libvirt users - Jan 2012 - Libvirt API for C/C++ : Monitoring Support

Greetings,
 
I am a developer, trying to develop a system for monitoring Servers and Virtual
Machines using Libvirt API for C/C++. I am facing an issue that there are no
functions for monitoring some parameters which I have listed below. I would like
to know if there is any there way I can retrieve these parameters since they are
critical to my Monitoring Application. Also I am using CentOS 5.6 as a
development machine which only supports up to libvirt-devel package version
0.8.2 due to which I am unable to use the newer development binaries (which are
only built for newer RedHat kernels) which have support for certain functions
that do not work on the one I am using.
 
List of parameters:
 
For Server Monitoring:
1. Memory Swap-In
2. Memory swap-Out
3. Disk Usage
4. Disk Read
5. Disk write
6. Disk Total Read Latency
7. Disk total Write Latency
8. Network Usage
9. Network Packets Received
10. Network Packets Sent
11. CPU utilization
12. CPU Usage
 
For Virtual Machine Monitoring:
1. Memory Utilization
2. Memory Consumption
3. Memory swap-In
4. Memory Swap-Out
5. Disk Usage
6. Disk Read
7. Disk Write
8. Disk Total Read Latency
9. Disk total write Latency
10. Network Usage
11. Network Packets Received
12. Network Packets Transmitted
13. CPU utilization
14. CPU Usage
 
Regards,
Pratik.

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On 01/12/2012 12:04 AM, pratik.patel at snstech.com
wrote:
> 
> Greetings,
>  
> I am a developer, trying to develop a system for monitoring Servers and
Virtual Machines using Libvirt API for C/C++. I am facing an issue that there
are no functions for monitoring some parameters which I have listed below. I
would like to know if there is any there way I can retrieve these parameters
since they are critical to my Monitoring Application. Also I am using CentOS 5.6
as a development machine which only supports up to libvirt-devel package version
0.8.2 due to which I am unable to use the newer development binaries (which are
only built for newer RedHat kernels) which have support for certain functions
that do not work on the one I am using.
Alas, you will have to upgrade to newer qemu and libvirt before you can
get at these values.  Some pieces of information are available if you
don't upgrade, but you are crippling your efforts if you don't upgrade.
>  
> List of parameters:
>  
> For Server Monitoring:
> 1. Memory Swap-In
> 2. Memory swap-Out
I'm not sure if these are yet exposed in libvirt 0.9.9, but it would be
reasonable to add them to virNodeGetMemoryStats.
> 3. Disk Usage
This one should be available for you, under virDomainGetBlockInfo
> 4. Disk Read
> 5. Disk write
These should be available under virDomainBlockStats[Flags], and
> 6. Disk Total Read Latency
> 7. Disk total Write Latency
I'm not sure if virDomainBlockStatsFlags and
VIR_DOMAIN_BLOCK_STATS_READ_TOTAL_TIMES quite matches what you are
looking for; then again, total time spend on reads can probably get you
pretty close to calculating latency.
> 8. Network Usage
> 9. Network Packets Received
> 10. Network Packets Sent
virDomainInterfaceStats should be available for you
> 11. CPU utilization
> 12. CPU Usage
There's a proposal to add these; it should be in by 0.9.10...
https://www.redhat.com/archives/libvir-list/2012-January/msg00106.html
>  
> For Virtual Machine Monitoring:
> 1. Memory Utilization
> 2. Memory Consumption
> 3. Memory swap-In
> 4. Memory Swap-Out
Hmm, you make it sound like you want stats on both the host and on each
domain running on the host.  Again, many of these stats are already
available, and the things that aren't would be reasonable additions if
you don't mind contributing patches.
> 5. Disk Usage
> 6. Disk Read
> 7. Disk Write
> 8. Disk Total Read Latency
> 9. Disk total write Latency
> 10. Network Usage
> 11. Network Packets Received
> 12. Network Packets Transmitted
> 13. CPU utilization
> 14. CPU Usage
>  
-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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