# Create a sync configuration
<a name="syncconfigurations-create"></a>

You can use the **create-repository-link** command in the AWS Command Line Interface (AWS CLI) to create a link between your connection and the external repository to sync to.

Before you can create a sync configuration, you must have already created a repository link between your connection and your third-party repository.

**To create a sync configuration**

1. Open a terminal (Linux, macOS, or Unix) or command prompt (Windows). Use the AWS CLI to run the **create-repository-link** command. Specify the ARN of the associated connection, the owner ID, and the repository name. The following command creates a sync configuration with a sync type for a resource in CloudFormation. It also specifies the repository branch and configuration file in the repository. In this example, the resource is a stack named **`mystack`**.

   ```
   aws codeconnections create-sync-configuration --branch main --config-file filename --repository-link-id be8f2017-b016-4a77-87b4-608054f70e77 --resource-name mystack --role-arn arn:aws:iam::account_id:role/myrole --sync-type CFN_STACK_SYNC
   ```

1. This command returns the following output.

   ```
   {
       "SyncConfiguration": {
           "Branch": "main",
           "ConfigFile": "filename",
           "OwnerId": "account_id",
           "ProviderType": "GitHub",
           "RepositoryLinkId": "be8f2017-b016-4a77-87b4-608054f70e77",
           "RepositoryName": "MyRepo",
           "ResourceName": "mystack",
           "RoleArn": "arn:aws:iam::account_id:role/myrole",
           "SyncType": "CFN_STACK_SYNC"
       }
   ```