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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