AmazonS3
mstannard@gmail.com

What is it?
S3 = Simple Storage System
\"Amazon S3 is storage for the Internet. It
is designed to make web-scale computing
easier for developers.\"

Features
Write, read, delete from 1B to 5GB
REST and SOAP interfaces
HTTP & BitTorrent protocols supported
Authentication built-in
US & European storage

Why use it?
CDN
Fast
Scalable
Simple
Inexpensive
Reliable 99.99%

Basic Concepts
Object - data + metadata (custom + some standard)
Bucket - the storage container (max 100 / dev)
- must be unique across whole S3 service
Key - unique identifier of an object in
a bucket

Using S3 with Rails
Signup at Amazon
Install AWS::S3 gem
Install attachment_fu plugin

config/amazons3.yml
development:
bucket_name: reading_eggs_development
access_key_id: my_access_key
secret_access_key: my_secret_key
test:
bucket_name: reading_eggs_test
access_key_id: my_access_key
secret_access_key: my_secret_key
prod:
etc.....

attachment_fu
before:
has_attachment :content_type => 'application/x-shockwave-flash',
:storage => :file_system,
:path_prefix => 'path/to/files/',
:max_size => 10.megabytes

attachment_fu
after:
has_attachment :content_type => 'application/x-shockwave-flash',
:storage => :s3,
:max_size => 10.megabytes

attachment_fu
access:
>> p = PartFile.find(:first)
=> #<PartFile:0x23a0eb0
@attributes={\"content_type\"=>\"application/x-shockwave-flash\",
\"size\"=>\"4434939\", \"id\"=>\"315\", \"filename\"=>\"I_and_a.swf\"}
>> p.public_filename
=> \"http://s3.amazonaws.com/reading_eggs_dev/part_files/315/
I_and_a.swf\"
>> p.full_filename
=> \"part_files/315/I_and_a.swf\"
>> p.bucket_name
=> \"reading_eggs_dev\"

Pricing
Storage
$0.15 per GB-Month of storage used
Data Transfer
$0.10 per GB - all data transfer in
$0.18 per GB - first 10 TB / month data transfer out
$0.16 per GB - next 40 TB / month data transfer out
$0.13 per GB - data transfer out / month over 50 TB
Requests
$0.01 per 1,000 PUT or LIST requests
$0.01 per 10,000 GET and all other requests*
* No charge for delete requests

Sample Costings
Data Storage Costs
1GB/M $0.15
1 GB Storage = $0.15
Bandwidth Costs
5000 Users
200 MB / User / Month
0.2 GB * 5000 = 1000GB * $0.18 = $180
Request Costs
Request = 200/User/Month = 5000 * 200 = 1M get requests
1000000/10000 = 100 * $0.01 = $1
Total Cost
US$181.15

Resources
Amazon S3 : http://aws.amazon.com/s3
AWS::S3 gem : http://amazon.rubyforge.org/
s3fox : http://www.rjonna.com/ext/s3fox.php
s3 calc : http://calculator.s3.amazonaws.com