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[libvirt-users] domain xml <video> doubt
by llilulu 27 Sep '17

27 Sep '17

Hi My libvirt is 3.4.0,When I create a kvm domain, I use default <video> (type=cirrus, I not set video) create guest(debian9.1.0), but when finish install the guest and reboot, the guest will block in "started update utmp about system runlevel changes", I search on Internet, and find is graphics card problem, I change the <video> type=vga, the problem disppear。The domain xml docs say， I can set type=qxl, ...， but qemu -vga args has other type support, (qemu --help, -vga [std|cirrus|qxl....), I want to know how I use other <video> type in my domain xml. Thanks very!!!

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[libvirt-users] Rollback to running VM
by Jackson, Gary L. 26 Sep '17

26 Sep '17

I would like to make a snapshot of a running VM, let it continue to run after the shapshot, and then at some later time roll back the VM to that previous running state. Can I do that with libvirt? If so, how? I understand that this will cause all kinds of havoc with things like ongoing TCP connections, and I accept that risk. -- Gary Jackson

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[libvirt-users] How could I set a VNC server's screen size?
by 刘磊 22 Sep '17

22 Sep '17

Dear Libvirt, How could I set a VNC server’s screen size? I access my virtual machine via NoVNC from web browser, but the desktop’s size is different based on OS. For example, A RHEL5’s screen is about half of RHEL7’s. But it has same graphics configuration. I read the online doc, but I don’t find any to set this. So could you help me? Thanks for your reply. Best Regards, Clark Liu

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[libvirt-users] How automatically set group.devices.allow for libvirt-lxc container after start ?
by mxs kolo 21 Sep '17

21 Sep '17

Hi. I need to use /dev/ppp inside the lxc container, for very ancient software. Problem solved this way: 1) virsh edit container name and add section: <features> <capabilities policy='default'> <mknod state='on'/> </capabilities> </features> 2) start container 3) attach or ssh container, be root: #mknod /dev/ppp c 108 0 4) inside container (or from hardware node, no difference) run: # echo "c 108:0 rwm" > /sys/fs/cgroup/devices/machine.slice/machine-lxc\\x2d${PID}\\x2d${CONTAINER_NAEM}scope/devices.allow 5) Now pppd work inside lxc: #pppd call reuters debug nodetach using channel 1 Using interface ppp0 Connect: ppp0 <--> /dev/pts/2 sent [LCP ConfReq id=0x1 <mru 1000> <asyncmap 0x0> <magic 0x567d90ae>] ... But such method has several drawbacks. 1) I do not want to give cap_mknod, no need extra holes. With cap_mknod you can make /de/block_device and using device.allow to give it the rights rwm. 2) libvirt-lxc has some analog of lxc/lxd options lxc.group.devices.allow ? lxc.cgroup.devices.allow = c 108:0 rwm And yes, I need run "mknod" and "echo" each time after container restart and before start pppd daemon inside. p.s. It would be nice specify any device in the xml domain config, for example: <devices> <device type='char' maj='108' min='0' allow='rwm' name="/dev/ppp"/> </devices> At start libvirt executes mknod and then writes the necessary rights to cgroups device.allow. b.r. Maxim Kozin

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[libvirt-users] Re : Libvirt Java Bindings
by Kartik Vaishnav 20 Sep '17

20 Sep '17

I am developing a Java Application using Libvirt. I found that the Java Bindings are not in active development. I need to obtain the IP Address of the Domain. In C, it may relate to virDomainInterfaceAddresses. Is there any way to implement it in Java.

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[libvirt-users] How can i limit CPU allowance to 25% of a single core
by Shashwat shagun 19 Sep '17

19 Sep '17

Hi, How do Hard limit a CPU allowance to 25% of a single core in KVM? Regards, Shashwat Shagun

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[libvirt-users] How to configure dnsmasq using libvirt?
by Don Zickus 18 Sep '17

18 Sep '17

Hi, I am working on a project, beaker, where they use anisble scripts to setup an environment with 4 virtual machines. One acts as a server to the other 3. We noticed after the network was setup, the domainname is not properly reported with using the 'hostname' command. We believe that dnsmasq was not correctly configured. Is there a recommended way to setup dnsmasq using libvirt and ansible? Thanks! Cheers, Don ps - please cc me as I am not subscribed to the list

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[libvirt-users] Question: How do i set data transfer quota
by Shashwat shagun 16 Sep '17

16 Sep '17

Hi, I want to limit my user's internet data transfer of his VPS. Is this possible? P.S I’m not talking about the internet speed. I’m talking about data usage limit Regards, Shashwat Shagun me(a)shashwat.tech

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[libvirt-users] Compile libvirt on OSX 10.12
by Homie Pawlowski 15 Sep '17

15 Sep '17

I'm having issues with compiling libvirt on OSX 10.12  ~/Development/github/libvirt/ [master] make /Library/Developer/CommandLineTools/usr/bin/make all-recursive Making all in . Making all in gnulib/lib /Library/Developer/CommandLineTools/usr/bin/make all-am make[3]: Nothing to be done for `all-am'. Making all in include/libvirt make[2]: Nothing to be done for `all'. Making all in src /Library/Developer/CommandLineTools/usr/bin/make all-am CC util/libvirt_util_la-virthread.lo util/virthread.c:272:17: error: 'syscall' is deprecated: first deprecated in macOS 10.12 - syscall(2) is unsupported; please switch to a supported interface. For SYS_kdebug_trace use kdebug_signpost(). [-Werror,-Wdeprecated-declarations] pid_t tid = syscall(SYS_gettid); ^ /usr/include/unistd.h:733:6: note: 'syscall' has been explicitly marked deprecated here int syscall(int, ...); ^ 1 error generated. make[3]: *** [util/libvirt_util_la-virthread.lo] Error 1 make[2]: *** [all] Error 2 make[1]: *** [all-recursive] Error 1 Anyone have any suggestion on how to do so? Thanks, -- HOMERO PAWLOWSKI CLOUD CONSULTANT Red Hat <https://www.redhat.com/> 140 Broadway 24th Floor New York, NY 10005 hpawlows(a)redhat.com <https://red.ht/sig>

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[libvirt-users] DHCP logging settings
by Shannon 13 Sep '17

13 Sep '17

I find that libvirt clogs up syslog with trivial DHCP notifications. I know how to configure alternate logging with dnsmasq directly via 'log-facility' and/or 'quiet-dhcp' options but the XML format used by libvirt appears to have no equivalent options. Is there a way to reduce syslog spam from libvirt without switching to a system-wide dnsmasq service?

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