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[libvirt-users] STP default behavior for bridged (off) and NAT (on) networking in libvirt
by Francesco Pretto 18 Apr '10

18 Apr '10

Hello, when talking about networking in hypervisors, it's easy to distinguish the two classic configurations, NAT and bridged, and the official libvirt wiki does exactly in this way here [1]. NAT networking is already configured by libvirt creating a bridge called libvirt0, while bridged networking have to be configured manually by the user. The libvirt0 bridge for NAT networking is default configured in this way: STP=on MAXWAIT=0 While suggested br0 bridge for bridged networking is configured in this way: STP=off MAXWAIT=5 Please, can you explain me why STP is on for NAT and should be off for bridged networking? It seems much easier to me to create loops when using bridged networking than NAT. Moreover, reading this old debian bug about complaints of MAXWAIT != 0 when STP off, I'm wondering if the suggested configurations aren't actually switched. Thanks, Francesco [1] http://wiki.libvirt.org/page/Networking [2] http://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg700924.html

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[libvirt-users] Default network needed?
by Andreas Ntaflos 18 Apr '10

18 Apr '10

Hi list, long(ish) time libvirt users, first time poster. Question: Is the default network (192.168.122.0/24, NAT) created by libvirt needed at all when guests are connected to the host's bridge device (and not the default network) I.e. when I have <interface type='bridge'> <source bridge='br0'/> <model type='virtio'/> </interface> in my guest definition is the default network ever even used? Or can I safely remove it? This may be a naive or stupid question but I have not found a definitive answer studying the documentation. Can anybody enlighten me? Thanks, Andreas -- Andreas Ntaflos GPG Fingerprint: 6234 2E8E 5C81 C6CB E5EC 7E65 397C E2A8 090C A9B4

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[libvirt-users] Libvirtd
by marwen marwen 16 Apr '10

16 Apr '10

hello, I'm using libvirt for my project but i have some problem when we install it (libvirt) can you give me a manual for installation of libvirt and configuration of libvirtd think you so much

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[libvirt-users] from vmdk to kvm
by Valerio Felici 14 Apr '10

14 Apr '10

Hi, I will try to explain my case, I hope this is rigth place to do it. My goal is migrate an Ubuntu 9.10 64bit VMWare VM from a Win2k8 64bit server to an Ubuntu 9.10 64bit server. Following some tutorials I've got a .qcow2 file from .vmdk and a .xml file from .vmx file Running virsh define/start all was fine, but VM is unaccessible: no ping, no ssh, also from hosting server. This is content of .xml file <domain type='kvm'> <name>Ubuntu9.04-Zimbra</name> <uuid>7f86897d-5eac-47d6-970d-c2639d58c340</uuid> <memory>2621440</memory> <currentMemory>2621440</currentMemory> <vcpu>1</vcpu> <os> <type arch='x86_64' machine='pc-0.11'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file' device='disk'> <source file='/opt/Plone/Ubuntu9.04-Zimbra.qcow2'/> <target dev='hda' bus='ide'/> </disk> <interface type='bridge'> <mac address='00:0c:29:82:5c:36'/> <source bridge='br0'/> <model type='virtio'/> </interface> <interface type='bridge'> <mac address='00:0c:29:82:5c:40'/> <source bridge='br0'/> <model type='virtio'/> </interface> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'/> <video> <model type='cirrus' vram='9216' heads='1'/> </video> </devices> </domain> Starting VM, corrisponding on two interfaces declared, vnet1 e vnet2 are showed in ifconfig (vnet0 is for another VM) but "brctl showmacs br0" don't show their MACs What I wrong? Thanks for your attention, sorry if I missing to post some useful data, please tell me, what you need. -- A presto -Valerio-

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[libvirt-users] libvirt: C++ or Java?
by Ganesh Pagade 13 Apr '10

13 Apr '10

Hello, I am planning to develop a management application for managing Redhat Xen and Redhat KVM hypervisors. I am evaluating the Java bindings versus the C++ version of libvirt. As part of evaluation, I could not find meaningful answers to the questions below. Hence, I thought that people on this mailing list would be the most appropriate to comment on them. Can you please let me know your views? 1. Are all functions that are available in C API available in Java? 2. Are Java bindings added along with every enhancement to C API? 3. If answer to above question is negative, typically how long does it takes for the addition of Java bindings for the enhancement? 4. Most of libvirt based third party management applications use which of Java bindings or C API? 5. What are your good/bad experiences while using either of C API or Java bindings? 6. What is your concluding personal recommendation? And finally, since libvirt is a Redhat Emerging Technology project, does Redhat or any other third party service providers provide paid assistance, support? Appreciate your time. Thanks. Regards, Ganesh

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[libvirt-users] virt-top not showing disk and network usage
by Neil Aggarwal 12 Apr '10

12 Apr '10

Hello: I installed virt-top from epel onto my CentOS 5.4 host running KVM. When I run virt-top, it shows me the CPU and memory usage of the VMs, but the disk and network colums are empty. I found this page: http://people.redhat.com/~rjones/virt-top/faq.html That states it depends on what is supported by libvirt and the hypervisor. Is this implemented in KVM? If not, anyone have any info on when it will be? Thanks, Neil -- Neil Aggarwal, (281)846-8957 FREE trial: cPanel VPS with unmetered bandwidth http://UnmeteredVPS.net/cpanel

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[libvirt-users] [libvirt] [LXC] Tyring to locate livbvirt operations for LXC relocation
by Avi Weit 11 Apr '10

11 Apr '10

Hello, I am searching for the libvirt operations for relocating LXC (system or application) containers. LXC relocation mechanism is done by checkpoint / restart. I went over libvirt API documentation and found the following methods: virDomainSave that receives a domain and path to state file. The method saves domain's memory contents into a disk file. virDomainRestore that receives a domain and path to state file. The method restores the domain from the state file created by save operation. Are these the proper methods to use for LXC relocation? I assume I can also use the corresponding operations via virsh (save / restore).. >From looking into lxcDriver object (defined under /src/lxc/xlc_driver.c in libvirt server source) I can see that NULLs are set in save and restore methods. Does that mean that there is no support for saving and restoring Linux containers? Is there a libvirt patch beyond the kernel patch that needs to be applied? I am using libvirt 0.7.5 and kernel 2.6.31 /* Function Tables */ static virDriver lxcDriver = { VIR_DRV_LXC, /* the number virDrvNo */ "LXC", /* the name of the driver */ lxcOpen, /* open */ lxcClose, /* close */ NULL, /* supports_feature */ NULL, /* type */ lxcVersion, /* version */ NULL, /* libvirtVersion (impl. in libvirt.c) */ virGetHostname, /* getHostname */ NULL, /* getMaxVcpus */ nodeGetInfo, /* nodeGetInfo */ lxcGetCapabilities, /* getCapabilities */ lxcListDomains, /* listDomains */ lxcNumDomains, /* numOfDomains */ lxcDomainCreateAndStart, /* domainCreateXML */ lxcDomainLookupByID, /* domainLookupByID */ lxcDomainLookupByUUID, /* domainLookupByUUID */ lxcDomainLookupByName, /* domainLookupByName */ lxcDomainSuspend, /* domainSuspend */ lxcDomainResume, /* domainResume */ lxcDomainShutdown, /* domainShutdown */ NULL, /* domainSave */ NULL, /* domainRestore */ NULL, /* domainMigratePrepare */ NULL, /* domainMigratePerform */ NULL, /* domainMigrateFinish */ ... ... Thanks, - Avi

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[libvirt-users] libvirt: C++ or Java
by Gokhale, Shashibhushan 11 Apr '10

11 Apr '10

Hello, I am planning to develop a management application for managing Redhat Xen and Redhat KVM hypervisors. I am evaluating the Java bindings versus the C++ version of libvirt. As part of evaluation, I could not find meaningful answers to the questions below. Hence, I thought that people on this mailing list would be the most appropriate to comment on them. Can you please let me know your views? 1. Are all functions that are available in C API available in Java? 2. Are Java bindings added along with every enhancement to C API? 3. If answer to above question is negative, typically how long does it takes for the addition of Java bindings for the enhancement? 4. Most of libvirt based third party management applications use which of Java bindings or C API? 5. What are your good/bad experiences while using either of C API or Java bindings? 6. What is your concluding personal recommendation? And finally, since libvirt is a Redhat Emerging Technology project, does Redhat or any other third party service providers provide paid assistance, support? Thanks, Shashi

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Re: [libvirt-users] ESX support
by Aaron Lippold 10 Apr '10

10 Apr '10

Hi Matthias, Sorry for the late reply. I was on travel with limited network access last week. That sounds great, if you need any help or someone to test stuff, please let me know since I am highly interested in helping in any way I can. First question, when I am testing can I use VMWare Workstation on my laptop as a replacement for a full fledged for just testing API and libVirt access? If so I can set that up on my F12 box and start running some tests with libvirt and cobbler. Any new updates on the storage and network efforts? What are the basic requirements that you are going to try to initially hit. I assume there is alway more you could do but what's your 1.0 'good to go' set? Thanks, Aaron On Sun, Mar 21, 2010 at 1:26 PM, Matthias Bolte <matthias.bolte(a)googlemail.com> wrote: > You can manage the power state of a domain (start, stop, suspend, and > resume), you can also define a new domain, undefine existing domains, > migrate domains between hosts and configure CPU and RAM limits of a > domain. > > Two major missing features are currently storage and network > management. This means that you currently cannot use the libvirt > storage and network API to manage the storage and network of an ESX > server. I'm going to address this soon. > > A minor missing feature is editing the virtual hardware configuration > of an existing domain. I'm currently working on this. > > The problem reported by Jonathan Kelley affects ESX 4.0 only. It's not > fixed yet, but I think I can get it fixed for libvirt 0.7.8. I've > withdrawn the first patch fix this issue. A better patch is more > involved, because I need to rework the controller handling internally. > > Documentation about the ESX support can be found at: > http://www.libvirt.org/drvesx.html > > If you have any questions about the ESX support feel free to ask. > > Matthias > > 2010/3/19 Aaron Lippold <lippold(a)gmail.com>: >> Hi, >> >> So google and the mailing list didn't clearly state if we could or >> couldn't create a new vm in a domain on ESX or just turn it on, off, >> restart etc. >> >> Has the XML generation issue been addressed in 0.7.6+? If the docs >> exist, please point me to them and I will be glad to RT*M :). >> >> Thanks, >> >> A >> >> On Fri, Mar 12, 2010 at 4:21 PM, Matthias Bolte >> <matthias.bolte(a)googlemail.com> wrote: >>> 2010/3/9 Jonathan Kelley <jkelley(a)vm-labs.com>: >>>> Just curious but how long has ESX support been in libvirt? >>> >>> Since version 0.7.0 (August 2009). >>> >>>> Also I noticed this error when accessing one of my windows vms: >>>> >>>> error: internal error Expecting VMX entry 'scsi0.virtualDev' to be >>>> 'buslogic' or 'lsilogic' but found 'lsisas1068' >>> >>> I've just posted a patch to add lsisas1068 to the list of known SCSI >>> controller types. >>> >>> Thanks for reporting. >>> >>> Matthias >>> >> >

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[libvirt-users] libvirt, kvm, pxe boot failed
by Frank Matthieß 10 Apr '10

10 Apr '10

Hello all, on my debian squeeze system i have the problem as some others[1] using this combination of libvirt, kvm and qemu. "Cannot boot from non-existent NIC" is the qemu-kvm error message [1] http://www.google.com/search?q=libvirt+Cannot+boot+from+non-existent+NIC&ie… Linux swb20 2.6.30-2-686 #1 SMP Fri Dec 4 00:53:20 UTC 2009 i686 GNU/Linux ii kvm 1:0.12.3+dfsg-4 dummy transitional pacakge from kvm to qemu- ii libvirt-bin 0.7.7-1 the programs for the libvirt library ii libvirt-dev 0.7.7-1 development files for the libvirt library ii libvirt-doc 0.7.7-1 documentation for the libvirt library ii libvirt0 0.7.7-1 library for interfacing with different virtu ii linux-image-2.6.30-2-686 2.6.30-8squeeze1 Linux 2.6.30 image on PPro/Celeron/PII/PIII/ ii python-libvirt 0.7.7-1 libvirt Python bindings ii qemu-kvm 0.12.3+dfsg-4 Full virtualization on x86 hardware Is there any solution right now? Is a solution in preperation? Frank Matthieß. -- Frank Matthieß

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