Download file from s3 to ec2 instance

An easy interface to query the EC2 metadata API, with caching.

Use the AWS SDK for Python (aka Boto) to download a file from an S3 bucket. Opening new issue as requested by Megan in this thread: #6797 (comment) I am seeing this in our current Windows Server 2016 builds. I am creating a server image with 6 drives for SQL.