Re: [Libguestfs] OpenStack output - server_id

On Mon, Sep 24, 2018 at 10:00:21AM +0200, Fabien Dupont wrote: > Hi, Hi Fabien, sorry I didn't respond to this earlier as I was doing some work. If you CC me on emails then you can usually get a quicker response. > I've read the virt-v2v OpenStack output code to understand how it works and > I've seen this: > > > (* The server name or UUID of the conversion appliance where > > * virt-v2v is currently running. In future we may be able > > * to make this optional and derive it from the OpenStack > > * metadata service instead. > > *) > > server_id : string; > > Indeed, it can be derived from OpenStack metadata service. The following > URL called from within the conversion appliance will return the metadata: > http://169.254.169.254/openstack/latest/meta_data.json. As you can see, the > IP address is 169.254.169.254, which will is the metadata service. The JSON > body contains a uuid entry that is the current appliance UUID, hence the > server_id used by virt-v2v. We certainly do want to do this, although there was some concern about whether the metadata service is enabled on every OpenStack instance out there. (Also there are two different types of metadata service IIRC?)

(Unfortunately the connection hung for minutes instead of timing out quickly, which is not great.)