- Users - libvirt List Archives

[libvirt-users] Restarting network on host completely cuts off guests. Why? How to prevent?
by Andreas Ntaflos 19 Apr '10

19 Apr '10

Hi list, this probably isn't a completely libvirt-specific question but I'll try anyway. Please ignore if it is too much off-topic. On an Ubuntu (9.10) virtualisation host, running KVM and libvirt and several guests (Debian, Ubuntu, Windows Server 2003) in a bridged network fashion [1,2] I noticed that performing /etc/init.d/networking restart on the host completely cuts off all guests from the network. I have to manually shutdown and restart (virsh shutdown GUEST && virsh start GUEST, a mere reboot doesn't suffice) them to get them onto the network again. Obviously that's not ideal. Is this the expected behaviour? Can I somehow re-establish guest network connectivity without shutting down the guest first? Is my setup somehow wrong or do I expect too much? Any insight, explanation or pointers would be much appreciated! Thanks, Andreas [1] http://wiki.libvirt.org/page/Networking#Debian.2FUbuntu_Bridging [2] http://wiki.libvirt.org/page/Networking#Guest_configuration_2 -- Andreas Ntaflos GPG Fingerprint: 6234 2E8E 5C81 C6CB E5EC 7E65 397C E2A8 090C A9B4

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[libvirt-users] Libvirt Compilation on MS Vista
by Development 19 Apr '10

19 Apr '10

Does a comprehensive set of instructions on how to compile Libvirt on a Microsoft Vista platform exist? Has this ever been accomplished? I would very much appreciate input from persons who can give me confidence that a Windows client application can be developed on top of Libvirt that connects to a QEMU system on an Ubuntu server. The Libvirt Windows Support page (http://libvirt.org/windows.html) implies the exercise is trivial. Over the last three weeks of failure I have come to find this assertion extremely amusing. Tim McLeod Simulamen Limited Registered in England No: 7133731

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[libvirt-users] Libvirt Compilation on MS Vista
by Tim McLeod 19 Apr '10

19 Apr '10

Does a comprehensive set of instructions on how to compile Libvirt on a Microsoft Vista platform exist? Has this ever been accomplished? I would very much appreciate input from persons who can give me confidence that a Windows client application can be developed on top of Libviet that connects to a QEMU system on an Ubuntu server. The Libvirt Windows Support page (http://libvirt.org/windows.html) implies the exercise is trivial. Over the last three weeks of failure I have come to find this assertion extremely amusing. Tim McLeod Simulamen Limited Registered in England No: 7133731

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[libvirt-users] That the Linux bridge configuration does not work afer I upgraded the kernel to 2.6.33.2.
by Frank Peng 19 Apr '10

19 Apr '10

Hello, When I use a standard Redhat kernel, it's ok. Everything's working right. That the Linux bridge configuration does not work afer I upgraded the kernel to 2.6.33.2. Why? [root@node78 ~]# cat /etc/issue Red Hat Enterprise Linux Server release 5.5 (Tikanga) Kernel \r on an \m [root@node78 ~]# uname -a Linux node78 2.6.33.2 #1 SMP Wed Apr 14 10:10:29 CST 2010 x86_64 x86_64 x86_64 GNU/Linux [root@node78 ~]# cat /etc/sysconfig/selinux # This file controls the state of SELinux on the system. # SELINUX= can take one of these three values: # enforcing - SELinux security policy is enforced. # permissive - SELinux prints warnings instead of enforcing. # disabled - SELinux is fully disabled. SELINUX=disabled # SELINUXTYPE= type of policy in use. Possible values are: # targeted - Only targeted network daemons are protected. # strict - Full SELinux protection. SELINUXTYPE=targeted [root@node78 ~]# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination [root@node78 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 # Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper) DEVICE=eth0 HWADDR=00:15:17:11:16:18 BRIDGE=br0 NM_CONTROLLED=no ONBOOT=yes [root@node78 ~]# cat /etc/sysconfig/network-scripts/ifcfg-br0 DEVICE=br0 TYPE=Bridge BOOTPROTO=static BROADCAST=192.168.0.255 IPADDR=192.168.0.78 NETMASK=255.255.255.0 NETWORK=192.168.0.0 DELAY=0 NM_CONTROLLED=no ONBOOT=yes [root@node78 ~]#cd /usr/src/ [root@node78 ~]#tar jxf linux-2.6.33.2.tar.bz2 [root@node78 ~]#ln -s linux-2.6.33.2 linux [root@node78 ~]#cd linux [root@node78 ~]#cp /boot/config-2.6.18-164.el5 /usr/src/linux-2.6.33.2/.config [root@node78 ~]#make menuconfig (add the option "enable deprecated sysfs feathures to support old userspace tools") [root@node78 ~]#make && make modules && make modules_install && make install [root@node78 ~]# ifconfig br0 Link encap:Ethernet HWaddr 00:15:17:11:16:18 inet addr:192.168.0.78 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::215:17ff:fe11:1618/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:7217 errors:0 dropped:0 overruns:0 frame:0 TX packets:273 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:738606 (721.2 KiB) TX bytes:36168 (35.3 KiB) eth0 Link encap:Ethernet HWaddr 00:15:17:11:16:18 inet6 addr: fe80::215:17ff:fe11:1618/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:7490 errors:0 dropped:0 overruns:0 frame:0 TX packets:304 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:866112 (845.8 KiB) TX bytes:42312 (41.3 KiB) Memory:b8820000-b8840000 eth1 Link encap:Ethernet HWaddr 00:15:17:11:16:19 inet addr:10.0.7.78 Bcast:10.255.255.255 Mask:255.0.0.0 inet6 addr: fe80::215:17ff:fe11:1619/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:4 errors:0 dropped:0 overruns:0 frame:0 TX packets:59 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1056 (1.0 KiB) TX bytes:10982 (10.7 KiB) Memory:b8800000-b8820000 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:1831 errors:0 dropped:0 overruns:0 frame:0 TX packets:1831 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:3576260 (3.4 MiB) TX bytes:3576260 (3.4 MiB) [root@node78 ~]# ifconfig vmbr0 vmbr0: error fetching interface information: Device not found Best Regards, Frank

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[libvirt-users] STP default behavior for bridged (off) and NAT (on) networking in libvirt
by Francesco Pretto 18 Apr '10

18 Apr '10

Hello, when talking about networking in hypervisors, it's easy to distinguish the two classic configurations, NAT and bridged, and the official libvirt wiki does exactly in this way here [1]. NAT networking is already configured by libvirt creating a bridge called libvirt0, while bridged networking have to be configured manually by the user. The libvirt0 bridge for NAT networking is default configured in this way: STP=on MAXWAIT=0 While suggested br0 bridge for bridged networking is configured in this way: STP=off MAXWAIT=5 Please, can you explain me why STP is on for NAT and should be off for bridged networking? It seems much easier to me to create loops when using bridged networking than NAT. Moreover, reading this old debian bug about complaints of MAXWAIT != 0 when STP off, I'm wondering if the suggested configurations aren't actually switched. Thanks, Francesco [1] http://wiki.libvirt.org/page/Networking [2] http://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg700924.html

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[libvirt-users] Default network needed?
by Andreas Ntaflos 18 Apr '10

18 Apr '10

Hi list, long(ish) time libvirt users, first time poster. Question: Is the default network (192.168.122.0/24, NAT) created by libvirt needed at all when guests are connected to the host's bridge device (and not the default network) I.e. when I have <interface type='bridge'> <source bridge='br0'/> <model type='virtio'/> </interface> in my guest definition is the default network ever even used? Or can I safely remove it? This may be a naive or stupid question but I have not found a definitive answer studying the documentation. Can anybody enlighten me? Thanks, Andreas -- Andreas Ntaflos GPG Fingerprint: 6234 2E8E 5C81 C6CB E5EC 7E65 397C E2A8 090C A9B4

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[libvirt-users] Libvirtd
by marwen marwen 16 Apr '10

16 Apr '10

hello, I'm using libvirt for my project but i have some problem when we install it (libvirt) can you give me a manual for installation of libvirt and configuration of libvirtd think you so much

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[libvirt-users] from vmdk to kvm
by Valerio Felici 13 Apr '10

13 Apr '10

Hi, I will try to explain my case, I hope this is rigth place to do it. My goal is migrate an Ubuntu 9.10 64bit VMWare VM from a Win2k8 64bit server to an Ubuntu 9.10 64bit server. Following some tutorials I've got a .qcow2 file from .vmdk and a .xml file from .vmx file Running virsh define/start all was fine, but VM is unaccessible: no ping, no ssh, also from hosting server. This is content of .xml file <domain type='kvm'> <name>Ubuntu9.04-Zimbra</name> <uuid>7f86897d-5eac-47d6-970d-c2639d58c340</uuid> <memory>2621440</memory> <currentMemory>2621440</currentMemory> <vcpu>1</vcpu> <os> <type arch='x86_64' machine='pc-0.11'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file' device='disk'> <source file='/opt/Plone/Ubuntu9.04-Zimbra.qcow2'/> <target dev='hda' bus='ide'/> </disk> <interface type='bridge'> <mac address='00:0c:29:82:5c:36'/> <source bridge='br0'/> <model type='virtio'/> </interface> <interface type='bridge'> <mac address='00:0c:29:82:5c:40'/> <source bridge='br0'/> <model type='virtio'/> </interface> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'/> <video> <model type='cirrus' vram='9216' heads='1'/> </video> </devices> </domain> Starting VM, corrisponding on two interfaces declared, vnet1 e vnet2 are showed in ifconfig (vnet0 is for another VM) but "brctl showmacs br0" don't show their MACs What I wrong? Thanks for your attention, sorry if I missing to post some useful data, please tell me, what you need. -- A presto -Valerio-

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[libvirt-users] libvirt: C++ or Java?
by Ganesh Pagade 12 Apr '10

12 Apr '10

Hello, I am planning to develop a management application for managing Redhat Xen and Redhat KVM hypervisors. I am evaluating the Java bindings versus the C++ version of libvirt. As part of evaluation, I could not find meaningful answers to the questions below. Hence, I thought that people on this mailing list would be the most appropriate to comment on them. Can you please let me know your views? 1. Are all functions that are available in C API available in Java? 2. Are Java bindings added along with every enhancement to C API? 3. If answer to above question is negative, typically how long does it takes for the addition of Java bindings for the enhancement? 4. Most of libvirt based third party management applications use which of Java bindings or C API? 5. What are your good/bad experiences while using either of C API or Java bindings? 6. What is your concluding personal recommendation? And finally, since libvirt is a Redhat Emerging Technology project, does Redhat or any other third party service providers provide paid assistance, support? Appreciate your time. Thanks. Regards, Ganesh

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[libvirt-users] virt-top not showing disk and network usage
by Neil Aggarwal 11 Apr '10

11 Apr '10

Hello: I installed virt-top from epel onto my CentOS 5.4 host running KVM. When I run virt-top, it shows me the CPU and memory usage of the VMs, but the disk and network colums are empty. I found this page: http://people.redhat.com/~rjones/virt-top/faq.html That states it depends on what is supported by libvirt and the hypervisor. Is this implemented in KVM? If not, anyone have any info on when it will be? Thanks, Neil -- Neil Aggarwal, (281)846-8957 FREE trial: cPanel VPS with unmetered bandwidth http://UnmeteredVPS.net/cpanel

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