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# AmazonChangeEc2InstancesParameters Object

## Description

Parameters for the Amazon Change EC2 Instances action.

## Properties

### credentialIds

Registered credentials to use with the action. One and only one credential must be specified.

Type: Array of `string`

Required: Yes

### deregisterFromLoadBalancers

Indicates whether to deregister from load balancers when stopping the EC2 instance.

Type: `string`

Valid Values:

* `none`
* `all-load-balancers`

Required: Yes

### instanceIds

Instance IDs of the EC2 instances which will be changed. Required when `instanceIdentificationMethod` is `by-instance-id`.

Type: Array of `string`

Required: Conditional

### instanceNameComparison

Comparison to use when identifying EC2 instances by `Name` tag. Required when `instanceIdentificationMethod` is `by-instance-name-tag`.

Type: [InstanceNameComparison](/data-types/instancenamecomparison-object-1.md) object.

Required: Conditional

### instanceIdentificationMethod

Method of identifying the EC2 instances.

Type: `string`

Valid Values:

* `all-instances`
* `by-instance-id`
* `by-instance-name-tag`
* `by-resource-tag`

Required: Yes

### instanceType

New instance type for the EC2 instances.

Type: `string`

Required: No

### isEbsOptimized

New flag indicating whether the EC2 instances are EBS-optimized or not.

Type: `boolean`

Required: No

### isEnableTerminationProtection

New flag indicating whether the EC2 instances should have termination protection enabled.

Type: `boolean`

Required: No

### regionNames

Regions to use with the action. One and only one region must be specified.

Type: Array of `string`

Required: Yes

### resourceTagComparison

Comparison to use when identifying instances by resource tag. Required when `instanceIdentificationMethod` is `by-resource-tag`.

Type: [ResourceTagComparison](/data-types/resourcetagcomparison-object-1.md) object.

Required: Conditional

### revertTimeInSeconds

Time (in seconds) after which the EC2 instances will be reverted to their original settings.

Type: `integer`

Required: No

## Sample JSON

```javascript
{
    "credentialIds": [
        "cred-00000001"
    ],
    "regionNames": [
        "us-east-1"
    ],
    "instanceIdentificationMethod": "by-instance-id",
    "instanceIds": [
        "i-11111111",
        "i-22222222"
    ],

    "instanceType": "t2.small",
    "isEbsOptimized": false,

    "revertTimeInSeconds": 43200
}
```