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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109 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 ...
2
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0answers
173 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
745 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 ...
0
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0answers
565 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
105 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
43 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
100 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 ...
0
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1answer
237 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
183 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
388 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
81 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 ...
0
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1answer
238 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
193 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 ...
1
vote
1answer
738 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
489 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
171 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 ...
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2answers
39 views

Is there a way to set up a special user for kvm administration without adding to wheel group?

I'm trying to set up a user to manage kvm machines on a server, but I wanted to know if it would be possible to do without adding the user to the wheel group, as that effectively grants them ...
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2answers
155 views

How to assign IP automatically to a stateless Ubuntu virtual machine?

I plan on creating a reusable template image for deploying my application to multiple virtual machines that may be on different networks and different datacenters. I plan on having full control of ...
2
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2answers
550 views

Ubuntu 12.04 LTS KVM host with a OpenBSD 5.4 guest, `virsh shutdown` not working / freezing guest

I have Ubuntu 12.04 LTS KVM host with a OpenBSD 5.4 guest. I am having an issue with virsh shutdown not working / freezing guest. After calling shutdown, guest freezes and is unresponsive. Any ssh ...
1
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1answer
81 views

Mapping between KVM guest virtual discs and LVM logical volumes

The question is, how do I know which LVM partition corresponds to which virtual KVM disc? I am trying to install a KVM guest (Ubuntu server) on LVM logical volumes. I have used lvcreate to create ...
1
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1answer
158 views

kvm guest can not connect to outside of host, vice versa

I have a vmware vm running ubuntu 12.04 server(name=vmhost), with network bridged and full access to the internet. This vmhost is using the kvm hypervisor and is running a vm(centOS 6.4),network ...
2
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1answer
77 views

KVM Raw file size limitations

What are the technical and practical size limitations of raw disk files to be used with KVM? Can I create a 2 or 3TB raw disk file as a data drive for a KVM based windows virtual machine (acutally ...
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votes
1answer
20 views

KVM and external multiple external IPs [closed]

I want to have KVM with several VMs on it. I have several external IPs connected via one interface. As I understand I cannot use bridging if I want to have each VM with external IP. Am I wrong? Is ...
2
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2answers
140 views

Exactly how much is backported into RHEL [qemu-kvm specifically]? Only security patches, or perfomance improvments too?

https://access.redhat.com/site/security/updates/backporting/?sc_cid=3093 http://froginapan.blogspot.com/2012/07/redhats-backporting-activity.html As the above two links suggest, only security patches ...
1
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1answer
259 views

ovirt vdsm vlan - cant create virtual lan only wan port

I installed ovirt 3.3 on fedora 19 on my server. The Server has one ethernet connection, and it is a WAN so I don't have a LAN ip, or DHCP. I set a bridged interface (ovirtmgmt) on this interface ...
3
votes
1answer
129 views

Production-ready disk deduplication for KVM (Linux)? [closed]

Multiple Windows VMs, all of them with identical software installed (they're clones in fact) that I have to run for administrative+licensing reasons, give me a headache storage-wise. KVM on Linux runs ...
1
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2answers
62 views

kvm /sys/block/vdX/device/delete?

Why on kvm guest there is not file /sys/block/vdX/device/delete? maybe is like that because i can remove the drive from physical host? I know i can attach and detach virtual disk to kvm guest using ...
3
votes
2answers
149 views

How can I keep important VMs in memory without disabling swap?

VM Host -> Xenon E5-2440 w/ 48G mem... Everything runs CentOS6.5 (2.6.32-431) I have 4 guest VMs running each w/ 2G of memory. Their disk images are local files. The host machine is also running a ...
2
votes
1answer
54 views

What can be improved in my first qemu/kvm run?

Just started using kvm (qemu? I'm quite fuzzy with the terminology). To test if everything works fine, I created logical volume on my lvm, and then started virtual machine using: qemu-system-x86_64 ...
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0answers
430 views

KVM guest cannot write to 9p share owned by non-root

I am aiming to set up full write access to a 9p share for a KVM guest. Both host and guest have the same users/groups with the same IDs. Both host and guest should be able to write to the share using ...
1
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1answer
912 views

Libvirt: ERROR No domains available for virt type 'hvm', arch 'x86_64', domain type 'kvm'

Installed virt-man like this $ apt-get install virt-manager $ modprobe kvm $ modprobe vhost-net Launching libvirt guest $ virt-install --virt-type kvm \ --name centos-6.5 --ram 1024 \ ...
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1answer
49 views

kvm with paravirtualization support

I am preparing to verify KVM with paravirtualization support(mainly for networking). Does mentioning driver name as vhost is enough to make it run in paravirtualization mode ? I have all options ...
0
votes
1answer
130 views

Slow VM installation on KVM

I have a standard (not modified) KVM+libvirtd installed on clean Centos 6 machine with 8G of RAM and 8 cores CPU. When I am trying to install guest centos 6 using virt-manager it takes ages to finish ...
3
votes
3answers
753 views

Slow disk I/O in KVM with LVM and md raid5

I have been battling with a kvm setup under debian for two weeks now, specifically with guest I/O disk performance. The system: -Supermicro 1018d-73mtf (X10SL7-F motherboard) -16GB ECC/UB -Intel ...
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0answers
812 views

KVM LVM-based guest… kernel: Buffer I/O error on device. Failing drive?

Currently setting up a small KVM host to run a few VMs for a small business. The server has 2 drives in software md RAID 1, then I have it set as a PV in an LVM setup. Guests and hosts are all CentOS ...
2
votes
1answer
185 views

OpenStack EC2 Ubuntu cloud image — SSH host keys were changed after emegency reboot

Recently one of our servers was hanged due to IPMI BMC failure. It is CentOS 6.3 OpenStack compute host serving KVM vitual machines with qcow2 backend. There was running a VM based on EC2 Ubintu ...
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votes
1answer
39 views

live migration on KVM

I knew that the KVM can be run in ATOM server processor ( because ATOM server processor support intel-VTx ). But I'm wondering it is possible "live migration" in ATOM server. Who know about this ?
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1answer
259 views

Settings KVM on Atom processor

I will set up KVM on Atom-Server. But I'm wordering is it possible to running KVM on ATOM-processer ? ( in ATOM-server processor )
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1answer
1k views

KVM: port forwarding to guest VM

I'm using KVM on Debian wheezy. I want to connect to the guest using ssh with the command ssh 1.2.3.4 -p 10122. What I do is: root@host$ iptables -t nat -A PREROUTING -p TCP --dport 10122 -j DNAT ...
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2answers
323 views

KVM under CentOS, swap exhausted, physical memory available

I've had a test CentOS KVM host running for about a week now with 3 CentOS guests. There's 12GB physical RAM with about 7.5GB actually allocated to VMs. These VMs aren't even being used yet as the ...
0
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1answer
117 views

virt-top says guests are inactive

i was searching a program to show RAM and CPU usage of my KVM guests. I found virt-top which was working yesterday very good. Today i was starting it again and it dont want to work: virt-top 19:46:51 ...
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0answers
99 views

Linux not buffering block I/O when the device is not “in use” (i.e. mounted)

I am installing new server and I've found an interesting issue. The server is running Fedora 19 (3.11.7-200.fc19.x86_64 kernel) and is supposed to host a few KVM/Qemu virtual servers (mail server, ...
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votes
1answer
431 views

KVM vs Hyper-V. Which hypervisor is best for windows guests? [closed]

I am currently testing openstack for windows guests (XP and 7). I have deployed openstack "all in one" on system with following specs Processor corei5. (4 physical cores and 8 Threads with HT ...
1
vote
1answer
71 views

Prevent hijacking IPs in a bridged network (KVM/libvirt)

Is there a solution to prevent a VM user assign/use IP addresses he doesn't own but are routed over the same bridge like his own addresses? The current setup looks like this with libvirt and KVM: ...
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0answers
388 views

Ubuntu server 13.10: Installing and running Archipel from deb packages

I am setting up a server to host virtual machines based on Ubuntu Saucy. The decision was to use Archipel for remote administration. Installation of ejabber and Web Client UI went smoothly. For the ...
1
vote
1answer
108 views

virt-viewer slower than virt-manager when viewing

I've got a thin client server in which I have a few VM's for users under KVM which I manage through virt-manager. What I've noticed is if I start a VM guest on a thin client using the command ...
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0answers
83 views

Nested VM Guest Access from Host - KVM

I have nested VM setup. I have a host with a single network interface card with a public facing IP. I have bridged this interface so that eth0 does not have a IP and br0 is having the IP instead. I ...
0
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2answers
133 views

Network config for KVM on physical machine with single NIC and single public IP

I have a physical machine running CentOS 6.4 and I will rent a place to run it in a data center. I want to install KVM on that machine to run some virtual machines. The problem is my physical machine ...
0
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0answers
43 views

I got asigned 2 ip blocks static route blade server kvm

I just collocated a 4 node blade server, and the colo now gave me two blocks of ip's. pub.lic.net/29 and pub.lic.net/27 They deliver all the /27 packets using a static route to one of the /29 ...
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1answer
1k views

Booting Ubuntu as VM with KVM on Ubuntu 12.04

I am trying to boot my very first VM using KVM. I have Ubuntu 12.04 installed, i made sure the BIOS had the right virtualization flag enabled for intel processor by running kvm-ok. I have researched ...