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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Bridging is breaking the server: KVM configuration

I'm pretty new to networking and just can't get my head around this. I'm trying to setup KVM-Qemu so I can run some virtual machines. The instructions I'm following are telling me to use eth0 and ...
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2answers
457 views

How do I configure bridged networking for VMs

I'm setting up a KVM virtualization server in CentOS 6. How do I configure bridged networking? (I think I need network interface eth0 to be accessible to VMs) I have tried to follow this guide: How ...
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1answer
376 views

CentOS Virt-v2v conversion tool

I am trying to use the virt-v2v tool in CentOS for the conversion of virtual to virtual and eventually physical to virtual machines. I am rather confused after spending a day trying to get the ...
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1answer
167 views

G-WAN 4.3.14 maxes CPU on VPS even when idle

Testing gwan_linux32-bit (4.3.14) on a Digital Ocean VPS instance results in the CPU being maxed even when there are no http requests. The VPS instance has 1 core and 512 MB, running 32 bit CentOS ...
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1answer
110 views

Linux kvm: Public bridge without the physical nic

I have a VM host on the internet with my own subnet. I intended to use bridged networking and simply add my one physical NIC to the bridge and be done. But that had several downsides, not the least of ...
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103 views

How to mount a URL as a CD-ROM on QEMU?

I'm wondering if it's possible to specify a URL for the cdrom option on QEMU, and if so how would I go about doing that? Normally I'd mount an iso like this: <disk type='file' device='cdrom'> ...
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171 views

How do you migrate kvm guests from virtualizor to solusvm ?

I have a server that until recently had virtualizor in standard setup (and hosted a few guests - all kvm) / 200 Gb /vg_guests - 3.4 Tb Recently i stopped and disabled virtualizor services and ...
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1answer
427 views

Is it useful to deploy OpenStack to a single node?

Due to several limitations and only few and expensive offers of Windows-based dedicated servers, I thought about renting a Linux server instead and running even multiple VMs on that server. I thought ...
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0answers
77 views

__ticket_spinlock high cpu

We are having a strange problem on our Ubuntu 10.04 KVM infrastructure, where periodically, one of two vm webservers freaks out, with persistently high load, even if we restart the applications. (the ...
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1answer
80 views

Tracing system calls is slow on a KVM VPS?

I run a website on a KVM VPS and I noticed that processes appear to run extremely slowly when being traced. For example, I ran ls on my home directory, which contains 72 files and directories. With ...
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2answers
544 views

Disable TCP checksum offloading on KVM virtual network

I have a virtual network for connecting KVM guests with the host. I need to disable TCP checksum offloading on this network. The ethtool works fine but I want to disable it permanently and I could ...
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1answer
260 views

bad page map bug during snapshot

I ran the following command to create a snapshot volume. But the kernel received a bug and the kvm hypervisor stopped responding. Why is the error and how to fix it? lvcreate -L20G -s -n ...
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1answer
140 views

Improve Disk Performance of a Linux 2.4 Guest on KVM Host

I have a server running Linux 2.4, and I'd like to virtualize it using KVM. I can run it with a IDE controller, but my applications require more disk performance. The best existing solution is using ...
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1answer
57 views

Live migration (kvm) not working if any I/O operation is in progress [closed]

I did this experiment: on VM I started watching a video on youtube. While video was in progress I started migration. Migration did not complete until video was not finished. I did another experiment: ...
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1answer
147 views

SELinux policy issue

As qemu & KVM are working fine with SELinux out of the box I'd like to enable SELinux to improve guest isolation on my CentOS 6 server. The problem is that I'm using a 3rd parity virtualization ...
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2answers
886 views

KVM: All network traffic to one guest (firewall)

I am currently using a VMWare ESXi 5.5 server for my virtualisation. The network setup is like this: PFSense firewall is the center of it all and connected to: LAN Network (physical NIC 1 assigned by ...
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1answer
86 views

Implementing hardware virtualization for custom hardware

When using QEMU/KVM there are certain network adapters that are supported and emulated. If one wanted to emulate the guest OS's original network adapter (e.g - a Broadcom interface that was present on ...
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1answer
106 views

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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0answers
223 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 ...
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2answers
211 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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0answers
182 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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1answer
74 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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0answers
102 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
335 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
238 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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0answers
55 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
66 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
428 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
673 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 ...
1
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1answer
329 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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0answers
983 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 ...
3
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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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347 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
130 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 ...
0
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1answer
69 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
83 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
152 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 ...
2
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1answer
346 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
236 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 ...
2
votes
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
77 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
187 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
2k 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
116 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
201 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
287 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 ...
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1answer
434 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
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1answer
543 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
199 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 : ...