Windows Server 2016 Nears End of Extended Support; Engineer Shares In-Place EC2 Upgrade Process

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Windows Server 2016 reaches the end of extended support on January 12, 2027, prompting organizations running it on Amazon EC2 to plan upgrades. One engineer upgraded more than 10 EC2 instances in place to Windows Server 2022, using an AI agent for pre- and post-upgrade validation while a human approved each step. Key lessons included pinning the Windows edition to avoid stalls, enforcing a 20 GB free-disk-space requirement after a root volume was expanded from 30 GB to 50 GB, and avoiding copying installation media onto the C: drive. The engineer also recommended using Replace Root Volume rather than AMI restoration for rollback, since the latter changes the instance ID and IP address, and starting with a canary upgrade on a single server. Finally, the account advised testing application functionality rather than only the OS version, and verifying that SSM connectivity and patch-tool OS detection are working after the upgrade.

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