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[libvirt-users] error libvirt
by angelo alfano 11 May '10

11 May '10

I have a problem con libvirt, if running this python code: import libvirt conn = libvirt.open("vbox:///session") return this error: libvir: QEMU error : server closed connection libvir: warning : Failed to find the interface: Is the daemon running ? libvir: Remote error : unable to connect to '/var/run/libvirt/libvirt-sock': Connection refused libvir: warning : Failed to find a node driver: Is the libvirtd daemon running ? libvir: Remote error : unable to connect to '/var/run/libvirt/libvirt-sock': Connection refused libvir: warning : Failed to find a secret storage driver: Is the daemon running ? If I running the python code in sudo mode, I don't have error. I have before add the my user at the group "libvirtd" with: sudo adduser user libvirtd Angelo

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[libvirt-users] Volume not found when migrating a VM
by Mathias Tausig 10 May '10

10 May '10

Hello! I want to migrate a machine from one host to another. But upon running migrate drbd01 qemu+tls://192.168.20.2/system in virsh, I get the error message Fehler: cannot open file '/dev/masterGroup/drbd01_system': No such file or directory "/dev/masterGroup/drbd01_system" is the LVM based system volume of the VM to be migrated which is of course available (the machine can be started without any problem). I tried to execute the migrate comman both locally and remote. I am using libvirt 0.8.1 under SLES11. regards Mathias

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[libvirt-users] Error connecting to console
by Anthony Davis 10 May '10

10 May '10

Hi, i have KVM running at the moment and im trying to do a text based install of centos, so i need to connect to the console via virsh virsh console servername but i get this error: error: Failed to get local hostname How do i resolve this issue to get a consol connection to the server? I have tried to put it into the /etc/hosts file, but to no avail. Hope someone can help or suggest another method of doing a headless and X less install of a guest? Kind Regards Tony

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[libvirt-users] How to prevent IP-spoofing/traffic sniffing by the guest machines? (KVM)
by guido 07 May '10

07 May '10

Hi, In a libvirt/KVM setup, what is the best way to prevent untrusted guest machines from (a) sending packets with a sender address different from their own and (b) reading packets not intended for them? Note that guests may have any number of IP addresses they are allowed to use legitimately. Guido

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[libvirt-users] migration using libvirt api
by rahul singh 07 May '10

07 May '10

Hello, I am working on xen hypervisor. I am facing problem in migating vm locally on same system using libvirt api. please help me with some c sample codes. Please send some demo programs or some related help how to migrate a vm locally using libvirt api. Thanking Yuo Rahul Singh

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[libvirt-users] How to prevent IP-spoofing/traffic sniffing by the guest machines?
by guido 07 May '10

07 May '10

Hi, In a libvirt/KVM setup, what is the best way to prevent untrusted guest machines from (a) sending packets with a sender address different from their own and (b) reading packets not intended for them? Note that guests may have any number of IP addresses they are allowed to use legitimately. Guido -- Too much multitasking isn't good for you.

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[libvirt-users] Full documentation for virsh?
by David Ehle 06 May '10

06 May '10

Hello, Does anyone know where full documentation for virsh can be found? Or if the there are any plans to update the man page? The man page lists far fewer commands than virsh lists from its interactive mode when you type help. I noticed this when I was trying to figure out the difference between pool-destroy, and pool-delete. The help entries in the virsh shell are not very informative: virsh # help pool-destroy NAME pool-destroy - destroy a pool SYNOPSIS pool-destroy <pool> DESCRIPTION Destroy a given pool. OPTIONS <pool> pool name or uuid virsh # help pool-delete NAME pool-delete - delete a pool SYNOPSIS pool-delete <pool> DESCRIPTION Delete a given pool. OPTIONS <pool> pool name or uuid ... unless you already know how virsh defines delete vs destroy. (anyone care to explain it to me?) The word pool does not occur in the virsh man page for Ubuntu Karmic release at least. Thanks for the great list!

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[libvirt-users] libvirtd loses all of its data after restart
by guido 06 May '10

06 May '10

Hi, I'm having a problem with libvirtd (backend being kvm) losing its if I restart it with /etc/init.d/libvirtd restart. What I did was: Start libvirtd Connect to it using virsh Create a new storage pool with pool-create-as Create some volumes with vol-create-as Create some virtual machines with create Restart libvirtd using /etc/init.d/libvirtd restart Reconnect with virsh After this, all the previously defined pools, volumes and virtual machines would no longer be listed with pool-list or list, respectively. (list --all doesn't show anything either) The virtual machines I had started earlier are still running and I can still connect to them using vnc, but obviously, I can no longer manage them using libvirt. Why is this happening? Is libvirtd's data not supposed to be persistent? Is this maybe just an old bug? How can I get the still running virtual machines back under control? The system I'm using for this is a recently installed CentOS 5.4 with libvirt-0.6.3-20.1.el5_4 installed directly from its package repository. The only changes I made from the vanilla install was to install and configure some SSL certs in /etc/libvirt/libvirtd.conf, as described on the libvirt website and to enable LIBVIRTD_ARGS="--listen" in /etc/sysconfig/libvirtd. Guido -- Too much multitasking isn't good for you.

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[libvirt-users] weird "no supported architecture for os type 'hvm'"
by Claude Noshpitz 06 May '10

06 May '10

Hi, I have two identical machines with exactly the same CentOS 5.4 kickstarted from the same sources, and the same packages installed. Their cpuinfos are identical, and they are running libvirt 0.6.3 with the very same libvirtd.conf. Yet... One of them works fine, the other says "no supported architecture for os type 'hvm'" for the same template (attached) and image. Any thoughts on what kind of defect or misconfiguration could cause this? Thanks much! --Claude

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[libvirt-users] FYI: Notes on setting up KVM guests using iSCSI
by Daniel P. Berrange 05 May '10

05 May '10

DV suggested that we document some libvirt setups using shared storage. I'm not a fan of NFS, so I wrote some blog posts on how to use iSCSI in the context of libvirt + KVM. There is of course more than one way todo things, so I've outlined a couple of different options. One completely manual command line approach using tgtadm on the iSCSI server: http://berrange.com/posts/2010/05/05/provisioning-kvm-virtual-machines-on-i… ..and virsh/virt-install on the KVM host http://berrange.com/posts/2010/05/05/provisioning-kvm-virtual-machines-on-i… Then one completely GUI based approach, using a QNAP NAS as the iSCSI server http://berrange.com/posts/2010/05/04/provisioning-kvm-virtual-machines-on-i… ..and a virt-manager on the KVM host: http://berrange.com/posts/2010/05/04/provisioning-kvm-virtual-machines-on-i… You can of course mix+match, doing the iSCSI server the manual way and the libvirt bits the GUI way and vica-verca. Any other commercial iSCSI server will have the same concepts so the libvirt instructions apply in all likely scenarios. Regards, Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|

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