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[libvirt-users] How to find memory utilization percent of kvm guest?
by suyog jadhav 28 Oct '15

28 Oct '15

I currently use following approach but its failing Find Max memory using following API vdgiRet = virDomainGetInfo(domPtr, infoPtr); memTotal = infoPtr->memory; Find current utilization using following API rVal = virDomainMemoryStats (domPtr, memStats, VIR_DOMAIN_MEMORY_STAT_NR, 0) ; for (i = 0; i < rVal; i++) { if (memStats[i].tag == 7) memUsed = memStats[i].val; } Which is the value of "VIR_DOMAIN_MEMORY_STAT_RSS = 7" Then I calculate util as (memUsed/memTotal) But the value of memUsed exceeds value of memTotal by small amount resulting in memUtil to be around 101 %. I understand that VIR_DOMAIN_MEMORY_STAT_RSS is Resident Set Size of the process running the domain. How do I Calculate the current memory utilization using alternate way?

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[libvirt-users] How can I set the advertised value of MTU for virbr0 interface?
by George Trakatelis 26 Oct '15

26 Oct '15

Hi all, I want to set the advertised value of MTU for virbr0 interface on a Fedora 21 host to 1454 to accommodate the installation of new VMs for testing purposes. The aforementioned host is an OpenStack VM actually, which explains the need for a lower than 1500 MTU. I noticed Pieter Hollants' patch to set dhcp-option=<number>,"<value>" for an interface, but it seems that it has not been implemented yet. Is there a possibility to have such an option? George

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[libvirt-users] net.ipv4.conf.all.forwarding
by lejeczek 23 Oct '15

23 Oct '15

hi everybody I'd like to ask how libvirtd influences net.ipv4.conf.all.forwarding, would you know? I've noticed that if I use host's bridge, therefor there is no <forward mode= > in my network then "net.ipv4.conf.all.forwarding" goes back to 0. Is this intended I wonder? Looks like libvirt decides it's user responsibility now. many thanks

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[libvirt-users] openvz driver
by Volker Janzen 22 Oct '15

22 Oct '15

Hi, I've a question regarding the openvz driver. I noticed that the virsh dumpxml output does not contain the memory settings. E.g.: <domain type='openvz'> <name>104</name> <uuid>ad2e9d0b-d242-482a-8640-5102e49d0f9b</uuid> <memory unit='KiB'>0</memory> <currentMemory unit='KiB'>0</currentMemory> <vcpu placement='static'>2</vcpu> <os> <type>exe</type> <init>/sbin/init</init> </os> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>destroy</on_reboot> <on_crash>destroy</on_crash> <devices> </devices> </domain> Can someone explain why this data is missing? As far as I know the driver reads the container configuration files, which contains the missing information. Regards Volker Viele Grüße Volker

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[libvirt-users] noVNC with qemu over ssh
by Digimer 22 Oct '15

22 Oct '15

Hi all, I have a little webserver interface for managing VMs running on a RHEL 6 based HA cluster hosting KVM/qemu VMs. I'd like to use noVNC to provide access to the hosted VMs, but I am not finding much information on how to do this (or rather, I can't find it in the large number of ovirt related posts). Has anyone done this or could someone point me in the right direction to docs on how to do this? Trying to even get direct access isn't getting me far (/usr/bin/novnc_server --vnc localhost:5900 -> click URL -> enter password, hangs on "Starting VNC handshake"). Thanks! PS - while testing, iptables and selinux are disabled... I'm trying to get a most basic setup working -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education?

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[libvirt-users] Libvirt from source problem
by Muhammad Asif 21 Oct '15

21 Oct '15

Hi Geeks, When I install libvirt from source, there is no libvirtd. how can i start or restart libvirt deamon. Moreover it give some permission error. What issue can be. Thanks

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[libvirt-users] Libvirt-LXC, container get stuck if it prints too much logs in the console
by Bertrand NOEL 21 Oct '15

21 Oct '15

Hi, I am creating containers using libvirt-lxc. My problem is that a process at bootup gets stuck at some point. My usecase is Puppet, but I can reproduce with a loop in bash. I noticed it is stuck until I connect to the console of the container (virsh -c lxc:/// console id). Then after disconnecting the console, waiting some times, the process gets stuck again. The more the process outputs to the console, the quicker it becomes stuck. To test that behavior, at bootup (in rc.local), in a loop I curl some server that I monitor. In my server logs I can see requests stops after some time. (I tweaked rc.local systemd service to output to console) Host and container are CentOS 7.1 Libvirt v1.2.8 Below is my libvirt.xml <domain type="lxc"> <uuid>9fbe3d43-e1b4-4244-8dab-b42995ab7403</uuid> <name>instance-000002f6</name> <memory>4194304</memory> <vcpu>2</vcpu> <os> <type>exe</type> <cmdline>console=tty0 console=ttyS0</cmdline> <init>/sbin/init</init> </os> <clock offset="utc"/> <devices> <filesystem type="mount"> <source dir="/root/rootfs"/> <target dir="/"/> </filesystem> <interface type="bridge"> <mac address="02:16:3E:00:F6:0E"/> <source bridge="virbr0"/> </interface> <console type="pty"/> </devices> </domain>

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[libvirt-users] "failed to connect to the hypervisor"
by Ken D'Ambrosio 21 Oct '15

21 Oct '15

Hi, all. Ubuntu host, attempting to get virsh working with VirtualBox... and failing. Here's what happens: root@foobox:~# virsh -c vbox:///session list error: failed to connect to the hypervisor error: internal error: unable to initialize VirtualBox driver API ------------------------------------------------------ Now, most of the docs I read about "failed to connect to the hypervisor" have other errors that happen *before* the "failed to connect" one, that are the root cause (e.g., unable to open socket, or bad cert, or whatever). But that's not the case, here. And what puzzles me more is that -- while I don't know what the output *should* look like -- to my eye, strace seems to say that we're getting information back: 1940 read(5, "Node 1 MemTotal: 33011680 kB\nNode 1 MemFree: 32565612 kB\nNode 1 MemUsed: 446068 kB\nNode 1 Active: 57948 kB\nNode 1 Inactive: 77036 kB\nNode 1 Active(anon): 27688 kB\nNode 1 Inactive(anon): 84 kB\nNode 1 Active(file): 30260 kB\nNode 1 Inactive(file): 76952 kB\nNode 1 Unevictable: 52 kB\nNode 1 [...] ------------------------------------------------------ In my googling, I see mention of per-VM XML files that... do something. But what they do, and how they're generated, doesn't seem clear. (E.g., XML mentioned here: http://libvirt.org/drvvbox.html -- it just sort of sits there, with no context.) Is that something I need? Thanks for any enlightenment you might be able to offer me, -Ken

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[libvirt-users] enable aes for guest
by Parvathi 20 Oct '15

20 Oct '15

Hi, How do I enable aes for guest VM? Host CPU supports aes (cat /proc/cpuinfo has aes in its flags and virsh capabilities also displays aes as a feature). When I add <features> <aes/> </features> to the xml file, I am unable to create the VM. It complains with the below error: virsh create /tmp/tmp.xml error: Failed to create domain from /tmp/tmp.xml error: internal error: unexpected feature aes Best!

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[libvirt-users] selective virsh host permissions
by Jamie Fargen 20 Oct '15

20 Oct '15

As a Systems Administrator, I would like to grant permissions to a certain VM using unix groups. In this example there is a hypervisor with VMs A,B,C,D and there is a group called fortadmins. The solution I am searching forI would just allow fortadmins to use libvirt/virsh commands on VM D. Does libvirt/virsh provide any way to easily accomplish this goal? Regards, Jamie Ian Fargen

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