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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qemu-kfm LVM logical volume size inconsistency in df output

The Problem: andi@docker-host-01:~$ df -hT . Filesystem Type Size Used Avail Use% Mounted on /dev/vdb1 ext4 79G 41G 35G 55% / Adding 41G & 35G gives 76G and not 79G as shown ...
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Looking for 16 Port KVM Suggestions

I've used BlackBox 16 port ServSwitch KVM's in the past SW725A-R5 exactly and am looking for some reasonably priced replacements. Thanks!
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KVM Proxomox DR Site Setup [closed]

Hi I have created proxomox Cluster with HA, Client wants a DR site in different Geo-location, Any suggestion for implementing DR site? Thanks
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Proxmox/KVM Bridged networking breaking ssh connection

I'm running into an issue with Proxmox/KVM. I have setup a second bridge (vmbr1) that covers the IP space 172.16.1.0/24. I have assigned 172.16.1.1 to vmbr1. The vmbr1 is setup according to this. I ...
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Virsh command not working to install Centos 8 virtual-machine on Ubuntu 18.04 via qemu/kvm [closed]

I am trying to install centos 8 on ubuntu 18.04 as a virtual machine. I have a wireless connection. When I run the following command: chh2@chh2-cpu:~$ sudo virt-install --name=chris_centos --ram=...
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How can I make my libvirt/KVM guest see all IPv4/UDP multicast traffic?

I have an issue with IPv4/UDP multicast traffic not being fully visible from within a KVM guest. The guest has a dedicated NIC which is attached using MacVTap. Both the host OS and the OS in the ...
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KVM-QEMU bridged network not working - guest can only access host

I am trying to configure VMs to act like devices on my LAN, instead of hiding behind the host. This is the tutorial I followed: RHEL8 Network Bridged Interface My router/DHCP is at 10.10.1.254 Host ...
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CentOS 7, KVM, bridge, VLAN, bond and no guest traffic

I'm running into an issue where my KVM guests have no network traffic in- or outgoing. After a lot of hours debugging I'm pretty sure I'm missing something essential. What I have a server with 2 10 ...
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OVirt 4.2 Lost Connection To Nodes

I'm using OVirt version 4.2.3.8-1.el7 connected to 2 IBM PureFlex servers with 10 nodes (5+5) in total. OVirt suddenly lost connection to all the nodes but the VMs in these nodes are working without ...
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problems with bridge-networking libvirt on centos 8

I am running a centos 8 as virt-host with libvirt an kvm/qemu. Networking is set to bridge-mode with virbr0. Suddenly and over-night this stops working: The clients don't connect anymore, and if I try ...
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Virt-Manager shared folder Linux host Windows guest

I have a Manjaro Linux up-to-date host with a KVM Windows 10 guest with SPICE guest additions installed managed through Virt-Manager. I'd like to be able to access the host via a shared folder on the ...
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new admin wondering why htop and top show different numbers on scientific linux VM [duplicate]

I am trying to figure out if I am using htop correctly. A top on this VM reveals: top - 17:52:39 up 98 days, 23:05, 1 user, load average: 0.04, 0.01, 0.00 Tasks: 178 total, 1 running, 177 ...
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Kvm host not reachable even though guests are

I've got a debian server running multiple virtual machines (all debian-based as well) using KVM. Everything went well but some time ago, the host decided to not respond to ping echo requests ...
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KVM vps start error

vps un-able to start even with free ram on server. I have assigned 1Gb to vps : free -m total used free shared buff/cache available Mem: 64173 ...
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Attempting to set up Ubuntu VM with KVM on Ubuntu Host with external IP address unsuccesfully. Is there any obvious error in what I have done?

I've just built a new home server running Ubuntu 19.10 Server. I want to set up several VMs on this server (using KVM) to run various services on my network on their own IP address. I'm fairly ...
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Split network between VPN and kvm guest

I'm pretty sure this is stupid but has anyone tried the following ? I have 2 WiFi cards I want to use one to connect to a VPN using the wifi and the other interface to connect to the normal wifi but ...
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1answer
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KVM - Import CentOS 7 from XenServer

I imported a virtual machine (CentOS) from XenServer to KVM. This virtual machine originally had two disks (LVM). I added both disks to the imported machine in KVM. The disk containing the boot ...
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Best practice to backup a running KVM instance?

I have several KVM instances running on a development server. The hypervisor is running on CentOS. With the KVM instances running 24/7, what is the best practice (if one exists) for backing them up? ...
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how to to properly setup a linux server with kvm qemu for networking

I have two hosts (identical hardware) running two different linux-distributions. Both are running kvm-qemu, and I have copied the same qcow-file for a linux clients to both hosts. My network is using ...
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Attach KVM VM to vlan-filter capable bridge

I am trying to use new vlan-filter capable bridge on Virtualization Host running OEL 8.1. It does not support OpenVSwitch out of the box and I think vlan-aware bridge might work. Now I have (...
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(as uid:107, gid:107): Permission denied while installing KVM on external mounted USB

I am adding K=KVM from CentOS 7 VMM UI. $ sudo virt-install --network bridge:virbr3 --name guestusb \ --os-variant=centos7.0 --ram=1024 --vcpus=1 --disk \ path=/run/media/xyz/usbe/...
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How to enable KVM in RHEL running on a VM?

I need to run android emulators in a RHEL 7 virtual machine however it says that my machine should have KVM support. When I ran the lscpu command, the Virtualization type returns full. Does this mean ...
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The portgroup for Network adapter 1, could not be found

I am trying to run RHCSA Lab on MY VMWare Exsi 6.5. after copied my VM file and I have a warning on VMware Exsi "The portgroup for Network adapter 1, , could not be found.It has been assigned to ...
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I'm getting error during HA configuration for KVM on CentOS

After adding all nodes and resource agents in my cluster I'm getting this error please someone suggest me something. Please take a look in the image-
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Enable IPV6FORWARDING on KVM host on CentOS 7

I have here a KVM host on which is running CentOS 7. If my /etc/sysconfig/network looks like HOSTNAME=myname NETWORKING_IPV6=yes NETWORKING=yes IPv6 was enabled and I get a global IPv6 address: # ...
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HA configuration for KVM Guest on iSCSI shared storage [duplicate]

My requirement is to provide HA to a Zimbra Server. We want Zimbra files to be installed in a Netapp SAN which is providing around 5.7 TB as a SAN iSCI Drive. Since Netapp comes in with Dual ...
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Libvirt and macvtap issue on Arch Linux [closed]

I'm using Arch Linux (up to date) with QEMU-KVM, libvirt and virt-manager as a front. I have several VMs, but only one running at a time so far. The VM I'm trying to get to work is on Debian 10, but I ...
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HA configuration for KVM machines installed on shared iSCSI storage

My requirement is to provide HA to a Zimbra Server. We want Zimbra files to be installed in a Netapp SAN which is providing around 5.7 TB as a SAN iSCI Drive. Since Netapp comes in with Dual ...
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Migrating from libvirt + iptables to libvirt + nftables

I'm about to migrate a Debian Stretch host using qemu-kvm to Debian Buster. I've seen people complaining on the Internet about issues due to nftables becoming default in place of iptables and libvirt ...
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How to route all VM traffic through specific physical interface over a Linux bridge?

My objective is to have all KVM guest VMs send and receive traffic on em2 with addresses on the 192.168.2.0/24 subnet. I have a host Linux machine (CentOS 7) with several NICs, 2 of which are in use ...
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Qemu kvm virsh xml config for emulating PPC (PowerPC) guest VM on debian x86_64 host

When I try to save with virsh edit a qemu config with domain qemu (KVM not supported on x86_64 host when running PPC guest) and machine either g3beige or 40p (any other I can try?) with emulator qemu-...
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qemu/kvm detect cause of “pause” by script (no memory left on host)

The setup is a windows 10 vm and a Ubuntu 18.04 host running qemu/kvm supported by virsh/virtmanager. The vm image and its overlays have a own small partition, smaller then the virtual size of the vm-...
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gcp suspending active libvirt guests

I am facing the issue where GCP is suspending all the active libvirt guests frequently. Below are the logs from syslog. google-clock-skew: INFO Synced system time with hardware clock. systemd[1]: ...
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Dump network traffic of guest VM to host filesystem via serial console or vsock?

I have a VM which uses a VPN for connectivity and I need to dump the traffic of the VPN interface to some pcap file on the host. The VM is fairly stripped down but I can run tcpdump. I can't however ...
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Isn't swap file in KVM guests wasteful? Is there a better way?

So I am running a bunch of guests on a bunch of servers and currently my "standard" guest partitioning goes like this: 1GB for /boot 4 - 8 GB for swap the rest for / I allocate various amounts of ...
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Separate public ip addresses on host and guest with qemu-kvm

Is there some way to completely separate the networking between host and guest? I have a machine with one NIC, I can have multiple public IP addresses for that NIC. The machine runs a VM. One IP is ...
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Migrate from oVirt to oVirt

We are running two independent oVirt Clusters. Issue: Moving/Migrating/Evacuating Virtual Machines from the customer cluster, over to the management cluster, to separate out management systems from ...
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QEMU-KVM: VM will not start with virsh, only with qemu-system-x86_64

I have a vanilla Arch linux VM with disk in qcow2 format. I recently upgraded it and it stopped working. Every time I run $ virsh start Arch I get: Starting version 243.78-2-arch ERROR: device 'UUID=&...
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Way to open graphical console of KVM VM in fullscreen in Cockpit?

I've installed Cockpit, Cockpit-machines and Virt-viewer on my CentOS 8 and successfully connected to my KVM server in Firefox on Windows 10. But i can not find a way to open graphical console of my ...
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KVM inside Docker inside Hyper-V

The use case is a Cuckoo sandbox, which is a way to test malware in an isolated environment. Cuckoo is running in a Docker container in a Ubuntu VM, which is in turn managed by Hyper-V. Inside this ...
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Alternately running VMs with VMware on Windows and KVM in Linux

I plan to set up a virtualized test- and demo environment to show our clients how wonderful some applications can be deployed as containers. To be mobile I plan to use my laptop as the hardware ...
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QEMU/KVM/libvirt macvtap VEPA not working - ARP request not forward

Hi I've been struggling to get guest networking working when using a macvtap in VEPA mode between two VMs on a host. I've spent hours (days) googling with no joy. Does this network configuration ...
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(QEMU) Setup Windows 10 VM on a thinly-provisioned LVM device with discards (a.k.a. trim)

I'm trying to set up a Windows 10 VM using QEMU and I want to use a thinly-provisioned LVM volume and be able to "retrim" the drive in Windows. I created the device with: -drive index=0,media=disk,...
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Centos 7.7 KVM virtualization - two NICs, two separate bridges, cannot access NIC from outside

I searched for answer and tried different things but couldn't solve the problem, I really need help. There are LAN and DMZ networks: DMZ 192.168.0.0/24 LAN 192.168.1.0/24 I have Intel server with ...
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Is it possible to have a partial hyperthreading with a Linux System?

I have a server with 2*14 cores with Hyperthreading enabled. This means I have (2*14*2=28*2) 56 vCPUs. [root@supervision1 /]# dmidecode -t 4 | egrep 'Socket Designation|Count' Socket Designation: ...
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Is buddyinfo valid in virtual machines

Buddyinfo shows number of contiguous pages for each order available. Since virtual machine treats host's virtual memory as its physical memory does any kernel module allocating higher order memory ...
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KVM Mutliple Apache Guest VMs

I want to configure a CentOS 7/8 Host to have multiple KVM VMs running Apache that I can route to from the internet (i.e. Assign a DNS A/CNAME Record). What is the typical configuration for this? So, ...
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1answer
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CentOS 6 - Find KVM VM with HW addr

We are running KVM VM's (Linux & Windows) on our CentOS 6 & 7 hypervisors. Sometimes we are noticing a lot of packets going in or out. Now I want to see which IP address or network adapter ...
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KVM guests don't show correct source IP

I've got KVM hosted on CentOS 7. All of my networking configurations are done via NetworkManager. The problem I'm facing is that guests show KVM's IP, rather than my external IP, when connecting to ...
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Create iPXE UEFI bootable image for QEMU/Libvirt with custom next-server and filename

I can create a VM with libvirt/qemu to boot in UEFI mode. I know that it does iPXE by default, but I want to create/modify a iPXE image in order to override filename and next-server properties. How ...