Class: AWS::EC2::Volume

Inherits:
Resource
  • Object
show all
Includes:
TaggedItem
Defined in:
lib/aws/ec2/volume.rb

Overview

Represents an Amazon EBS volume.

Examples:

Create an empty 15GiB volume and attach it to an instance

volume = ec2.volumes.create(:size => 15,
                            :availability_zone => "us-east-1a")
attachment = volume.attach_to(ec2.instances["i-123"], "/dev/sdf")
sleep 1 until attachment.status != :attaching

Remove all attachments from a volume and then delete it

volume.attachments.each do |attachment|
  attachment.delete(:force => true)
end
sleep 1 until volume.status == :available
volume.delete

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from TaggedItem

#add_tag, #clear_tags, #tags

Instance Attribute Details

#availability_zone ⇒ AvailabilityZone (readonly)

Availability Zone in which the volume was created.

Returns:



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# File 'lib/aws/ec2/volume.rb', line 56

def availability_zone
  @availability_zone
end

#create_time ⇒ Time (readonly)

The time at which the volume was created.

Returns:

  • (Time) —

    the current value of create_time



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# File 'lib/aws/ec2/volume.rb', line 56

def create_time
  @create_time
end

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/aws/ec2/volume.rb', line 60

def id
  @id
end

#size ⇒ Integer (readonly)

The size of the volume in gigabytes.

Returns:

  • (Integer) —

    the current value of size



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# File 'lib/aws/ec2/volume.rb', line 56

def size
  @size
end

#status ⇒ Symbol (readonly) Also known as: state

The status of the volume. Possible values:

  • :creating

  • :available

  • :in_use

  • :deleting

  • :deleted

  • :error

Returns:

  • (Symbol) —

    the current value of status



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# File 'lib/aws/ec2/volume.rb', line 56

def status
  @status
end

Instance Method Details

#attach_to(instance, device) ⇒ Attachment Also known as: attach

Attaches the volume to an instance.

Parameters:

  • instance (Instance) —

    The instance to which the volume attaches. The volume and instance must be within the same Availability Zone and the instance must be running.

  • device (String) —

    How the device is exposed to the instance (e.g., /dev/sdh, or xvdh).

Returns:

  • (Attachment) —

    An object representing the attachment, which you can use to query the attachment status.



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# File 'lib/aws/ec2/volume.rb', line 95

def attach_to(instance, device)
  resp = client.attach_volume(:volume_id => id,
                              :instance_id => instance.id,
                              :device => device)
  Attachment.new(self,
                 Instance.new(resp.instance_id),
                 resp.device,
                 :config => config)
end

#attachments ⇒ AttachmentCollection

Returns The collection of attachments that involve this volume.

Returns:



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# File 'lib/aws/ec2/volume.rb', line 135

def attachments
  AttachmentCollection.new(self, :config => config)
end

#create_snapshot(description = nil) ⇒ Snapshot

Returns A new snapshot created from the volume.

Parameters:

  • description (String) (defaults to: nil) —

    An optional description of the snapshot. May be up to 255 characters in length.

Returns:

  • (Snapshot) —

    A new snapshot created from the volume.



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# File 'lib/aws/ec2/volume.rb', line 77

def create_snapshot(description = nil)
  opts = { :volume => self }
  opts[:description] = description if description
  SnapshotCollection.new(:config => config).
    create(opts)
end

#delete ⇒ Object

Deletes the volume.



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# File 'lib/aws/ec2/volume.rb', line 69

def delete
  client.delete_volume(:volume_id => id)
end

#detach_from(instance, device, opts = {}) ⇒ Object

Detaches the volume from an instance.

Parameters:

  • instance (Instance) —

    The instance to detach from.

  • device (String) —

    The device name.

  • opts (Hash) (defaults to: {}) —

    Additional options for detaching the volume.

Options Hash (opts):

  • :force (Boolean) —

    Forces detachment if the previous detachment attempt did not occur cleanly (logging into an instance, unmounting the volume, and detaching normally). This option can lead to data loss or a corrupted file system. Use this option only as a last resort to detach a volume from a failed instance. The instance will not have an opportunity to flush file system caches or file system metadata. If you use this option, you must perform file system check and repair procedures.



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# File 'lib/aws/ec2/volume.rb', line 124

def detach_from(instance, device, opts = {})
  a = Attachment.new(self,
                     Instance.new(instance.id),
                     device,
                     :config => config)
  a.delete
  a
end

#exists? ⇒ Boolean

Returns True if the volume exists.

Returns:

  • (Boolean) —

    True if the volume exists.



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# File 'lib/aws/ec2/volume.rb', line 140

def exists?
  resp =
    client.describe_volumes(:filters => [{ :name => 'volume-id',
                                           :values => [id] }]) and
    resp.volume_index.key?(id)
end

#snapshot ⇒ Snapshot

Returns Snapshot from which the volume was created (may be nil).

Returns:

  • (Snapshot) —

    Snapshot from which the volume was created (may be nil).



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# File 'lib/aws/ec2/volume.rb', line 154

def snapshot;
  if snapshot_id = self.snapshot_id
    Snapshot.new(snapshot_id, :config => config)
  end
end