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[libvirt-users] libvirt network without dns ?
by Scott Moser 20 Sep '12

20 Sep '12

Hey, I've opened a bug against ubuntu at [1]. I realize this is probably not a high priority, but I was just curious if it is possible to have libvirt configure a network and *not* run a DNS server on it (dnsmasq). Perhaps I could convince libvirt to run dnsmasq with '--port 0'? For my explicit use case i was hoping/expecting to run my own dns and dhcp servers, possibly a specific server bound only to that interface (as dnsmasq does). I just wanted libvirt to create the bridge and setup NAT (and automatically bring the network and any configured guests on it up on boot). Heres what I did. $ BRIDGE="mybr0"; IP="192.168.123.1"; $ cat > $BRIDGE.xml <<EOF <network> <name>$BRIDGE</name> <forward mode='nat'/> <bridge name='$BRIDGE' stp='off' delay='0' /> <ip address='$IP' netmask='255.255.255.0'> </ip> </network> EOF $ sudo virsh -c qemu:///system net-define $BRIDGE.xml $ sudo virsh -c qemu:///system net-start $BRIDGE ## See, after 'start' dnsmasq is running and usable on that interface. $ ps axw | grep dnsm | grep $BRIDGE.pid 9888 ? S 0:00 /usr/sbin/dnsmasq -u libvirt-dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/mybr0.pid --conf-file= --except-interface lo --listen-address 192.168.123.1 $ dig +short @$IP www.ubuntu.com 91.189.90.41 -- [1] https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1053408

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[libvirt-users] libvirt and lxc and puppet
by erkan yanar 20 Sep '12

20 Sep '12

Hoi, Im running some hosts with a lot of lxc-containers (lxc-execute). Now Im going to have a look into libvirt. So I wonder: Are there some docs about what lxc@libvirt is supporting? Imho you have a subset of the lxc-capabilities with libvirt. Anyone doing by any chance the same and using puppet to deploy (application)containers? So I could get a recommendation which module to use, instead of writing ma own. Regards Erkan -- über den grenzen muß die freiheit wohl wolkenlos sein

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[libvirt-users] libvirt 0.10 and cephx
by Andrey Korolyov 19 Sep '12

19 Sep '12

Hello, Current version adding 'auth_supported=none' at the end of disk path and failing to do an authentication with specified cephx key: <source protocol='rbd' name='rbd/vmxxxxxxxxx:id=qemukvm:key=[cut]==:auth_supported=cephx'> <host name='10.0.0.13' port='6789'/> <host name='10.0.0.10' port='6789'/> <host name='10.0.0.17' port='6789'/> </source> results to: 0.10.1 -drive file=rbd:rbd/vmxxxxxxxxx-YSG:id=qemukvm:key=[cut]:auth_supported=cephx:auth_supported=none:mon_host=10.0.0.13\:6789\;10.0.0.10\:6789\;10.0.0.17\:6789,if=none,id=drive-virtio-disk0,format=raw,bps_rd=80000000,bps_wr=40000000,iops_rd=400,iops_wr=200 0.9.13 -drive file=rbd:rbd/vmxxxxxxxxx-YSG:id=qemukvm:key=[cut]:auth_supported=cephx:mon_host=10.0.0.13\:6789\;10.0.0.10\:6789\;10.0.0.17\:6789,if=none,id=drive-virtio-disk0,format=raw,bps_rd=80000000,bps_wr=40000000,iops_rd=400,iops_wr=200 In ceph-devel I have mentioned incorrectly that both strings are the same due to incorrect grep statement, so all that needs to be fixed is an wrong parameter at the end. Thanks!

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[libvirt-users] start failure with lxc
by Eric J Nelson 19 Sep '12

19 Sep '12

Hello, I think I've done something to my machine, but I can't seem to figure out what. I have now set up a very simple lxc setup to try and test this. Here is the XML: ~> cat vm1GPU.xml <domain type='lxc'> <name>vm1GPU</name> <memory>1020400</memory> <os> <type>exe</type> <init>/bin/sh</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='bridge'> <source bridge='br0' /> </interface> <filesystem type='mount'> <source dir='/export/vm1gpu/root' /> <target dir='/' /> </filesystem> <console type='pty'/> </devices> </domain> Here is what I get when I try to start it. >sudo virsh --connect lxc:// start vm1GPU error: Failed to start domain vm1GPU error: internal error guest failed to start: 2012-09-19 21:26:48.673+0000: 12702: info : libvirt version: 0.9.10, package: 21.el6_3.4 (CentOS BuildSystem <http://bugs.centos.org>, 2012-08-23-18:28:26, c6b9.bsys.dev.centos.org) 2012-09-19 21:26:48.673+0000: 12702: error : lxcControllerRun:1484 : Failed to query file context on /export/vm1gpu/root: No data available Now if change the target directory to something other than the root it starts right up. Any help would be much appreciated. Thanks! Eric

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[libvirt-users] top output from kvm guest VM
by Harish Patil 19 Sep '12

19 Sep '12

Hello, How can I get 'top' output if the guest VM is stuck spinning and taking 100% cpu. Any other means to debug would be of help. Thanks in adv.

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[libvirt-users] virNodeGetCPUStats and virDomainGetCPUStats have same name in pyton binding as getCPUStats
by Buggi, Harsha 18 Sep '12

18 Sep '12

Hi, virNodeGetCPUStats and virDomainGetCPUStats have same name in pyton binding as getCPUStats virDomainGetCPUStats gets called internally when we use the method getCPUStats. How do we access virNodeGetCPUStats? Regards, Harsha

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[libvirt-users] nwfilter example for security
by Java 18 Sep '12

18 Sep '12

hi, libvirt folks, I'm trying to use libvirt's nwfilter to achieve two goals: 1, by default all ports are closed, means that the virtual machine is isolated. 2, only some selected ports are opened, for example, tcp 22 for ssh, tcp 80 for http web, udp 67 and 68 for dhcp. Can somebody drop me a simple example how to do this in libvirt? I'm using libvirt 0.10.1, the latest version. thanks.

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[libvirt-users] Network inoperable with QEMU arm example image
by Larry Brown 18 Sep '12

18 Sep '12

I posted the following message a few days ago. Does anyone have a minute to look at the output of the troubleshooting tools and advise if they appear correct or if anything stands out as a problem? Or is there another valid direction to go in to find out why the network fails? I'm really stumped here and if there is no other direction to go in I'm dead in the water. So should I just start playing taps? "I am running Fedora 16 64bit and installed libvirt. I have the VM running with arm emulation with this one issue I can't figure out. I used Virtual Machine Manager to manage the VM and can access its console there. The Ethernet appears to be eth1 and the guest can set an IP on it etc. However, I cannot see any traffic from the Host when dumping any of the interfaces. I've tried several combinations of network setups using the GUI and none appear to work. Optimally I'd like to bridge to my primary interface (em1) and be able to pull an address and talk directly to my network so I can download packages etc while in the VM. I tried setting up networking in that fashion with: Source Device : em1 with macvtap Device Model: Hypervisor Default Source Mode: Bridge but alas I cannot pull dhcp nor can I set a static address and ping other interfaces on the network. It also appears that every time I start the VM it creates another vnetX interface. One of the troubleshooting pages I came across listed all the tools but nothing about what to look for: 1) virsh net-list --all Name State Autostart ----------------------------------------- default active yes 2) brctl show bridge name bridge id STP enabled interfaces virbr0 8000.52540029e6c7 yes virbr0-nic vnet0 vnet1 vnet2 vnet3 vnet4 3) sysctl net.bridge.bridge-nf-call-iptables sysctl net.bridge.bridge-nf-call-iptables = 1 4) iptables -L -v -n Chain INPUT (policy ACCEPT 767K packets, 189M bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT udp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:53 0 0 ACCEPT tcp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:53 0 0 ACCEPT udp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:67 0 0 ACCEPT tcp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:67 Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT all -- * virbr0 0.0.0.0/0 192.168.122.0/24 state RELATED,ESTABLISHED 0 0 ACCEPT all -- virbr0 * 192.168.122.0/24 0.0.0.0/0 0 0 ACCEPT all -- virbr0 virbr0 0.0.0.0/0 0.0.0.0/0 0 0 REJECT all -- * virbr0 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable 0 0 REJECT all -- virbr0 * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable Chain OUTPUT (policy ACCEPT 532K packets, 79M bytes) pkts bytes target prot opt in out source destination 5) ps -ef | grep dnsmasq nobody 12382 1 0 Sep11 ? 00:00:00 /usr/sbin/dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/default.pid --conf-file= --except-interface lo --listen-address 192.168.122.1 --dhcp-range 192.168.122.2,192.168.122.254 --dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases --dhcp-lease-max=253 --dhcp-no-override 6) ifconfig -a em1 Link encap:Ethernet HWaddr 00:19:B9:48:2B:BA inet addr:10.45.212.46 Bcast:10.45.212.255 Mask:255.255.255.0 inet6 addr: fe80::219:b9ff:fe48:2bba/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:19048593 errors:95686 dropped:154 overruns:0 frame:98437 TX packets:10619346 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:12559170813 (11.6 GiB) TX bytes:1700214519 (1.5 GiB) Interrupt:16 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:2978074 errors:0 dropped:0 overruns:0 frame:0 TX packets:2978074 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:847201395 (807.9 MiB) TX bytes:847201395 (807.9 MiB) macvtap0 Link encap:Ethernet HWaddr 52:54:00:AC:7F:0C inet6 addr: fe80::5054:ff:feac:7f0c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:294814 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:42804350 (40.8 MiB) TX bytes:468 (468.0 b) virbr0 Link encap:Ethernet HWaddr 52:54:00:29:E6:C7 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:621 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:43217 (42.2 KiB) virbr0-nic Link encap:Ethernet HWaddr 52:54:00:29:E6:C7 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:500 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) vnet0 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:38159 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 b) TX bytes:1995337 (1.9 MiB) vnet1 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:37299 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 b) TX bytes:1949439 (1.8 MiB) vnet2 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:36154 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 b) TX bytes:1888745 (1.8 MiB) vnet3 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:35068 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 b) TX bytes:1832375 (1.7 MiB) vnet4 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:207 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 b) TX bytes:10896 (10.6 KiB) 7) cat /proc/sys/net/ipv4/ip_forward 1 Any help I can get to resolve this would be greatly appreciated. Very frustrating... Larry

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[libvirt-users] network comanline to xml
by basti 18 Sep '12

18 Sep '12

hello, i start a kvm guest with the following comand line: kvm -hda myimage.img -m 1024 -smp 2 \ -net nic -net tap,ifname=tap0,script=no now a plan to start this via libvirt. I have try to set nat via the libvirt-manager but this doesn't connect to network. So i try to use bridge network via the GUI and get a "non supported" error when i use tap0 as "bridge device". How can i "convert" the "-net nic -net tap,ifname=tap0,script=no" to a valid libvirt-xml file? The following example is also buggy: <interface type='network'> <mac address='52:54:00:46:3e:70'/> <source network='default'/> <target dev='tap0'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'$ </interface> thanks

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[libvirt-users] Failed to reboot VM via virsh
by xuanmao_001 18 Sep '12

18 Sep '12

Hi, Eric: I want to reboot vm using libvirt reboot api virDomainReboot(). but it occured error like following: "error: Failed to reboot domain abc" "error: Requested operation is not valid: Reboot is not supported without the JSON monitor". I updated qemu version,such as "qemu-kvm-1.2.0", it still like that. can you give me any ideas? my libvirt version: 0.9.8. thanks. xuanmao_001

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