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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1answer
204 views

New KVM guests cannot access outside LAN

I have a KVM host (at 192.168.0.10) that currently has one working KVM guest (at 192.168.0.12). On attempting to install a new KVM guest today, I reached a problem where the network on the new guest ...
0
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0answers
35 views

Trying to communicate between virtual servers on the same host through ipv6

I am running KVM on a host with 2 virtual servers. Each virtual server has a own bridge interface on the host VPS1 has br1 VPS2 has br2 Each virtual server has a own ipv4 and a ipv6. The virtual ...
0
votes
4answers
99 views

Can 3.2 kernel KVM VMs run in a 2.6 kernel host

So I got a Redhat6.2 and going to install it on a new IBM x3650 m4 server. However I want use Debian because I'm more familier with it. Since x3650 doesn't support Debian(I've tried but no luck), I ...
0
votes
1answer
43 views

qEmu doesn't save changes to virtual harddisk

I've installed qemu and AQEMU on my Ubuntu 13.04 from default repository. I created a virtual machine by using the wizard and set the harddisk to 10 GiB. I added a Debian 7.1 .iso file to the device ...
1
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1answer
77 views

How to I set up Linux KVM to automatically assign VNC ports to guests

I am setting up some guests on a Scientific Linux 6 box running KVM. I do the virsh vncdisplay machinename command and it does not show me an assigned VNC port. How do I assign VNC ports to ...
0
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0answers
83 views

KVM directly connect to guests without passing router

I have a KVM host running 5 virtual servers. Each virtual server is using a separate bridge interface, like br0, br1, br3... Each virtual server has a own public IP. Now, I would like to be able to ...
0
votes
1answer
103 views

NAT one network to another using iptables

Trying to NAT ips in different network using iptables. KVM host with ip 10.10.11.36 on bridge br0. Two vms are running with ip 192.168.11.60 and 192.168.11.57 sharing bridge br0. Want to NAT all ...
0
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1answer
68 views

Packets not going through Linux Gateway

Host: centos6 with ip 10.10.11.36 and gateway 10.10.11.33 Guest two vms with ip 10.10.11.60 and 10.10.11.57 and gateway of that of host ie 10.10.11.36 On host packet forwarding is enabled. from ...
0
votes
2answers
572 views

Getting started with KVM coming from Vmware

In order to test new ideas and reduce cost I would like to test KVM. I think Vmware has these 3 things which are valuable: - HA which restart VMs (Virtual Machines) in other hosts when a Hardware ...
0
votes
2answers
274 views

Why VM cannot get the public IP I have from provider?

I have a KVM-Host (on Debian) with root@kvm-host:/# cat /etc/network/interfaces auto eth0 iface eth0 inet manual auto vmbr0 iface vmbr0 inet static address 176.x.y.133 netmask 255.255.255.224 ...
2
votes
1answer
319 views

Why are eth0 and vmbr0 (bridge) having the same MAC addresses?

I configured my Debian (with KVM on board) as following: /etc/network/interfaces: auto lo iface lo inet loopback auto eth0 iface eth0 inet manual auto vmbr0 iface vmbr0 inet static address ...
0
votes
1answer
254 views

How to configure a network on KVM using only public IPs?

I have a KVM server and two VMs. I have one main IP and two additional "single" IPs (not a subnet). I don't want have a local network with private addresses on my KVM, but I want to assign my public ...
0
votes
1answer
95 views

What is th tap100i0 device on my debian with KVM?

I want configure a network for virtual machines on KVM. I created a bridge. But I found a new tap100i0 devise was created. Should I take it into account to get the virtual network running?
0
votes
1answer
155 views

What are the differences in the configuration of the network on Proxmox (KVM)?

I have a dedicated server, one main public IP from /27 and two single public IPs also from the same /27 (I think the provider manages single IPs using the VLAN tags). I want to have a KVM running on ...
3
votes
1answer
173 views

KVM: Run a script when a guest is shutdown from within?

I am running KVM as virtualization engine. Is there a way to make QEMU/libvirt run a script on the host when a guest is shutdown from within (shutdown -h now)? I want to be able to run some custom ...
0
votes
1answer
43 views

KVM: RHE 4 guest hang for multi task usage

I want to host an old RedHat Enterprise Linux 4 with a 2.6.9 kernel on a Debian 7 core2duo host. The RHEL4 was originally deployed on a physical server and used only for development on old software, ...
2
votes
1answer
323 views

KVM guest won't boot from hard disk image, but will from CD-ROM image

I'm using KVM to host a Debian unstable guest on a Debian unstable host. Emphasis on 'unstable' :-) Until recently (and until a recent round of Debian package updates on both host and guest) this was ...
1
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0answers
177 views

nwfilter: Generated firewall rules don't make any sense

I'm trying to configure nwfilter for KVM, but so far I haven't managed to figure out a working configuration. Network setup: The dom0 (Debian 7.1, kernel 3.2.46-1, libvirt 0.9.12) is connected via ...
1
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0answers
171 views

Windows Server 2012 on KVM behaving as if Windows Key is getting hit repeatedly

I've got a brand new install of Windows Server 2012 Essentials running on KVM on OpenSuse 12.2. When I VNC in to the VM (using the VNC server provided by KVM, not one installed on the guest OS), it ...
0
votes
1answer
203 views

Signaling KVM/QEMU VM to quiesce, preparing for live backup

Assume a KVM/QEMU VM, which uses qcow/qcow2 as the image format for virtual disks. Backup is (to be) done on the VM host. As far as my current understanding goes is that while we can create backups ...
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votes
2answers
97 views

VM running perfectly when its disk image is deleted? [closed]

Does anyone has such experience that you accidentally delete the used disk image when virtual machine is running? I would expect that the virtual machine will fail immediate, but, surprisingly, it ...
1
vote
2answers
85 views

Linux KVM guest hanging after several weeks

I've got a Linux KVM guest that hangs after several weeks. Looking at the virt-manager window shows 100% CPU usage. virsh reboot guest doesn't take any effect, the guest needs to be forced off. On ...
2
votes
1answer
91 views

Detect spikes from other VPS

On a KVM-based VPS I am using to run Ubuntu and various Web services, and I am experiencing spikes a few times a day when database access seems to be much slower than normal. Is there any way I can ...
0
votes
1answer
66 views

missing network usage through iptables

I inserted a rule to iptables to track the input usage to a certain ip address. The vps server's IP is 192.168.1.5 and the guest os's IP is 192.168.1.115. I ran 'yum update' inside the guest OS to get ...
0
votes
1answer
81 views

Slow network interaction between 2 kvm host machines

We have 2 physical machines, Host1 is a CentOS 6.4 kvm host and hosts ~7 kvm VMs all running Ubuntu 12.04 - all of this runs perfectly. Recently we've added a 2nd host system, host2, again a CentOS ...
2
votes
2answers
331 views

How to detect hypervisor host name/IP from inside a KVM virtual machine?

We have a small fleet of KVM/libvirt hosts with a few hundred virtual machines on it, managed by a group of sysadmins in disparate locations. I've run into a problem where I am connected to a virtual ...
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votes
1answer
114 views

Kvm poor cpu performance

I have running some Minecraft Servers in a Qemu VM over Libvirt, and the performance is only half good than on real hardware. Libvirt started the vm over: /usr/bin/kvm -S -M pc-1.1 -cpu ...
0
votes
1answer
291 views

Running KVM in KVM with a Windows 2012 guest

I have a VPS running on KVM but my hoster doesn't support Windows 2012 yet. For some applications (Signalr) I need W2012. What would be the impact of running Centos6 as the primary guest (KVM host) ...
1
vote
1answer
182 views

Proxmox - Assign more memory to KVM VM

Is it possible to assign more memory to a KVM virtual machine without restarting it? I changed the memory size of a VM using the Proxmox web interface, but can't see that increase in the guest.
1
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2answers
111 views

KVM CLI install for CentOS 6.3 defaults to Minimal Install

So I now I've installed KVM (and its associated tools and packages- libvirt, VMM etc.). On the GUI (i.e using the VMM), installation works as its supposed to. However, when I try to create a VM using ...
0
votes
2answers
477 views

How to efficiently share host's folder with KVM guests?

I am configuring the service which stores plenty of files uploaded by nginx in /srv/storage dir on host system. These files are processed by worker KVM guests which may create new files or assign ...
1
vote
3answers
155 views

Storage for KVM virtualization

I am looking into setting up 3 kvm hosts. Currently I am using local storage with mirrored drives raid 1 for images. I am also using raw images. I was wondering if this is against best practices and I ...
1
vote
0answers
117 views

Proxmox 3.0 installation on any VPS

I have an account on digitialocean.com I create a droplet debian wheezy. I installed proxmox 3.0 manually via command line. At the end of installation I restarted the server but again it uses default ...
0
votes
2answers
109 views

KVM WinXP guest on physical drive

I want to migrate my Windows VM from VMware player to KVM. All documents I found deal with disk images, however my current VM is installed on real NTFS filesystem, located on separate SATA drive. Is ...
0
votes
2answers
427 views

How safe is it to access qemu/kvm raw or qcow2 disk image files from host

I've read mixed opinions about how safe it is to modify qemu disk image files. There are two distinct situations I'm interested in. 1) let's take a raw or qcow2 disk image file not used by kvm (i.e. ...
0
votes
1answer
125 views

Single NFS-server to redunant NFS-storage

Currently, we have 6 physical host machines installed with Proxmox VE. These hosts are running a number of virtual machines. Mostly Windows Server 2008 R2. The hosts are Intel Blade servers with a ...
0
votes
0answers
68 views

KVM .img can not boot after resized by virt-resize

I have a CentOS 6.4 image install by KVM on Ubuntu 12.04 amd64 host. Here is the disk layout of centos.img # virt-filesystems --long -h --all -a centos.img Name Type VFS ...
1
vote
1answer
178 views

reseting password not working in KVM guest

I lost the root password for a guest system. I mounted the guest system and changed it to single user mode. Then I used virsh console to access the guest system, which was now in single user mode, ...
0
votes
3answers
639 views

KVM 802.1q (tagged VLAN setup)

I've done a lot of reading about VLAN tagging in KVM bridged networks, but am getting very confused as to what needs to be tagged (the physical network devices, or the bridges attached to those ...
1
vote
1answer
80 views

Migrating to kvm

Ours is a small setup. Currently we have two windows/hyper-v servers running around 8 ubutu server virtual machines. The virtual machines were built long time back to the extent that ubuntu version is ...
0
votes
1answer
115 views

KVM firewall to disallow internet access for group of guests

I've got a KVM server inside a local network (192.168.10.0/24). This server has three interfaces, which are all publicly bridged [1]. Atm I'm only using two of the three interfaces, so the virtual ...
2
votes
1answer
199 views

GRE Mesh to GRE Star in open virtual switch

i have 3 kvm hosts running open vswitch with many virtual machines. These vms are on two separate tenants and GRE tunnel carries private traffic between these 3 hosts. But is there a better way to ...
0
votes
1answer
143 views

qemu-kvm fail to boot Centos 5.3 after Kernel update at the host (feodra)

After updating Fedora 18 to kernel 3.9.x (current 3.9.4), I can no longer boot my Centos 5 guest OS. When I try to boot, the process halt at start and the CPU core work at 100%. If I boot Fedroa ...
1
vote
1answer
75 views

updating shadow file in a KVM guest in a mounted system

I have a KVM guest that I need to reset the password. If I use 'virsh console' to access the guest account, I'm able to update the shadow file with a new hash line like ...
0
votes
1answer
138 views

KVM Physical NIC access

I'm new to KVM. I have a host with 4 NICs. I want to set this up, is it possible? eth0+eth1= bond0 -> internal network build two guests each guest will have network access to 2 subnets ONLY eth2 -> ...
0
votes
0answers
157 views

kvm guest having temporary network drops

I have a Scientific Linux 6.3 KVM host running 2 nearly identical Ubuntu 11.04 guests. I built 1 base image and then cloned. Each vm has mysql and different RoR app installed on apache, using nginx as ...
1
vote
3answers
410 views

Standalone KVM server best practices

I'm looking at ordering a powerful server machine to use for virtualization. I'm planning on running debian with KVM+QEMU for the virtualization, and a hardware RAID6 to store the VMs on. I would also ...
1
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0answers
142 views

Assign IPv6 addresses to kvm virtual machines using DHCP

I created a bridge using brctl called dhcp_test_br, and bind my new created kvm virtual machine to this bridge. Then I ran dnsmasq: dnsmasq --strict-order --bind-interfaces --interface=dhcp_test_br ...
1
vote
1answer
339 views

Kvm Guest Network Unreachable

I have a kvm setup with several guest vms running ubuntu. For some reason I cannot get traffic through port 80 from the guests to the outside anylonger. The other way round works just fine, the ...
2
votes
0answers
46 views

calcru: runtime went backwards (FreeBSD) [duplicate]

I have installed a fresh FreeBSD 9.1 machine running in a virtual KVM environment. After some days of uptime I always see the following messages for various PIDs in the system console: calcru: ...