1. Web Server Design Week 16 Old Dominion University
Department of Computer Science
CS 495/595 Spring 2007
Michael L. Nelson
4/23/07

2. Amazon S3 “Simple Storage Service” Premise: http://aws.amazon.com/s3
part of a family of Amazon Web Services (AWS), including “Elastic Compute Cloud (EC2)” and “Simple Queueing Service (SQS)”
Premise:
cheap, remote storage service accessible via http
no initial fee, no maintenance fee
$0.15 per GB/month storage, $0.20 per GB transferred
private/public X read/write access available

3. Core Concepts Registration: Bucket Object AWS access key ID
semantic free name space for your account
Secret access key
used to authenticate to AWS
Bucket
namespace for referencing your objects; must be globally unique
you can have buckets per AWS access key
buckets hold 0 or more objects
Object
files (placed in buckets); up to 5GB in a single object
“key” is the identifier for the object placed in a bucket

4. Access Points 3 different URLs for REST access: Where: For more info:
Where:
bucket = your namespace
key = identifier of the object in the bucket
For more info:

5. Examples: These are the same (& real):
These would be the same (but not real):

6. Authenticating to AWS Can authenticate to AWS via:
“Authorization” http header using the AWS authentication scheme
cf. “Basic” & “Digest in RFC-2616
URL arguments
HMAC: Keyed-Hashing for Message Authentication
RFC-2104:

7. A Tour of the REST API for S3