How does Amazon ec2 user-data work?

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When we start instances and pass in the user-data, when is the data transmitted to the VM and where is it stored?

My first take on it was it is set as the USER_DATA env var, but we can also pass it as a file. So, the next question is where is that file stored? Is it generic to all instances or varies depending on AMI?

May 15, 2018 in Cloud Computing by brat_1
• 7,170 points
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1 answer to this question.

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Refer these:

·         http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html

·         http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/user-data.html

To throw some light on your queries.

User-data is available to the instance with a simple HTTP request at this URL:

http://169.254.169.254/latest/user-data
answered May 15, 2018 by DragonLord999
• 8,400 points

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