modify-hosts¶

Description¶

Modify the auto-placement setting of a Dedicated Host. When auto-placement is enabled, any instances that you launch with a tenancy of host but without a specific host ID are placed onto any available Dedicated Host in your account that has auto-placement enabled. When auto-placement is disabled, you need to provide a host ID to have the instance launch onto a specific host. If no host ID is provided, the instance is launched onto a suitable host with auto-placement enabled.

You can also use this API action to modify a Dedicated Host to support either multiple instance types in an instance family, or to support a specific instance type only.

Synopsis¶

  modify-hosts
[--auto-placement <value>]
--host-ids <value>
[--host-recovery <value>]
[--instance-type <value>]
[--instance-family <value>]
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]

Options¶

--auto-placement (string)

Specify whether to enable or disable auto-placement.

Possible values:

on

off

--host-ids (list)

The IDs of the Dedicated Hosts to modify.

(string)

Syntax:

"string" "string" ...

--host-recovery (string)

Indicates whether to enable or disable host recovery for the Dedicated Host. For more information, see Host recovery in the Amazon EC2 User Guide .

Possible values:

on

off

--instance-type (string)

Specifies the instance type to be supported by the Dedicated Host. Specify this parameter to modify a Dedicated Host to support only a specific instance type.

If you want to modify a Dedicated Host to support multiple instance types in its current instance family, omit this parameter and specify InstanceFamily instead. You cannot specify InstanceType and InstanceFamily in the same request.

--instance-family (string)

Specifies the instance family to be supported by the Dedicated Host. Specify this parameter to modify a Dedicated Host to support multiple instance types within its current instance family.

If you want to modify a Dedicated Host to support a specific instance type only, omit this parameter and specify InstanceType instead. You cannot specify InstanceFamily and InstanceType in the same request.

--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. The generated JSON skeleton is not stable between versions of the AWS CLI and there are no backwards compatibility guarantees in the JSON skeleton generated.

See ‘aws help’ for descriptions of global parameters.

Examples¶

Note

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 .

Example 1: To enable auto-placement for a Dedicated Host

The following modify-hosts example enables auto-placement for a Dedicated Host so that it accepts any untargeted instance launches that match its instance type configuration.

aws ec2 modify-hosts \
    --host-id h-06c2f189b4EXAMPLE \
    --auto-placement on

Output:

{
    "Successful": [
        "h-06c2f189b4EXAMPLE"
    ],
    "Unsuccessful": []
}

Example 2: To enable host recovery for a Dedicated Host

The following modify-hosts example enables host recovery for the specified Dedicated Host.

aws ec2 modify-hosts \
    --host-id h-06c2f189b4EXAMPLE \
    --host-recovery on

Output:

{
    "Successful": [
        "h-06c2f189b4EXAMPLE"
    ],
    "Unsuccessful": []
}

For more information, see Modifying Dedicated Host Auto-Placement in the Amazon Elastic Compute Cloud User Guide for Linux Instances.

Output¶

Successful -> (list)

The IDs of the Dedicated Hosts that were successfully modified.

(string)

Unsuccessful -> (list)

The IDs of the Dedicated Hosts that could not be modified. Check whether the setting you requested can be used.

(structure)

Information about items that were not successfully processed in a batch call.

Error -> (structure)

Information about the error.

Code -> (string)

The error code.

Message -> (string)

The error message accompanying the error code.

ResourceId -> (string)

The ID of the resource.

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