<div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Fri, Dec 16, 2016 at 3:35 PM Steve Gordon <<a href="mailto:sgordon@redhat.com">sgordon@redhat.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br class="gmail_msg">
<br class="gmail_msg">
----- Original Message -----<br class="gmail_msg">
> From: "Neil Jerram" <<a href="mailto:neil@tigera.io" class="gmail_msg" target="_blank">neil@tigera.io</a>><br class="gmail_msg">
> To: "OpenStack Development Mailing List (not for usage questions)" <<a href="mailto:openstack-dev@lists.openstack.org" class="gmail_msg" target="_blank">openstack-dev@lists.openstack.org</a>><br class="gmail_msg">
> Sent: Friday, December 16, 2016 6:40:57 AM<br class="gmail_msg">
> Subject: [openstack-dev] Issues with libvirt transition 1.2.7 -> 2.0.0 (CentOS 7.3)<br class="gmail_msg">
><br class="gmail_msg">
> I appreciate that even libvirt 2.0.0 will be ancient history by now, to its<br class="gmail_msg">
> developers, but I am seeing further issues that look associated with the<br class="gmail_msg">
> recent CentOS 7 transition from libvirt 1.2.7 to libvirt 2.0.0, and would<br class="gmail_msg">
> appreciate any comments on them that people may have. I believe these<br class="gmail_msg">
> issues are independent of those that have already been discussed on other<br class="gmail_msg">
> threads.<br class="gmail_msg">
><br class="gmail_msg">
> First, this traceback in nova-compute.log:<br class="gmail_msg">
><br class="gmail_msg">
> Traceback (most recent call last):<br class="gmail_msg">
> File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line<br class="gmail_msg">
> 2156, in _build_resources<br class="gmail_msg">
> yield resources<br class="gmail_msg">
> File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line<br class="gmail_msg">
> 2009, in _build_and_run_instance<br class="gmail_msg">
> block_device_info=block_device_info)<br class="gmail_msg">
> File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line<br class="gmail_msg">
> 2534, in spawn<br class="gmail_msg">
> block_device_info=block_device_info)<br class="gmail_msg">
> File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line<br class="gmail_msg">
> 4620, in _create_domain_and_network<br class="gmail_msg">
> xml, pause=pause, power_on=power_on)<br class="gmail_msg">
> File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line<br class="gmail_msg">
> 4550, in _create_domain<br class="gmail_msg">
> guest.launch(pause=pause)<br class="gmail_msg">
> File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/guest.py", line<br class="gmail_msg">
> 142, in launch<br class="gmail_msg">
> self._encoded_xml, errors='ignore')<br class="gmail_msg">
> File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 195,<br class="gmail_msg">
> in __exit__<br class="gmail_msg">
> six.reraise(self.type_, self.value, self.tb)<br class="gmail_msg">
> File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/guest.py", line<br class="gmail_msg">
> 137, in launch<br class="gmail_msg">
> return self._domain.createWithFlags(flags)<br class="gmail_msg">
> File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 186, in<br class="gmail_msg">
> doit<br class="gmail_msg">
> result = proxy_call(self._autowrap, f, *args, **kwargs)<br class="gmail_msg">
> File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 144, in<br class="gmail_msg">
> proxy_call<br class="gmail_msg">
> rv = execute(f, *args, **kwargs)<br class="gmail_msg">
> File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 125, in<br class="gmail_msg">
> execute<br class="gmail_msg">
> six.reraise(c, e, tb)<br class="gmail_msg">
> File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 83, in<br class="gmail_msg">
> tworker<br class="gmail_msg">
> rv = meth(*args, **kwargs)<br class="gmail_msg">
> File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1065, in<br class="gmail_msg">
> createWithFlags<br class="gmail_msg">
> if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed',<br class="gmail_msg">
> dom=self)<br class="gmail_msg">
> libvirtError: Cannot find '' in path: No such file or directory<br class="gmail_msg">
><br class="gmail_msg">
> which I believe is caused by the empty path attribute in this part of the<br class="gmail_msg">
> XML:<br class="gmail_msg">
><br class="gmail_msg">
> <interface type='ethernet'><br class="gmail_msg">
> <mac address='fa:16:3e:3c:96:33'/><br class="gmail_msg">
> <script path=''/><br class="gmail_msg">
> <target dev='tap06992dfb-5d'/><br class="gmail_msg">
> <model type='virtio'/><br class="gmail_msg">
> <driver name='qemu'/><br class="gmail_msg">
> <address type='pci' domain='0x0000' bus='0x00' slot='0x03'<br class="gmail_msg">
> function='0x0'/><br class="gmail_msg">
> </interface><br class="gmail_msg">
><br class="gmail_msg">
> which is in turn caused, I think, by<br class="gmail_msg">
> <a href="https://github.com/openstack/nova/blob/master/nova/virt/libvirt/designer.py#L61" rel="noreferrer" class="gmail_msg" target="_blank">https://github.com/openstack/nova/blob/master/nova/virt/libvirt/designer.py#L61</a><br class="gmail_msg">
><br class="gmail_msg">
> Is it plausible that libvirt 1.2.7 would have avoided trying to invoke a<br class="gmail_msg">
> script with an empty path, whereas libvirt 2.0.0 does not?<br class="gmail_msg">
><br class="gmail_msg">
> Secondly - if I move past the problem above by changing<br class="gmail_msg">
> <a href="https://github.com/openstack/nova/blob/master/nova/virt/libvirt/designer.py#L61" rel="noreferrer" class="gmail_msg" target="_blank">https://github.com/openstack/nova/blob/master/nova/virt/libvirt/designer.py#L61</a><br class="gmail_msg">
> to say 'conf.script = None' - I then find:<br class="gmail_msg">
> - no apparent error in nova-compute.log<br class="gmail_msg">
> - but my instances don't boot<br class="gmail_msg">
> - the following messages in the libvirt log:<br class="gmail_msg">
><br class="gmail_msg">
> Domain id=4 is tainted: high-privileges<br class="gmail_msg">
> char device redirected to /dev/pts/1 (label charserial1)<br class="gmail_msg">
> CPU feature tsc_adjust not found<br class="gmail_msg">
><br class="gmail_msg">
> I guess it's the last message that is the critical one here - can anyone<br class="gmail_msg">
> tell me more about it?<br class="gmail_msg">
<br class="gmail_msg">
Hi Neil,<br class="gmail_msg">
<br class="gmail_msg">
The second seems likely to be related to the addition of support for VMX TSC scaling. What version of qemu are you running?</blockquote><div><br></div><div>Thanks for your reply, Steve. I have these qemu packages installed:<br><br>[root@neil-fv-0-centos-liberty-compute-node01 qemu]# yum list installed | grep qemu<br>ipxe-roms-qemu.noarch 20160127-5.git6366fa7a.el7<br>libvirt-daemon-driver-qemu.x86_64 2.0.0-10.el7_3.2 @updates <br>qemu-img.x86_64 10:1.5.3-126.el7 @base <br>qemu-kvm.x86_64 10:1.5.3-126.el7 @base <br>qemu-kvm-common.x86_64 10:1.5.3-126.el7 @base <br><br>I should probably also mention that I'm using virt_type = qemu, because my compute nodes are GCE instances.<br><br>[root@neil-fv-0-centos-liberty-compute-node01 qemu]# cat /etc/nova/nova-compute.conf <br>[libvirt]<br>virt_type = qemu<br><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">If you haven't already I would suggest grabbing qemu-kvm-ev from the CentOS Virt SIG repos:<br class="gmail_msg">
<br class="gmail_msg">
<a href="http://mirror.centos.org/centos/7/virt/x86_64/kvm-common/" rel="noreferrer" class="gmail_msg" target="_blank">http://mirror.centos.org/centos/7/virt/x86_64/kvm-common/</a><br class="gmail_msg">
<br class="gmail_msg">
You can enable the repository using this release RPM:<br class="gmail_msg">
<br class="gmail_msg">
<a href="http://mirror.centos.org/centos/7/virt/x86_64/kvm-common/centos-release-qemu-ev-1.0-1.el7.noarch.rpm" rel="noreferrer" class="gmail_msg" target="_blank">http://mirror.centos.org/centos/7/virt/x86_64/kvm-common/centos-release-qemu-ev-1.0-1.el7.noarch.rpm</a><br class="gmail_msg">
<br class="gmail_msg"></blockquote><div><br></div><div>Would you expect that to help with virt_type = qemu (as well as with virt_type = kvm, which I assume is the more common setting)? If so I'll be very excited to try this!<br> <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Thanks,<br class="gmail_msg">
<br class="gmail_msg">
Steve<br class="gmail_msg"></blockquote><div><br></div><div>Thanks - Neil<br><br></div></div></div>