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 Virtualization Server - One physical disk(SSD) every virtual machine

In terms of performance, is it better to have one "big" SSD disk for several (lets say 5) virtualized guests, or a single smaller SSD disk for every virtual machine? any general draw back ...
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QEMU / KVM - Dedicated 802.1q VLAN for each VM - Communication only via router

I have a Linux firewall router (dedicated machine) with multiple ethN interfaces (my "big firewall"). All forwarded traffic is filtered by a set of iptables rules (default policy DROP). ...
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Raw LVM disk write is four times faster on host than inside KVM guest?

I've got a Debian 10.6 Host, with a Debian 10.6 guest. KVM/Qemu/libvirt. The host has a software RAID 10 array with 6 mechanical disks. LVM is on top of the RAID array. One LV is passed into the guest ...
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Linux bridge does not forward packets to TAP interface

I have the following scenario where I run a Docker container which has configured inside of it a Linux bridge br0 and attached to it I have the main interface eth0 of the container and a TAP interface ...
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Can I customize all my operating systems that I will install on kvm/qemu with Virt-customize?

For my private cloud provider, I want to create a virtual machine from the operating system iso I want using kvm/qemu (since I was looking for an alternative to cloud-init, I chose to customize it ...
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How to enable nested virtualization in order to use VirtualBox inside of a KVM virtual machine?

We have a KVM hypervisor (L0, AMD, Kernel: Linux level0kvmhypervisor 4.19.0-12-amd64 #1 SMP Debian 4.19.152-1 (2020-10-18) x86_64 GNU/Linux), which runs a virtual machine that I would like to use as a ...
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Can't see docker ports from external machines when using a veth interface with an OPNSense KVM

Quick summary of the setup: Ubuntu Server 20.04 with 4 network ports OPNsense router running in libvirt KVM One port is WAN, three ports are LAN (bridged) Router works great Server (same one running ...
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CPU frequency in KVM vps

Is it possible to display CPU max and min frequency in a KVM vps using Libvirt on server ? It only shows CPU mhz in vps and not max and min mhz as seen on server in lscpu command output.
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Resizing VM's size having only boot partition

I've to increase my KVM guest's partition, I followed steps as explained in the accepted answer here. For step 3, there's a link mentioned in the accepted answer comment section (tried to paste it ...
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1answer
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KVM quests “stuttering”/“freezing” intermittently on Debian 10

I'm using KVM on Debian 10 as host and for now two guests that are Debian 10 as well. The guests are "stuttering" frequently, what I mean by that is that like at least several times an hour ...
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1answer
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Ubuntu KVM - Bridge - Isolate Host from NIC

I have a Ubuntu Server with 4 physical NICs. 2 of them, i want to "hide" from the Host, so the host itself may not access traffic on those 2 nics, just the VM where i pass them into (...
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KVM DNS forwarding not working / reply: REFUSED

I've set up a couple of VMs for development purposes for a project. The setup includes a local CA for the past, current and future project VMs. On the guest if can do dig staging.testing.lan and get ...
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Does add more memory RAM decrease I/O wait?

My server is Ubuntu KVM and has 2 cores, 4GB RAM, and I use HDD, at moment I can't swap HDD to SSD. I found this answear (https://unix.serverfault.tech/a/463819/351968) saying that adding more memory ...
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DisplayPort KVM Switch issues

I have two computers connected via an DispayPort KVM-Switch to two monitors. When i boot one of the computers while it is active on the monitors then i'm getting the correct dual monitor screen on ...
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KVM with 1 vCPU has CPU load above 1

I have a KVM running with 1 vCPU on a machine with 4 cores. lscpu in the KVM gives me 1 CPU with 1 core : Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte ...

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