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Re: [Libvir] More queries

On Thu, Dec 13, 2007 at 03:35:44PM +0000, Richard W.M. Jones wrote:
> Katti, Vadiraj (STSD-Openview) wrote:
> >Hi,
> >     I've more quries on libvirt apis:
> >	1. Is there any API in libvirt that gives me the uptime of the
> >guets.
> No there isn't, unfortunately.  Best you can do is to tell how much CPU 
> time a guest has used.
> I suspect this information is not available from the Xen hypervisor.  If 
> it is, then we ought to expose it where possible.

It is not available from the HV - the HV has no concept of real world

> >	2. Can I know how many physical CPUs are dedicated to a VM or if
> >they are shared.
> Yes you can tell this by using the terribly complicated 
> 'virDomainGetVcpus' function.  Read the manual page _very_ carefully for 
> this one :-(
> virt-top uses this function to display the % used and mapping of VCPUs 
> to PCPUs in real time, so you might find playing with virt-top and 
> looking at the code useful:
> http://hg.et.redhat.com/virt/applications/virt-top--devel?f=e100f86fdf28;file=virt-top/virt_top.ml
> >	3. How do I know the logical cpu consumption of the guests( from
> >dom0 using libvirt obviously).
> This is sort of possible.  See this page for discussion and limitations 
> of the current API:
> http://et.redhat.com/~rjones/virt-top/faq.html#pcpu
> >	4. Can get the ip address of each of the guests with any of the
> >APIs
> No.  Guests can send out packets from their interface using any IP 
> address they want.  By convention it's normally set up so that guests 
> get an IP address from a DHCP server, but that's only a convention, not 
> required.  Imagine rephrasing the question as "Can I get the IP address 
> of each machine on my LAN?".

And guests can have multiple IP address. They can have IPv4 and IPv6
address. They can even have the same addresses under some scenarios

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