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I have created an autoscaling group with aws cloud formation but anytime I change the userdata, the instances don't get replaced. Is there a way to force this behavior?

Utibeabasi Umanah
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    There really isn't a great way using CF other than making the instance part of ASG with an [upgrade policy](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-attribute-updatepolicy.html) – jordanm Nov 20 '21 at 19:16

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You need to implement instance-refresh for ASG: https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-instance-refresh.html

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Manually you need to terminate the instance and new instance should automatically spin-up depending on ASG configuration. You should able to see userdata

Vikas Banage
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