attach ebs on ec2 instance create

Question

I am trying to create and attach an EBS volume on instance creation but I am getting error of no option :ebs , I am able to do this from AWS console so there should be some way with which I can create instance using a volume as disk

instance = ec2.instances.create(:image_id => ami-aa***,
  :key_name => ec2.key_pairs["Dev-node"].name,
  :ebs => {
    :volume_size => 20, #size in GBs
    :delete_on_termination => true
  },
  :instance_type => 't1.micro')

Answer 1

I believe you need to pass the :block_device_mapping key, which should be an Array of hashes as outlined here , eg:

instance = ec2.instances.create(
  :image_id => "ami-aa***",
  :key_name => ec2.key_pairs["Dev-node"].name,
  :block_device_mapping => [
    {
      "DeviceName" => "/dev/sdf",
      "Ebs.VolumeSize" => 20,
      "Ebs.DeleteOnTermination" => true
    }
  ],
  :instance_type => 't1.micro'
)