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= fog
fog helps you interact with cloud services. fog is a work in progress.
fog helps you interact with cloud services.
== Install
The quick and dirty, top to bottom:
* Models provide a simplified interface, making clouds easier to work with and switch between.
* Requests allow power users to get the most out of the features of each individual cloud.
* Mocks make testing and integrating a breeze.
sudo gem install fog
Put them together and you get a great cloud computing experience, but we are getting ahead of ourselves...
== Getting Started
You can start stumbling around as soon as you install with the fog command line tool.
After installing, just type 'fog' to get started.
If you don't have credentials setup it will let you know what to do.
sudo gem install fog
Then just start playing around, fog should let you know if you are forget things.
Now just type 'fog' to trying stuff out, confident that fog should let you know what you need to do.
For example if you try to create a server but leave out stuff:
server = AWS.servers.create
You'll get reminded that things are missing.
Here is an example of wading through server creation for Amazon Elastic Compute Cloud:
>> server = AWS.servers.create
ArgumentError: image_id is required for this operation
>> server = AWS.servers.create(:image_id => 'ami-5ee70037')
<Fog::AWS::EC2::Server [...]>
>> server.destroy # cleanup after yourself or regret it, trust me
true
So just add the missing stuff and you are off to the races:
== Collections
server = AWS.servers.create(:image_id => 'ami-5ee70037')
Nouns like Images and Servers are collections, which form the interface to the cloud.
Collections provide all, create, get and new methods.
all fetches every object of that type from the cloud.
create initializes a new record locally and then persists it to the cloud.
get fetches a single object by its identity.
new initializes a new record locally.
But don't forget to cleanup or you'll regret it when you get the bill:
Common compute nouns are flavors, images and servers.
server.destroy
Common storage nouns are directory and file.
Rinse, repeat, enjoy!
== Working with Servers
Lets boot up a server on EC2
As an example, we'll try initializing and persisting a rackspace server:
require 'fog'
# initialize a connection to Amazon Elastic Compute Cloud
connection = Fog::AWS::EC2.new(
:aws_access_key_id => id,
:aws_secret_access_key => key
)
# boot a gentoo server
server = connection.servers.new(:image_id => 'ami-5ee70037')
# you might also want to add the server to security groups, which goes like this:
# AWS.servers.create(:image_id => 'ami-5ee70037', :groups => ['web', 'db'])
# wait for it to be ready to do stuff
server.wait_for { ready? }
# DO STUFF
# shutdown the server
server.destroy
Now we will try again, but with Rackspace
# initialize a connection to Rackspace Servers
connection = Fog::Rackspace::Servers.new(
:rackspace_api_key => key,
@ -76,53 +58,62 @@ Now we will try again, but with Rackspace
# shutdown the server
server.destroy
== Working with Directories and Files
== Models
require 'fog'
Many of the collection methods return individual objects, which provide destroy, save and wait_for methods.
destroy will destroy the persisted object from the cloud
save will persist the object to the cloud
wait_for takes a block and waits for either the block to return true for the object or for a timeout (defaults to 10 minutes)
# initialize a connection to Amazon Simple Storage Solution
connection = Fog::AWS::S3.new(
== Mocks
Mocking provides an in memory representation of clouds as you make different requests.
This representation allows subsequent calls to mimic the behavior of the cloud while eliminating the cost and time needed to actually run tests against various providers.
Mocking is easy to use, just write any functions as you normally would and then in your tests ensure you call:
Fog.mock!
Make sure you call it first (before you initialize any connections) and all your calls should now run in mock mode.
If you run into the edges of mock implementation it should let you know that they haven't been implemented yet.
== Requests
Requests allow you to dive deeper when the models just can't cut it.
For instance, ec2 provides methods related to reserved instances that don't have any models (yet anyway).
You can get a description of your reserved instances like this:
connection = Fog::AWS::EC2.new(
:aws_access_key_id => id,
:aws_secret_access_key => key
)
# create a directory
directory = connection.directory.create(:name => 'directoryname')
connection.describe_reserved_instances
# create a new file in your directory
directory.files.create(:key => 'filename', :body => 'filebody')
It will return a nice ruby hash that you can get whatever data you might need from.
# connect to your directory
directory = connection.directories.get('directoryname')
== Go forth and conquer
# get your file
file = directory.files.get('filename')
That should give you some stuff to try and places to look.
# delete the file
file.destroy
You should try out the (varying) support fog has for:
* AWS [EC2, S3, SimpleDB]
* Rackspace [Files, Servers]
* Slicehost
* Terremark vCloud Express
# delete the directory
directory.destroy
{Let me know}[http://github.com/geemus/fog/issues] what I may have missed or should add.
== More info
Enjoy, and let me know what I can do to continue improving fog!
* Follow {@geemus}[http://twitter.com/geemus] on Twitter.
* See upcoming work in the {tracker}[http://www.pivotaltracker.com/projects/54635].
* Report bugs in {issues}[http://github.com/geemus/fog/issues].
== Supports
* AWS EC2
* AWS S3
* AWS SimpleDB (no models yet)
* Rackspace Files (no models yet, just getting started on requests)
* Rackspace Servers (some requests, server model, just getting started)
== Copyright
(The MIT License)
Copyright (c) 2009 {geemus (Wesley Beary)}[http://github.com/geemus]
Copyright (c) 2010 {geemus (Wesley Beary)}[http://github.com/geemus]
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the