Which responsibility is AWS responsible for when a company runs its databases on Amazon EC2 instances?
Under the shared responsibility model, once a database runs on self-managed EC2 instances, the customer owns every guest-level task — applying OS patches, patching the database software, and taking backups — while AWS's role is limited to the underlying infrastructure, including building and publishing the base Amazon Machine Images that already have an operating system installed. Because AWS performs that initial OS installation when it creates its AMIs, operating system installation (at the AMI level) is the one item in this list that falls to AWS rather than the customer.
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