Will enabling Active Directory replace running instances?
Yes. AWS says adding, changing or removing options in the Active Directory namespace reprovisions EC2 instances through a rolling update. Plan the configuration change and check for stale computer objects after instances are replaced.
Answered in
Elastic Beanstalk Can Join Windows Instances to Active Directory Before DeployingElastic Beanstalk joins Windows instances to Active Directory at launch. Check platform, DNS, IAM and OU requirements—and why Ready can hide a failed join.
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