If you want to download a glance image stored in a RBD backend.
First choose the image you want to export:
$ nova image-list +--------------------------------------+----------------------+--------+--------------------------------------+ | ID | Name | Status | Server | +--------------------------------------+----------------------+--------+--------------------------------------+ | 60beab84-81a7-46d1-bb4a-19947937dfe3 | precise-ceph | ACTIVE | | | e5d3c6dc-37b3-41e8-b375-987fe7935080 | cloud-pipe-template | ACTIVE | | +--------------------------------------+----------------------+--------+--------------------------------------+
And export it with the following command:
$ rbd export --pool=images e5d3c6dc-37b3-41e8-b375-987fe7935080 cloud-pipe-template.img writing 8388608 bytes at ofs 0 writing 8388608 bytes at ofs 8388608 writing 8388608 bytes at ofs 16777216 writing 8388608 bytes at ofs 25165824 writing 8388608 bytes at ofs 33554432 writing 8388608 bytes at ofs 67108864 writing 8388608 bytes at ofs 75497472 writing 8388608 bytes at ofs 83886080 writing 8388608 bytes at ofs 92274688 ... ... Exporting image: 100% complete...done.
Check your image size:
$ du -h cloud-pipe-template.img 879M cloud-pipe-template.img
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