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Add this line to your application's Gemfile:

gem 'fog-aws'

And then execute:

$ bundle

Or install it yourself as:

$ gem install fog-aws


Before you can use fog-aws, you must require it in your application:

require 'fog/aws'

Since it's a bad practice to have your credentials in source code, you should load them from default fog configuration file: ~/.fog. This file could look like this:

  aws_access_key_id:     <YOUR_ACCESS_KEY_ID>
  aws_secret_access_key: <YOUR_SECRET_ACCESS_KEY>


Connecting to the EC2 Service:

ec2 = :provider => 'AWS', :region => 'us-west-2'

You can review all the requests available with this service using #requests method:

ec2.requests # => [:allocate_address, :assign_private_ip_addresses, :associate_address, ...]

Launch an EC2 on-demand instance:

response = ec2.run_instances(
  "InstanceType"  => "t1.micro",
  "SecurityGroup" => "ssh",
  "KeyName"       => "miguel"
instance_id = response.body["instancesSet"].first["instanceId"] # => "i-02db5af4"
instance = ec2.servers.get(instance_id)
instance.wait_for { ready? }
puts instance.public_ip_address # => "356.300.501.20"

Terminate an EC2 instance:

instance = ec2.servers.get("i-02db5af4")

Fog::AWS is more than EC2 since it supports many services provided by AWS. The best way to learn and to know about how many services are supported is to take a look at the source code. To review the tests directory and to play with the library in bin/console can be very helpful resources as well.


Connecting to the S3 Service:

s3 = 'AWS', region: 'eu-central-1')

Creating a file:

directory = 'gaudi-portal-dev')
file = directory.files.create(key: 'user/1/Gemfile', body:'Gemfile'), tags: 'Org-Id=1&Service-Name=My-Service')

Listing files:

directory = s3.directories.get('gaudi-portal-dev', prefix: 'user/1/')

Generating a URL for a file: 'user/1/Gemfile').url( + 60)

Copying a file

directory = 'gaudi-portal-dev')
file = directory.files.get('user/1/Gemfile')
file.copy("target-bucket", "user/2/Gemfile.copy")

To speed transfers of large files, the concurrency option can be used to spawn multiple threads. Note that the file must be at least 5 MB for multipart uploads to work. For example:

directory = 'gaudi-portal-dev')
file = directory.files.get('user/1/Gemfile')
file.multipart_chunk_size = 10 * 1024 * 1024
file.concurrency = 10
file.copy("target-bucket", "user/2/Gemfile.copy")


See the online documentation for a complete API reference.


After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.


  1. Fork it ( )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request