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# AWS::Lambda::Function FileSystemConfig
<a name="aws-properties-lambda-function-filesystemconfig"></a>

Details about the connection between a Lambda function and an [Amazon EFS file system](https://docs.aws.amazon.com/lambda/latest/dg/configuration-filesystem.html) or an [Amazon S3 Files file system](https://docs.aws.amazon.com/lambda/latest/dg/configuration-filesystem.html).

## Syntax
<a name="aws-properties-lambda-function-filesystemconfig-syntax"></a>

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

### JSON
<a name="aws-properties-lambda-function-filesystemconfig-syntax.json"></a>

```
{
  "[Arn](#cfn-lambda-function-filesystemconfig-arn)" : String,
  "[LocalMountPath](#cfn-lambda-function-filesystemconfig-localmountpath)" : String
}
```

### YAML
<a name="aws-properties-lambda-function-filesystemconfig-syntax.yaml"></a>

```
  [Arn](#cfn-lambda-function-filesystemconfig-arn): String
  [LocalMountPath](#cfn-lambda-function-filesystemconfig-localmountpath): String
```

## Properties
<a name="aws-properties-lambda-function-filesystemconfig-properties"></a>

`Arn`  <a name="cfn-lambda-function-filesystemconfig-arn"></a>
The Amazon Resource Name (ARN) of the Amazon EFS or Amazon S3 Files access point that provides access to the file system.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^arn:aws[a-zA-Z-]*:elasticfilesystem:(eusc-)?[a-z]{2}((-gov)|(-iso([a-z]?)))?-[a-z]+-\d{1}:\d{12}:access-point/fsap-[a-f0-9]{17}$|^arn:aws[-a-z]*:s3files:[0-9a-z-:]+:file-system/fs-[0-9a-f]{17,40}/access-point/fsap-[0-9a-f]{17,40}$`  
*Maximum*: `200`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`LocalMountPath`  <a name="cfn-lambda-function-filesystemconfig-localmountpath"></a>
The path where the function can access the file system, starting with `/mnt/`.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^/mnt/[a-zA-Z0-9-_.]+$`  
*Maximum*: `160`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)