Quickly run Ubuntu cloud images locally using uvtool

We have long been able to test Ubuntu isos very easily by
using ‘testdrive’. It syncs releases/architectures you are interested
in and starts them in kvm. Very nice. But nowadays, in addition to
the isos, we also distribute cloud images. They are the basis for
cloud instances and ubuntu-cloud containers, but starting a local vm
based on them took some manual steps. Now you can use ‘uvtool’ to
easily sync and launch vms with cloud images.

uvtool is in the archive in trusty and saucy, but if you’re on precise
you’ll need the ppa:

sudo add-apt-repository ppa:uvtool-dev/trunk
sudo apt-get update
sudo apt-get install uvtool

Now you can sync the release you like, using a command like:

uvt-simplestreams-libvirt sync release=saucy
or
uvt-simplestreams-libvirt sync --source http://cloud-images.ubuntu.com/daily release=trusty arch=amd64

See what you’ve got syncd:

uvt-simplestreams-libvirt query

then launch a vm

uvt-kvm create xxx release=saucy arch=amd64
uvt-kvm list

and connect to it

uvt-kvm ssh --insecure -l ubuntu xxx

While it exists you can manage it using libvirt,

virsh list
virsh destroy xxx
virsh start xxx
virsh dumpxml xxx

Doing so, you can find out that the backing store is a qcow snapshot
of the ‘canonical’ image. If you decided you wanted to publish a
resulting vm, you could of course convert the backing store to a
raw file or whatever:

sudo qemu-img convert -f qcow2 -O raw /var/lib/uvtool/libvirt/images/xxx.qcow xxx.img

When you’re done, destroy it using

uvt-kvm destroy xxx

Very nice!

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