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# AWS::EC2::Instance SsmAssociation

Specifies the SSM document and parameter values in AWS Systems Manager to associate with an instance.
`SsmAssociations` is a property of the [AWS::EC2::Instance](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-instance.html) resource. 
## Syntax

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

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

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

`AssociationParameters` 
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.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`DocumentName` 
The name of an SSM document to associate with the instance. 
*Required*: Yes 
*Type*: String 
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