# GoogleStartVmInstancesParameters Object

## Description

Parameters for the Google Start VM 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

### instanceNames

List of the names of the VM instance that are to be started.

Type: Array of `string`

Required: No

### instanceNameComparisons

List of comparisons to use when identifying VM instances by their name. Cannot be specified if `instanceNames` is specified.

Type: List of [GoogleInstanceNameComparison](/data-types/instancenamecomparison-object.md) object.

Required: No

### regionNames

Regions to use with the action. Omit or specify `null` to include "all regions".

Type: Array of `string`

Required: No

### labelComparisons

List of label comparisons to use when matching VM instances. Cannot be specified if `instanceNames` is specified.

Type: List of [GoogleLabelComparison](/data-types/resourcetagcomparison-object.md) objects.

Required: No

### stopTimeInSeconds

Time (in seconds) after which the VM instances will be stopped.

Type: `integer`

Required: No

## Matching Instances

The following fields are used to match VM Instances:

* instanceNames
* instanceNameComparisons
* labelComparisons

Omitting all of the above properties is equivalent to "All Instances".

Specifying only `instanceNames` is equivalent to "By Instance Name".

Specifying one or more of the `*Comparisons` properties is equivalent to "By Comparison Filter".

## Sample JSON

```javascript
{
    "credentialIds": [
        "cred-00000001"
    ],
    "regionNames": [
        "us-east-1"
    ],

    "instanceNames": [
        "instance1",
        "instance2"
    ],

    "stopTimeInSeconds": 43200
}
```


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