1
vote
3answers
70 views

VLAN based interfaces for virtual machines

I am in the process of designing an experiment in which we have multiple VLANs arriving at a single NIC, with each VLAN being associated to a single VM. The straightforward way to do this would be ...
0
votes
1answer
15 views

weird bridge issue in KVM

on Centos 6.5 i have a bridge network connected to eth4 and my virtual machine (Centos6.5) running on KVM is also connected to that interface(vnet0) bridge name bridge id STP ...
0
votes
1answer
18 views

Where are rhev templates stored?

I would like to modify a Red Hat Enterprise Virtualization (RHEV) template. I know I could just use an existing machine and create a new template from this machine - but it would require updating ...
0
votes
1answer
76 views

Linux - KVM - very slow disk io

The I/O performance of my new server is pretty low. I Googled and tried everything I can imagine. First of all, here are the Hardware Components: AMD Opteron(tm) Processor 6344 4x Seagate ...
-1
votes
1answer
37 views

KVM Server error

I have installed KVM server in Centos 6.4 and i have created gluster storage pool in that gluster storage pool i have installed some linux and window VM's i have assigned 1GB RAM and 20 GD virtual ...
-1
votes
2answers
152 views

Best type of virtualization when CPU has more threads than cores

I have a 4 cores/8 threads Intel Xeon processor. This is something I tried to particularly ask in SolusVM support, however I haven't got a good reply. I even don't know if they are right: they told me ...
1
vote
1answer
401 views

Ubuntu 14.04 KVM host - not allocating KVM guest correctly, high load

Encountering an odd issue with Ubuntu 14.04 KVM hosts/VMs. We have a number of physical machines, all the same spec, but when we try and start the same type of KVM image (OpenNebula is managing the ...
0
votes
0answers
50 views

kvm linux guest no connectivity

I am running SolusVM using KVM, and network to Windows guests work fine. However, network to Linux (CentOS) guests do not work. Try to ping any IP, but get network unreachable. Obviously it can ...
0
votes
1answer
75 views

Ping (DUP) with Linux bridges and tap devices

http://imgur.com/qPoy2QJ I have two Linux (Ubuntu 12.04) VM (running on KVM) that networked together using two Linux bridges as shown above. The network interfaces are Linux TAP devices. The problem ...
0
votes
1answer
93 views

Relationship between KVM Virtualization Host and Guest resource utilization

I have a KVM Virtualization host with 8 cores and 32GB of RAM. The machine is used to host VMs used in evaluating software, configurations, etc. Typically there are 2-4 VMs running simultaneously. The ...
1
vote
1answer
50 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 ...
0
votes
1answer
83 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 ...
0
votes
1answer
42 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 ...
-1
votes
2answers
126 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 ...
0
votes
1answer
73 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 ...
-1
votes
1answer
421 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 ...
1
vote
0answers
61 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 ...
0
votes
1answer
106 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 ...
2
votes
2answers
83 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 ...
3
votes
1answer
156 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
vote
1answer
123 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 \ ...
2
votes
0answers
146 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 ...
1
vote
1answer
87 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
votes
1answer
188 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. ...
0
votes
1answer
123 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.
0
votes
1answer
295 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
votes
1answer
325 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 ...
3
votes
1answer
118 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
vote
2answers
57 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 ...
2
votes
1answer
53 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 ...
3
votes
3answers
666 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 ...
0
votes
0answers
97 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, ...
1
vote
0answers
333 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 ...
0
votes
0answers
80 views

Problems using wondershaper on KVM guest

I am trying to limit bandwidth on one of my KVM guest using Wondershaper. Doing something like this works fine: wondershaper br23 9000 9000 Doing a wget with the setting above gives a download ...
0
votes
0answers
146 views

KVM - task foo:1234 blocked for more than 120 seconds - howto change task scheduler

I recently installed a new Debian Wheezy server with KVM (the "KVM Host") then installed a Debian VM on the KVM (the "VM"), and got very bad performance on the VM. Looking through dmesg on the VM, I ...
0
votes
0answers
29 views

FUSE KVM with OpenVZ

I have a KVM vps and a OpenVZ vps. I want to FUSE/mount the KVM vps to my OpenVZ vps because the KVM has lots of space but my OpenVZ has less space & high RAM. How can I do this?
1
vote
1answer
1k views

Multiple, different VLAN trunks to KVM guests (Linux)

I've hit a roadblock of sorts with an architectural challenge. I've got a server running KVM - which will feature a number of guests, some running virtualised firewalls and others, just plain web ...
5
votes
2answers
287 views

Optimal kernel configuration and patches for KVM host

I have a server (single socket Nehalem w/ 24GB RAM) acting primarily as a KVM host containing a bunch of Windows Servers and a few (tickless) Linux instances. I usually compile my desktop kernels ...
0
votes
1answer
130 views

add a cgroup controller into libvirt

libvirt by default has cgroup controllers of ["cpu", "devices", "memory", "blkio", "cpuacct"] as shown in qemu.conf. I want to add one more controller of net_cls. I tried to modify the config file to ...
0
votes
1answer
89 views

Is Open vSwitch necessary for my setup?

I've been considering moving my VMware-based dedicated server to Linux using KVM/QEMU. The only major hurdle remaining is networking. My current setup is: NIC <---> Public vSwitch <---> ...
2
votes
0answers
158 views

Why does an IPv6 route added before virtual machine is started not work

I have an external server at Hetzner with Debian 7 and trying to setup KVM with IPv6 Routing (the same setup works for IPv4 without problems). I have one Ubuntu Server VM with two interfaces which ...
0
votes
1answer
415 views

Ubutu/KVM: High iowait on guest nodes, root node fine

Recently one of my boxes has been running quite slowly. It's running Ubuntu 12 LTS and kvm to split the server into several nodes. The box has 2 normal SATA drives using software RAID-1. One of the ...
0
votes
1answer
87 views

libvirtd - Getting vps to use existing bridge

I've been working on getting KVM running on CentOS 6.4 and ran into a snag. After pouring through several online docs about setting up a bridge for the vps to connect to, and manually attempting to ...
0
votes
2answers
402 views

How to mount disk on centos 6.4 KVM server

I have Centos 6.4 on KVM server already up running with couple of sites, now i am almost run out with space so i decide buy from the server provider more gb in order to increase the HDD. I contact the ...
1
vote
2answers
41 views

VNC ports on virtual machines

On Ubuntu 12.04 I use VNC to connect to KVM guests. How can I change the port those use? By default they use port 5900 and increment to 5901 and so on.
0
votes
0answers
82 views

Best way to setup linux gateway and KVM bridge

Ok so I have a Linux gateway host that acts as routing/file server, two NIC's, EXT and INT. Iptables is handling the rules to forward the traffic on a RH based system, as well has having some complex ...
0
votes
1answer
629 views

VT enabled in BIOS but KVM failed to detect

I Have Dell OPTIPLEX 755 machine with VT enabled in BIOS but when i trying to check using KVM i am getting following error I am missing something? root@nova-controller:~# kvm-ok INFO: /dev/kvm does ...
0
votes
0answers
106 views

KVM guest network breaks under load

We've been experiencing network problems in our KVM guests for a long time now, and I can't figure out what the problem is. We have multiple servers hosted at Hetzner in germany, these machines are ...
1
vote
1answer
121 views

kvm - Recover domain from .img file alone

Yesterday I had a drive failure (raid-0) in the host system and had to re-install the os. Fortunately the vps images were on another raid array (raid-5) and the .img files are still available. However ...
0
votes
0answers
250 views

Proxmox Win2012 guest no internet access

I have Proxmox installation with common network layout i.e. as this guy What are the differences in the configuration of the network on Proxmox (KVM)?. I have 3 VMs, 2 with debian, working totally ...