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, ...

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Retreiving the real hostname of VMs under KVM using Virsh

In KVM Support, virsh list --all lists all the domain name created and not the real host name of the VM. i.e it will list only the display name which will be specified during the creation of VMs. ...
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204 views

SSD+MDRAID+LVM+KVM results in lower performance than expected

We use kvm for virtualization, the disk images are stored as logical volumes. The logical volumes are stored on a bunch of software-RAID1 (mdadm) arrays composed of Intel DCS3500 SSDs (each array is a ...
2
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2answers
184 views

How to get SRIOV network pool with multiple PFs

For an Ubuntu 12.04 server and KVM/libvirt 1.0.0 with an Intel 82599 network chip: following these docs: ...
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163 views

Access KVM guest via hostname on private virtual network

KVM on CentOS 6.5. Setup one bridge connected to internet. And one virtual network on subnet 192.168.100.0/24 DHCP start: 192.168.100.128 DHCP end: 192.168.100.254 How to ...
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65 views

How to automatically start virtual Networks using virsh?

Following this answers, configuring domains to autostart using virsh is easy; set aside they fail with following error message: error: Failed to start domain [name] error: internal error Network ...
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95 views

KVM, Ubuntu 12.04, Cloudmin and port security

In my test environment I get everything working perfectly the way I want it. Running Cloudmin KVM instances over a bridged adapter. Then when it comes time to install at the data center I hit a brick ...
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1answer
308 views

Tap interface within a virtual machine has NO-CARRIER

I am trying to hook up a virtual machine to a host using openvpn. When i create a tap interface within the virtual machine using: /usr/sbin/openvpn --mktun --dev tap1 The state of the tap interface ...
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1answer
222 views

Migrate multiple LVM volumes for KVM guest to image

I want to move some KVM guests to VMWARE and therefore have to create VMDK images of the disks. The virtual disks for the guests are spread around multiple LVM volumes. There are a couple of pointers ...
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51 views

Forward connecting IP address to KVM guests

I'm running kvm with iptables configured to use DNAT and masquerading. However the guest machines are logging the host bridge ip not the connecting client IP address. Is there a way to configure ...
2
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1answer
63 views

Is the ethx mac address of a VM the same as the mac address of the corresponding tap interface?

I have a single node openstack install on an ubuntu machine. For some reason that I cannot figure out, the linuxbridge is dropping packets from this VM. My iptables seem to be fine (atleast as far as ...
2
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1answer
413 views

Ubuntu/KVM Bridge Interface IP Assignment

I have a Ubuntu 12.04 LTS machine running KVM/libvirt. It has two physical ethernet interfaces. I have dedicated eth0 as the primary interface and configured bridging on eth1 for my VMs. The KVM host ...
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2answers
552 views

How to setup multiple VPS or virtual machines on a VPS hosting account? [closed]

Let's say you have a Linux VPS hosting account and you wanted to add several VPS's inside that VPS or virtual machines, how can you do this? A scenario could be that I wanted to install an IIS server ...
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1answer
297 views

KVM virtual machine boot messages

Just wondering if anyone knows of a way to stop the following boot messages with a centos 6.5 vm created with qemu-kvm When I start the vm there is a slight delay as the vm posts the following boot ...
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897 views

Very poor disk performance on KVM node - mdadm raid10

For a long period of time, i'm experiencing performance issues on CentOS servers that are used for KVM virtualization. I'm running software RAID-10 with 4 disks (Seagate ST2000DM001, 2TB, 7200rpm ...
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1answer
2k views

Migrate KVM .img to VirtualBox .vdi

I am trying to migrate a VM from KVM to Virtualbox (win7 64bit). I was able to convert the disk image using these commands: VBoxManage convertfromraw -format VDI XX.img XX.vdi qemu-img convert -f ...
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281 views

Munin Data gathering - Some nodes fail gathering data

Hy Everybody I've run into a strange Problem with munin for which i didnt find any solution... maybe somebody here will be able to help. Im running the munin-master on a debian 7. Here's the config ...
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1answer
116 views

Does 'lvremove' destroy data?

I assign a LV for each vm guest. When deleting a vm, I remove the corresponding lv running 'lvremove'. But is it necessary to destroy the data before running 'lvremove'? Does lvremove do the work of ...
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1answer
54 views

cpu cache size in KVM vm differs from real cpu cache size

Although I'm running KVM/qemu with the <cpu mode='host-passthrough'/> option, the guest machine has only 4096 KB of cpu cache, while the host cpu has 8192 KB (i just verified the output of ...
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1answer
80 views

Detailed explanation of how virtual machine snapshots work

I would like to fully understand how virtual machine snapshots work. Although I have researched this subject I cannot seem to find a "high-level" overview of how snapshots work practically. My ...
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2answers
121 views

KVM Disk Formats: Portability

I have recently begun experimenting with the KVM virtualization infrastructure. After deployment, I used virt-manager running on a management computer to build my first guest. I notice that, by ...
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1answer
312 views

Why is there a socket interface on the host and a character device interface on the guest for virtio-serial?

I am trying to establish a communication channel between the host and one of its guest virtual machine using kvm as a hypervisor. For this, I am using virtio-serial. To create the virtual machine, I ...
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1answer
1k views

KVM-Host OS recommendation [closed]

I am about to migrate a server installation (one OS) to a newer hardware and wish to enable/use KVM. So the hardware is fixed (https://www.hetzner.de/hosting/produkte_rootserver/ex40) , now I got the ...
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1answer
207 views

assign public IPs to vm guests

I have a set of public IPs for virtual machines. Each unique public IP is to be assigned to a unique guest. With bridged networking I share eth0 with KVM machines. The ifcfg-eth0 file has ...
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2answers
1k views

How to assign multiple public IP address for 3 KVM guest using a single NIC [closed]

i've a CentOS 6.5 KVM Host with 3 KVM-Guest CentOS 6.5. Now I want to assign a public IP for the host and one public IP for each guest using a single network interface. My IPs (assigned by network ...
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0answers
73 views

Bridging Adapter in Ubuntu 12.04 LTS for KVM

Fresh install of Ubuntu 12.04 LTS with libvert/KVM installed. I have 2 virtual machines that I need need to be on the same LAN as the host. The host has two physical interfaces eth0 and eth1. eth1 is ...
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1answer
176 views

QEMU's QMP to listen on same socket?

Is it possible to have multiple qemu processes (machines) to listen on the same socket? I.e. you have this identical part when starting qemu processes: -qmp unix:./qmp-sock,server,nowait --monitor ...
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1answer
1k views

windows server 2012 resolution woes with vga

I have two windows vms, windows server 2012 and windows server 2008. Both use kvm and libvirt. I recently decided I wanted to increase my screen resolution options, which required changing from the ...
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0answers
108 views

VDA Disk Fail / Virtual machine corrupt

I am hoping I can get some help here. I have a server that is hosted with a very large server hosting company and today the server became unavailable. On contacting the company they said that the ...
2
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2answers
176 views

Linux KVM disk cache balancing between host and guest

Let's say you have a base server running several KVM guests. Now with regards to disk I/O caching, it would seem that the base server would cache the I/O in its memory, but wouldn't the guest also ...
4
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1answer
268 views

Private network between two KVM VMs

I'm trying to connect two KVM hosts together with a transparent ethernet link. I'm using Proxmox VE as the host and have configured 2 KVM VEs with ethernet interfaces and joined them to a single ...
1
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1answer
402 views

Why can't I shutdown running kvm instance?

I have running kvm instance: =# virsh list --all Id Name State ---------------------------------------------------- 2 debian-test running When ...
2
votes
1answer
435 views

virt-install ignoring vnc port/listen?

I'm trying to create kvm machine on remote host. The host is running debian testing. Did use this command: virt-install --name debian-test \ --os-type=linux \ --os-variant=debianwheezy \ ...
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2answers
173 views

KVM Network configuration + VLAN trunck

I am trying to set up a KVM Based solution, I am having trouble configuring the NICs for the VMs from a bridge based on a VLAN interface. My config below : ETH0 : KVM Host Management : ...
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1answer
1k views

How to replace QEMU binary with newer version for libvirt live snapshots

This is my first post, so please be gentle. :) My CentOS 6.5 box has a QEMU binary that does not support live external snapshots. This is the command I attempt on the virsh CLI, and its output: ...
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1answer
135 views

Using all host resources for a single Windows VM (KVM) - how to improve performance

We're using KVM/qemu on Ubuntu 12.04 to spawn a Windows 2008 R2 VM that uses a lot of host resources (all CPU cores, 4GB RAM). It seems that during a Windows boot that Windows allocates all its ...
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0answers
344 views

Please help recovering lost volume group

After a reboot, the volume group on my server completely disappeared. [root@dal01 log]# vgdisplay No volume groups found [root@dal01 /]# lvdisplay No volume groups found [root@dal01 ~]# pvdisplay ...
2
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1answer
1k views

libvirt and network filtering with nat - iptables overrides

At first, I want to say: I know, it was done initially wrong and I want to avoid doing everything again from the scratch because of general downtime. I am running libvirt/KVM on RHEL. I've got VM ...
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0answers
901 views

the file-system of kvm virtual machine went to read-only after live migration

I setup my kvm virtualization environment with GlusterFS, the topology as follows: KVM1 ---------- KVM2 --------------KVM3 |----------------------|-------------------------| ...
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1answer
127 views

Networking issues KVM

I have a server that is running Debian 7.2. I recently set up KVM on it, and created two VMs. Both VMs are unable to connect to the Internet. I was following a tutorial, and I'm certain I followed the ...
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2answers
50 views

My KVM machine can't get the network

I'm setting up a virtualization server for my company based on Fedora 19 and KVM. Our goal is to being able to convert and run a bunch of VirtualBox VMs. So I setup my F19 server, and created a br0 ...
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1answer
129 views

libvirt Storage Backend

libvirt supports several storage backends[1] for hosting the image on a different server. We have 6 servers running about 40 VMs. Up to now we use local storage, but to minimize the downtime we want ...
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1answer
309 views

KVM Win 7 Pro + RH virtio net driver

Host: Debian 7.2 x64. Guest Win 7 Pro 32-bit. Virtio disk drivers work flawlessly, but there's a problem with virtio net (netkvm something) drivers. Virtio drivers come from virtio-win-0.1-74.iso. ...
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1answer
346 views

MAXWAIT parameter for bridge on Debian Linux boot

I can't seem to find MAXWAIT setting (bridge initialization time) anywhere in /etc on Debian 7.2 x64. Sometimes default 20s is too short for some reason and I'd like to set it longer.
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1answer
527 views

Debian KVM and location for vm images different than /var/lib/libvirt/images

I have defined storage pool for VMs on ZFS: virsh # pool-dumpxml zfs <pool type='dir'> <name>zfs</name> <uuid>b2fba550-467f-8133-dee8-44ada7d0a807</uuid> ...
0
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1answer
103 views

Correct way to copy vm disk

I have a VM’s disk to copy from one host to another for live migration. I can think of two ways to copy the VM’s disk. Do a snapshot of the Logical Volume in the original host, create a Logical ...
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1answer
322 views

OpenNebula can't start vm after reboot

I installed a fresh install of Debian-7-opennebula-4.4.0-1.tar.gz on a fresh Debian and got a VM to start via sunstone. The output of libvirt was: 2013-12-26 12:48:12.919+0000: starting up LC_ALL=C ...
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1answer
301 views

Knowing when a qemu vm shutdown (initiated via telnet using QMP) is finished

When I start a qemu (Windows Server 2003) virtual machine with -qmp tcp:127.0.0.1:4444,server,nowait I can make it shutdown with the following script #!/bin/bash telnet 127.0.0.1 4444 <<JSON ...
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1answer
1k views

Assign ipv6 address to KVM guests on bridge mode

System: CentOS 6.5 Network: Bridge on br0 IPv6: ISP Native /64 block. IPv4: ISP address (not internal LAN) Purpose: To assign IPv6 only to guests (manually), I don't want ipv4 address to be ...
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1answer
749 views

how to connect multiple kvm/qemu VM guests in to a subnet [closed]

I want to setup a simple subnetwork of KVM/QEMU guest VMs living on a single host (Fedora 19) for testing purposes. The subnet would contain 3 servers: 1 Debian 6.x eth0 ip: 10.0.0.7 eth1 ...
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1answer
229 views

Access web server on VM from a machine in a different subnet

I cannot access to a web application running on a virtual machine hosted by KVM from a machine in a different subnet. So, I would like to access from the machine 192.168.1.2 (top right in green ...