September 2014 - Users - libvirt List Archives

[libvirt-users] Does virsh actually work?
by Gary Hook 03 Sep '14

03 Sep '14

I have been beating my head against a wall attempting to get virsh to migrate a simple VM from one host to another. I have two systems running Ubuntu 14.04 with libvirt 1.2.2. Yes, they are bridged. Non-shared storage. Modest guest VM that only requires 100G of disk space; there is far more available. In trying to accomplish even the simplest migration (per every page I can find from both the Fedore Project and Red Hat) I consistently get the following results: root@huey:/tmp# virsh list --all Id Name State ---------------------------------------------------- 9 e7f75b9b-9ed4-4f7e-aa86-e481ab911d6f running - 81c50b5a-24ef-47d5-88ae-16ee7f4f9537 shut off - acd06610-c919-450b-97c8-8e49b9a0d45c shut off root@huey:/tmp# virsh migrate --live --p2p e7f75b9b-9ed4-4f7e-aa86-e481ab911d6f qemu+ssh://10.10.11.204/system error: Failed to open file '/mnt/store01/virt/e7f75b9b-9ed4-4f7e-aa86-e481ab911d6f.qcow2': No such file or directory root@huey:/tmp# ls -al /mnt/store01/virt total 9140768 drwxr-xr-x 2 libvirt-qemu kvm 4096 Sep 3 10:17 . drwxr-xr-x 13 root root 4096 Aug 28 10:39 .. -rw-r--r-- 1 libvirt-qemu kvm 3271688192 Aug 29 14:39 81c50b5a-24ef-47d5-88ae-16ee7f4f9537.qcow2 -rw-r--r-- 1 libvirt-qemu kvm 2523136000 Aug 29 14:47 acd06610-c919-450b-97c8-8e49b9a0d45c.qcow2 -rw-r--r-- 1 libvirt-qemu kvm 3565486080 Sep 3 13:52 e7f75b9b-9ed4-4f7e-aa86-e481ab911d6f.qcow2 root@dewey:~ >ls -al /mnt/store01/virt total 8 drwxrwxrwx 2 libvirt-qemu kvm 4096 Sep 3 12:30 . drwxr-xr-x 13 root root 4096 Aug 29 16:36 .. root@dewey:~ > (huey is 10.10.11.203, dewey is 10.10.11.204; DNS works, but I thought to eliminate that as a source of this problem.) As can be seen, the .qcow2 files exists on the source system, and does not exist on the target system. The directory shown is where images are to be stored. There is no problem starting and stopping VMs on the systems. It is not at all clear where the failure is occurring; there is no documentation that discusses this failure, of course. I believe that I am invoking a basic migration per every page I can find in a web search. Please correct any errors. I am working as root on both systems, and use ssh to get from one system to another, no passwords, no authentication required. All works well. Any observations, or suggestions as to what configuration parameters I should check, would be greatly appreciated. Thank you. Gary

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[libvirt-users] How to have a directory and its subdirectories as a storage pool
by Marc Haber 03 Sep '14

03 Sep '14

Hi, I would like to use btrfs subvolumes as storage place for VM images to use snapshots. Unfortunately, this does not seem to work in virt-manager at least since the "filesystem directory" storage pool type does not allow me to descend into subdirectories. Is there a trick to do this? Can I do it with virsh, or in the XML? Greetings Marc -- ----------------------------------------------------------------------------- Marc Haber | "I don't trust Computers. They | Mailadresse im Header Leimen, Germany | lose things." Winona Ryder | Fon: *49 6224 1600402 Nordisch by Nature | How to make an American Quilt | Fax: *49 6224 1600420

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[libvirt-users] Network reconfiguration glitch after migration
by Joaquim Barrera 03 Sep '14

03 Sep '14

Hello everyone, I have the following scenario: * 2 host machines (H1 and H2) running VMs. I execute migrations (QEMU) from one host to the other, and so on. The migrations are done in a dedicated LAN (eth1 in both hosts) while regular department LAN runs on eth0 * 1 computer (my desktop computer) also connected to this common LAN on eth0. The VMs have a Python script sending UDP packets to my desktop computer (which has the server part of the Python script), every 250 ms, to be able to mesure downtime and other stuff. Once I run a live migration from H1 to H2, I would expect the downtime to be in the order of ms, or maybe a few seconds, but it takes something like 10 to 20 seconds on average for the packets to resume arriving at my computer. One could think about the network reconfiguration delay, or other reasons, but here comes the tricky part: If I have a ping running on the destination host to the internal IP that the VM is supposed to have once the migration is done, the UDP packets resume just a few ms after the migration os done. Is like: if the VM only has outgoing connections, it takes a lot of time to resume its operation, but if it has some incoming connection, the network resumes very quick. I know it may sound wierd, but maybe there is a clear reason for this issue. Any ideas? Thank you!

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[libvirt-users] libvirt ignores ip setting when creating a xen domU?
by Kim Larry 02 Sep '14

02 Sep '14

Hi, I'm currently writing a script to avoid ip conflict but I couldn't get ip address from xenstore when I create a guest using libvirt with libxl connector. With 'xl create' command, it works everything fine, but not with libvirt. So I dug into the source code, I couldn't find any code for declaring x_nic->ip field in libxlMakeNic(). Or I just created XML file the wrong way? Here is a part of domain XML: <interface type="bridge"> <mac address="00:16:3e:51:6b:19" /> <protocol family="ipv4"> <ip address="10.0.1.119" prefix="24" /> <route gateway="10.0.1.1"/> </protocol> <source bridge="virbr0" /> </interface> Hope someone can help me out. - Larry

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[libvirt-users] How can I get the pid mapping relationship between the container and the native OS
by WANG Cheng D 01 Sep '14

01 Sep '14

Dear all, I want to dynamically change the CPU affinity of multiple processes/threads started in a container. Changing affinity operation is done in native OS. My problem is how to obtain the mapping relationship between the two pids owned by the process/thread. As you know, one pid is given by the container, which is different from the corresponding pid seen by the native OS. Thank you in advance. Cheng

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