- Users - libvirt List Archives

[libvirt-users] C code to generate domain XML
by Parvathi 19 Mar '15

19 Mar '15

Hi, Are there any C code (in libvirt) to generate domain XML like the one we supply to virsh? Thanks!

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[libvirt-users] Development of application on using the libvirt API(s)
by Parvathi 19 Mar '15

19 Mar '15

Hi, I am developing an application that would essentially control/run VMs on a X86_64 host machine. The existing OS is 32 bit based so the application needs to be 32bit too. KVM/QEMU are 64 bit so that guests could be either be 32 or 64 bit. Does using libvirt as 32bit library on a 64bit host (capable of hosting 32 and 64 bit guests) pose any problems? Will it even work? Thanks, Parvathi

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[libvirt-users] Regarding save and restore in libvirt 1.2.2
by cool dharma06 19 Mar '15

19 Mar '15

hi all, i am exploring openstack. By the openstack i experimented the resizing instance its working fine. But from virsh i tried save and redstore VM its not working properly. i put GDB on libvirtd process also its not showing anything. its running perfectly. while virsh save vm id filename -> saving the VM and get into shutdown state. then i tried to restore by virsh restore filename --running -> its showing as running then its getting destroyed automatically. I cant able find the issue. I grepped the logs also its not showing anything related to errors. 2. By virsh save-image-edit filename i tried to edit the vCPUs number but i am not able to edit and save the file. Its showing the following error -> "error: unsupported configuration: Target domain vCPU count 2 does not match source 1" Give some suggestions to resolve the issue. Thanks & regrads, cooldharma06 .. :)

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[libvirt-users] pty pairing host - guest
by Neel Basu 19 Mar '15

19 Mar '15

HI!, I am using virt-manager GUI. There I can add a `Console Device` through Add Hardware. I can add a virtio pty WITHOUT restarting the VM. also I get a pty allocated to host machine say `/dev/pty/M` My expectation is this `host:/dev/pty/M` is connected with a `guest:/dev/ttyN`. so If I open minicom or screen and write to `host:/dev/pty/M` it will be propagated to 'guest:/dev/ttyN'. Is my expectation correct ? If it is correct how will I know what is the guest tty allocated against this host pty ? This is what I've tried: dumpxml returns <console type='pty' tty='/dev/pts/1'> <source path='/dev/pts/1'/> <target type='serial' port='0'/> <alias name='serial0'/> </console> I expected host:/dev/pts/1 is paired with guest:/dev/ttyS0. so I opened screen/cat/echo on both sides but could not exchange messages ------ Similar to console device I can add a Serial device but that requires a reboot of the guest VM. However I tried that though I prefer to do it without a guest restart. <serial type='pty'> <source path='/dev/pts/1'/> <target port='0'/> <alias name='serial0'/> </serial> here also I expected host:/dev/pts/1 is paired with /dev/ttyS0 but couldn't communicate. My sole requirement is to have a tty pair in host and guest that can be used to communicate with each other. I am using qemu-kvm. Thank You.

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[libvirt-users] how to get disk snapshot size
by Yitao Jiang 16 Mar '15

16 Mar '15

Hi,guys I wanna to get the disk snapshot size, but found nothing libvirt commands related,except qemu-img. I create two disk snapshots, but nothing return its' size [root@cskvm01 qcow2]# qemu-img info /mnt/e6758700-af68-3c06-ade3-53f5f9b93507/e2cf6551-0d2c-4382-a86c-8ba633954ff2 image: /mnt/e6758700-af68-3c06-ade3-53f5f9b93507/e2cf6551-0d2c-4382-a86c-8ba633954ff2 file format: qcow2 virtual size: 5.0G (5368709120 bytes) disk size: 1.0G cluster_size: 65536 Snapshot list: ID TAG VM SIZE DATE VM CLOCK 1 4fc42d73-8257-42bd-8807-81700fd3c689 0 2015-03-15 21:05:55 01:05:53.583 2 2fd6aeab-cb26-446d-b1c6-e8d70d33f651 0 2015-03-15 21:50:35 00:00:00.000 After wrote data to the disk, then create another snapshot [root@cskvm01 qcow2]# qemu-img info /mnt/e6758700-af68-3c06-ade3-53f5f9b93507/e2cf6551-0d2c-4382-a86c-8ba633954ff2 image: /mnt/e6758700-af68-3c06-ade3-53f5f9b93507/e2cf6551-0d2c-4382-a86c-8ba633954ff2 file format: qcow2 virtual size: 5.0G (5368709120 bytes) disk size: 3.9G cluster_size: 65536 Snapshot list: ID TAG VM SIZE DATE VM CLOCK 1 4fc42d73-8257-42bd-8807-81700fd3c689 0 2015-03-15 21:05:55 01:05:53.583 2 2fd6aeab-cb26-446d-b1c6-e8d70d33f651 0 2015-03-15 21:50:35 00:00:00.000 3 63815565-3a06-4366-a1b3-bfeb9c4a07b4 0 2015-03-15 22:22:43 00:00:00.000 VM SIZE column still show 0 Here is my environment qemu-img version 0.12.1, Copyright (c) 2004-2008 Fabrice Bellard libvirtd (libvirt) 0.10.2 CentOS release 6.5 (Final) 2.6.32-431.el6.x86_64 --- Thanks, Yitao(依涛姜) jiangyt.github.io

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[libvirt-users] Processor usage of qemu process.
by Dominique Ramaekers 15 Mar '15

15 Mar '15

I have been using libvirt for a while now with some linux guest installed. And everything has been working great. I've got a nice new (used) HP virtual host with 12 x dual core and 48Gb mem. My Windows servers are getting old, so I found it was time to take the next step and also virtualise my Windows systems. Now I've got two Windows guests on my new host: - A Windows 8.1 which runs a Autodesk Job Processor - A Windows Server 2012 R2 which runs a Pervasive SQL, Autodesk Vault Server (MSSQL, IIS), Autodesk license server,... The first is constanly using 30% host-CPU and the second one is using 50% host-CPU. Both guests are using <5% guest CPU... (Host system load is between 0.1 and 0.3...) Is it normal Windows guests take up 30% to 50% host CPU resources? The Windows 8.1 is actualy a simpel PC with almost no activity... Version: QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.10), Copyright (c) 2003-2008 Fabrice Bellard

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[libvirt-users] How to run qemu with root permission from libvirt.
by Edward Young 15 Mar '15

15 Mar '15

Hi all, My platform is qemu 1.5.1 and libvirt 1.2.0. How to lauch the qemu with root permission, since in the qemu I would like to access the hardware directly. I actually check the runing /usr/bin/kvm process, it indicated that this process is from a root user, but it still failed to act as with root permission. Thanks! Ed

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[libvirt-users] lxc-enter-namespace support in Python API
by Florian Haas 13 Mar '15

13 Mar '15

Hello everyone, referring back to https://www.redhat.com/archives/libvirt-users/2013-August/msg00107.html, in which a user discovered that there is no equivalent to "virsh -c lxc:/// lxc-enter-namespace" in the Python API. Has that ever changed? In that thread Daniel suggested that the user file a bug, but that apparently never happened. Why am I interested in this? Ansible currently supports a somewhat limited libvirt_lxc connection driver which uses lxc-enter-namespace to access LXC containers without SSH (https://github.com/ansible/ansible/blob/devel/lib/ansible/runner/connection…) That connection driver, written in Python like the rest of Ansible, currently has to use jump through subprocess hoops with virsh to enter the namespace, which is slow and doesn't support pipelining. Being able to use the native Python API would help greatly. In addition, if it were to use the Python API instead, the connection plugin could also be extended to use lxc+ssh:// connection types so Ansible users could potentially manage container hosts _and_ all their containers from a single playbook, just so long as they have SSH access to the host. Does anyone know whether that extension of the API is being / has been addressed? Cheers, Florian

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[libvirt-users] lxc-enter-namespace support in Python API
by Florian Haas 13 Mar '15

13 Mar '15

Hello everyone, referring back to https://www.redhat.com/archives/libvirt-users/2013-August/msg00107.html, in which a user discovered that there is no equivalent to "virsh -c lxc:/// lxc-enter-namespace" in the Python API. Has that ever changed? In that thread Daniel suggested that the user file a bug, but that apparently never happened. Why am I interested in this? Ansible currently supports a somewhat limited libvirt_lxc connection driver which uses lxc-enter-namespace to access LXC containers without SSH (https://github.com/ansible/ansible/blob/devel/lib/ansible/runner/connection…) That connection driver, written in Python like the rest of Ansible, currently has to use jump through subprocess hoops with virsh to enter the namespace, which is slow and doesn't support pipelining. Being able to use the native Python API would help greatly. In addition, if it were to use the Python API instead, the connection plugin could also be extended to use lxc+ssh:// connection types so Ansible users could potentially manage container hosts _and_ all their containers from a single playbook, just so long as they have SSH access to the host. Does anyone know whether that extension of the API is being / has been addressed? Cheers, Florian

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[libvirt-users] vm live storage migration failure.
by Edward Young 11 Mar '15

11 Mar '15

Hi all, When I migrate a live vm with two virtual disk images from one node to another. Bothe of the nodes are in the same LAN and there is no shared storage. I run the following command and get the output blew: yyang@node1:~$ sudo virsh migrate --live --persistent --copy-storage-all --unsafe --verbose vm1 qemu+ssh://192.168.1.3/system root(a)192.168.1.3's password: root(a)192.168.1.3's password: root(a)192.168.1.3's password: error: Cannot recv data: Permission denied, please try again. Permission denied, please try again. Permission denied (publickey,password).: Connection reset by peer I'm sure the root passwd I entered is correct. And When I run the following command, it works. I can use qemu+ssh to connect to a remote libvirtd daemon. yyang@node2:~$ sudo virsh Welcome to virsh, the virtualization interactive terminal. Type: 'help' for help with commands 'quit' to quit virsh # connect qemu+ssh://192.168.1.2/system root(a)192.168.1.2's password: virsh # list Id Name State ---------------------------------------------------- 6 vm1 running 7 vm2 running virsh # Any suggestions about this issue? Thanks a lot! Ed

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