Open Stack

Hi, folks!

In our deployed envs we met with a libvirt error *"missing storage backend
for network files using rbd protocol"* in *virDomainGetBlockInfo* call [1]
<http://paste.openstack.org/show/479237/>
.
This exception is raised when Ceilometer are trying to get info about VM
disk usage and allocation.
It only affects getting measures for a some disk pollsters which added in
this CR [2]
<https://review.openstack.org/#/c/145819/23/ceilometer/compute/virt/libvirt/inspector.py,cm>
 with specified libvirt call [3]
<https://github.com/openstack/ceilometer/blob/stable/liberty/ceilometer/compute/virt/libvirt/inspector.py#L215>
 .
These pollsters have been added in the Kilo cycle and successful work in
Kilo deployments, but it doesn't work now.

Also, we have a bug in the upstream launchpad [4]
<https://bugs.launchpad.net/ceilometer/+bug/1457440>
 but it have not been fixed yet.

I would glad to see any ideas about root cause of this issue or ways to
fixing it.

Thank you in advance!

References:
[1] Traceback <http://paste.openstack.org/show/479237/>


./ceilometer-polling.log.0:4192:2015-11-17 16:20:54.807 14107 ERROR
ceilometer.compute.pollsters.disk Traceback (most recent call last):
./ceilometer-polling.log.0:4193:2015-11-17 16:20:54.807 14107 ERROR
ceilometer.compute.pollsters.disk   File
"/usr/lib/python2.7/dist-packages/ceilometer/compute/pollsters/disk.py",
line 703, in get_samples
./ceilometer-polling.log.0:4194:2015-11-17 16:20:54.807 14107 ERROR
ceilometer.compute.pollsters.disk     instance,
./ceilometer-polling.log.0:4195:2015-11-17 16:20:54.807 14107 ERROR
ceilometer.compute.pollsters.disk   File
"/usr/lib/python2.7/dist-packages/ceilometer/compute/pollsters/disk.py",
line 672, in _populate_cache
./ceilometer-polling.log.0:4196:2015-11-17 16:20:54.807 14107 ERROR
ceilometer.compute.pollsters.disk     for disk, info in disk_info:
./ceilometer-polling.log.0:4197:2015-11-17 16:20:54.807 14107 ERROR
ceilometer.compute.pollsters.disk   File
"/usr/lib/python2.7/dist-packages/ceilometer/compute/virt/libvirt/inspector.py",
line 215, in inspect_disk_info
./ceilometer-polling.log.0:4198:2015-11-17 16:20:54.807 14107 ERROR
ceilometer.compute.pollsters.disk     block_info = domain.blockInfo(device)
./ceilometer-polling.log.0:4199:2015-11-17 16:20:54.807 14107 ERROR
ceilometer.compute.pollsters.disk   File
"/usr/lib/python2.7/dist-packages/libvirt.py", line 658, in blockInfo
./ceilometer-polling.log.0:4200:2015-11-17 16:20:54.807 14107 ERROR
ceilometer.compute.pollsters.disk     if ret is None: raise libvirtError
('virDomainGetBlockInfo() failed', dom=self)
./ceilometer-polling.log.0:4201:2015-11-17 16:20:54.807 14107 ERROR
ceilometer.compute.pollsters.disk libvirtError: internal error: missing
storage backend for network files using rbd protocol

[2] CR with this commit:
https://review.openstack.org/#/c/145819/23/ceilometer/compute/virt/libvirt/inspector.py,cm

[3] Code entry:
https://github.com/openstack/ceilometer/blob/stable/liberty/ceilometer/compute/virt/libvirt/inspector.py#L215
[4] Upstream bug: https://bugs.launchpad.net/ceilometer/+bug/1457440


Best regards,

Tyaptin Il​y​a,

Ceilometer developer,

Mirantis Inc.
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