[one-users] Patch to monitor network traffic for KVM guests

[Rogier Mars]

Hi,

I've created a quick patch (see below) to the file one_vmm_kvm.rb to  
include proper monitoring of network interface statistics for KVM.
This patch uses the libvirt dumpxml command and domifstat to get  
interface statistics.

I've attached the updated one_vmm_kvm.rb file, see the patch below.

Best regards,

Rogier


42a43
 > require 'rexml/document'
61c62,65
<         :poll     => "virsh --connect #{LIBVIRT_URI} dominfo"
---
 >         :poll     => "virsh --connect #{LIBVIRT_URI} dominfo",
 >         :netstats => "virsh --connect #{LIBVIRT_URI} domifstat",
 >         :dumpxml  => "virsh --connect #{LIBVIRT_URI} dumpxml"
 >
146a151,162
 >         exe2  = SSHCommand.run("#{LIBVIRT[:dumpxml]} #{deploy_id}",  
host,
 >                               log_method(id))
 >
 >        doc = REXML::Document.new(exe2.stdout)
 >        interfaces = []
 >        doc.elements.each('domain/devices/interface/target') do |ele|
 >           interfaces << ele.attributes["dev"]
 >        end
 >
 >         exe3  = SSHCommand.run("#{LIBVIRT[:netstats]} #{deploy_id}  
#{interfaces}", host,
 >                               log_method(id))
 >
182a199
 >
185a203,212
 >         exe3.stdout.each_line {|line|
 >             columns=line.split(" ").collect {|c| c.strip }
 >             case columns[1]
 >                 when 'rx_bytes'
 >                     info << " #{POLL_ATTRIBUTE[:netrx]}="  <<  
(columns[2].to_i).to_s
 >                 when 'tx_bytes'
 >                     info << " #{POLL_ATTRIBUTE[:nettx]}="  <<  
(columns[2].to_i).to_s
 >             end
 > }
 >

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On May 12, 2010, at 1:23 AM, Rogier Mars wrote:

> Hi,
>
> I just noticed this post and did some checking with libvirt. I am  
> able to get the interface that is used in a KVM vm via the dumpxml  
> command, and then get the network interface statistics via domifstat  
> (see the example below). I think this could be included in the  
> one_vmm_kvm.rb script. I'm not a ruby programmer, but I think this  
> should be possible.
>
> Cheers,
>
> Rogier
>
>
> virsh # dumpxml one-60
> <domain type='kvm' id='11'>
>  <name>one-60</name>
>  <uuid>3e62f716-b9bc-4b3e-6af6-7121181a5487</uuid>
>  <memory>524288</memory>
>  <currentMemory>524288</currentMemory>
>  <vcpu>2</vcpu>
>  <os>
>    <type arch='x86_64' machine='pc'>hvm</type>
>    <boot dev='hd'/>
>  </os>
>  <features>
>    <acpi/>
>  </features>
>  <clock offset='utc'/>
>  <on_poweroff>destroy</on_poweroff>
>  <on_reboot>restart</on_reboot>
>  <on_crash>destroy</on_crash>
>  <devices>
>    <emulator>/usr/bin/kvm</emulator>
>    <disk type='file' device='disk'>
>      <source file='/srv/cloud/one/var/60/images/disk.0'/>
>      <target dev='hda' bus='ide'/>
>    </disk>
>    <interface type='bridge'>
>      <mac address='00:03:5d:bc:f9:64'/>
>      <source bridge='br1'/>
>      <target dev='vnet1'/>
>    </interface>
>  </devices>
> </domain>
>
> virsh # domifstat one-60 vnet1
> vnet1 rx_bytes 517120841
> vnet1 rx_packets 6065654
> vnet1 rx_errs 0
> vnet1 rx_drop 0
> vnet1 tx_bytes 189675090
> vnet1 tx_packets 1166682
> vnet1 tx_errs 0
> vnet1 tx_drop 0
>
> virsh #
>
>
> On Jan 7, 2010, at 10:52 AM, Javier Fontan wrote:
>
>> Hello,
>>
>>
>> Hello,
>>
>> Libvirt does not directly provide this information so it is always 0
>> for kvm drivers. Maybe the driver could be improved to get network
>> traffic by other means. Do you have any idea on how this could be
>> done?
>>
>> Bye
>>
>> On Wed, Dec 30, 2009 at 10:18 PM, Shi Jin <jinzishuai at gmail.com>  
>> wrote:
>>> Hi there,
>>>
>>> I noticed that the "onevm show -x" command returns 0 in the XML  
>>> output
>>> <CPU>0</CPU>
>>> <NET_TX>0</NET_TX>
>>> <NET_RX>0</NET_RX>
>>> for all KVM virtual machine. I am not sure whether it is the same  
>>> for Xen.
>>>
>>> Could you please comment on the possibility of monitor network  
>>> traffic
>>> for individual VM in OpenNebula?
>>> I know that the "onehost show" command actually reports the traffic
>>> for each host but what is really interesting is to know exactly how
>>> much traffic used by each VM.
>>>
>>> Thank you very much and Happy New Year to All!
>>>
>>> --
>>> Shi Jin, Ph.D.
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.opennebula.org
>>> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>>
>>
>>
>>
>> -- 
>> Javier Fontan, Grid & Virtualization Technology Engineer/Researcher
>> DSA Research Group: http://dsa-research.org
>> Globus GridWay Metascheduler: http://www.GridWay.org
>> OpenNebula Virtual Infrastructure Engine: http://www.OpenNebula.org
>> _______________________________________________
>> Users mailing list
>> Users at lists.opennebula.org
>> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>
>
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