On Mon, Oct 09, 2006 at 11:45:35PM +0100, Ewan Mellor wrote:
> On Mon, Oct 09, 2006 at 06:47:37PM +0100, Daniel P. Berrange wrote:
>
> > With the lifecycle patches, 'xm list' and 'GET /xend/domains' will now
> > include inactive domains as well as active domains. eg
> >
> > # xm list
> > Name ID Mem(MiB) VCPUs State Time(s)
> > Domain-0 0 594 2 r----- 22.2
> > guest3 -1 400 1 ------ 14.7
> >
> > This can cause a slight compatability problem because there has previously
> > been the tacit assumption that "ID" is a unique way to refer to a domain
> > running on a box. With all inactive domains now returning '-1' this is no
> > longer valid. So I think that returning inactive domains by default for
> > commands line 'xm list' or the raw 'GET /xend/domains' may well cause
> > compatability problems for existing users of this command / API.
>
> Note that the domain ID is a unique identifier for the domain, but _not_ a
> unique identifier for a VM. If a VM is migrating to localhost, for example,
> then a given VM may have two different domain IDs.
Ah yes, good point.
> That said, I certainly agree that the change in semantics of the old protocol
> is inappropriate, and I'll put that on the list to be fixed. Your
> proposal for a flag to xm list sounds fine to me also (though I'm
> tempted to word it as "state=Running" rather than "scope=active", to
> reuse the existing VM state mechanisms). Regardless of the details, the
> basic idea is sound, and we'll put that in certainly.
Yeah, 'state' sounds like a better parameter name to me.
> > Finally, I'd also like to see the 'xend_config_version' field for 'xm info'
> > incremented from '2' to '3' to allow clients to easily detect that the XenD
> > they're talking to has this new capability for configs.
>
> Definitely.
Thanks!
Regards,
Dan.
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