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