# Using CloudFormation to create Amazon OpenSearch Serverless collections
<a name="serverless-cfn"></a>

You can use CloudFormation to create Amazon OpenSearch Serverless resources such as collections, security policies, and VPC endpoints. For the comprehensive OpenSearch Serverless CloudFormation reference, see [Amazon OpenSearch Serverless](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_OpenSearchServerless.html) in the *CloudFormation User Guide*.

The following sample CloudFormation template creates a simple data access policy, network policy, and security policy, as well as a matching collection. It's a good way to get up and running quickly with Amazon OpenSearch Serverless and provision the necessary elements to create and use a collection.

**Important**  
This example uses public network access, which isn't recommended for production workloads. We recommend using VPC access to protect your collections. For more information, see [AWS::OpenSearchServerless::VpcEndpoint](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-opensearchserverless-vpcendpoint.html) and [Data plane access through AWS PrivateLink](serverless-vpc.md).

```
AWSTemplateFormatVersion: 2010-09-09
Description: 'Amazon OpenSearch Serverless template to create an IAM user, encryption policy, data access policy and collection'
Resources:
  IAMUSer:
    Type: 'AWS::IAM::User'
    Properties:
      UserName:  aossadmin
  DataAccessPolicy:
    Type: 'AWS::OpenSearchServerless::AccessPolicy'
    Properties:
      Name: quickstart-access-policy
      Type: data
      Description: Access policy for quickstart collection
      Policy: !Sub >-
        [{"Description":"Access for cfn user","Rules":[{"ResourceType":"index","Resource":["index/*/*"],"Permission":["aoss:*"]},
        {"ResourceType":"collection","Resource":["collection/quickstart"],"Permission":["aoss:*"]}],
        "Principal":["arn:aws:iam::${AWS::AccountId}:user/aossadmin"]}]
  NetworkPolicy:
    Type: 'AWS::OpenSearchServerless::SecurityPolicy'
    Properties:
      Name: quickstart-network-policy
      Type: network
      Description: Network policy for quickstart collection
      Policy: >-
        [{"Rules":[{"ResourceType":"collection","Resource":["collection/quickstart"]}, {"ResourceType":"dashboard","Resource":["collection/quickstart"]}],"AllowFromPublic":true}]
  EncryptionPolicy:
    Type: 'AWS::OpenSearchServerless::SecurityPolicy'
    Properties:
      Name: quickstart-security-policy
      Type: encryption
      Description: Encryption policy for quickstart collection
      Policy: >-
        {"Rules":[{"ResourceType":"collection","Resource":["collection/quickstart"]}],"AWSOwnedKey":true}
  Collection:
    Type: 'AWS::OpenSearchServerless::Collection'
    Properties:
      Name: quickstart
      Type: TIMESERIES
      Description: Collection to holds timeseries data
    DependsOn: EncryptionPolicy
Outputs:
  IAMUser:
    Value: !Ref IAMUSer
  DashboardURL:
    Value: !GetAtt Collection.DashboardEndpoint
  CollectionARN:
    Value: !GetAtt Collection.Arn
```