cfn-hup

• cfn-init only run once as part of bootstrapping (user data)

• ..if cloudformation::init is updated, it isn’t rerun

  💡 **cfn-hup helper** is a daemon (background process) that detects changes in resource metadata and runs user-specified actions when a change is detected. This allows you to make configuration updates on your running Amazon EC2 instances through the `UpdateStack` API action.

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