OpenStack client image save overflows RAM

I got an image that is 128GB. Tried to download it with openstack image save --file ... but it seems that client puts whole the file into the ram first. Of course it overflows it and fails. Why is that? How do I download image much bigger than available ram on the client machine?

Solution 1:

You could try the glance client, or you just use the API. The latter requires an authentication token in the x-auth-token HTTP header, which you can acquire with the openstack token issue command.

The openstack client might have memory issues, but I doubt that the entire image is copied to memory. I can't remember having seen this.