This is the new *CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [AWS CloudFormation User Guide](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html).

# AWS::FIS::ExperimentTemplate ExperimentTemplateAction
<a name="aws-properties-fis-experimenttemplate-experimenttemplateaction"></a>

Specifies an action for an experiment template.

For more information, see [Actions](https://docs.aws.amazon.com/fis/latest/userguide/actions.html) in the *AWS Fault Injection Service User Guide*.

## Syntax
<a name="aws-properties-fis-experimenttemplate-experimenttemplateaction-syntax"></a>

To declare this entity in your CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-fis-experimenttemplate-experimenttemplateaction-syntax.json"></a>

```
{
  "[ActionId](#cfn-fis-experimenttemplate-experimenttemplateaction-actionid)" : String,
  "[Description](#cfn-fis-experimenttemplate-experimenttemplateaction-description)" : String,
  "[Parameters](#cfn-fis-experimenttemplate-experimenttemplateaction-parameters)" : {Key: Value, ...},
  "[StartAfter](#cfn-fis-experimenttemplate-experimenttemplateaction-startafter)" : [ String, ... ],
  "[Targets](#cfn-fis-experimenttemplate-experimenttemplateaction-targets)" : {Key: Value, ...}
}
```

### YAML
<a name="aws-properties-fis-experimenttemplate-experimenttemplateaction-syntax.yaml"></a>

```
  [ActionId](#cfn-fis-experimenttemplate-experimenttemplateaction-actionid): String
  [Description](#cfn-fis-experimenttemplate-experimenttemplateaction-description): String
  [Parameters](#cfn-fis-experimenttemplate-experimenttemplateaction-parameters): 
    Key: Value
  [StartAfter](#cfn-fis-experimenttemplate-experimenttemplateaction-startafter): 
    - String
  [Targets](#cfn-fis-experimenttemplate-experimenttemplateaction-targets): 
    Key: Value
```

## Properties
<a name="aws-properties-fis-experimenttemplate-experimenttemplateaction-properties"></a>

`ActionId`  <a name="cfn-fis-experimenttemplate-experimenttemplateaction-actionid"></a>
The ID of the action.  
*Required*: Yes  
*Type*: String  
*Maximum*: `64`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Description`  <a name="cfn-fis-experimenttemplate-experimenttemplateaction-description"></a>
A description for the action.  
*Required*: No  
*Type*: String  
*Maximum*: `512`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Parameters`  <a name="cfn-fis-experimenttemplate-experimenttemplateaction-parameters"></a>
The parameters for the action.  
*Required*: No  
*Type*: Object of String  
*Pattern*: `.{1,64}`  
*Maximum*: `1024`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`StartAfter`  <a name="cfn-fis-experimenttemplate-experimenttemplateaction-startafter"></a>
The name of the action that must be completed before the current action starts.  
*Required*: No  
*Type*: Array of String  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Targets`  <a name="cfn-fis-experimenttemplate-experimenttemplateaction-targets"></a>
The targets for the action.  
*Required*: No  
*Type*: Object of String  
*Pattern*: `.{1,64}`  
*Maximum*: `64`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)