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[libvirt-users] How to open virtual machine console using python libvirt.
by deepak＠fluentsoft.com 26 May '14

26 May '14

Hi, How to open virtual machine console using python libvirt. I tried openConsole function,it returning integer 0 and not opening any console. code ==== import libvirt conn = libvirt.open('qemu+ssh://root@192.168.1.6/system') vm=conn.lookupByName("vm1-1") stream=onn.newStream(libvirt.VIR_STREAM_NONBLOCK) vm.openConsole(None,stream, 0) Regards, Deepak S ------------------------- Message sent via Atmail Open - http://atmail.org/

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[libvirt-users] [netcf] Why netcf can not rename a existing physical interface dynamically by itself?
by Jianwei Hu 26 May '14

26 May '14

Hi All, I have a usage question about netcf. Why netcf can not rename a existing physical interface dynamically by itself? If you have any other method, please share to me, or can we add support for it in netcf? You can see the following steps for details. Version: netcf-0.2.4-1.el6.x86_64 kernel-2.6.32-431.el6.x86_64 1. Select a existing NIC from host, for example eth1. [root@rhel6 ~]# ncftool list --all eth0 eth1 lo [root@rhel6 ~]# ncftool dumpxml eth1 <?xml version="1.0"?> <interface type="ethernet" name="eth1"> <start mode="none"/> <mac address="00:1B:21:27:4E:CE"/> <protocol family="ipv4"> <dhcp/> </protocol> </interface> [root@rhel6 ~]# ifconfig eth1 eth1 Link encap:Ethernet HWaddr 00:1B:21:27:4E:CE BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) [root@rhel6 ~]# ncftool ifup eth1 Interface eth1 successfully brought up 2. Undefine eth1 from host [root@rhel6 ~]# ncftool ifdown eth1 Interface eth1 successfully brought down [root@rhel6 ~]# ncftool undefine eth1 eth1 undefined [root@rhel6 ~]# ncftool list --all eth0 lo 3. Prepare another xml with same MAC and a new name "jiahu" [root@rhel6 ~]# cat jiahu.xml <interface type="ethernet" name="jiahu"> <start mode="none"/> <mac address="00:1B:21:27:4E:CE"/> <protocol family="ipv4"> <dhcp/> </protocol> </interface> 4. Define the "jiahu", and start it. [root@rhel6 ~]# ncftool define jiahu.xml Defined interface jiahu [root@rhel6 ~]# ncftool dumpxml jiahu <?xml version="1.0"?> <interface type="ethernet" name="jiahu"> <start mode="none"/> <mac address="00:1B:21:27:4E:CE"/> <protocol family="ipv4"> <dhcp/> </protocol> </interface> [root@rhel6 ~]# ifconfig jiahu jiahu: error fetching interface information: Device not found [root@rhel6 ~]# cat /etc/sysconfig/network-scripts/ifcfg-jiahu DEVICE=jiahu HWADDR=00:1B:21:27:4E:CE ONBOOT=no BOOTPROTO=dhcp [root@rhel6 ~]# ncftool ifup jiahu Interface jiahu bring-up failed! error: failed to execute external program error: Running 'ifup jiahu' failed with exit code 1: Device jiahu does not seem to be present, delaying initialization. [root@rhel6 ~]# ll /sys/class/net/ total 0 lrwxrwxrwx. 1 root root 0 May 23 11:32 eth0 -> ../../devices/pci0000:00/0000:00:19.0/net/eth0 lrwxrwxrwx. 1 root root 0 May 23 11:35 eth1 -> ../../devices/pci0000:00/0000:00:1e.0/0000:02:00.0/net/eth1 lrwxrwxrwx. 1 root root 0 May 23 11:32 lo -> ../../devices/virtual/net/lo lrwxrwxrwx. 1 root root 0 May 23 11:32 virbr0 -> ../../devices/virtual/net/virbr0 lrwxrwxrwx. 1 root root 0 May 23 11:32 virbr0-nic -> ../../devices/virtual/net/virbr0-nic 5. Reboot the host OS, the jiahu interface appeared. [root@rhel6 ~]# ifconfig jiahu jiahu Link encap:Ethernet HWaddr 00:1B:21:27:4E:CE BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) BR, Jianwei

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[libvirt-users] How i can calculate cpu utilization percentage for domain running under a host using libvirt API.
by deepak＠fluentsoft.com 23 May '14

23 May '14

Hi, How i can calculate cpu utilization percentage for domain running under a host using libvirt API. Which function can i use for calulating cpu percentage? Thanks and Regards, Deepak S ------------------------- Message sent via Atmail Open - http://atmail.org/

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[libvirt-users] - defining routing between guests
by Jacek Pielaszkiewicz 23 May '14

23 May '14

Hi, On my host I have few lxc containers. Containers are split between let say three virtual networks. My goal is to define custom routing between networks. I can do that using for example iptables. Is it possible to do that only in libvirt (in network/domains/network filters configuration only)? I did some attempts with network filters, but it doesn't work. I have managed to limit only inbound/outbound traffic. I have found some examples that use libvirt hooks, but I would like to avoid that. I will be grateful for help and some examples. Best Regards Jacek Pielaszkiewicz Samsung R&D Institute Poland Samsung Electronics Email: j.pielaszkie(a)samsung.com

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[libvirt-users] problem with bond/team network interfaces
by Nerijus Baliunas 23 May '14

23 May '14

Hello, I have VM attached to bridge br0. VM can see the network (ping works) when the bridge has ethernet interfaces. But when I create bond or team device and attach it to a bridge instead of eth interface, VM does not ping anymore. Any ideas why? Thanks, Nerijus

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[libvirt-users] How i can calculate cpu utilization percentage for host using python libvirt API.
by deepak＠fluentsoft.com 23 May '14

23 May '14

Hi, How i can calculate cpu utilization percentage for host using python libvirt API. Which function can i use for calulating cpu percentage of host and Virtual Machines? 1)Host cpu utilization ==================== I tried getCPUStats() function,it gives the following output.Is there any way to calculate cpu percentage from the following output? Is there any other function availabe for calculating cpu utilization percentage? output:{'kernel': 34870000000L, 'idle': 3522190000000L, 'user': 209930000000L, 'iowait': 132240000000L} import libvirt conn=libvirt.open('qemu+ssh://root@192.168.1.4/system') conn.getCPUStats(-1,0) Thanks and Regards, Deepak S ------------------------- Message sent via Atmail Open - http://atmail.org/

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[libvirt-users] sluggish behavior
by Ainsworth, Thomas 20 May '14

20 May '14

Greetings, This is my first stab at this mailing list. Forgive me if I am over/under verbose. We have been running KVM for a while now and love it. Recently I have noticed a weird anomaly that is getting on my nerves. When I clone (GUI or virt-clone from CLI) both* virt-manager* and *virsh* enquiries get extremely sluggish. Using top I cannot see any resource issues. No I/O wait, the load average show noting outside of the normal, nothing taking CPU or Memory. I have notice that in a couple of the instances the libvirtd daemon was stopped. We have more than twenty (20 +) VM's running - they all seem fine. The metal server is a beast of an 820 with 192GB of RAM and 64 CPU's. The load average rarely creeps above 2 or 3. Do not think it is a resource issue. I can write a test file to the filesystem/volume where the images live at over 350MB/s. The sluggishness disappears after a reboot. If I clone a VM ... back again ... Any ideas? Thanks in advance, Tom Ainsworth RHCSA

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[libvirt-users] [LXC] feature request - hostdev target
by Piotr Bartosiewicz 20 May '14

20 May '14

Hi, I am trying to mount /dev/tty5 from host as /dev/tty1 inside LXC container, but libvirt currently supports only 1-to-1 mapping: <hostdev mode='capabilities' type='misc'> <source> <char>/dev/tty5</char> </source> </hostdev> What do you thing about extending this by adding target parameter? It is easy to archive manually using mknod (mknod /dev/tty1 c 4 5), but still I think it would be nice to add this feature to the libvirt. Regards, Piotrek -- Piotr Bartosiewicz Samsung R&D Institute Poland Samsung Electronics

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[libvirt-users] Need help with [virt net-create]
by Srinivas_G_Gowda＠dell.com 20 May '14

20 May '14

Is it possible to configure 2 virtual nics in the same ip range ? Here is what I am trying. **** This works **************** cat nw1.xml <network> <name>nw1</name> <domain name='nw1' /> <forward mode='nat' dev='eth2'/> <ip address='192.168.101.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.101.128' end='192.168.101.254'/> </dhcp> </ip> </network> [root@localhost nw]# virsh net-create nw1.xml Network nw1 created from nw1.xml [root@localhost nw]# virsh net-list --all Name State Autostart Persistent ---------------------------------------------------------- nw1 active no no default active yes yes ****** FAILS when given the same ip address range of an existing virtual interface ******* [root@localhost nw]# cat nw2.xml <network> <name>nw2</name> <domain name='nw2' /> <forward mode='nat' dev='eth2'/> <ip address='192.168.101.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.101.128' end='192.168.101.254'/> </dhcp> </ip> </network> [root@localhost nw]# virsh net-create nw2.xml error: Failed to create network from nw2.xml error: internal error: Network is already in use by interface virbr1 ****** PASS - on giving diff ip range ******* [root@localhost nw]# cat nw3.xml <network> <name>nw3</name> <domain name='nw3' /> <forward mode='nat' dev='eth2'/> <ip address='192.168.102.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.102.128' end='192.168.102.254'/> </dhcp> </ip> </network> [root@localhost nw]# virsh net-create nw3.xml Network nw3 created from nw3.xml [root@localhost nw]# virsh net-list --all Name State Autostart Persistent ---------------------------------------------------------- nw1 active no no nw3 active no no default active yes yes Any suggestions on what could be wrong here ? Thanks, G

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[libvirt-users] Cloning of Running Domain
by Thomas 19 May '14

19 May '14

Hello, I have a running transient domain with a storage volume that utilizes a backing file (both QCOW2 format). I'd like to capture the disk and memory state of the domain preferably to external file(s) (which I understand is an 'external checkpoint'), so that other independent domains can be instantiated and effectively "resumed" from this point-in-time profile. My network configuration is such that domains are network-isolated at L2, so resolving MAC/IP address and similar conflicts within the guest are not of concern. Is it possible to accomplish this? I've looked at both the snapshot/checkpoint and migration APIs and it appears as though the pieces are there, but am having difficulty defining the proper workflow. For instance, an external online checkpoint can be created using virDomainSnapshotCreateXML, but is it possible to disassociate the snapshot from the source domain (effectively returning it to its pre-snapshot state) and at a later time instantiate new domains using the the disk/memory data from the snapshot files? Any recommendations, insight, or guidance is appreciated. Thanks, -Thomas

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