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Questions tagged [kvm-virtualization]

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-intel.ko or kvm-amd.ko. KVM also requires a modified QEMU although work is underway to get the required changes upstream.

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KVM Host halts for several seconds. How can I monitor and find the cause using libvirtd/virsh?

I have a KVM Host with 4 vms running 24/7h. All VMs runs smoothly but at a given time, all 4 VMs stops to ping and after 10 minutes, it continues to run. I knew that they are not pinging because I ...
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16 views

OpenStack on Bare Metal best practices [on hold]

We have two bare metal physcial hosts with large capacity - 1TB RAM, 56 cpu and 1 TB HDD on each. We are starting to adopt OpenStack for private cloud setup and bit confused with all the samples, ...
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28 views

Enagble Supermicro Virtualization in Bios

my motherboard is a Supermicro x9dri-ln4f+, and I am using dual xeon e5 2690 CPUs. I have been trying to enable Virtualization in order to load VMs in qemu and virtualbox. The motherboard claims to ...
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24 views

Cloning LVM raw volume

I have to clone and manage some LVM RAW volumes that were created without making filesystem ext4. So I tried to mount this volume and linux didn't find any filesystem to mount. Inside this volumes I ...
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18 views

KVM machines crashing in proxmox

I'm have a domestic proxmox installation which was running fine for a month or two. Recently, I started to have issues with two of the Debian-based virtual machines: the one that I use as router and ...
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10 views

Slow performance with nested bridged interface

On my HP Proliant microserver gen 8 box I have Ubuntu 18.04 running as host OS. Initially I was planning to setup one production VM (vm-prod) with multiple services inside lxd containers (vm-prod-lxd-...
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26 views

KVM host with GNS3 LAB

This is for SDN LAB in the GNS3 with Asterisk. I have KVM physical host in Germany (everyone knows where I guess). I have a GNS3 lab running on Debian VM with some more VMs inside Vbox there. I'm ...
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7 views

Trim qcow2 disk

vps disk size does not updates on server when you delete files within vps. For example one vps had 1TB usage, I deleted 800GB in that vps but vps disk size is still 1TB on server.
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38 views

Unable to get KVM VM with with NAT interface and Public IP address at once

I have a dedicated Hetzner server running Centos7 minimal install and a /27 range of IP addresses. I wish to run several vms (with Centos7 on them) - web, database, etc. with only the ones that need ...
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27 views

KVM + netplan: disable DHCP default gateways on multi-NIC guest (cloud-init/netplan)

I'd want to setup a very "simple" configuration in a guest Ubuntu Server 18.04 LTS under KVM: a lan NIC interface, handled by DHCP, able to receive some static routing rules from DHCP and some local ...
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21 views

No internet connection on the VPSs created using Virtualizor (KVM)

I installed Virtualizor and KVM virtualization to be able to host multiple VPS servers on my dedicated server. My server provider said that my IP information are: Netmask: 255.255.255.255 Gateway: ...
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115 views

Changing MAC address of SR-IOV from VM in [spoofchk off,trusted on]

I have RHEL 7.4 + KVM with Intel i40e drivers with SRIOV enabled NIC[Intel X710] as host and Centos 7.5 as guest with i40evf driver. When i try to change MAC address of VF from the VM i get Operation ...
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24 views

(libvirt + oVirt) Migrating libvirt server to oVirt

I have two centOS 7 servers using the same network. One with libvirt, with some machines connected on it, and another one with oVIRT 4.2. I'd like to export the libvirt machines to the oVirst 4.2 ...
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21 views

Is that possible to get thin provisionning output using dd over ssh?

From : https://pve.proxmox.com/wiki/Migration_of_servers_to_Proxmox_VE dd if=/dev/sda | ssh root@proxmox dd of=/var/lib/vz/images/101/vm-101-disk-1.raw produce a raw image from original server and ...
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1answer
27 views

KVM guest cant fetch packages thus it's reachable from ssh

I am a bit lost regarding my kvm setup. I rented a root server at hetzner.de and now wanted to setup virtualization using libvirt & kvm. I created a bridge br0 which now holds the static server ...
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1answer
35 views

Block port 25 for a Kvm VM on server

I need to know how to block port 25 for a VM on a KVM server using ebtables or firewalld service . VM has interface name viifv3035 on the server and brctl shows this: # brctl show bridge name ...
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81 views

Why Windows 10 Virtual Machine show high CPU load on KVM hyprvisor

On KVM (Centos 7) Hypervisors Windows 10 Virtual Machines show High cpu usage. Around 30%. While other Linux, Windows 2k16, Windows 2k12 and Windows 7 Virtual machines just use from 1%to 7% CPU. By ...
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57 views

Centos 7, Qemu virtualization: Win10 guest VM or Win Server 2016 very slow I/O on small files

We use qemu virtualization with Linux hosts for many years now! It's a great tool! We use it both for Linux VM’s and Windows VM’s! But we have a strange unsolved performance issue with all the VM’s ...
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12 views

kvm (debian) save state and restore with host shutdown/boot

As I saw that a host shutdown and boot powers off and on an autosart guest, how can I configure it to save and resume its state after a host reboot process?
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106 views

Afer upgrading qemu, “unsupported machine type 'pc-i440fx-3.1”

I recently installed the latest version (3.1.0) of QEMU, and I have been having trouble getting virt-manager to work correctly, presumably because it isn't connected to the right dependencies. Some of ...
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1answer
45 views

Centos 7, Qemu virtualization: Win10 guest VM very slow after Windows Update

We use qemu virtualization for many years now! It's a great tool! We use it both for Linux VM’s and Windows VM’s! It's the first time we have any issues and I have no clue on where to find the ...
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1answer
31 views

Can't install additional VM with virt-install

Installing an additional VM with the virt-install command results in the following error: ERROR internal error: process exited while connecting to monitor: 2019-02-20T08:21:45.534416Z qemu-system-...
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14 views

KVM configuration for a Windows VM with Software MD Raid

Under Fedora Server I created a MD Raid 10. I also installed KVM.I will create a Windows VM and I need that this VM uses all the space in the MD Raid 10 formatted by Windows under NTFS with the best ...
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58 views

qemu process memory usage greater than guest memory usage

I have a physical machine with 24 GB RAM hosting a few VMs using libvirt-qemu. When creating VMs, I assign a lot of memory and no swap, so that the total of assigned memory can be greater than the ...
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2answers
34 views

Lost connection to main interface after brctl addif

I was setting up a server recently, and I was supposed to assign one of the public IP available for the server to a KVM guest. The server have the following setup: eno1 - main internet connection of ...
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1answer
58 views

Assign ethernet alias to KVM guest

I have a pool of IP addresses and a single ethernet cable. I have set aliases: auto enp2s0:0 iface enp2s0:0 inet static address x.x.x.x netmask x.x.x.x I want to dedicate some of the aliases to ...
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42 views

How do I tell KVM to connect to a pfSense guest text terminal?

Intro I'm new to KVM. I'm preparing an instance of pfSense in KVM; running this gets me close but is not completely working: virt-install \ --name pfsense \ --os-variant freebsd11.2 \ --...
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1answer
29 views

What do the IDs of PCI devices refer to and which ones are relevent for setting up passthrough?

In setting up a domain with virsh, I had always assumed that the "slot" of a PCI card referred to which slot on the motherboard it was in. However, that seems not two be the case, cards in two ...
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18 views

Use a different public subnet on KVM virtual machines

The host at my datacenter owns a single IP that is bound to eth0: (Example values) auto eth0 iface eth0 inet static address 192.88.99.111 netmask 255.255.255.0 gateway 192.88.99.1 In addition ...
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25 views

debian 8 host with samba server filesharing doesn't work on KVM/qemu VM's over bridge mode

i have the problem, that my debian 8 server where a kvm/qemu and a samba server is running has the problem, that i cant connect from any VM to the fileshare folder. i can see the host over the network ...
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1answer
31 views

Routing Port 443 traffic from RedHat 7 host to multiple guest KVMs

I have a RedHat 7 server and a couple of Ubuntu KVMs. The guest vms are connected using NAT because we do not have any public IP addresses to spare at this moment. Is it possible to use iptables to ...
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1answer
46 views

Can't access Apache installed on virtual machine (KVM) running Ubuntu 18.04

VPS: KVM (SolusVM), VM OS: Ubuntu 18.04, Network card: Virtio / Intel Pro 1000, I can ping VM IP 21X.XXX.XXX.XXX from my machine(at home). But cannot access Apache port 80 using 21X.XXX.XXX.XXX or ...
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1answer
70 views

should multiple threads be spun up by kvm/virtio-scsi on the host during IO workload

I am trying to pass-through a scsi lun to guest for best performance. What I am seeing on the host is that with iodepth=64 - 64 threads of qemu process are spun up for the VM. I believe this causes an ...
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49 views

How to fully emulate VM hardware?

How do I fully emulate, pass through, or spoof all the hardware for a virtual machine? I want to set up a few guest VMs in such a way that they do not have any special drivers or odd hardware info. ...
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20 views

Kvm guests cannot access internet

I have a kvm host and 4 kvm guests using default kvm nat networking. Using ip pool 192.168.100.0/24 for kvm guests. It seems that for some reason masquerading/or something else is not working properly ...
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36 views

Preventing LVM from accessing “low-level” devices of DRBD

Context: Active/passive DRBD setup. KVM VMs on LVM volumes. LVM using /dev/drbd0 for physical volume and volume group. During tests of the setup I have: Shut down Secondary node. Rebooted Primary ...
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2answers
407 views

Networking between KVM VM and docker container on same host

On a Debian-Stretch host (connected to physical LAN) I have a new docker installation (v18.09) with one database container (port mapped to the host) and I run KVM/libvirt with some Debian-Stretch VMs. ...
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1answer
64 views

Cannot boot Debian-9.6.0 in KVM: “640 x 480 Graphic mode”

I'm trying to get a disposable virtual machine on my private server. I've tried downloading a couple of Debian ISO files for 9.6.0, but I am unsuccessful in booting any of them. After trying kvm -m ...
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16 views

Macvtap not possible on Azure?

I know this is a bit of a niche topic. What I'm trying to do is to allow my KVM guest to have a dedicated NIC (eth1) to use for internet, while blocking internet via NSG (eth0) for the KVM host. In ...
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1answer
323 views

Apply Network Filter to Ovirt Guest without Rebooting

I am trying to change the clean-traffic IP address for a oVirt Guest VM. It works as long as I reboot the VM. ( Changed from within the Guest Virtual Machine Network Settings ) But for a production ...
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84 views

virt-install choice of graphics affects whether or not installed guest will boot after install

Please let me know if I am doing something incorrectly or if this is a bug. Host OS: Debian 9.6 Stretch amd64 Package: ii libvirt-daemon 3.0.0-4+deb9u3 ...
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52 views

Poor network performance on host machine using libvirtd / Qemu / KVM

We've got two Fedora 27 servers that we use to host several virtual servers using libvirtd / Qemu / KVM that are experiencing the same issue. When freshly booted, network performance is great, pings ...
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58 views

Static IPv4 in QEMU

I'm fairly new to QEMU and am attempting to provide static IP addresses to the network interfaces while bringing up the QEMU images via command line. The command is like below: qemu-system-x86_64 -...
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70 views

dmidecode uuid is different from Vmware esxi server

I have a query related to dmidecode uuid. In our product we are using dmidecode uuid try to match with ESXI vmware uuid of the same node. ESXI is providing the UUID as first three fields as big ...
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64 views

KVM Ubuntu Guest IPV6 DHCP does not work

I have a KVM server sitting on Debian server. Networking setup via macvtap/bridge device model rtl8139 I installed ubuntu server 18.10 w/o X. /etc/netplan/50-cloud-init.yaml network: version: 2 ...
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92 views

Assign Host LAN IP from Guest DHCP and get internet working

I am running sophos XG in a VM using kvm libvirt. I have a 4 port NIC (I350-t4) and 1 motherboard NIC. One of the 4 port NIC is PCI passthrough as the WAN interface (connected to modem). The other 3 ...
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2answers
42 views

libvirtd bridged networking, what iface is right to set IP?

Accodring to the documentation assigning of the IP addr it not mandatory for the BR interfaces. I have 2 netwok configuration set on libvirtd hadware node. Possibility one: 1. eth0 172.16.33.55/...
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1answer
75 views

How to delete a snapshot not seen with virsh but can be seen with qemu-img info?

[msingh@centos images]$ qemu-img info IE11-Win7-VMWare-disk1.qcow2 image: IE11-Win7-VMWare-disk1.qcow2 file format: qcow2 virtual size: 40G (42949672960 bytes) disk size: 82G cluster_size: 65536 ...
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1answer
168 views

Nested Virtualization KVM: entry failed, hardware error 0x7

I have a VM on a host and want to create another VM within the existing VM (nested). Host: opensuse Tumbleweed, kernel 4.19.7, 96 CPUS Intel-Xeon, 256GB RAM (nested virt enabled in kvm) L1 VM: ...
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1answer
73 views

how to set temporary backup location for vps in virtulizor?

i,m new to virtulizor and i have setup a ftp backup server. after a while i realized that you need to have enough empty space on your hard drives for virtulizor to be able to create a temporary backup ...