- Users - libvirt List Archives

[libvirt-users] event handler
by Alexandr 14 Oct '13

14 Oct '13

good day to all. i still have not solved my problem with event handling. currently i have following code void libvirt_eventloop_thr_func() { while(true) //TODO: stop somehow on exit { if(virEventRunDefaultImpl() < 0) { virErrorPtr err = virGetLastError(); fprintf(stderr, "Failed to run event loop: %s\n", err && err->message ? err->message : "Unknown error"); } } } ... virSetErrorFunc(NULL, libvirt_error_handler); libvirt_connection = virConnectOpen("qemu:///system"); if (virEventRegisterDefaultImpl() < 0) { virErrorPtr err = virGetLastError(); fprintf(stderr, "Failed to register event implementation: %s\n", err && err->message ? err->message: "Unknown error"); return -1; } { int callback = virConnectDomainEventRegisterAny(libvirt_connection, NULL, VIR_DOMAIN_EVENT_ID_LIFECYCLE, VIR_DOMAIN_EVENT_CALLBACK(domain_event_handler), NULL, NULL); if(callback == -1) { std::cout<<"Error: failed to register domain event handle callback\n"; return -1; } } boost::thread(boost::bind(&libvirt_eventloop_thr_func)); ... libvirt_eventloop_thr_func() called, and locked on virEventRunDefaultImpl(), can it be called in thread, and if no, how should i use it correctly ? sorry for asking again, but i really can't solve it myself. thx in advance.

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[libvirt-users] migrate & virtlockd
by NEVEU Stephane 14 Oct '13

14 Oct '13

Hi all, I'm testing virtlockd with libvirt 1.1.3 and it seems I can't migrate my VMs from the first to my second kvm node (on a NFS storage). Virtlockd is locking my qcow2 : Error : resource busy Lockspace resource 'ea3jkj78.....' is locked As a result my VM is paused. How can I fix this behavior ? Thank you for your help.

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[libvirt-users] Guide to view the libvirt source.
by cooldharma06 14 Oct '13

14 Oct '13

hi all, i am new to this libvirt. Any guide or reference is available to know more things libvirt (individual programs). because it will give me some idea to get about the libvirt and its corresponding programs. If there is available means please guide and share me. i want to give my contribution to this community. Lot of thanks in advance. Regards, cooldharma06.

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[libvirt-users] migration error virsh 0.10
by song 14 Oct '13

14 Oct '13

Hello everyone: I am using CentOS 6.3 and the libvirt version is 0.10,when I'm trying to migration a vm between hosts,issue command:virsh --connect qemu:///system migrate --live one-11 qemu+ssh://192.168.0.111/system,an error reported: Command "virsh --connect qemu:///system migrate --live one-11 qemu+ssh://192.168.0.111/system" failed: error: XML error: invalid security type Any help will be appreciated!

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[libvirt-users] ps/2 mouse cannot be removed from guest
by Hisao Taguchi 13 Oct '13

13 Oct '13

Hi, I installed Solaris 11(x86_64) as a guest in Fedora 19 KVM host and it works well. It seems that Solaris 11 can recognize only USB mouse but cannot recognize PS/2 mouse. When a PS/2 mouse is attached to the solaris 11 guest, something conflict occured and the mouse pointer is not moving on the solaris desktop. So, I tried to remove the PS/2 mouse from the guest, but I cannot remove it using virt manager. The "remove" button is grayed out by virt manager. I have to edit the /etc/libvirt/qemu/xxx.xml file to remove it. Why is it prevented from removing the PS/2 mouse by virt manager? I hope it wil be fixed. -- hisao

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[libvirt-users] Kvm Libvirt dirty page log facility
by hellen maziku 13 Oct '13

13 Oct '13

Greetings! I am new to kvm Libvirt and are writing a python script to get the number of pre-copy cycles during a remote vm migration given memory size M of a VM in MB, the page dirty rate R of a vm in MB/s. My question is on how to get the page dirty rate. Does kvm libvirt provide a dirty page log facility that provides user space with a bitmap of modified pages since the last call? And if yes, please kindly direct me on how to get started. I have searched and come across things like VIR_NODE_MEMORY_STATS and kvm_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log, int *is_dirty), I do not know if these are the ones and if yes how I can use them. Thank you very much

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[libvirt-users] pom for 0.5.1
by Daan Hoogland 11 Oct '13

11 Oct '13

H, I am using libvirt from maven using a nexus proxy pointing to http://www.libvirt.org/maven2/ It downloads the jar fine but is expecting libvirt-0.5.1.pom (and ...sha1). In the proxy only the jar appears. When I download and rename the pom to my local .m2 cache my build works fine. Is this a bug in the distribution of libvirt in its maven repo or is my dependency wrong somehow? Kind regards, Daan Hoogland

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[libvirt-users] failing connections w/ virt-manager
by Stefan G. Weichinger 09 Oct '13

09 Oct '13

Greetings ... I already spent quite some time to debug this ... See the thread on gentoo-user ml for reference: http://permalink.gmane.org/gmane.linux.gentoo.user/270091 basically I get dropped connections when I try to edit a VM via virt-manager. Tested from my gentoo workstation and a fresh ubuntu installation inside a VM at my office. The server is a new and shiny gentoo box with (gentoo release-numbers): libvirt-1.1.2-r3 qemu-1.5.3 openssh-5.9_p1-r4 ... 64bit, lots of RAM and CPUs .. installed last week ... so no obvious cruft on there. plain ssh sessions work fine for me. I access the server over an IPSEC-VPN terminated on my pfsense-router and on the customers side there is a firewall. This firewall allows full access for my private subnet, TCP/UDP ports 1:65535 ... so there should be no restrictions. Another issue: the server runs with systemd-204-r1 ... maybe important. # systemctl status libvirtd libvirtd.service - Virtualization daemon Loaded: loaded (/usr/lib64/systemd/system/libvirtd.service; enabled) Active: active (running) since Do 2013-10-03 17:39:37 CEST; 13h ago Main PID: 1242 (libvirtd) CGroup: name=systemd:/system/libvirtd.service └─1242 /usr/sbin/libvirtd --listen Okt 03 17:39:38 jupiter libvirtd[1242]: [251B blob data] Okt 03 17:39:38 jupiter libvirtd[1242]: [254B blob data] Okt 03 17:39:38 jupiter libvirtd[1242]: [301B blob data] Okt 03 17:39:38 jupiter libvirtd[1242]: firewall tools were not found or cannot be used Okt 03 17:39:41 jupiter libvirtd[1242]: [338B blob data] Okt 03 17:39:41 jupiter libvirtd[1242]: failed to add iptables rule to allow DHCP requests from 'virbr0' Okt 03 17:41:07 jupiter libvirtd[1242]: No response from client 0x7fe8b0c19450 after 5 keepalive messages in 31 seconds Okt 04 06:35:28 jupiter libvirtd[1242]: No response from client 0x7fe8b0c171a0 after 5 keepalive messages in 32 seconds Okt 04 06:40:05 jupiter libvirtd[1242]: No response from client 0x7fe8b0c164e0 after 5 keepalive messages in 31 seconds Okt 04 06:58:36 jupiter libvirtd[1242]: No response from client 0x7fe8b0c17050 after 5 keepalive messages in 31 seconds What to install for the "firewall tools"? Gentoo didn't pull anything related ... Is that relevant? What about these keepalive messages, I assume this is responsible for my failing virt-manager-connections. Thanks for any help on this, I am quite stuck here already ... Stefan

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[libvirt-users] Testing Xen on Fedora 20...
by Dario Faggioli 08 Oct '13

08 Oct '13

...During today's Fedora 20 Virtualization Test Day: https://fedoraproject.org/wiki/Test_Day:2013-10-08_Virtualization In case anyone is interested, come on #fedora-test-day (on freenode), and feel free to look for and ping me (I'm dariof). I've updated this page with the most current information: http://wiki.xen.org/wiki/Fedora_Test_Days Notice that Fedora 20 will be one of the first mainstream distros shipping Xen 4.3... Let's do all we can for it to work great for all Fedora users!! :-D Thanks and Regards, Dario -- <<This happens because I choose it to happen!>> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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[libvirt-users] @problem in vm while accessing internet
by anagha b 08 Oct '13

08 Oct '13

Hi I am using virt-manager and created bridge at host . My host nw interfaces is auto br0 iface br0 inet static address x.x.x.178 network x.x.x.0 netmask x.x.x.x broadcast gateway x.x.x.x[gateway of eth0 earlier] bridge_ports eth0 bridge_fd 0 bridge_hello 2 bridge_maxage 12 bridge_stp off #dns-search google.com dns-nameservers x.x.x.x x.x.x.x with this config 1] net inside host is working 2]net inside vms created using nat is working but i have to manually ser interface file inside the NATD vm. 3] when i create virtualnetwork in routed mode using shared physical device br0 and assign vm to it the net inside vm not working . 4] created virtual network using only routed mode with any physical device instaead og br0 still net inside vm not working. I followed documentation on libvirt site . I want vms indifferent nw should communicate with each other like net1 and vm1 can ping vm2 in net2 .

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[libvirt-users] (Xen + libvirt) Installing and workin with xen -4.2.1 and libvirt 1.1.2
by cooldharma06 08 Oct '13

08 Oct '13

hi i want to install libvirt-1.1.2 in xen -4.2.1. i installed int he following manner: 1. downloaded source from libvirt/org (libvirt-1.1.2) 2. untarred & run ./configure --with-xen=yes --with-libxl=yes 3. then make and make install. i also enabled the (xend-unix-server yes) in xend config file. i run libvirtd -v and getting the followning error: root@boss[libexec]#libvirtd -v 2013-09-27 07:24:46.501+0000: 29517: info : libvirt version: 1.1.2 2013-09-27 07:24:46.501+0000: 29517: error : libxlCapsInitHost:86 : internal error: Failed to get node physical info from libxenlight 2013-09-27 07:24:46.501+0000: 29517: error : libxlStateInitialize:1362 : cannot create capabilities for libxenlight 2013-09-27 07:24:46.502+0000: 29517: error : virStateInitialize:840 : Initialization of LIBXL state driver failed: internal error: Failed to get node physical info from libxenlight 2013-09-27 07:24:46.502+0000: 29517: error : daemonRunStateInit:909 : Driver state initialization failed If i missed anything in the installation plz correct me. and guide me to solve this error. regards, cooldharma06.

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Re: [libvirt-users] Automatically assign static ipv4 via dhcp to new VMs (Tim)
by Chandana De Silva 07 Oct '13

07 Oct '13

You can do this with the built in dhcp server for the virtual network. The definition is passed to dnsmasq. ... <ip address="192.168.122.1" netmask="255.255.255.0"> <dhcp> <range start="192.168.122.100" end="192.168.122.254" /> <host mac="00:16:3e:e2:ed" name="foo.example.com" ip="192.168.122.10" /> </dhcp> </ip> ... See : http://wiki.libvirt.org/page/VirtualNetworking#XML_format On 05/10/13 20:50, libvirt-users-request(a)redhat.com wrote: > 1. Automatically assign static ipv4 via dhcp to new VMs (Tim) > Subject: [libvirt-users] Automatically assign static ipv4 via dhcp to > new VMs > Message-ID: <524EE851.2010009(a)online-mail.biz> > Content-Type: text/plain; charset=ISO-8859-15 > > Hi guys, > > > What I would like to do: > > 1) Right know it seems like dnsmasq assigns ip-addresses randomly to > VMs, is there any way to assign them in ascending order? > > 2) IPs are not statically assigned. Is it possible to add something like > this automatically at the first VM-start to the xml definition?: > <host mac='AA:BB:CC:DD:EE:FF' ip='192.168.122.2' name='foobar'/> >

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[libvirt-users] network filter and openvswitch bridge
by Pavel Tokarev 07 Oct '13

07 Oct '13

Hello all! I try to use network filters for openvswitch interfaces. This is the xml configuration of my bridge interface <interface type='bridge'> <mac address='00:11:22:33:44:55'/> <source bridge='virbr1'/> <virtualport type='openvswitch'> <parameters interfaceid='0529d6b5-627c-4330-803f-0d7018e6d496'/> </virtualport> <model type='virtio'/> <filterref filter='myfilter'> <parameter name='IP' value='10.10.10.99'/> </filterref> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </interface> The filter 'myfilter' is defined. If I start a domain with this interface all ports are correctly added to the 'virbr1' bridge, plus libvirt creates firewall rules using ebtables tool. BUT ebtables controls linux bridges, not openvswich bridges. As far as I know OVS has its own tool to create firewall rules for its bridges - ovs-ofctl. How to make libvirt to use the right tool for creating firewall rules for OVS bridges? If I remove ebtables tool and try to start the domain, libvirt complains "cannot create rule since ebtables tool is missing." Thank you.

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[libvirt-users] libvirt crash when using libxl (xen 4.3)
by dienet 06 Oct '13

06 Oct '13

Hi I was trying out the libxl backend of xen 4.3 with libvirt, but I found it very unstable and unusable. I'm in xen 4.3 dom0 and starting: 1. xen stuff: echo "Starting Xen..." /etc/init.d/xencommons start #/etc/init.d/xend start . /etc/rc.d/rc.xen_bridge start /etc/init.d/xendomains start #libvirtd -l -d hsflowd 2. Starting libvirt -v to see what is going on. After that I'm using virsh to do some simple tasks: virsh # list Id Name State ---------------------------------------------------- Where is dom0? virsh # create debian_pv.xml error: Failed to create domain from debian_pv.xml error: End of file while reading data: Input/output error error: One or more references were leaked after disconnect from the hypervisor error: Failed to reconnect to the hypervisor And log from libvirt: 2013-10-06 11:24:17.693+0000: 2162: debug : remoteDispatchDomainCreateXMLHelper:3017 : server=0x7fe92c017760 client=0x7fe92c029970 msg=0x7fe92c029520 rerr=0x7fe92511bd50 args=0x7fe90c000af0 ret=0x7fe90c000930 2013-10-06 11:24:17.693+0000: 2162: debug : virDomainCreateXML:1996 : conn=0x7fe904000a80, xmlDesc=<domain type='xen'> <name>debian_pv</name> <uuid>4590a985-69c1-4407-8517-da3da4673d9b</uuid> <memory unit='KiB'>262144</memory> <currentMemory unit='KiB'>262144</currentMemory> <vcpu placement='static' cpuset='1'>1</vcpu> <bootloader>pygrub</bootloader> <os> <type arch='x86_64' machine='xenpv'>linux</type> </os> <clock offset='utc' adjustment='reset'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <disk type='file' device='disk'> <driver name='file'/> <source file='/root/vms/debian_pv/debian_pv.img'/> <target dev='sda' bus='xen'/> </disk> <interface type='bridge'> <mac address='00:16:3e:59:78:01'/> <source bridge='xenbr0'/> </interface> <console type='pty'> <target type='xen' port='0'/> </console> <input type='mouse' bus='xen'/> <graphics type='vnc' autoport='no' listen='0.0.0.0'> <listen type='address' address='0.0.0.0'/> </graphics> </devices> </domain> , flags=0 2013-10-06 11:24:17.693+0000: 2162: debug : virObjectRef:293 : OBJECT_REF: obj=0x7fe914075300 2013-10-06 11:24:17.694+0000: 2162: debug : virObjectRef:293 : OBJECT_REF: obj=0x7fe92c012fb0 2013-10-06 11:24:17.694+0000: 2162: debug : virAccessManagerCheckDomain:231 : manager=0x7fe92c012fb0(name=stack) driver=xenlight domain=0x7fe90c009130 perm=2 2013-10-06 11:24:17.694+0000: 2162: debug : virAccessManagerCheckDomain:231 : manager=0x7fe92c017360(name=none) driver=xenlight domain=0x7fe90c009130 perm=2 2013-10-06 11:24:17.694+0000: 2162: debug : virAccessManagerCheckDomain:231 : manager=0x7fe92c012fb0(name=stack) driver=xenlight domain=0x7fe90c009130 perm=4 2013-10-06 11:24:17.694+0000: 2162: debug : virAccessManagerCheckDomain:231 : manager=0x7fe92c017360(name=none) driver=xenlight domain=0x7fe90c009130 perm=4 2013-10-06 11:24:17.694+0000: 2162: debug : virObjectUnref:256 : OBJECT_UNREF: obj=0x7fe92c012fb0 2013-10-06 11:24:17.694+0000: 2162: debug : virObjectNew:199 : OBJECT_NEW: obj=0x7fe90c002d10 classname=virDomainObj 2013-10-06 11:24:17.694+0000: 2162: debug : virObjectNew:199 : OBJECT_NEW: obj=0x7fe90c005b60 classname=libxlDomainObjPrivate 2013-10-06 11:24:17.694+0000: 2162: debug : virDomainObjNew:2063 : obj=0x7fe90c002d10 2013-10-06 11:24:17.694+0000: 2162: debug : virObjectRef:293 : OBJECT_REF: obj=0x7fe914075300 2013-10-06 11:24:17.694+0000: 2162: debug : virObjectRef:293 : OBJECT_REF: obj=0x7fe914075300 2013-10-06 11:24:17.694+0000: 2162: debug : virObjectUnref:256 : OBJECT_UNREF: obj=0x7fe914075300 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollCleanupTimeouts:517 : Cleanup 2 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollCleanupHandles:565 : Cleanup 11 2013-10-06 11:24:17.694+0000: 2158: debug : virEventRunDefaultImpl:271 : running default event implementation 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollCleanupTimeouts:517 : Cleanup 2 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollCleanupHandles:565 : Cleanup 11 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollMakePollFDs:394 : Prepare n=0 w=1, f=5 e=1 d=0 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollMakePollFDs:394 : Prepare n=1 w=2, f=7 e=1 d=0 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollMakePollFDs:394 : Prepare n=2 w=3, f=9 e=1 d=0 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollMakePollFDs:394 : Prepare n=3 w=4, f=10 e=1 d=0 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollMakePollFDs:394 : Prepare n=4 w=5, f=11 e=1 d=0 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollMakePollFDs:394 : Prepare n=5 w=6, f=12 e=1 d=0 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollMakePollFDs:394 : Prepare n=6 w=7, f=13 e=0 d=0 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollMakePollFDs:394 : Prepare n=7 w=8, f=13 e=1 d=0 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollMakePollFDs:394 : Prepare n=8 w=9, f=14 e=1 d=0 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollMakePollFDs:394 : Prepare n=9 w=34, f=21 e=1 d=0 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollMakePollFDs:394 : Prepare n=10 w=36, f=22 e=1 d=0 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollCalculateTimeout:332 : Calculate expiry of 2 timers 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollCalculateTimeout:340 : Got a timeout scheduled for 1381058662693 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollCalculateTimeout:353 : Schedule timeout then=1381058662693 now=1381058657694 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollCalculateTimeout:362 : Timeout at 1381058662693 due in 4999 ms 2013-10-06 11:24:17.694+0000: 2158: debug : virEventPollRunOnce:630 : EVENT_POLL_RUN: nhandles=10 timeout=4999 2013-10-06 11:24:17.707+0000: 2162: debug : virFileClose:90 : Closed fd 28 2013-10-06 11:24:17.726+0000: 2162: error : libxlVmStart:627 : internal error: libxenlight failed to create new domain 'debian_pv' 2013-10-06 11:24:17.726+0000: 2162: debug : virObjectUnref:256 : OBJECT_UNREF: obj=0x7fe914075300 2013-10-06 11:24:17.726+0000: 2162: debug : virObjectRef:293 : OBJECT_REF: obj=0x7fe90c002d10 2013-10-06 11:24:17.726+0000: 2162: debug : virObjectUnref:256 : OBJECT_UNREF: obj=0x7fe90c002d10 2013-10-06 11:24:17.726+0000: 2162: debug : virObjectUnref:256 : OBJECT_UNREF: obj=0x7fe90c002d10 2013-10-06 11:24:17.726+0000: 2162: debug : virObjectUnref:258 : OBJECT_DISPOSE: obj=0x7fe90c002d10 2013-10-06 11:24:17.726+0000: 2162: debug : virDomainObjDispose:2029 : obj=0x7fe90c002d10 2013-10-06 11:24:17.727+0000: 2162: debug : virObjectUnref:256 : OBJECT_UNREF: obj=0x7fe90c005b60 2013-10-06 11:24:17.727+0000: 2162: debug : virObjectUnref:258 : OBJECT_DISPOSE: obj=0x7fe90c005b60 ====== end of log ===== Segmentation fault Why crash? Am I doing something wrong? -- pozdr0 dienet "Old C programmers never die. They're just cast into void."

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[libvirt-users] Bringing up a guest with network disabled
by James Gibbon 05 Oct '13

05 Oct '13

Hello all, I have a KVM guest VM which is a clone of a production machine running on a different physical server, incarnated from an image backup. I want to start up the clone, but obviously it has the same IP address at the moment, and naturally I want to avoid an IP conflict. Normally I'd mount the clone image, go in and change the network config to allocate a different IP, but because it's set up with its whole disk as a LVM that's a bit painful. Is there a simple way I can disable the networking for the guest clone in the config file, so I can VNC into its console and change its IP address config that way? The devices section of the config looks like this: <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='raw' cache='writeback'/> <source file='/var/lib/libvirt/images/sonic2.img'/> <target dev='hda' bus='ide'/> </disk> <interface type='bridge'> <mac address='0A:F7:B6:96:BF:85'/> <source bridge='br0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target port='0'/> </console> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5937' autoport='no' keymap='en-gb'/> </devices> .. can I change that 'interface type' value to disable its interface? Thanks, James

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[libvirt-users] Changing test_driver.c file
by Arun Viswanath 05 Oct '13

05 Oct '13

Hi All, For some testing purpose I've changed some content in src/test/test_driver.c and then used "make" command to compile and build the code. Then I copied the "libvirt.so.0.9.10.so" file to the target machine and restart the libvirtd daemon, but the changes I made in test_driver.c is nothing reflected. I'm not sure whether I'm missing something. Is it moving only the "libvirt.so.0.9.10.so" is enough or I need to move some .a files ? , but I'm not seeing any ".a" in the kvm host related to libvirt to replace. Please provide me sufficient info to proceed further. Thanks In Advance, Arun V

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[libvirt-users] Xen Project Developer Summit: check the schedule and register!
by Dario Faggioli 05 Oct '13

05 Oct '13

Hi all, The program for the Xen Project Developer Summit 2013 has been announced! Get more details at the links below: xendevelopersummit2013.sched.org/ http://blog.xen.org/index.php/2013/10/02/xen-project-developer-summit-line-… http://events.linuxfoundation.org/events/xen-project-developer-summit Don't miss the opportunity to come and see what's going on in the Xen Project's community. Register and join us in Edinburgh! Regards, Dario -- <<This happens because I choose it to happen!>> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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[libvirt-users] passthrough shared dir with kvm: need to run as root?
by Raphael Bauduin 03 Oct '13

03 Oct '13

Hi, I need to mount a directory from the host in a guest, with passthough (ie, owner id and group set in the guest should be preserved and written on the host). I've read that for this to work, qemu needs to be run as root. Is there a way to start qemu as root via libvirt? Thanks raph

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[libvirt-users] Snapshots: Where they are stored and how to use them?
by Roland Giesler 03 Oct '13

03 Oct '13

Firstly I'd like to learn where a snapshot is stored once it has been made. I understand that the principle is that when changes occur in the VM, the difference is written to the snapshot, thus recording the differences between the date/time of the snapshot and the current value of the VM. Is that a correct assessment of the process? If that is indeed so, can I take regular snapshots and back then up onto external storage to provide a sort of system restore point at certain times in the past? I have scanned the server hard disks for the snapshot images after running "sudo virsh snapshot-create Windows /etc/libvirt/snapshot.xml" and the system reports a snapshot was taken, yet I cannot find any file that contains the snapshot. $ sudo virsh snapshot-list Windows Name Creation Time State ------------------------------------------------------------ Windows 2013-10-02 12:41:06 +0200 running What will happen to the snapshot if the host server is restarted? Some insight would be greatly appreciated. regards Roland

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[libvirt-users] Bridging Wireless Cards for KVM
by Joshua McKee 03 Oct '13

03 Oct '13

Hi, I hope this is the right place to ask this question. I was wondering if there is a way to set up a KVM VM using an XML document as input into Virsh that uses bridged networking over a wireless card. I understand that wireless cards to not natively support, but I was able to find a working solution here: http://blog.ericwhite.ca/articles/2011/04/creating-a-wireless-bridge/. The issue is, I can use this bridge by calling KVM directly. However, I cannot figure out how to get this same configuration on an XML file that I input into Virsh for the creation of a VM. My understanding is that libvirt calls KVM/QEMU at some point, but I may be mistaken. Thanks, Joshua

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[libvirt-users] Accessing the host server's file system from a guest OS
by Roland Giesler 03 Oct '13

03 Oct '13

Is there no way in which one can access the host's filesystem from within a guest OS. Libvirt's virt-manager GUI seems to indicate that there is, by virtue of the FileSystem Passthrough option as shown below [image: Inline image 1] The scenario I typically have is a Linux Server on a ext4 file system, with a Windows 7 Guest OS running a KVM machine. No matter what combination of options I choose, I can never "mount" the host drive in Windows to be able to transfer files from one to the other. Both VMWare Player and Virtualbox have this capability, yet I find this sorely lacking in libvirt/virt-manager. What do I need to do to make this work? regards Roland

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[libvirt-users] libvirt installtion.
by cooldharma06 01 Oct '13

01 Oct '13

hi, i am facing some error i am not able to find how to solve this. i just explain my whole things. i installed libvirt 1.1.2 from source under /opt/ folder. ./configure --with-xen=yes, make , make install. i faced some internal error so runned make clean , make distclean under libvirt source folder. then agian i tried to install libvirt 1.1.2 ./configure --prefix=/usr --localstatedir=/var --sysconfdir=/etc --with-xen=yes --with-libxl=yes make make install. i faced some error. i mailed those error in my previous mail. then i cleared (removed by make clean) the libvirt 1.1.2 and i tried to install the libvirt 1.1.1 with the following commands: ./configure --prefix=/usr --localstatedir=/var --sysconfdir=/etc --with-xen=yes make make install i am getting the below error. root(a)boss[libvirt-1.1.1]#libvirtd -v libvirtd: /usr/local/lib/libvirt.so.0: version `LIBVIRT_PRIVATE_1.1.1' not found (required by libvirtd) give me some solution to solve the above error.. regards, cooldharma06.

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[libvirt-users] LXC, libvrt-1.1.2-r3 (Gentoo), "/dev/tty12", mount /dev with inverse of 'nodev'?
by Dennis Jenkins 01 Oct '13

01 Oct '13

Hello again, TL;DR: Today I noticed that my LXC container was out of space in "/dev". It took me a few minutes to figure out why. There were only 23 files there. The "/dev" fs quota was 64K, and all was taken up. The problem was that "syslog-ng" was writing "console" messages to "/dev/tty12". But "/dev/tty12" was not a device node, so the kernel "(2)open"ed it as a file and dutifully wrote to it. I have corrected my syslog-ng config, but I was wondering.... Is there any legitimate reason to EVER have a regular file in "/dev"? If not, can libvirt or Linux be modified so that the filesystem can be mounted in such a way to prevent a regular file from ever being created there? Kind of like an inverse of the "nodev" mount option seen in various filesystems (ext3, nfs). IMHO, I would rather have syslog-ng (or other tool) fail to open a regular file in "/dev", than for it is succeed and then fill up the small fs. Thoughts? Boring stuff: Sep 30 14:06:47 localhost syslog-ng[440]: Error suspend timeout has elapsed, attempting to write again; fd='16' Sep 30 14:06:47 localhost syslog-ng[440]: I/O error occurred while writing; fd='16', error='No space left on device (28)' Sep 30 14:06:47 localhost syslog-ng[440]: Suspending write operation because of an I/O error; fd='16', time_reopen='60' This is what I see inside the container: djenkins@dwj-hfax-dev ~/src/HylaFAX+ $ find /dev | wc -l 23 dwj-hfax-dev ~ # ls -l /dev/tty* crw-rw-rw- 1 root root 5, 0 Sep 30 13:44 /dev/tty lrwxrwxrwx 1 root root 10 Sep 30 13:03 /dev/tty1 -> /dev/pts/0 -rw------- 1 root root 65536 Sep 30 14:12 /dev/tty12 ### AHHH!!! There is the problem. "syslog-ng" is writing to "/dev/tty12", but it is a file and not a real device. djenkins@dwj-hfax-dev ~/src/HylaFAX+ $ du -sh /dev 64K /dev djenkins@dwj-hfax-dev ~/src/HylaFAX+ $ df -h /dev Filesystem Size Used Avail Use% Mounted on devfs 64K 64K 0 100% /dev

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[libvirt-users] Unable to start libvirt_lxc domain a second time after shutdown
by Florian Klink 01 Oct '13

01 Oct '13

Hi, I'm unable to start a lxc domain again after shutting it down. Something doesn't seem to "clean up" the socket file (and probably more), as the error message says "Unable to start Domain: Failed to connect socket to '/var/run/libvirt/lxc/test.sock': Connection refused." I can create a domain with the same config as the one thats shutted down, but with other uid and name, of course, and I'm able to boot up this domain. However, the init process is much shorter (some filesystems are not mounted), so maybe there is still something left "open" after the lxc container is shut down? I saw the problem in libvirt 1.1.2 and current git (1.1.3-rc2 plus 7 commits, on 51e21ba7b6f59d6ad9339b2da2b75cc7704f9ecf) Configuration is something like this: <domain type='lxc'> <name>test</name> <memory unit='KiB'>1048576</memory> <currentMemory unit='KiB'>1048576</currentMemory> <vcpu placement='static'>1</vcpu> <resource> <partition>/machine</partition> </resource> <os> <type arch='x86_64'>exe</type> <init>/sbin/init</init> </os> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/lib/libvirt/libvirt_lxc</emulator> <filesystem type='mount' accessmode='passthrough'> <source dir='/var/lib/libvirt/filesystems/test/root'/> <target dir='/'/> </filesystem> <interface type='network'> </interface> <console type='pty'> <target type='lxc' port='0'/> </console> </devices> <seclabel type='none'/> </domain> Florian

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[libvirt-users] Does libvirt support xapi/xe toolstack?
by Guillaume Thouvenin 01 Oct '13

01 Oct '13

Hello, I installed the last version of Xen (xenserver-core-0.9.0-9.x86_64 from yum) and I'm trying to manage my VMs with virsh. The version that I installed is using the Xapi/xe toolstack. The problem I have is that I'm not seeing the VM that is started with "virsh -c xen:/// list --all". Here is what I have: root# xe vm-list uuid ( RO) : 022226ed-07be-37fc-5b52-f798320e2726 name-label ( RW): vm1 power-state ( RO): running uuid ( RO) : 394fa633-f600-45f9-bea7-3bf4a9fd06fd name-label ( RW): Control domain on host: unknown power-state ( RO): running root# virsh -c xen:/// list --all Id Name State ---------------------------------------------------- # According to [1] it seems that libvirt is using Xend daemon to communicate. The problem is that Xend is now deprecated since Xen 4.1. So am I wrong with this assumption or is there something to configure to be able to use libvirt with Xapi/XE toolstack? I looked in the documentation but I only found [2] but I didn't see any special settings... Regards, Guillaume [1] http://libvirt.org/architecture.html [2] http://libvirt.org/drvxen.html

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