This is a text-only version of the following page on https://raymii.org:
Title : Openstack Glance Image Download, download Openstack images
Author : Remy van Elst
Date : 25-02-2015
URL : https://raymii.org/s/tutorials/Openstack_Glance_Image_Download.html
Format : Markdown/HTML
This guide shows you how download Openstack Images to your local machine using
the command line Glance client. You can use this, for example, to download a
copy of an image created from a VM, or to download the images your Openstack
provider provides and adapt those.
You can see all my [Openstack related articles here]. For example, how to use
[Duplicity to create Encrypted backups to the Openstack Swift Object Store]
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### Command Line tools
Make sure you have the Openstack command line tools installed. Follow the
official openstack guide [here]. If you have `pip` installed you can use that
to install the tools:
pip install python-novaclient
pip install python-cinderclient
pip install python-glanceclient
pip install python-keystoneclient
pip install python-neutronclient
pip install python-swiftclient
Save yourself some time and create a file named `computerc` with the below
When you are going to do stuff with the Openstack command line clients, load
That way, your authentication data are loaded and you don't have to give
parameters like `--os-username` and such.
### Openstack Overview
Openstack is a datacenter virtualization plaform consisting out of many
different tools and services. Here is a short overview of the different services
you might encounter.
#### Compute (Nova)
This is the virtualization service. It works with a hypervisor to create and
manage virtual machines. You can create a VM based on a specific "Flavour",
which is just a definition of specs like disk, cpu and ram.
#### Block Storage (Cinder)
This is the service which makes block devices (volumes) available to services. A
flavour can not be changed, just resized. If you want extra storage you need to
create a volume, attach it to the VM and mount it there for use.
#### Images (Glance)
This is the service which holds all the images. Images can be used to boot a VM
from. Images can be prepared with tools like `cloud-init` to make them behave
better in a cloud environment, for example, setting an SSH key or password at
### Listing images
When you've created a `computerc` file and loaded it up in your shell you can
start the process. You need the UUID of the image you want to download. Get a
list of all images using the `glance image-list` command:
$ glance image-list
| ID | Name | Disk | Container | Size | Status |
| 0a[...]5dd | example-test | raw | bare | 4843700224 | active |
| 13[...]b30 | example-2 | qcow2 | bare | 4762632192 | active |
| 22[...]eeb | FreeBSD-10.1 | qcow2 | bare | 736981504 | active |
| d2[...]625 | pfSense 2.1.5 | iso | bare | 403243008 | active |
The `ID` part is what you need. In this example it is trimmed.
### Download Image
Use the `glance image-download` command to download the image. By default it
will go to STDOUT, use the `--file` parameter to place the output in a file.
$ glance image-download --file ./example-test.img 0a[...]5dd
The command syntax is:
$ glance image-download --file $FILENAME $UUID
If you get the following error:
object of type 'generator' has no len()
Try executing the command without the `--progress` option.
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