September 2011 - Users - libvirt List Archives

[libvirt-users] Config Errro when Creating a virtual device attachment to backend
by huachao yao 15 Sep '11

15 Sep '11

Hi, buddy, I want to create a virtual device attachment to backend. The domain is running, and my code phase is as below: xmlConfiguration = "<devices><sound model='es1370'/></devices>"; virDomainAttachDevice(dom,xmlConfiguration); But the exception "libvir: Domain Config error : XML error: unknown device type " happen when running. Is it something wrong in the XML configuration? What should i do to deal with such Config error ? ps: the hypervisor is KVM.

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Re: [libvirt-users] Libvirt daemon usage question
by Eric Blake 14 Sep '11

14 Sep '11

[let's keep the list in the loop] On 09/14/2011 04:07 PM, Trey Dockendorf wrote: >> Given your original qeustion, if your management apps really do require > 0.8.8 APIs, then you'll need to upgrade libvirtd on your CentOS host to be > at least 0.8.8 in order to honor your management app requests, or else > modify your management app to gracefully implement fallbacks to older API > approaches that were available in 0.8.1. >> > > How risky is it to implement a newer version of libvirt in something like > centos? I figure based on the huge number of dependencies that its not > something to safely do. So far we building my libvirt rpms Ive only used > the same source for the version with centos and the libvirt specs provided > in the fedora src rpms. Do the specs know to check for specific versions of > dependencies? There's not that many source dependencies for building a newer libvirt out-of-the-box on top of CentOS. You might also find https://fedoraproject.org/wiki/Virtualization_Preview_Repository as a useful example for the amount of effort involved in running newer virt tools on top of an otherwise stable repository. Also, search the list archives; the topic of installing the latest libvirt on CentOS or RHEL 5 has come up several times recently, with various tidbits of good advice. -- Eric Blake eblake(a)redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org

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[libvirt-users] Libvirt daemon usage question
by Trey Dockendorf 14 Sep '11

14 Sep '11

I could use some help with clarification on the use of the libvirtd daemon with regards to managing remote KVM instances. Right now I have a CentOS 6 KVM server (libvirt-0.8.1), but would like to use some management applications that require higher version (0.8.8). First, is it possible to run the libvirtd daemon from within a VM, or does it require active kvm kernel module? Secondly, could a daemon running in say Fedora 15 (0.8.8) be used to communicate with my CentOS 6 daemon (0.8.1). Does this sort of model present a problem if the KVM host is not using the same or close to the same version as the remote libvirtd? My understanding of how to use libvirtd remotely is a bit weak, so any clarification would be greatly appreciated. Thanks - Trey

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[libvirt-users] How to install libvirt 0.9.4 RPM on Fedora 14?
by Guido Winkelmann 14 Sep '11

14 Sep '11

Hi, I'm trying to install the newest version of libvirt and libvirt-client from the rpms at ftp://libvirt.org/libvirt/ on a Fedora 14 machine. The naming of the rpms as "libvirt-0.9.4-1.fc14.x86_64.rpm" suggests that this is exactly the system this was made for, however, installation still does not go smoothly. When I try to install these packages with yum install libvirt-client-0.9.4-1.fc14.x86_64.rpm \ libvirt-0.9.4-1.fc14.x86_64.rpm , some of the dependencies get resolved automatically, but not all of them, and I get these error messages: Error: Package: libvirt-0.9.4-1.fc14.x86_64 (/libvirt-0.9.4-1.fc14.x86_64) Requires: libblktapctl.so.1.0()(64bit) Error: Package: libvirt-client-0.9.4-1.fc14.x86_64 (/libvirt- client-0.9.4-1.fc14.x86_64) Requires: libnetcf.so.1(NETCF_1.4.0)(64bit) Error: Package: libvirt-0.9.4-1.fc14.x86_64 (/libvirt-0.9.4-1.fc14.x86_64) Requires: libnetcf.so.1(NETCF_1.4.0)(64bit) Apparently, I need newer versions of netcf-libs and xen-libs. Where do I get these from? There don't appear to be any official rpms or that for Fedora 14... Regards, Guido

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[libvirt-users] using virsh (or something) to convert from KVM domain XML to vmx...
by Frank Hauptle 14 Sep '11

14 Sep '11

HI folks, For reasons I'd rather not go into (not my choice) we are moving our current virtual servers at the uni here, (using KVM and libvirt) to outsourced vmware ESX and vcenter. I really don't want to use the Vcenter Converter to create running esx vm's from within the KVM VM's as I feel that doing it within the client VM is inefficient and slow. Thus far however, I've not found anything that gives me any other alternatives. I thought perhaps the domxml-to-native virsh function demo'd at http://libvirt.org/drvesx.html#xmlexport would be the go, but that appears to be just a way to change from libvirt managed esx to native vmx. Converting the KVM raw img files to vmdk has been easy, converting the KVM domain XML to vmx appears to be impossible unless you do it by hand. Have I missed some cool/feature that would do this? Apologies if I'm going about this all wrong, What I know about vmware, I could write on the head of a pin with a felt tip pen.. kindest regards Frank UWA

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[libvirt-users] cpu time totals
by Igor Serebryany 13 Sep '11

13 Sep '11

Hi! I'm comparing the cpu usage of a VM from virDomainGetInfo and the usages returned per-vcpu from virDomainGetVcpus and the totals do not match up. I expect that the cpu usages reported per-vcpu, when summed, should equal the total cpu usage of the domain, but there is quite a large gap between them. Is there something I'm missing? See this example code using the python bindings: >>> import libvirt >>> c = libvirt.open('qemu:///system') >>> d = c.lookupByID(51) >>> d.info()[4] 111390000000L >>> d.vcpus()[0] [(0, 1, 12720000000L, 1), (1, 1, 2980000000L, 0), (2, 1, 3150000000L, 1), (3, 1, 2600000000L, 0)] >>> sum([vcpu[2] for vcpu in d.vcpus()[0]]) 21520000000L >>> d.info()[4] - sum([vcpu[2] for vcpu in d.vcpus()[0]]) 91760000000L Why is this additional 91 seconds not reflected in time spent by the vcpus? What exactly is the meaning of the cpuTime parameter of the virVcpuInfo struct? Thanks, --Igor

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[libvirt-users] Reg: Difference between chroot & pivot_root
by Alphonse Hansel Anthony 13 Sep '11

13 Sep '11

Hi, What is the difference between chroot & pivot_root. They don't seem obvious based on the man pages apart from the below mentioned caveats. 1) Inherited Open file descriptors, have to be explicitly closed. 2) Does not change CWD of the process, which can be overcome by doing a chdir before & after chroot call. Any information on this would be useful. Thanks, Alphonse

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[libvirt-users] Reg: VETH Device pair creation using iproute2.
by Alphonse Hansel Anthony 13 Sep '11

13 Sep '11

Hi, While using libvirt to start a LXC, I am facing an error related to NETNS, specifically related to the VETH device pair creation. The code related to this is present in libvirt/src/lxc/veth.c # ip link add veth0 type veth peer name veth1 Garbage instead of arguments "peer ...". Try "ip link help". # ip -V ip utility, iproute2-ss110629 # uname -r 2.6.32.39 # The devices "veth0" & "veth1" does not exist in /sys/class/net/ But the same command works with iproute2-ss100519 (older version). Is this a known issue in the latest version or am I doing something wrong? Any info in this regard would be useful. -Alphonse

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Re: [libvirt-users] Fwd: Re: [libvirt] how did libvirt manage Virtual Network?
by Wayne Xia 13 Sep '11

13 Sep '11

Thank u very much, it helps a lot. 于 2011-9-13 10:22, Lei Li 写道: > > > -------- Original Message -------- > Subject: Re: [libvirt] how did libvirt manage Virtual Network? > Date: Fri, 09 Sep 2011 12:28:38 -0400 > From: Laine Stump <laine(a)laine.org> <mailto:laine@laine.org> > To: libvirt-users(a)redhat.com <mailto:libvirt-users@redhat.com> > CC: libvir-list(a)redhat.com <mailto:libvir-list@redhat.com> > > > > (This seems more appropriate for the libvirt-users mailing list) > > On 09/08/2011 10:16 PM, Wayne Xia wrote: >> Working at the network management, I am a bit confused about the >> VLAN model in libvirt. >> >> in the xml definition, there is a section as following: >> >> <devices> >> <interface type='network'> >> <source network='default'/> >> </interface> >> ... >> <interface type='network'> >> <source network='default' portgroup='engineering'/> >> <target dev='vnet7'/> >> <mac address="00:11:22:33:44:55"/> >> <virtualport type='802.1Qbg'> >> <parameters managerid='11' typeid='1193047' typeidversion='2' >> instanceid='09b11c53-8b5c-4eeb-8f00-d84eaa0aaa4f'/> >> </virtualport> >> >> </interface> >> </devices> >> >> >> What is the really meaning of its related parameters of >> "virtualport"? I want to discover informations such as VLAN id, >> the switch type( software switch or hardware switch), connecting >> relationship, but from the xml I can only found"managerid". I am not >> sure how to map these xml information to those I needed, could I >> consider managerid as VLAN id, and a portgroup as a specified VLAN group? >> By the way to use virtualport, what components should I install on >> Linux? > > <virtualport> is used only when configuring guests that connect directly > to a VEPA or VNLINK (i.e. 802.1Q) capable switch. Unless you have one of > these switches, you will not use it. If you do have one of these > switches, you will also have information included with them that > explains the meaning of the virtualport parameters and how they are used > (they're opaque to libvirt - it just passes them on to the switch > without assigning any meaning to them). > > portgroup is a tag used to select certain bits of config out of > <portgroup> sections in the<network> definition being used for the > interface. Currently the things that can be configured in the > <portgroup> sections are 1)<bandwidth> info, and 2)<virtualport> > parameters. Again, it has nothing to do with VLAN groups.<portgroup> is > very new, btw - it has only been in libvirt since 0.9.4, so if you're > using an older version don't expect it to do anything. > > Down to the real basic question of which VLAN a particular guest is > using - that can either be determined by the guest itself, or if the > guest has no VLAN id setting, it could be determined by the > switch/bridge the guest is connected to; in other words, wherever it is > done, it's outside of libvirt (well, I guess if your platform has > support for the iface-* commands, you could define a bridge that uses a > vlan interface as its connection to the physical network - then traffic > from any guest connected to that bridge would end up going onto the > physical network with the given vlan id). > > -- > libvir-list mailing list > libvir-list(a)redhat.com <mailto:libvir-list@redhat.com> > https://www.redhat.com/mailman/listinfo/libvir-list > -- Best Regards Wayne Xia mail:xiawenc@linux.vnet.ibm.com tel:86-010-82450803

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[libvirt-users] Updating librvirt on the STD Distros
by KB 12 Sep '11

12 Sep '11

All, This is my first time posting, I apologize in advance if it is too much of a "newbie" question I am working on a project with libvirt and want to use some of the features in the 0.9.4 release. The first platform I wanted to test this on is RHEL 5.7. I have d/l libvirt and compiled but have the following questions 1) RHEL 5.7 ships with libvirt version, 0.8.2-22. I am guessing that I can not simple overwrite the existing files with the files from 0.9.4. Is there a way to upgrade to 0.9.4? Do I need to build an rpm so that the version is properly reported in the rpm db? I am also guessing some of the other packages the rely on libvirt may no longer work. In addition, I would imagine RH does not support doing this. To summarize, can the lbivrit on RHEL be upgraded and if so does anyone have any info they can point me to? 2) If there is not a way to update RHEL, is there a different distro CentOS, Ubuntu, Fedora that is a better choice to test my project on? 3) I am also guessing if my project is using API's that are not in 0.8.2-22 but are in 0.9.4., I will not be able to connect remotely to the RHEL server and have them pull the data correctly. For example, I want to use virDomainGetMemoryParameters. Thanks in advance. Keith

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