/fog

The Ruby cloud services library.

Primary LanguageRuby

fog is the Ruby cloud computing library, top to bottom:

  • Collections 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.

Getting Started ↑

sudo gem install fog

Now type ‘fog’ to try stuff, confident that fog will let you know what to do. 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

Collections ↑

A high level interface to each cloud is provided through collections, such as ‘images` and `servers`. You can see a list of available collections by calling `collections` on the connection object. You can try it out using the `fog` command:

>> AWS.collections
[:addresses, :directories, ..., :volumes, :zones]

Some collections are available across multiple providers:

  • compute providers have flavors, images and servers

  • dns providers have zones and records

  • storage providers have directories and files

Collections share basic CRUD type operations, such as:

  • all - fetch every object of that type from the provider.

  • create - initialize a new record locally and a remote resource with the provider.

  • get - fetch a single object by it’s identity from the provider.

  • new - initialize a new record locally, but do not create a remote resource with the provider.

As an example, we’ll try initializing and persisting a Rackspace Cloud server:

require 'fog'

compute = Fog::Compute.new(
  :provider           => 'Rackspace',
  :rackspace_api_key  => key,
  :rackspace_username => username
)

# boot a gentoo server (flavor 1 = 256, image 3 = gentoo 2008.0)
server = compute.servers.create(:flavor_id => 1, :image_id => 3, :name => 'my_server')
server.wait_for { ready? } # give server time to boot

# DO STUFF

server.destroy # cleanup after yourself or regret it, trust me

Models ↑

Many of the collection methods return individual objects, which also provide common methods:

  • destroy - will destroy the persisted object from the provider

  • save - persist the object to the provider

  • 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)

Mocks ↑

As you might imagine, testing code using Fog can be slow and expensive, constantly turning on and and shutting down instances. Mocking allows skipping this overhead by providing an in memory representation resources as you make requests. Enabling mocking easy to use, before you run other commands, simply run:

Fog.mock!

Then proceed as usual, if you run into unimplemented mocks fog will raise an error and as always contributions are welcome!

Requests ↑

Requests allow you to dive deeper when the models just can’t cut it. You can see a list of available requests by calling #requests on the connection object.

For instance, ec2 provides methods related to reserved instances that don’t have any models (yet). Here is how you can lookup your reserved instances:

$ fog
>> AWS[:ec2].describe_reserved_instances
#<Excon::Response [...]>

It will return an excon response, which has ‘body`, `headers` and `status`. Both return nice hashes.

Go forth and conquer ↑

Play around and use the console to explore or check out the getting started guide for more details. Once you are reading to start scripting fog, here is a quick hint on how to make connections without the command line thing to help you.

# create a compute connection
compute = Fog::Compute.new(:provider => 'AWS', :aws_access_key_id => ACCESS_KEY_ID, :aws_secret_access_key => SECRET_ACCESS_KEY)
# compute operations go here

# create a storage connection
storage = Fog::Storage.new(:provider => 'AWS', :aws_access_key_id => ACCESS_KEY_ID, :aws_secret_access_key => SECRET_ACCESS_KEY)
# storage operations go here

geemus says: “That should give you everything you need to get started, but let me know if there is anything I can do to help!”

Providers ↑

You should try out the (varying) support fog has for:

There are also the basics of these providers (that could use your love):

Special thanks to providers listed in bold italics for donating resources for fog tests!

Additional Resources ↑

Enjoy, and let me know what I can do to continue improving fog!

  • Follow @fog and/or @geemus on Twitter

  • Discuss in irc on the #ruby-fog channel on Freenode

  • Discuss via email on the mailing list (note: release notes appear on this list)

  • Report bugs or find stuff to work on in issues

  • Learn about contributing or find more info about the Providers (including some todo items)

  • See what already uses fog and add your own stuff to the list

  • Check out blog posts and other mentions from elsewhere press

Sponsorship ↑

All new work on fog is sponsored by Engine Yard

T-Shirts ↑

Wonder how you can get a shirt? Look no further!

  • Blue shirts go to people who have contributed indirectly, where contribution is a judgement call on geemus’s part (but he is a pretty nice guy).

  • Grey shirts and a follow from @fog go to people who have made it on to the contributors list by submitting code.

  • Black shirts go to people who have made it on to the collaborators list by coercing geemus into adding them (geemus is currently the only member of this list).

Copyright ↑

(The MIT License)

Copyright © 2010 geemus (Wesley Beary)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.