[ aws . ec2 ]



Modifies the default credit option for CPU usage of burstable performance instances. The default credit option is set at the account level per AWS Region, and is specified per instance family. All new burstable performance instances in the account launch using the default credit option.

ModifyDefaultCreditSpecification is an asynchronous operation, which works at an AWS Region level and modifies the credit option for each Availability Zone. All zones in a Region are updated within five minutes. But if instances are launched during this operation, they might not get the new credit option until the zone is updated. To verify whether the update has occurred, you can call GetDefaultCreditSpecification and check DefaultCreditSpecification for updates.

For more information, see Burstable performance instances in the Amazon EC2 User Guide .

See also: AWS API Documentation

See ‘aws help’ for descriptions of global parameters.


[--dry-run | --no-dry-run]
--instance-family <value>
--cpu-credits <value>
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]


--dry-run | --no-dry-run (boolean)

Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is DryRunOperation . Otherwise, it is UnauthorizedOperation .

--instance-family (string)

The instance family.

Possible values:

  • t2

  • t3

  • t3a

  • t4g

--cpu-credits (string)

The credit option for CPU usage of the instance family.

Valid Values: standard | unlimited

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those 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. This may not be specified along with --cli-input-yaml.

--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. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. 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.


To modify the default credit option

The following modify-default-credit-specification example modifies the default credit option for T2 instances.

aws ec2 modify-default-credit-specification \
    --instance-family t2 \
    --cpu-credits unlimited


    "InstanceFamilyCreditSpecification": {
        "InstanceFamily": "t2",
        "CpuCredits": "unlimited"


InstanceFamilyCreditSpecification -> (structure)

The default credit option for CPU usage of the instance family.

InstanceFamily -> (string)

The instance family.

CpuCredits -> (string)

The default credit option for CPU usage of the instance family. Valid values are standard and unlimited .