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[libvirt-users] LXC: unable to configure networking for LXC
by Avi Weit 11 Mar '10

11 Mar '10

Hello, I would like to set up sshd under an LXC application container and to be able to connect into it from the host. I was able to achieve that with LXC tools CLI after setting up a bridge via brctl and creating a proper lxc.conf file for lxc-execute to use. However, I am unable to do so via libvirt. I am using libvirt version 0.7.1 installed on fedora 12. I first verified that the default network is up [root@enc12 avi]# virsh net-list --all Name State Autostart ----------------------------------------- default active yes and that the bridge exists [root@enc12 avi]# brctl show bridge name bridge id STP enabled interfaces virbr0 8000.000000000000 yes I then went over the explanations under http://www.libvirt.org/formatdomain.html#elementsNICS and http://wiki.libvirt.org/page/Networking and made sure net.ipv4.ip_forward = 1 under file /etc/sysctl.conf on the host after that, I created a container with the following xml specification: <domain type='lxc'> <name>ssh9</name> <memory>500000</memory> <os> <type>exe</type> <init>/usr/sbin/sshd</init> </os> <vcpu>1</vcpu> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/libexec/libvirt_lxc</emulator> <interface type='network'> <source network='default'/> </interface> <console type='pty' /> </devices> </domain> Below is the command that verifies LXC is running followed by dumpxml: [root@enc12 avi]# virsh -c lxc:/// list --all Id Name State ---------------------------------- 1551 ssh9 running <domain type='lxc' id='1551'> <name>ssh9</name> <uuid>ead3dc4f-9b3f-eec0-e83a-1d87e0ffb1eb</uuid> <memory>500000</memory> <currentMemory>500000</currentMemory> <vcpu>1</vcpu> <os> <type arch='i686'>exe</type> <init>/usr/sbin/sshd</init> </os> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/libexec/libvirt_lxc</emulator> <interface type='network'> <mac address='52:54:00:e8:e3:dd'/> <source network='default'/> <target dev='veth0'/> </interface> <console type='pty' tty='/dev/pts/1'> <source path='/dev/pts/1'/> <target port='0'/> </console> </devices> </domain> However, I can not see the IP address of the container so was not able to connect it. I can also see that the routing table configured on the host - routes any address destined to network 192.168.122 - into the bridge and I understood that the container should have constructed with one of the IPs in the range of 192.168.122.2 to 192.168.122.254 (as defined in dhcp tag under default network) but it did not happen. Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 9.148.28.32 * 255.255.255.240 U 1 0 0 eth0 192.168.122.0 * 255.255.255.0 U 0 0 0 virbr0 default 9.148.28.33 0.0.0.0 UG 0 0 0 eth0 I wonder what am I missing here. Thanks, - Avi

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[libvirt-users] info about "migration check"
by Paolo Smiraglia 11 Mar '10

11 Mar '10

Hi guys! I'm Paolo, and I'm working on my graduation thesis. One of my thesis' subject is to define a migration check which will be used to perform "secure migration" using IMA measurement. Someone can suggest me a documentation (code examples, technical paper, etc) about migration cheks? Now I'm analyzing libvirt source code to uderstand migration-cheks mechanism, but the analysis has a ways to go...... Thanks!

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[libvirt-users] No qemu-dm process for running domain
by Zhang Qian 09 Mar '10

09 Mar '10

Hi, My C application is using libvirt to operate domains, but I found when I started a domain with my application, there was no qemu-dm for this running VM, and I can not access this domain with the graphic console provided by virt-manager. But if I started the same domain with virsh which linked with the libvirt shipped in OS, everything was OK, there will be a qemu-dm process for the running domain, and the graphic console provided by virt-manager worked well. The libvirt used by my application is libvirt-0.6.4, I just downloaded libvirt-0.6.4.tar.gz from http://libvirt.org/sources/old/libvirt-0.6.4.tar.gz, and I built it by running "./configure --prefix=/usr && make". Here are the details of my machine: # cat /etc/redhat-release Scientific Linux SL release 5.4 (Boron) # uname -an Linux ib06b07 2.6.18-164.11.1.el5xen #1 SMP Wed Jan 20 08:53:10 EST 2010 i686 i686 i386 GNU/Linux Was there anything wrong when I built libvirt-0.6.4? Should I enable some compilation options for launching qemu-dm process for running domains? Any suggestions will be really appreciated, thanks in advance! Regards, Qian

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[libvirt-users] ESX access using libvirt
by Jonathan Kelley 05 Mar '10

05 Mar '10

Hello, I am trying to access an ESXi host using libvirt but it seems that it requires netcat to be running on the ESX server. My ESX 4 does not have this installed and I am wondering if this is required or is there some other way to get this working? Thanks, Jon

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[libvirt-users] Libvirt Auth
by Marco Mornati 04 Mar '10

04 Mar '10

Hello guys, I've created a plugin for Hudson (CI) to manage virtmachines using libvirt java (start vm for a build and stop just after). I've just a problem in authentication, in fact I cannot send uname and password using code, libvirt ask me for the credentials on CLI. someone could explain me How I can use authentican or where I can find an usage guide or example? Thanks a lot Bye Marco

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[libvirt-users] Libvirt and openvz?
by Thomas Graves 03 Mar '10

03 Mar '10

I just recently started using openvz and I'm trying to use libvirt/virsh with it. I followed the directions on page: http://libvirt.org/drvopenvz.html But I get an error trying to run define with the example config file: virsh define virt.conf error: Failed to define domain from virt.conf error: unknown OS type exe I'm using libvirt 0.7.2. Does anyone have more example configuration files or other setup instructions? Does Libvirt allow you to specify other resource limits and controls that openvz has - like vzctl set --devnodes device:rw or vzctl set kmemsize? Thanks, Tom

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[libvirt-users] location of network xml files
by carlos campderrós 01 Mar '10

01 Mar '10

Hello, On Ubuntu 9.04 (libvirt 0.6.1-0ubuntu5.1) I have 2 different network files: root@sauron:~# ls -l `locate default.xml` lrwxrwxrwx 1 root root 14 2010-02-13 12:34 /etc/libvirt/qemu/networks/autostart/default.xml -> ../default.xml -rw-r--r-- 1 root root 373 2010-03-01 00:02 /etc/libvirt/qemu/networks/default.xml -rw------- 1 root root 319 2010-03-01 00:04 /var/lib/libvirt/network/default.xml Modifications I do on the /etc file are ignored (I'd like to modify the dhcp range and set fixed ips to VM mac addresses). I don't understand why this file is there, as it seems ignored by everything, and why the autostart symlink points to it instead of the /var/lib/libvirt one. Is it reasonable to symlink (or hardlink if possible) one file to the other? Or to remove the /etc file and point the autostart to the /var file? Also, does the autostart do something? because it's pointing to the ignored file. thanks, carlos. -- Si no puedes deslumbrar con tu sabiduría, desconcierta con tus gilipolleces

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[libvirt-users] Migration error
by zorgman 26 Feb '10

26 Feb '10

Hi, I'm trying to migrate a VM from one libvirt 0.7.6-1 (qemu-kvm 0.11.1+dfsg-1) to another libvirt 0.7.6-2 (qemu-kvm 0.11.1+dfsg-1) connected with SSH , i have followed pre requite (same shared, same path, same network conf ...) . But when i migrate , i have following error : operation failed: /migration to 'tcp:x.x.x.x:49157' failed: migration failed DETAIL : Unable to migrate guest: Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/migrate.py", line 457, in _async_migrate vm.migrate(dstconn, migrate_uri, rate, live, secure) File "/usr/share/virt-manager/virtManager/domain.py", line 1272, in migrate self._backend.migrate(destconn.vmm, flags, newname, interface, rate) File "/usr/lib/python2.5/site-packages/libvirt.py", line 429, in migrate if ret is None:raise libvirtError('virDomainMigrate() failed', dom=self) libvirtError: operation failed: migration to 'tcp:portable.artis.int:49157' failed: migration failed /on the destination libvirt i can see in syslog : /Feb 26 11:16:25 portable libvirtd: 11:16:25.281: error : qemudDomainGetInfo:3744 : Domain not found: no domain with matching uuid '71c22b3b-4c93-80bd-8387-2b502887c2aa' Feb 26 11:16:25 portable libvirtd: 11:16:25.283: error : qemudDomainGetInfo:3744 : Domain not found: no domain with matching uuid '71c22b3b-4c93-80bd-8387-2b502887c2aa' Feb 26 11:16:25 portable kernel: [ 3022.213730] virbr0: port 1(vnet0) entering disabled state Feb 26 11:16:25 portable kernel: [ 3022.228917] device vnet0 left promiscuous mode Feb 26 11:16:25 portable kernel: [ 3022.228925] virbr0: port 1(vnet0) entering disabled state Feb 26 11:16:25 portable NetworkManager: SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/vnet0, iface: vnet0) Feb 26 11:17:01 portable /USR/SBIN/CRON[2606]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Feb 26 11:24:47 portable NetworkManager: <WARN> nm_signal_handler(): Caught signal 15, shutting down normally. Feb 26 11:24:47 portable NetworkManager: <info> (wlan0): taking down device. Feb 26 11:24:47 portable NetworkManager: <info> exiting (success) /in the destination libvirt vm log i can see the cmd running by migration: /LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin HOME=/ QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc-0.11 -enable-kvm -m 256 -smp 1 -name testmigration -uuid 71c22b3b-4c93-80bd-8387-2b502887c2aa -monitor unix:/var/lib/libvirt/qemu/testmigration.monitor,server,nowait -boot c -drive file=/mnt/testmigration.img,if=virtio,boot=on,format=qcow2 -drive if=ide,media=cdrom,bus=1,unit=0,format=raw -net nic,macaddr=52:54:00:7a:a4:98,vlan=0,model=virtio,name=net0 -net tap,fd=50,vlan=0,name=hostnet0 -serial pty -parallel none -usb -vnc 127.0.0.1:0 -k fr -vga cirrus -incoming tcp:0.0.0.0:49156 -balloon virtio/ I'm using Debian. The problem occure online as offline mod.

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[libvirt-users] How to find IP address that is in use?
by Neil Aggarwal 25 Feb '10

25 Feb '10

Hello: When I try to start a VPS, it tells me the IP address is already in use by another system. How do I find out what guest is using an IP address? Is there a virsh command to list the IP addresses that are in use? Thanks, Neil -- Neil Aggarwal, (281)846-8957 FREE trial: cPanel VPS with unmetered bandwidth http://UnmeteredVPS.net/cpanel

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[libvirt-users] /dev/pts linking option?
by Jon Masters 24 Feb '10

24 Feb '10

Folks, Does anyone know whether libvirt provides a means for me to guarantee a persistent link for my guest's virtual serial console? I need to have a consistent mapping (for example, a symlink that always points to the correct /dev/pts entry) so I can automate kgdb hookup on boot. Jon.

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