Python Boto List Storage Devices Attached to Instance

Question

I'm using Python 2.7 and Boto.latest.

I'm creating a dynamic inventory script and I would like to list the storage devices that are attached to each instance

Example:

ID: i-3rblah
Storage:
-  /dev/sda 
- /dev/sdb
- /dev/sdc

Tried:

for reservation in reservations:
  for i in reservation.instances:
    volumes = conn.get_all_volumes(filters={'attachment.instance-id': i.id})
    print i.__dict__
    print volumes.__dict__ 

So I have some volume info, but not what the VolumeID is mapped to.

Answer 1

I think you want the BlockDeviceMapping for the instance. Based on your example above the following should find the block_device_mapping for the instance which is a dictionary. Each key in the dictionary is a device name and the value is a BlockDeviceType object which contain information about the block device associated with that device name.

for reservation in reservations:
    for instance in reservation.instances:
        bdm = instance.block_device_mapping
        for device in bdm:
            print('Device: {}'.format(device)
            bdt = bdm[device]
            print('\tVolumeID: {}'.format(bdt.volume_id))
            print('\tVolume Status: {}'.format(bd.volume_status))

This should print something like:

Device: /dev/sda1
    VolumeID: vol-1d011806
    Volume Size: attached

There are other fields in the BlockDeviceType object. You should be able to find more info about that in the Boto docs.