State Manager is a powerful tool that helps to govern and manage the configuration of a managed system. For example, by using State Manager you can enforce a particular firewall rule for your fleet of managed instances and set that as the required State that needs to be enforced at all times. If the rules change outside of State Manager, it will automatically revert to match the required state's configuration, thus maintaining compliance and enforcing standardization over your environment.
Working with State Manager is quite simple and straightforward. You start off by selecting a state document (JSON based) that specifies the settings you need to configure or maintain your EC2 instances. These documents come predefined and you can create customized versions of them. With the document created, you can then select the individual managed instances, which can be either EC2 instances or even on-premises virtual machines, as well as specify a schedule for when and how...