[libvirt-users] Host information from libvirt KVM/Xen

[Peter Phaal]

If you are primarily interested in collecting statistics, then you
might want to take a look at installing Host sFlow agents on your
hypervisors - Xen, Hyper-V and KVM are supported:

http://host-sflow.sourceforge.net/

The Host sFlow agents export a superset of the metrics you would get
by polling with libvirt, and moving to a push model greatly increases
scaleability of the monitoring system:

http://blog.sflow.com/2012/08/push-vs-pull.html

You can collect the stats using tools like Ganglia and Graphite:

http://blog.sflow.com/2012/01/using-ganglia-to-monitor-virtual.html
http://blog.sflow.com/2012/01/graphite.html

On platforms including Open vSwitch, or on Hyper-V, the Host sFlow
agent can also  provide detailed visibility into inter-VM traffic by
configuring the vSwitch to export standard sFlow metrics:

http://blog.sflow.com/2010/10/sflowtrend-adds-server-performance.html
http://blog.sflow.com/2012/03/windows-server-8-beta.html

The sFlow metrics from the vSwitches are identical to those you would
get from most vendor's physical switches, giving you end-to-end
visibility:

http://blog.sflow.com/2012/09/vendor-support.html

On Thu, Feb 14, 2013 at 3:42 AM, Parakkal, Navin S
<navin.parakkal at hp.com> wrote:
> Hi,
>    Is this not supported for Xen ?  I get something like the below for Xen+ssh .
>
> libvir: error : this function is not supported by the connection driver: virNodeGetCPUStats
> libvir: error : this function is not supported by the connection driver: virNodeGetMemoryStats
>
> Regards,
> Navin
>
> -----Original Message-----
> From: Eric Blake [mailto:eblake at redhat.com]
> Sent: Wednesday, February 13, 2013 7:17 PM
> To: Parakkal, Navin S
> Cc: libvir-list at redhat.com; libvirt-users at redhat.com
> Subject: Re: [libvirt-users] Host information from libvirt KVM/Xen
>
> [no need to mail both libvir-list and libvirt-users; the former is more for development efforts, and since this is a usage question, it is sufficient to mail just libvirt-users]
>
> On 02/13/2013 12:50 AM, Parakkal, Navin S wrote:
>> Hi,
>>    I'm able to get the CPU utilization metrics from libvirt for the guests (VM's) remotely . Is it possible to get the Host Cpu stat's through libvirt ?
>>    I didn't find any information regarding the host cpu cycles and memory utilization to collect them remotely. Libvirt is installed on all the hosts.
>
> You want to use the virNodeGetCPUStats() and virNodeGetMemoryStats() APIs.  In virsh, these are wrapped under 'nodecpustats' and 'nodememstats'.
>
> --
> Eric Blake   eblake redhat com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>
> _______________________________________________
> libvirt-users mailing list
> libvirt-users at redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users