Virtualization is a group of software technologies that allow abstraction between layers of a system. This allows separation between the logical layers of the system, providing isolation, flexibility, and/or the ability to run more than one at a time. This differs from most traditional systems where ...

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13 views

migrate xen server to new HDD

I have a Xen Server with multiple VMs that are mirrored with DRBD to a Backup Server, and it's running out of space. I want to migrate it to a bigger Harddisk, but I'm not sure about how to go about ...
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0answers
15 views

libvirt: can it provision network interfaces where the network backend is running in a domU rather than dom0?

Thanks to a great blog post, only slightly out of date [1] I've managed to configure a dom0 which has no networking at all: physical network interfaces are passed through to dedicated domU guests ...
2
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0answers
28 views

Security concerns w/ physical vs virtual network gateways [closed]

I am in the process of setting up a private network that uses a gateway system for access to certain services on systems behind the network, e.g. ssh, ftp. I have some experience using virtualized ...
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3answers
78 views

Booting hypervisor and network stacks using PXE Server

I am trying configure server using PXE boot. I successfully installed ESXi hypervisor using PXE and would like to know if there is a way by which I can specify Virtual machines at the time of PXE ...
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0answers
37 views

Enabling SSLv3 in vCloud Director 5.6.x

We have some legacy systems that use SSLv3 but vCloud Director disabled SSLv3 by default from version 5.5.3, see: ...
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1answer
58 views

How do I safely clone a Linux VM in Hyper-V?

This is a home lab, so nothing critical. I have a base Linux ISO I'm installing for all my VMs, but the install takes a long time, and even once it's done, I still have to go install a ton of updates ...
1
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2answers
26 views

Setting up emergency console access with xen

On Gandi (or other providers) you can activate an emergency console to your VM. It binds a SSH channel to a temporary IP and port. I have my own server running on xen. I would like to implement an ...
2
votes
2answers
246 views

Install windows 2012 R2 over KVM-virtualizaton

I'm trying to install Windows Server 2012 R2 over linux KVM-virtualization. The installation process stops and requires drivers to continue. I'm trying with virtio drivers from fedora but doesn't ...
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1answer
55 views

How do i find the overcommit ratio for CPU on a KVM host or for that matter on any hypervisor?

I have a host and I have installed KVM on it.Now I need to know how much overcommiting of resources it allows, CPU, memory. Is there some command to get the ratios or it all exists in theory and no ...
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0answers
47 views

Datastores Occasionally Disappear on vSphere Client

I'm currently running several virtual servers and connecting to the vCenter using the vSphere Windows client. We're connecting with to a datastore on another server which has a separate folder for ...
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0answers
403 views

Server 2012 R2 Hyper-V Virtual Switch host mac address conflict 331FLR

I have 3 new HP DL360G9 servers all running Server 2012 R2 standard with the Hyper-V role installed. All the servers have the built in Intel 331FLR 4 port gigabit nic. I have the ports teamed into 2 ...
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1answer
24 views

How to edit the XML config file of a domain with virsh? [closed]

How to easily edit the XML config file of a domain with virsh?
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1answer
67 views

What FQDN should I use for Postfix setup in Satellite Mode on Ubuntu VM on VirtualBox?

I am getting lost with trying to configure Postfix on a Ubuntu 14.04 VM running on VirtualBox. The VirtualBox has 2 NICs: 1)NAT and is Internet access through my computer running the VM and ...
1
vote
1answer
38 views

Persistent ESXi iSCSI datastore from guest VM based target? [closed]

I'm in the process of building a home lab environment for Cisco and VMware that will also double as a NAS. The system runs ESXi v6.0 bare metal. Part of my design is that I have a Lenovo TS440 with ...
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0answers
22 views

How to hot add a new disk with virsh attach-disk?

I'm trying to add a new LVM disk to my guest machine (Ubuntu 14.04.1) by doing the following on the host: lvcreate -L 14G -n vm_vm005_data3 vg00 virsh attach-disk vm005 /dev/vg00/vm_vm005_data3 ...
1
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1answer
54 views

how do I clone a disk that is represented by a vmdk file?

I have VirtualBox installed on Windows 8.1. I have created a CentOS 7 virtual machine that loads the contents of a detached hard drive that is connected to the PC via a SATA Wire. The virtual ...
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0answers
15 views

Can I install openstack shared services on a compute node?

I am currently evaluating Openstack as an alternative to VMWare for our company. I would like to install Openstack on a Dell FX2 chassis with three physical servers in it. I was wondering if it was ...
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0answers
37 views

Stucking qemu-kvm process

What i have: CentOS 7.1 as KVM host - Xeon E3-1200 v2, 32GB RAM, with and without dedicated raid controller (i tried both options) 3x Ubuntu 14.04.2 as quest VM (3 CPU, 512MB RAM on each VM) host ...
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0answers
37 views

Autostart VM on Witsbits (ClearVM) Server

I am setting up few VMs on my Witsbits (ClearVM) server. They are easy to setup and manage but... I would like to start VM together with the server. The management interface allows for manual ...
0
votes
1answer
59 views

Is it possible to migrate a Parallels Desktop Windows VM to Mac OS X BootCamp?

I have a Parallels Desktop virtual environment that includes software that cannot be reinstalled elsewhere. It's native to that VM. I'm running the environment on my Mac Mini and am seeing huge ...
0
votes
1answer
26 views

Postfix not receiving mail for virtual domain from outside (only locally)

I have postfix mail server running at mail.123.com (ip eg 1.1.1.1), then I have site books.com (ip eg 2.2.2.2) and it's DNS records like this: MX record as mail.123.com A record mail.books.com same ...
1
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1answer
61 views

SSH fails often when contacting VM from remote machine

I have a Windows 8.1 Host in which I installed ubuntu server 15.05 in a virtual machine. I set an SSH server in the guest (ubuntu) and then I create a forwarding rule from the host port 2222 to the ...
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1answer
15 views

Application Virtualization Risk Through WAN / Internet

I was weighing pros and cons about the new mission critical system that through application virtualization, will allow my colleagues from 3 different countries to access it. Here are some background ...
1
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2answers
72 views

Virtualization: vCPU pinning with Hyperthreading Host CPU?

I'm using KVM/libvirt on a Linux server with Core i7-2600 CPU, which has the following CPU topology (1 Socket, 4 Cores, 8 Threads): Physical | Logical ---------+-------- Core 0 | 0, 4 Core 1 | 1, ...
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2answers
37 views

How to check the number of CPUs and cores from host with virsh?

How to check the number of CPUs and cores available in the host machine using virsh?
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3answers
2k views

Virtual machines and I/O heavy workload, is it ever sane?

I have seen on numerous virtualization services (Azure) and products (vmware,kvm,hyperv) I/O and system stalls under heavy I/O workload. My questions are: Is it ever sane to use a Virtualized ...
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0answers
41 views

Proxmox Virtualized Client (Network Configuration)

first some information about me. I ordered a server from ovh and purchased one failover ip to test proxmox and do some training. The main Server is hosting proxmox(Example IP: 123.45.67.89 to figure ...
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1answer
117 views

Installing Server 2012R2 on VM with GPT harddrive issues

So... long story short I'm working on automated installations of Windows Server 2012 R2 on systems with GPT drives both physical and virtual. I haven't brought the disk back down stairs to the ...
0
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2answers
79 views

Should I backup from within each guest, or from the host?

I'm searching for advice on whether backups are better taken from within a guest (e.g. ShadowProtect), or from within the host (e.g. copying virtual disk files, or other software). We have 12 VM's (a ...
0
votes
1answer
122 views

Switching back to libxl from xend without rebooting

I did something dumb: I enabled xend over libxl and started an instance with xend. Now, libxl won't start any instances, even though I got rid of all the xend instances and stopped xend: root@xen1 ...
1
vote
1answer
16 views

How to prevent openvz container from adding another ip address?

How to prevent openvz container from adding another ip address ? I'm using VETH Container. I used this command to configure the network : vzctl set xxx --save --netif_add ethx,,,FE:FF:FF:FF:FF:FF
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0answers
82 views

How to pass boot paremeters to a XenServer HVM? Is it even supported?

I'm willing to build up a fully automated installation of CentOS 7 over XenServer 6.5 using kickstart. According to XenServer 6.5 Documentation, CentOS 7 is now supported in HVM mode: In XenServer ...
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0answers
17 views

hardware requirements for 4-6 VMs [duplicate]

I’m planning on buying HW for running 4-6VMs on my home network, hosting some web-pages and desktops and running an NVR for 3-4 cameras, and have no idea what I can get away with on the hardware side ...
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0answers
13 views

OpenSUSE Xen Multiple Apache VM's

I am attempting to set up an OpenSUSE 13.2 server with Xen Hypervisor installed. The problem I have now encountered, is how do I route the correct requests to the correct VM instances. Lets say I ...
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0answers
42 views

Automatically upgrade virtual machine in load balanced set on Windows Azure

I have been serving web content off of a Linux VM running in Windows Azure, and now want to make a duplicate virtual machine and create a load-balanced set to handle more load and avoid downtime. I've ...
0
votes
1answer
67 views

Convert virtual disk image to physical disk?

I'm trying to use QEmu for Windows to convert a virtual disk image to a physical SSD. But I'm not sure about the syntax for the output_filename parameter. Here's what I tried: qemu-img convert -p ...
0
votes
1answer
39 views

NAT forwarding (whole IP) working only on some ports

Since my hoster doesn't allow briged setups I had to go for a NAT solution to run my CentOS VM on an additional IP and my host machine on the primary IP. Now, I've got a problem since for ports 22, ...
1
vote
1answer
49 views

How to virtualize a dedicated server [closed]

I have a dedicated server with the following configuration : CPU : AMD Opteron 4386 Cores/threads : 8c/8t Fréquence/burst : 3,1 GHz+/3,5 GHz+ RAM : 64 Go DDR3 ECC 1066MHz ...
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0answers
100 views

How to assign dedicated vCPUs to specific VM on Proxmox (KVM) or what system could do that?

I'm posting this here, because what I've found about the topic is either outdated, incomplete or not suitable for various reasons. I have wanted for a long time to learn how to map specific vCPUs to ...
0
votes
0answers
40 views

Filtering KVM guests with IPtables

My partner has a server with OVH that receives a constant variety of ddos attacks, while still staying up. We want to use IPtables on the host to filter the guests VM's traffic. The guest VM we want ...
2
votes
4answers
238 views

Bare metal hyper-visor that supports viewing it's own guests [closed]

I'm trying to understand if it is possible to have a Type-1 Hypervisor (bare metal, no host OS) with the ability to view the guest(s) operating system(s) on the same machine. i.e. I have a XenServer ...
0
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1answer
70 views

What it means when Linux has no I/O scheduler

I have some virtual machines running Ubuntu cloud-based image 14.04-1 LTS version. I wanted to see the IO performance of different IO schedulers on the VM so I went to ...
2
votes
1answer
115 views

How much of a performance does using QEMU virtualization incur on Windows?

How much of a performance does using QEMU virtualization incur on a Windows host, when both the host and vm are running the same CPU? Older articles indicate that using kqemu avoided the slow down in ...
0
votes
1answer
104 views

What hypervisors support vGPU? [closed]

Does anyone know if any open source hypervisor supports vGPUs? It looks like XenServer and vSphere are the only two hypervisors that support virtual graphics cards (true vGPU, not passthrough or ...
0
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1answer
54 views

ubuntu kvm disk io slowdown after some tyme

Host system: Ubuntu Server x64 12.04 mdadm raid 1 (/dev/sda /dev/sdb) no lvm dd bs=1M count=256 if=/dev/zero of=filename conv=fdatasync avarage ~ 40 MB/s NCQ on disks is disabled WriteCache is ...
2
votes
1answer
187 views

Install RSAT-Hyper-V-tools fails on Windows Server 2012 R2 Server Core

When I try to install Rsat-Hyper-v-tools with powershell command: add-windowsfeature rsat-hyper-v-tools -includeAllSubFeature It fails with error saying that: The source files could not be ...
0
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1answer
46 views

Xen hypervisor component/plugin development [closed]

I am new to virtualization as a concept, and am particularly interested in Xen. A machine is a complex system composed of many parts/constituents: CPUs (one or more) RAM Hard drive Network card ...
0
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0answers
33 views

Docker: display information for each pulled layer

Whenever I pull an image from a registry, Docker pulls not only the image, but also additional layers. Is there a way to tell docker to be more verbose about the layers? E.g., if I $ docker pull ...
3
votes
0answers
44 views

Ensure docker pulls most current image

Assuming I have registered a repo at Docker Hub, called MyRepo. Assuming I am working on a Docker image called MyImage. Assuming I have configured Docker Hub to build images from Dockerfiles ...
4
votes
1answer
94 views

Count number of allowed CPUs in a Docker container

My specific scenario is the following. I launch a docker container with a specific cpuset: docker run --cpuset-cpus="0-2" # ... inside that container I run a shell script as the entry point and ...