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We are starting instances, and accessing the user-data we place. But does anybody understand the internals of this operation (from Amazon's side)? When we pass in the user-data, at what point is that data transmitted to the VM (is this a Xen feature) and where is it stored?

I first thought it was set as the USER_DATA env var, but we can also pass it as a file. Where is that file stored? Is it generic to all instances or varies depending on AMI?

This is not a problem per se, just wanted to know how Amazon does this.

1 Answer

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by (44.4k points)

The usage of a simple HTTP request at this particular URL will avail the user-data to the instance:

Amazon EC2 does not put user-data directly on to the instance, although there are many AMIs have the code which instructs the instance to download and process user-data automatically.

Check out these links:

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