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What is the difference between images and volumes?

asked 2013-10-08 04:03:28 -0500

anonymous user

Anonymous

I've been reading many of the openstack docs and have already a test installation thanks to stackforge, but I seem to be missing a critical piece of insight into what exactly the difference between volumes and images is. Obviously they support different use-cases (e.g. "launch an image" vs. "boot from volume"), but I've not found a consise explanation what is what and how this fits together.

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answered 2013-10-08 05:49:20 -0500

sngirame gravatar image

As far as my understanding goes

Images are similar to VM templates of vmware, wherein OS is pre-installed & you can create instances out of it. Even if you do not assign a volume to an image they can boot and work as the image by default has some disk assigned. By assigning volume (block storage) to an image you get additional drive on the VM where you can have your structural data. Even if you delete the VM, the data on volume is persistent. You can attach the volume to another VM just like an USB drive.

I hope this answers you query

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Asked: 2013-10-08 04:03:28 -0500

Seen: 3,434 times

Last updated: Oct 08 '13