[one-users] VMs stuck in BOOT, probes consumed all processes

[Javier Fontan]

When you say KVM monitor is it libvirtd?

OpenNebula probes use libvirt to talk to qemu/kvm so the must be seen
with virsh -c qemu:///system command. If this is not the case maybe a
libvirtd restart can fix the problem.

In one 4.6 we have changed this a bit. In 4.4 if there was no
information about a VM before double the monitoting time (20 seconds I
think) then an explicit poll was sent to the host to check about a
single VM, this was using ssh, something like this:

* collectd in the node got stuck
* 40 seconds passed
* an ssh connection plus poll per VM executed, got stuck
* new collectd started with its probes, got stuck again
...

In 4.6 single VM polling is disabled by default. Also there is an
special "probe" that kills any wild collectd, that is, one that
doesn't have the pid in the pid file. This only lets one collectd with
one set of probes running at the same time. Hopefully these changes
alleviate the problem.



On Wed, Jun 11, 2014 at 12:33 PM, Hamada, Ondrej
<ondrej.hamada at acision.com> wrote:
> Hi everyone,
>
> I’ve recently experienced a problem with ONE 4.4: My VMs were getting stuck
> in BOOT stage. I’ve discovered, that KVM monitor died on one node. The VMs
> were still running, but the probes were unable to get any information from
> them. Thus the monitoring of this host’s VMs consumed all processes and it
> became impossible to deploy the VMs.
>
>
>
> Is this a bug or just my misconfiguration?
>
>
>
> Is there a way to set timeout for the probes? I’ve found
> VM_MONITORING_EXPIRATION_TIME, but according to its descriptions it affects
> only the collected information – not the process of collecting them.
>
>
>
> O.Hamada
>
>
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> Users at lists.opennebula.org
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>



-- 
Javier Fontán Muiños
Developer
OpenNebula - Flexible Enterprise Cloud Made Simple
www.OpenNebula.org | @OpenNebula | github.com/jfontan