# How Amazon Directory Service uses Amazon Secrets Manager
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Amazon Directory Service provides multiple ways to use Microsoft Active Directory (AD) with other Amazon services. You can join an Amazon EC2 instance to your directory using secrets for credentials. For more information, in the *Amazon Direct Connect User Guide*, see:
+ [Seamlessly join a Linux EC2 instance to your Amazon Managed Microsoft AD directory](https://docs.amazonaws.cn/directoryservice/latest/admin-guide/seamlessly_join_linux_instance.html)
+ [Seamlessly join a Linux EC2 instance to your AD Connector directory](https://docs.amazonaws.cn/directoryservice/latest/admin-guide/ad_connector_seamlessly_join_linux_instance.html)
+ [Seamlessly join a Linux EC2 instance to your Simple AD directory](https://docs.amazonaws.cn/directoryservice/latest/admin-guide/simple_ad_seamlessly_join_linux_instance.html)