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[libvirt-users] Live blockcopy onto storage pool that is an NFS mount?
by Andrew Martin 08 Aug '14

08 Aug '14

Hello, I am running qemu-kvm 1.4.0 and libvirt 1.0.2 on Ubuntu 12.04. I have two NFS mountpoints configured as two separate pools in virsh: <pool type='dir'> <name>nfs1</name> <uuid>419d799c-2493-6ebc-6848-53b0919e7bad</uuid> <capacity unit='bytes'>6836057014272</capacity> <allocation unit='bytes'>0</allocation> <available unit='bytes'>6836057014272</available> <source> </source> <target> <path>/var/lib/libvirt/images/nfs1</path> <permissions> <mode>0711</mode> <owner>0</owner> <group>0</group> </permissions> </target> </pool> The XML for the nfs2 pool is similar, with the mountpoint being /var/lib/libvirt/images/nfs2. I would like to be able to move the VM disk from one of the NFS mountpoints to another (nfs1 --> nfs2) live. I followed the instructions here: http://thr3ads.net/libvirt-users/2013/02/2174486-Migrate-VMs-to-different-s… However when I attempt the blockcopy command, I receive this error: Failed to create file '/var/lib/libvirt/images/nfs2/vm.qcow2': Operation not permitted Is it not possible to blockcopy in this way to an NFS mount? Thanks, Andrew

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[libvirt-users] File permissions on VNC unix sockets
by Landon Gilbert-Bland 07 Aug '14

07 Aug '14

I am using kvm libvirt/qemu, and am trying to get VNC working with unix sockets. I'm using the following in my XML: <graphics type='vnc' socket='/tmp/kvmtest'/> This works, it creates the unix socket and I can use it for VNC. But it creates the socket with 755 permissions, and owned by libvirt-qemu:kvm. Ideally, I would like it to be 770 root:libvirtd, but could also work with 775 libvirt-qemu:kvm. Basically, I would like the group to be read/write/execute, so that anyone in this group can use virt-manager (or whatever) to get into the vm with vnc. I haven't found a way to change this in the settins. It doesn't seem to be honoring the unix socket settings in /etc/libvirt/libvirdd.conf (it looks like those are only for libvirt-sock and libvirt-sock-ro), and I haven't been able to find any documentation about changing these permissions in the XML. I can manually chmod/chown the socket after it is created (manually or with a cron), but that is far from an ideal solution. I don't suppose anyone has run across a configuration option for this that I have missed? I have only tested this in ubuntu 14.04.1 and debian testing, for what it's worth. Thanks, --landon

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[libvirt-users] Understanding Libvirt Java API in order to get CPU usage of a VM
by Restituto Marcus Arevalo 07 Aug '14

07 Aug '14

I'm having a problemin understanding the Libvirt Java API. Here is my sourcein reading some of the classes: http://libvirt.org/sources/java/javadoc/ I have no idea where to start in order for me to get the CPU usage. Can anybody help? Or at least give me some points on where to start in order for me to get the CPU usage of a VM in KVM? Any suggestions will really help. Thanks regards, Marco

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[libvirt-users] [help] Does "virsh blockpull" works on live virtual machine
by chenyanqiu＠keytonecloud.com 07 Aug '14

07 Aug '14

Hi all, I have a kvm virtual machine running (qemu version 2.0), and I had took several external snapshots of the disk( using "virsh snapshot-create-as"). Now, the existed disk files relationship look like: base <- snap1 <-snap2 <- current using disk file. Now I want to remove snap1 and snap2, and let current disk using the base image file as back file directly. Unfortunately, for some reason, I can not shutdown the vm, and exectue the "virsh blockpull" command. Can I execute the "virsh blockpull" while the vm is power on, and the application in the vm is not affected? Thanks very much! Daniel

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[libvirt-users] possible to dynamically set/add network domain name?
by Rich Megginson 06 Aug '14

06 Aug '14

trying to use virsh net-update to add a domain name libvirt-1.1.3.5-2.fc20.x86_64 sudo virsh net-update default add domain "<domain name='test'/>" --live --config error: this function is not supported by the connection driver: can't update 'domain' section of network 'default' is it possible to add a domain using net-update?

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[libvirt-users] username and passwd after create VM from XML dump
by Yuanzhen Gu 06 Aug '14

06 Aug '14

Good afternoon guys, I created the VM from XML dump, # virsh create vm4.xml and # virsh list I can see the VM running, and I know the ip address for the VM, but how can I know the username and password to login the running VM, which is created from XML dump? is there any place to edit and add the username and password in guest domain XML ? thanks a lot!! Best, Yuanzhen

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[libvirt-users] Ubuntu Trusty: failed to create VM due to permission denied
by Jianfeng Tang 06 Aug '14

06 Aug '14

> Hi, libvirt experts, I used libvirt to create a VM and used backing store to a local file. It works fine until I installed my box to Unbuntu Trusty (14.04). I got the following errors when I tried to start the VM: Could not open backing file: Could not open <path to my backing file>: Permission denied However, if I moved my image file (not base image) to default location /var/lib/libvirt/images. It works. It seems something related to selinux. However, my box seems not have selinux installed at all. Anyone knows how to fix this? Thanks, ~Frank >

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[libvirt-users] libvirt external disk-only snapshot will pause the VM?
by Yuanzhen Gu 06 Aug '14

06 Aug '14

Hello folks, If I give command to take external disk-only live snapshot, such as # virsh snapshot-create-as vm1 snapshot_vm1 --disk-only will the guest OS be paused or suspend while the snapshot being taken? Thanks very much! Best, Yuanzhen

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[libvirt-users] error configuring a public bridge --> uvt-kvm: error: libvirt domain 'newtest' has no NIC MACs available.
by Jordi Arjona 06 Aug '14

06 Aug '14

Hi all, First at all, excuse if this is not the right place for sending this email. I'm using ubuntu 14.04 server edition and i'm trying to deploy some virtual machines in a server in such a way that they are visible in the same network that the host machine. The tools I'm using are the uvtool package and libvirt. The error I'm getting is the following: "uvt-kvm: error: libvirt domain 'newtest' has no NIC MACs available." Here I'm providing the quickest way (I think) of reproducing my problem. The steps to follow would be: 1) Creating a bridge. This is my /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback auto em1 iface em1 inet manual auto br0 iface br0 inet static address 9.109.124.62 network 9.109.124.0 netmask 255.255.255.0 broadcast 9.109.124.255 gateway 9.109.124.1 #iface br0 inet dhcp bridge_ports em1 bridge_stp off bridge_fd 0 bridge_maxwait 0 dns-search xx.xx.xx.xx dns-nameservers 192.168.122.1 9.0.146.50 9.0.148.50 2) downloading a trusty tahr cloud image and run it uvt-simplestreams-libvirt sync release=precise arch=amd64 uvt-kvm create test release=trusty 3) duplicate the xml generated when running the machine in order to modify the network interface by the bridge one. In the XML I also remove the uuid and change the VM name. sudo mv /etc/libvirt/qemu/test.xml /etc/libvirt/qemu/test2.xml In test 2 the most relevant change is replacing <interface type='network'> <mac address='52:54:00:86:7a:31'/> <source network='default'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> by <interface type='bridge'> <source bridge='br0'/> <model type='virtio'/> </interface> 4) Once I have my new XML, I define and start the new machine uvt-kvm destroy test virsh undefine test sudo virsh define /etc/libvirt/qemu/test2.xml virsh start newtest (newtest is the name provided in test2.xml) 5) Up to this point everything seems to be fine, but if i run a wait command i get the error uvt-kvm wait newtest --insecure uvt-kvm: error: libvirt domain 'newtest' has no NIC MACs available. I have checked the xml generated when defining newtest and there is a MAC in there, so it is not a problem generating a MAC address. Also the interface br0 is visible for virsh: virsh iface-list Name State MAC Address --------------------------------------------------- br0 active xx:xx:xx:xx:xx:xx lo active 00:00:00:00:00:00 I have been googling for a while and couldn't find anything but this: http://pastebin.com/em0hmy4t That tries something similar and falls in the same error. Any help will be very much appreciated. It is the first time i send anything to one of this mail lists, so, please, if you need me to provide any other info, tell me. Thanks! Jordi

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[libvirt-users] How to import libvirt library in Java
by Restituto Marcus Arevalo 05 Aug '14

05 Aug '14

Hi, I am trying to get the CPU/Memory usage of the VMs in KVM using Java. But before I get to start coding, I have no idea where to get the libvirt library and how to import it in Java. Does anyone know where I can get it and how I'll be able to use its library? Thanks regards, Marco

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