behavior of verifying SSL certificates.

--no-paginate (boolean)

Disable automatic pagination.

--output (string)

The formatting style for command output.

  • json
  • text
  • table

--query (string)

A JMESPath query to use in filtering the response data.

--profile (string)

Use a specific profile from your credential file.

--region (string)

The region to use. Overrides config/env settings.

--version (string)

Display the version of this tool.

--color (string)

Turn on/off color output.

  • on
  • off
  • auto

--no-sign-request (boolean)

Do not sign requests. Credentials will not be loaded if this argument is provided.

--ca-bundle (string)

The CA certificate bundle to use when verifying SSL certificates. Overrides config/env settings.

--cli-read-timeout (int)

The maximum socket read time in seconds. If the value is set to 0, the socket read will be blocking and not timeout. The default value is 60 seconds.

--cli-connect-timeout (int)

The maximum socket connect time in seconds. If the value is set to 0, the socket connect will be blocking and not timeout. The default value is 60 seconds.



To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal's quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

To detach an instance from an Auto Scaling group

This example detaches the specified instance from the specified Auto Scaling group.

aws autoscaling detach-instances \
    --instance-ids i-030017cfa84b20135 \
    --auto-scaling-group-name my-asg \


    "Activities": [
            "ActivityId": "5091cb52-547a-47ce-a236-c9ccbc2cb2c9",
            "AutoScalingGroupName": "my-asg",
            "Description": "Detaching EC2 instance: i-030017cfa84b20135",
            "Cause": "At 2020-10-31T17:35:04Z instance i-030017cfa84b20135 was detached in response to a user request, shrinking the capacity from 2 to 1.",
            "StartTime": "2020-04-12T15:02:16.179Z",
            "StatusCode": "InProgress",
            "Progress": 50,
            "Details": "{\"Subnet ID\":\"subnet-6194ea3b\",\"Availability Zone\":\"us-west-2c\"}"


Activities -> (list)

The activities related to detaching the instances from the Auto Scaling group.


Describes scaling activity, which is a long-running process that represents a change to your Auto Scaling group, such as changing its size or replacing an instance.

ActivityId -> (string)

The ID of the activity.

AutoScalingGroupName -> (string)

The name of the Auto Scaling group.

Description -> (string)

A friendly, more verbose description of the activity.

Cause -> (string)

The reason the activity began.

StartTime -> (timestamp)

The start time of the activity.

EndTime -> (timestamp)

The end time of the activity.

StatusCode -> (string)

The current status of the activity.

StatusMessage -> (string)

A friendly, more verbose description of the activity status.

Progress -> (integer)

A value between 0 and 100 that indicates the progress of the activity.

Details -> (string)

The details about the activity.

AutoScalingGroupState -> (string)

The state of the Auto Scaling group, which is either InService or Deleted .

AutoScalingGroupARN -> (string)

The Amazon Resource Name (ARN) of the Auto Scaling group.