Hi,
I'm facing a problem where I need to monitor the availability of a number of qemu-kvm processes (virtual machines) in Linux.
Normally you can gather statistics by for example defining: Process.CPUTime(qemu-kvm) but what if I have a number of qemu-kvm processes that I'd like to monitor individually? The only way to tell the processes a part is by --name XXXX attribute, which states the virtual machines name and/or id.
I guess the ideal scenario would be to setup the monitoring and DCI collection on a cluster-object and associate all the qemu-kvm hosts underneath it, then the monitoring and the stats would keep collecting even if a virtual machine is migrate to a different host. But my problem is that I can't filter running processes by attributes, or at least, I haven't found out how...
Hopefully someone can give me a hint in which way to go, thanks!
Anders
Hi!
You can specify command line filter in all Process.* parameters. Full syntax of Process.CPUTime (and others Process.*) is following:
Process.CPUTime(
process,
type,
cmdline)
Where
process - process name. If
cmdline is not given, only processes with matched name will be counted and read. If
cmdline is given,
process interpreted as regular expression.
type - representation type (meaningful when more than one process with the same name exists). Valid values are:
min - minimal value among all processes named <process>
max - maximal value among all processes named <process>
avg - average value for all processes named <process>
sum - sum of values for all processes named <process>
cmdline - command line (regular expression to match).
So to match all processes named qemu-kvm with word test in command line, you can use
Process.CPUTime(^qemu-kvm$, sum, test)
Don't forget that both process name and command line are regular expressions when extended format is used, so if you use "qemu-kvm" as process name (without ^ and $), processes contained this in the name (like qemu-kvm2) will also be matched.
Best regards,
Victor
Great news, thank you Victor! Does the Process.Count() work in a similar way?
Btw, what is the most up to date source for reference information for all supported attributes for a command such as: Process.Count() or Process.CPUTime() ? I haven't been able to find any related information in the wiki.
For counting processes there are separate parameter Process.CountEx, which has two arguments - process name and command line, both are regular expressions.
Wiki is supposed to be most up-to-date information source, but unfortunately it still missing lot of information, including detailed description of agent parameters. We are updating wiki, but it's a slow process.
Best regards,
Victor
Hi, I am also working on qemu.
I want to get all active qemu processes running on host.
I tried using 'top | grep qemu' , i got all qemu processes.
But when I migrate a VM from hostA to hostB , I can still find its entry on hostA.
Did you come across this? Please help.
Hi mrugani,
This sounds more of an Qemu related question than NetXMS related, but I'll give it a try.
Are you using some sort of management wrapper such as: libvirt (http://libvirt.org/) (virsh) or similar to manage your virtual machines? or are you using the native Qemu-monitor to migrate your virtual machines?