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# AWS::EC2::Instance SsmAssociation
<a name="aws-properties-ec2-instance-ssmassociation"></a>

Specifies the SSM document and parameter values in Amazon Systems Manager to associate with an instance.

`SsmAssociations` is a property of the [AWS::EC2::Instance](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-instance.html) resource. 

## Syntax
<a name="aws-properties-ec2-instance-ssmassociation-syntax"></a>

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

### JSON
<a name="aws-properties-ec2-instance-ssmassociation-syntax.json"></a>

```
{
  "[AssociationParameters](#cfn-ec2-instance-ssmassociation-associationparameters)" : {{[ AssociationParameter, ... ]}},
  "[DocumentName](#cfn-ec2-instance-ssmassociation-documentname)" : {{String}}
}
```

### YAML
<a name="aws-properties-ec2-instance-ssmassociation-syntax.yaml"></a>

```
  [AssociationParameters](#cfn-ec2-instance-ssmassociation-associationparameters): {{
    - AssociationParameter}}
  [DocumentName](#cfn-ec2-instance-ssmassociation-documentname): {{String}}
```

## Properties
<a name="aws-properties-ec2-instance-ssmassociation-properties"></a>

`AssociationParameters`  <a name="cfn-ec2-instance-ssmassociation-associationparameters"></a>
The input parameter values to use with the associated SSM document.  
*Required*: No  
*Type*: Array of [AssociationParameter](aws-properties-ec2-instance-associationparameter.md)  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`DocumentName`  <a name="cfn-ec2-instance-ssmassociation-documentname"></a>
The name of an SSM document to associate with the instance.  
*Required*: Yes  
*Type*: String  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)