Defined in github.com/aws/aws-sdk-go/service/ec2/api.go
The user data to make available to the instance. For more information, see Running Commands on Your Linux Instance at Launch (http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/user-data.html) (Linux) and Adding User Data (http://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/ec2-instance-metadata.html#instancedata-add-user-data) (Windows). If you are using an AWS SDK or command line tool, Base64-encoding is performed for you, and you can load the text from a file. Otherwise, you must provide Base64-encoded text.