- Users - libvirt List Archives

[libvirt-users] LXC + passthrough mount and host filesystem-cache
by James R. Leu 28 Mar '14

28 Mar '14

Hello, I'm using libvirt to build/run LXC instances. My LXC instances use passthrough filesystem mounts. When I try to do large file systems operations (ex tar or rsync) the file systems cache on the host spikes and causes the OOM handler to run and kills processes in the LXC. Has anyone else seen this? Is there a way around this? At this point I'm resorting to running a cron job that dumps the filesystem cache every 5 minutes. The result is the filesystem cache on the host never grows too large and OOM never runs against LXC processes. The obvious down fall is that I'm killing my filesystem performance by duming the cache. I'm currently running libvirt 1.0.0 -- James R. Leu

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[libvirt-users] Facing some error when restarting the libvirtd.
by cool dharma06 28 Mar '14

28 Mar '14

hi, i installed libvirt-1.2.1 from the source with xen-4.3.1 and i am facing the following error when restarting the libvirt. Installation steps: ./autogen.sh --system --with-xen=yes --with-libxl=yes make make install and in the libvirtd.conf i enabled the following things auth_unix_ro auth_unix_rw unix_sock_group unix_sock_ro_perms unix_sock_rw_perms unix_sock_dir and libvirt logs when running the following commands i got error message in libvirtd.log tools/libvirtd -f /etc/libvirt/libvirtd.conf -d Error message: 2014-03-28 12:44:59.480+0000: 20024: info : libvirt version: 1.2.2 2014-03-28 12:44:59.480+0000: 20024: error : virIdentityGetSystem:173 : Unable to lookup SELinux process context: Invalid argument 2014-03-28 12:44:59.557+0000: 20024: error : libxlDriverConfigNew:1123 : Unable to configure libxl's memory management parameters 2014-03-28 12:44:59.557+0000: 20024: error : virStateInitialize:749 : Initialization of LIBXL state driver failed: Unable to lookup SELinux process context: Invalid argument 2014-03-28 12:44:59.557+0000: 20024: error : daemonRunStateInit:920 : Driver state initialization failed Any suggestion to solve this one. regards, cooldharma06..:)

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[libvirt-users] TUN/TAP device for lxc guest
by 邓尧 28 Mar '14

28 Mar '14

I want to run a VPN software inside an lxc guest, but the required TUN/TAP device (/dev/net/tun) is missing in the container. Anyone knows how to enable this device ? Here is the definition XML: <domain type="lxc"> <name>centos</name> <memory unit="MiB">1024</memory> <os> <type>exe</type> <init>/sbin/init</init> </os> <devices> <console type="pty"/> <filesystem type="mount"> <source dir="/virsh/centos"/> <target dir="/"/> </filesystem> <interface type="bridge"> <source bridge="br0"/> <model type="virtio"/> </interface> </devices> </domain> Thanks Yao

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[libvirt-users] Libvirt libssh2 authentication
by David Dias 27 Mar '14

27 Mar '14

Hi, I am working on a java application using libvirt java API (version 0.4.7) and i would like to authenticate through ssh within my application (no need for the user to type his password). How can i submit SSH authentication credentials to libvirt? I am trying to get it working using libssh2 callback, but i get the error: "SSH transport error: no suitable method to retrieve authentication credentials" before anything happens. I have the same error running "virsh -c qemu+libssh2://username@host/system list" command. What is the right way to get the ssh connection working from the java code? regards, David

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[libvirt-users] Attach / detach problem for passthrough/SR-IOV in libvirt
by Mohsen Ghaemi 27 Mar '14

27 Mar '14

Hi all I just encountered a problem in libvirt while was trying to attach and detach a sr-iov vf to my VM The version of my libvirt is 1.1.1-0ubuntu8.5 I tried to attach the device using following xml <interface type='hostdev' managed='yes'> <mac address='5c:01:fd:12:34:58'/> <source> <address type='pci' domain='0x0000' bus='0x04' slot='0x01' function='0x1'/> </source> </interface> When i attached device it worked properly and i managed to ping another host. virsh # attach-device t5 1.xml Device attached successfully But when i detached it still i had network traffic in my VM but libvirt (virsh) said that virsh # detach-device t5 1.xml Device detached successfully The next time i tried to attach it libvirt said that virsh # attach-device t5 1.xml error: Failed to attach device from 1.xml error: Requested operation is not valid: PCI device 0000:04:01.1 is in use by domain t5 I tried it with different VMs and different guest OSs that the same happend. The same action was done with another host running libvirt version Installed: 1.0.2-0ubuntu11.13.04.5~cloud1 Candidate: 1.0.2-0ubuntu11.13.04.5~cloud1 and it worked pretty OK. No problem. Do you have any idea what is wrong? More information: Kernel : 3.8.0-37-generic /etc/libvirt/qemu.conf : security_driver = "none” root@compute01:~# ethtool -i eth5 driver: bnx2x version: 1.78.58 firmware-version: bc 7.4.22 phy 1.34 bus-info: 0000:04:00.1 supports-statistics: yes supports-test: yes supports-eeprom-access: yes supports-register-dump: yes

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[libvirt-users] libvirt-users@redhat.com
by Mohsen Ghaemi 27 Mar '14

27 Mar '14

Hi all I just encountered a problem in libvirt while was trying to attach and detach a sr-iov vf to my VM The version of my libvirt is 1.1.1-0ubuntu8.5 I tried to attach the device using following xml <interface type='hostdev' managed='yes'> <mac address='5c:01:fd:12:34:58'/> <source> <address type='pci' domain='0x0000' bus='0x04' slot='0x01' function='0x1'/> </source> </interface> When i attached device it worked properly and i managed to ping another host. virsh # attach-device t5 1.xml Device attached successfully But when i detached it still i had network traffic in my VM but libvirt (virsh) said that virsh # detach-device t5 1.xml Device detached successfully The next time i tried to attach it libvirt said that virsh # attach-device t5 1.xml error: Failed to attach device from 1.xml error: Requested operation is not valid: PCI device 0000:04:01.1 is in use by domain t5 I tried it with different VMs and different guest OSs that the same happend. The same action was done with another host running libvirt version Installed: 1.0.2-0ubuntu11.13.04.5~cloud1 Candidate: 1.0.2-0ubuntu11.13.04.5~cloud1 and it worked pretty OK. No problem. Do you have any idea what is wrong? More information: Kernel : 3.8.0-37-generic /etc/libvirt/qemu.conf : security_driver = "none” root@compute01:~# ethtool -i eth5 driver: bnx2x version: 1.78.58 firmware-version: bc 7.4.22 phy 1.34 bus-info: 0000:04:00.1 supports-statistics: yes supports-test: yes supports-eeprom-access: yes supports-register-dump: yes

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[libvirt-users] Sending command to virtual machine
by lukass.vacek＠seznam.cz 26 Mar '14

26 Mar '14

Hello, I would like to know if there is a way how to execute a command inside of running virDomainPtr. For example call exec command but not on my computer, but on running virtual machine. If there is a way, what needs to be done for it? Thanks for answer!

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[libvirt-users] Recreating nwfilter rules without a restart
by Brian Rak 26 Mar '14

26 Mar '14

Let's say I have some iptables rules defined to restrict guest traffic. If I restart the hosts firewall 'service iptables restart', all the guest-specific rules get blown away. Is there a way to reapply all the guest firewall rules, without restarting each individual guest? It looks like if I edit a nwfilter with `virsh nwfilter-edit` it goes and reapplies the rules to all the guests, so this functionality seems to be present already.

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[libvirt-users] who Maintain netfilter, i want to submit a patch
by bigclouds 26 Mar '14

26 Mar '14

hi,all i have a patch for netfilter, i want to talk with you, how to submit ? thanks

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[libvirt-users] Starting processes inside VMs using Libvirt?
by Taimur Al Said 25 Mar '14

25 Mar '14

Hi there, I am a beginner with Libvirt. I was practicing using Python bindings with libvirt to do some basic stuff like starting a VM, rebooting a VM, displaying the number of domain,etc. I was wondering since the hypervisor has control over the VMs, it is possible to use Libvirt to inject code into the VM? Is it possible to start processes inside a particular VM using the Libvirt API. If not, what would you recommend instead? Thanks in advance Regards, T.alsaid

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