KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-...

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Script error implementing VFIO GPU Pass-through in Ubuntu 15.10 with KVM

I am having the following error when I run the executable script "sudo /usr/vm1" : cat: /sys/bus/pci/devices//vendor: No such file or directory cat: /sys/bus/pci/devices//device: No such file or ...
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17 views

Gues mapping to the hypervisors network

I am quite new to KVM, and my hypervisor is a CENTOS 6 machine. It has 4 network ports em1-4. The guest machines are eithe CENTOS 6 or 7. On ports em1-3 I have set up a bond called bond0. I would ...
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17 views

KVM - Lost connection with virtual machines

I have to change de ip address of hypervisor KVM and his virtual machines, but when I restart de network services in physical machine, I lost the connection with the virtual machines. I’m using suse ...
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1answer
30 views

Possible DDoS (not sure). Cannot trace with netstat

I have a KVM node I'm running with only 7 VM instances. When GigE uplink port is enabled, server connection goes crazy hitting over 300MBps somehow. I cannot trace which IP is possibly being attacked, ...
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6 views

kvm “could not read from cdrom (code 3)” [closed]

The VM "ran" (didn't fail to start due to an error) but immediately stopped with boot failure (no boot device). When I finally found the answer to this I thought it was worth posting for others ...
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2 views

Could RSync be used to backup Parallels vm to KVM? [migrated]

So I am currently using Parallels on my macbook pro but I am wanting to also use them on my desktop, which uses KVM. Since I don't believe KVM can read the parallels file format, would it be possible ...
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38 views

libvirt IPv6 Guest can't connect outside of the Host

i am trying to get a address from my IPv6-Subnet working in a Virtual Machine(libvirt, qemu). IPv4 over nat works like a charm. The host is a Debian 8.5 with qemu 1.2.9 and a 4.6.3-1~bpo8+1 (2016-07-...
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15 views

Restrict internet access with firewall rules for a VM running on Linux [closed]

I have Red Hat 7 running on my workstation, and Windows 10, used for working with Windows programs, in a virtual machine running on KVM/QEMU. The workstation, fulfilling the role as hypervisor, and ...
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3answers
136 views

KVM-Host lost connection to Storage

I would really appreciate some advice on how to fix this. I have a Debian KVM-Host with 9 Debian VMS running on it. The virtual machines are running on my little Storage via iSCSI. Now, my switch ...
3
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1answer
33 views

KVM direct disk access vs raw files

I have to setup 14TB of raid storage space (which just shows up as /dev/sdb). My question is: Is there any impact on performance from a kvm guest if I create ext4 on this large drive directly, mount ...
1
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0answers
30 views

xen to kvm migration using virt-v2v

I am seeing error connecting when I try to connect for conversion of xen-vm to kvm. I am use virt-manager w/o problems. Errors seen: [root@localhost ~]# virt-v2v -v -x -ic "xen+ssh://10.61.0.47" "...
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2answers
51 views

Linux bonding (balance-tlb), KVM guests and L2 switches = unicast flooding?

I have a unicast flooding problem on my network, that started when I moved some software to virtualized guests. It seems very similar to what reported here: Switch flooding when bonding interfaces in ...
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34 views

Linux ext4 timeout in KVM guest

Both the host OS and the guest OS are Debian 8 amd64. The guest is a raw disk image stored at /srv/machines/web.img. The host has a backup script scheduled each night at 1:55am. Here is my backup ...
2
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1answer
32 views

Auto clean unused space on disks in VM

I run KVM based virtualization server (namely, Proxmox) where some Debian based machines are run in KVM VM's. Proxmox can create backups of VMs, it also compress the VM disks images. As we understand,...
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0answers
20 views

Run same virtual machine twice simultaneously from the same base snapshot

I would like to have a base snapshot and then launch several virtual machines from it simultaneously. These machines have a short lifetime and then shutdown, there is no need to save the changed to ...
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43 views

IRQ changes when trying to virtualize with PCI Passthrough KVM.

While trying to test PCI passthorugh in a KVM machine... I have an odd behavior. I made sure the PCI bridge and device are on an IRQ alone. The card is a Digium TDM400P. LSPCI: -[0000:00]-+-00.0 ...
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3answers
61 views

Multiseat Linux Remote Desktop with KVM and Spice

I have a server running Ubuntu 14.04LTS. On it I created a (KVM) VM with Ubuntu 16.04 Desktop. I setup Spice on this VM so that I can access it remotely. Everything is working fine, got TLS, USB ...
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64 views

How to assign ipv6 to my kvm guests route mode

Do you know how assign ipv6 global addresses to my KVM Guests?My ISP provider advertise an ipv6 prefix /64.I use libvirtd an here is configuration. When i restart virbr0 cant communicate with local ...
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1answer
28 views

KVM - Adding public IP over bridge

I am working on setting up a KVM environment and normally I just take it for granted that the networking has been set up. I am running into difficulty getting the public IPs accessible from the VMs. ...
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0answers
23 views

Same mac addresses discovered in VM for bridges on host machine

I have two bridges on host machine, named br0 and br1 (having different mac addresses). A VM is connected by bridged networking through br0. Now VM is able to ping br0, which is normal. But it is also ...
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1answer
54 views

The cpu L1/L2/L3 cache see in kvm guest is really matter?

[root@centos7 opt]# cat /etc/redhat-release CentOS Linux release 7.2.1511 (Core) [root@centos7 opt]# lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: ...
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1answer
49 views

Virtualized windows 7 under qemu/kvm hangs

I have set up a windows 7 virtual machine using Red Hat 7's standard qemu/kvm. When I start up the vm, windows boots to the point where it says "Starting Windows" and displays the stylized window. ...
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1answer
48 views

SCSI virtual disks not showing up on RHEL 7.X KVM guests

For whatever reason I can't get my virtual disks to show up on any of my RHEL 7.X guests (libvirt + KVM). The XML is configured just like my other guests so I know it isn't an issue on that end. It ...
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0answers
15 views

libvirt vhba storage pool configuration

I'm running a project where I will use libvirt NPIV/vhba functionality to pass Fc LUN's from a SAN to KVM virtual machines. I'm using CentOS7 as host. I will also mostly use CentOS7 as guests. I got ...
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28 views

OpenStack instances power off by itself

Already asked this over on ask.openstack.org but I figured it would get more views here too. I am running OpenStack Mitaka on a 5 node cluster, 1 controller/network node and 4 compute nodes. I am ...
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0answers
64 views

Is it possible to clone a snapshot of a KVM vm?

I only find an option to clone the last state, but not the state of a snapshot. Is there a solution? I'm using virsh and virt-manager to manage the vm's. The Hypervisor is Ubuntu Server 16.04. The vm'...
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1answer
45 views

VM performance difference after moving to different ProxMox instance

I've got two ProxMox servers and when I moved one of my VMs, it's running into performance issues. ProxMox 3.4 running on Intel Xeon E5606 (2 CPUs, 4 cores each, @2.13 GHz). ProxMox 4.1 running on ...
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0answers
49 views

qemu-kvm VM hangs at iowait with virtio drive

We are seeing instances of a VM hanging with the following symptoms: load average 800, processes stuck, CPU 100% in iowait reading files work, writing files hang the system RAM utilization is high, ...
0
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1answer
20 views

mount a kvm qcow2 file

so i have a kvm image that i'm trying to mount: [0c79dafb-abb7-4714-9a0a-4e16f0b305e7]# tree . ├── console.log ├── disk ├── disk.info └── libvirt.xml [0c79dafb-abb7-4714-9a0a-4e16f0b305e7]# qemu-img ...
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0answers
32 views

KVM/libvirt: NAT forwarding virtual bridge to host bridge

I currently have a VM setup where only a few 'special' VMs are allowed to have outward facing IP addresses and the rest aren't. All of them are configured with two interfaces attached to a virtual ...
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1answer
27 views

virsh command that displays the cpu and memory consumption?

I want to know if there is a command virsh to display the cpu and memory consumption of each machine virtual. I created the virtual machine using KVM in ubuntu system.
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60 views

Assign 2 IP addresses to one virtual machine

I would like to assign 2 IP addresses to one virtual machine but cannot make it working. I have IP MAC 151.180.39.138 02:aa:cc:73:b1:39 78.132.120.30 02:cc:aa:79:fb:e7 /etc/...
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0answers
42 views

Need disk UUIDs in KVM guests

I'm porting a virtual server cluster solution from ESX to KVM (libvirt) and am running into a bit of trouble. In order for our propietary volume manager to label and slice the virtual disks, we had to ...
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0answers
17 views

QEMU image format

I have an image with .qemu format. I looked here to see QEMU supported formats but there is no .qemu. Is.qemu equal to raw? Thanks
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55 views

kvm virtualized Windows get low disk performances

Disclaimer This is indeed a continuation of this thread. I've opened a new question as the target has slowly shifted, therefore I think was good to open a new post. I will merge back if required. ...
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1answer
90 views

Provision a virtual server within CentOS 7? [closed]

This may be a really silly question, but I currently have a dedicated server and I have an incredible amount of redundant hardware. I'd like to be able to provision virtual servers running various ...
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0answers
53 views

virsh, how to get full screen resolution via VNC

I've got a few KVM VMs running on my home server, some of them running X. I use virsh to manage them, and tunnel 5900x ports via SSH to access them via VNC. I can't get the resolution to go higher ...
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63 views

kvm virtio disk performance scales badly with iozone workload

I'm conducting a number of tests in order understand why some of our workloads generate a really poor "user experience" with db related activities. We have a dl160g9 server with a B140i controller (4 ...
1
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1answer
47 views

KVM based VPS crashes every 3-7 days. Is it an issue on VPS side or node's?

I'm wondering could it be so that a VPS is a root cause of crashes which occurs every 3-7 days at night 03:00 - 04:00 time (kernel bug, or something else), or is it a node on which the virtual server ...
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1answer
71 views

libvirt: set hostname using dhcp in virtual network

I've configured a host-only (aka private) network for a group of VMs on a CentOS 7 host. I've created static leases in the DHCP section for the virtual network. The IP address is getting set ...
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1answer
65 views

boot issues after converting running linux to vm manually

I did a file copy of a running debian8 installation to a image. Following is the proceedure. create a vdisk image - raw / vdi. mount it locally. do a file wise copy of a running linux distro: ...
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1answer
76 views

CentOS 7 Virsh - Allow Non Sudo Users to Interface with QEMU / KVM / Virtual Machines

Is there a way to allow non sudo users access to KVM QEMU virtual machines in CentOS 7? I want to allow a non-root user to manage KVM guest virtual machines without having sudo access. Mainly, I'd ...
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0answers
16 views

Debian & KVM: limit FC at restoring

my system: 3 Proxmox hosts (debian 8.3) connected via FC (4G) to an open-e storage. Backup is a NFS storage from FreeNAS. All VMs disk lay on that storage, everything is fine. I can create VMs, ...
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1answer
19 views

qemu-img: by accident decreased disk size

I decreased my KVM disk image by accident from 100G to 50G using: sudo qemu-img resize disk.raw 50G I wanted to increase the disk from 100G to 250G. Now the VM is not booting :( And get this ...
2
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1answer
28 views

libvirt kvm qemu virtual machine - hard code domain-id?

Is there a way to hard code the domain-id of a virtual machine kvm guest? I tried adding an id attribute to the XML configuration via virsh edit name And I also tried to edit the XML directly ...
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0answers
59 views

Qemu kvm necessary kernel and qemu version on jessie host and guests with Skylake

I am running a dedicated server with Debian jessie and the current backported linux-image-amd64/linux-headers-amd64 (currently 4.5), because the server has a Skylake CPU. On the dedicated root, I'm ...
6
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1answer
3k views

Windows 7 Setup hangs at “Starting Windows” using Proxmox 4.2

I am trying to install Windows 7 on Proxmox Virtual Environment version 4.2-4/2660193c, running on Debian Jessie. I have followed the instructions on this site. I uploaded a known-good Win7 ISO (that ...
0
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1answer
85 views

Virtual NICs and Host only adapter in KVM

How can i create virtual network adapter like a physical eth0 in KVM? As I lack physical NICs. Also I need a Host-only adapter just like in VMware to connect two VMs in KVM. What is possible solution ...
0
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1answer
47 views

virsh console hangs whenever I connect to Virtual Machine

Whenever I try to connect to VM using virsh console <vm name> my screen hangs and displays: Connected to domain <vm name> Escape character is ^] I have found many solutions on the ...
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37 views

Gentoo virt-manager IO throttling

I have a problem with virt-manager (or qemu/libvirt) installed on gentoo. Here is My virt-manager installed on Debian Jessie: There I have IO throttling but not on my Gentoo: I tried to search ...