AWS Systems Manager (SSM) is an integral component for managing EC2 and other compute fleets, offering capabilities such as patch management, parameter store, and managing changes across a fleet of servers. It also offers a service called Session Manager allowing secure, audited access to EC2 instances without needing to expose the instances on the Internet.
In February 2023, AWS announced a new solution called Default Host Management Configuration or DHMC, to simply the setup of the core SSM capabilities by providing a method of ensuring that SSM was available for all instances in an account.
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