Re: [libvirt-users] Collecting system stats
Thanks, I will look into sflow. Is it possible to get some basic info
through libvirt though about the hypervisor without installing additional
software?
I was able to dig around a bit and found conn.GetInfo (where
conn=libvirt.open("qemu:///system")) which gave me some information on
hypervisor memory and cores, nothing on disk though.
I also found out about dom.info() where dom = conn.lookupByID(id) that
gives me information on VM memory and cores. I don't have storage pools
defined, and I am not concerned about them, just need to get total disk
space and available disk space on hypervisor. Perhaps I will have to see
how sflow get's that information through libvirt if at all through libvirt.
I found a 2010 email from *Daniel* P. *Berrange* saying that he believes
system stats should not be part of libvirt, so maybe I can't get that
information from libvirt.
Thanks
On Wed, Sep 25, 2013 at 4:06 PM, Peter Phaal <peter.phaal(a)gmail.com> wrote:
If you need to continuously track libvirt metrics, you might want to
install Host sFlow agents on each of your KVM hypervisors:
http://host-sflow.sourceforge.net/
The Host sFlow agent is a lightweight daemon that links to the libvirt
library on the hypervisor and sends hypervisor and VM metrics using the
sFlow protocol to a central collector. You could use an sFlow analyzer like
Ganglia to record and display the metrics.
http://blog.sflow.com/2012/01/using-ganglia-to-monitor-virtual.html
Alternatively, you could use the sflowtool to convert sFlow to text and
write a Perl/Python/Awk... script to generate your report.
http://blog.sflow.com/2011/12/sflowtool.html
Are you also using Open vSwitch? I you are, the Host sFlow agent can
configure sFlow monitoring to add statistics for each of the vNICs as well
as packet flows between the VMs etc.
http://blog.sflow.com/2010/10/sflowtrend-adds-server-performance.html
On Wed, Sep 25, 2013 at 7:10 AM, Sam Giraffe <sam(a)giraffetech.biz> wrote:
> Hi,
>
> I am trying to create a report across all my KVM hypervisors using
> libvirt API and I need some assistance in figuring out the right API calls.
> My report will contain the total available memory, CPU, disk across all
> hypervisors, versus the amount used by the virtual machines. This report
> will help figure out if we are running low on hypervisor disk, CPU or
> memory and if we need to add more.
>
> I can't find the libvirt API call to get system info, such as total
> memory in the system, free memory, total disk space, available disk space,
> etc. There is virDomainInfo which shows memory total and free about a
> particular VM, I guess I can use active/inactive domain list and then use
> virDomainInfo on each of the VM's, but that does not give me hypervisor
> stats. I am wondering if I will have to enable SNMP and use that to get
> hypervisors stats.
>
> I am creating this report remotely on a reporting machine which will
> connect to each hypervisor using the libvirt API using one of the remote
> libvirt connections available.
>
> Thanks
>
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