VM::EC2::Snapshot(3) Object describing an Amazon EBS snapshot

SYNOPSIS


use VM::EC2;
$ec2 = VM::EC2->new(...);
@snap = $ec2->describe_snapshots;
for my $snap (@snapshots) {
$id = $snap->snapshotId;
$vol = $snap->volumeId;
$state = $snap->status;
$time = $snap->startTime;
$progress = $snap->progress;
$size = $snap->volumeSize;
$description = $snap->description;
$tags = $snap->tags;
}
# use a snapshot as the root device for a new AMI
$ami = $snap->register_image(-name => 'My new image',
-kernel_id => 'aki-407d9529',
-architecture => 'i386');
#create a volume from the snapshot
$vol = $snap->create_volume(-zone => 'us-east-1a');

DESCRIPTION

This object is used to describe an Amazon EBS snapshot.

METHODS

The following object methods are supported: 

 snapshotId       -- ID of this snapshot
 ownerId          -- Owner of this snapshot
 volumeId         -- ID of the volume snapshot was taken from
 status           -- Snapshot state, one of "pending", "completed" or "error"
 startTime        -- Timestamp for when snapshot was begun.
 progress         -- The progress of the snapshot, in percent.
 volumeSize       -- Size of the volume, in gigabytes.
 description      -- Description of the snapshot
 ownerAlias       -- AWS account alias, such as "self".
 encrypted        -- True if snapshot is encrypted
 tags             -- Hashref containing tags associated with this group.
                     See L<VM::EC2::Generic>.

In addition, this class provides several convenience functions:

$vol = $snap->from_volume

Returns the VM::EC2::Volume object that this snapshot was originally derived from. If the original volume no longer exists because it has been deleted, this will return undef; if -raise_error was passed to the VM::EC2 object, this will raise an exception.

@vol = $snap->to_volumes

Returns all VM::EC2::Volume objects that were derived from this snapshot. If no volumes currently exist that satisfy this criteria, returns an empty list, but will not raise an error.

$image = $snap->register_image(%args)

Register a new AMI using this snapshot as the root device. By default, the root device will be mapped to /dev/sda1 and will delete on instance termination. You can modify this behavior and add additional block devices.

Arguments: 

 -name                 Name for this image (required)
 -description          Description of this image
 -kernel_id            Kernel for this image (recommended)
 -ramdisk_id           Ramdisk for this image
 -architecture         Architecture ("i386" or "x86_64")
 -root_device_name     Specify the root device based
                       on this snapshot (/dev/sda1).
 -root_size            Size of the root volume (defaults
                       to size of the snapshot).
 -root_delete_on_termination   True value (default) to delete
                       the root volume after the instance
                       terminates. False value to keep the
                       EBS volume available.
 -block_device_mapping Additional block devices you wish to
                       incorporate into the image.
 -block_devices        Same as above.

See VM::EC2 for information on the syntax of the -block_device_mapping argument. If the root device is explicitly included in the block device mapping argument, then the arguments specified in -root_size, and -root_delete_on_termination will be ignored, and the current snapshot will not automatically be used as the root device.

The return value is a VM::EC2::Image. You can call its current_status() method to poll its availability: 

  $snap = $ec2->describe_snapshots('snap-123456');
  $ami = $snap->register_image(-name          => 'My new image',
                               -kernel_id     => 'aki-407d9529',
                               -architecture  => 'i386',
                               -block_devices => '/dev/sdc=ephemeral0'
  ) or die $ec2->error_str;
  while ($ami->current_status eq 'pending') {
    print "$ami: ",$ami->current_status,"\n"
    sleep 30;  # takes a long time to register some images
  }
  print "$ami is ready to go\n";

$volume = $snap->create_volume(%args)

Create a new volume from this snapshot. Arguments are: 

 -availability_zone    -- An availability zone from
                          describe_availability_zones (required)
 -size                 -- Size of the volume, in GB (between 1 and 1024).

If -size is not provided, then the new volume will have the same size as the snapshot.

Optional Arguments: 

 -volume_type          -- The volume type.  standard or io1, default is
                          standard
 -iops                 -- The number of I/O operations per second (IOPS) that
                          the volume supports.  Range is 100 to 4000.  Required
                          when volume type is io1.  IOPS must be 30-to-1 ratio
                          to size.  ie: 3000 IOPS volume must be at least 100GB.

On success, the returned value is a VM::EC2::Volume object.

$status = $snap->current_status

Refreshes the snapshot and returns its current status.

$boolean = $snapshot->is_public

Return true if the snapshot's createVolume permissions allow the ``all'' group to create volumes from the snapshot.

$boolean = $snapshot->make_public($public)

Modify the createVolumePermission attribute to allow the ``all'' group to create volumes from this snapshot. Provide a true value to make the snapshot public, a false one to make it private.

@user_ids = $snap->createVolumePermissions()

@user_ids = $snap->authorized_users

Returns a list of user IDs with createVolume permissions for this snapshot. The result is a list of VM::EC2::Snapshot::CreateVolumePermission objects, which interpolate as strings corresponding to either the user ID, or the group named ``all.''

The two methods are aliases of each other.

$boolean = $snap->add_authorized_users($id1,$id2,...)

$boolean = $snap->remove_authorized_users($id1,$id2,...)

$boolean = $snap->reset_authorized_users

These methods add and remove user accounts which have createVolume permissions for the snapshot. The result code indicates whether the list of user IDs were successfully added or removed. To add the ``all'' group, use make_public().

reset_authorized_users() resets the list users authored to create volumes from this snapshot to empty, effectively granting volume creation to the owner only.

See also authorized_users().

$size = $snap->size

Alias to volumeSize, provided for consistency with VM::EC2::Volume->size.

$snap->refresh

Refreshes the snapshot from information provided by AWS. Use before checking progress or other changeable elements.

$snapshot_copy = $snapshot->copy(-region=>$dest_region, -description=>$desc)

Copies the snapshot to the same or different region.

Required Argument:
 -region        The region to copy the snapshot to

Optional Argument:
 -description   Description of the new snapshot

Returns a VM::EC2::Snapshot object if successful.

STRING OVERLOADING

When used in a string context, this object will interpolate the snapshotId.

AUTHOR

Lincoln Stein <[email protected]>.

Copyright (c) 2011 Ontario Institute for Cancer Research

This package and its accompanying libraries is free software; you can redistribute it and/or modify it under the terms of the GPL (either version 1, or at your option, any later version) or the Artistic License 2.0. Refer to LICENSE for the full license text. In addition, please see DISCLAIMER.txt for disclaimers of warranty.

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