Questions tagged [virtual-machines]

A virtual machine (VM) is a completely isolated guest operating system installation within a normal host operating system. It is a software implementation of a machine (i.e. a computer) that executes programs like a physical machine.

522 questions with no upvoted or accepted answers
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1answer
13k views

Vagrant not ready for SSH error on VirtualBox and Laravel Homestead

Vagrant Version: 1.6.3 VirtualBox: 4.3.14 Ubuntu 14.04 LTS 64 Bit Hey Guys, I have been on this for a pretty good while now and cannot figure this out. I have my public and private keys setup and ...
7
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1answer
6k views

How to use more than 3 virtual disks in Linux using CentOS and XenServer

I've attached 5 virtual disks to a Virtual Machine in Citrix XenServer. The VM has the xs-tools installed. Initially it said that it couldn't add so many disks. After I installed the xs-tools, it ...
6
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1answer
689 views

Checking if two virtual machines are running on the same host

Is there a way to see if several Virtual Machines are running on the same host? Specifically, I have three VMWare VMs (each running a Ubuntu Server 14.04) and I have tried to compare different pieces ...
4
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0answers
347 views

How to get /64 as prefix length when using DHCPv6 and radvd?

For our networking course we were asked to set up a DHCPv6 server in a virtual machine. I choose to work on a virtual machine(on VMware) running Ubuntu Desktop 16.04 and Lubuntu 14.04 as test client ...
4
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0answers
891 views

Disk performance very slow on esxi 6

I have dedicated server with esxi6. I uploaded many iso from vsphere window client and i have 5 vms on it with 2 X1 TB HD SATA. The upload was quick but just now it is taking forever to upload. ...
4
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0answers
219 views

Ping flood from Azure VM to On-Premise Infrastructure

I have deployed a number of Azure subscriptions now with site to site VPN connectivity back to on-premise networks. In one scenario with a client, they have reported that on a regular basis ICMP ...
3
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0answers
230 views

Hypervisor support for vGPU + VM suspend?

Short version - how well do current hypervisors support vGPU with VM suspend/resume capability? Longer version: I've used VMware Workstation for many years in my home lab, with the GPU (used for ...
3
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0answers
48 views

Hyper-V Migration Windows 10

I'm trying to import an exported VM from a Microsoft Hyper-V instance running on a Windows 10 node to another Windows 10 node. As far as I know the 2 hosts are exactly the same in terms of hardware. ...
3
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1answer
358 views

Hyper-V host consuming available memory

I'm a bit new to configuring Hyper-V so this could be a simple question for someone, but I am in need of some advice. I have a Hyper-V host server with 128GB RAM, and all of this RAM is being ...
3
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0answers
341 views

Slow conversion of VDMK to VDI - Virtual Machine Converter 3.1

So I am trying to migrate from VMWare to Hyper-V and I'm using the MS tool Virtual Machine Converter 3.1. However, the VM conversions are going super slow. Like 2MB a second which means that a 300GB ...
3
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0answers
163 views

How to determine the VM limits thresholds on CPU limit from inside a VM or VPS

I was asked to recently to verify that a purchased VM , was provisioned with the appropriate compute from a hosting company. I suspect they are throttling the machines access to the cpu at 8% or 10% ...
3
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0answers
27 views

IIS 7.5 (Win7 Pro x64) AppPool stopping and features mising

i struggle with IIS 7.5. ------Settings------------- Firstly i created a setup of IIS 7.5 on Windows 7 professional, created a website, webservices, databases and so on. On the test machine ...
3
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0answers
3k views

Hyper-V 2012 R2 creates multiple vEthernet adapters

on our Windows 2012 R2 Hyper-V Free server, which will host the VM now running on an ESXi, I messed up launching twice the Add-VMNetworkAdapter cmdlet. These are the steps I took: create a ...
3
votes
1answer
329 views

Move home directory on Azure Linux VM

I continue to encounter an issue moving my home directory to a new disk on a CentOS VM on Azure. On creation the server is configured to use a SSH key for authentication and the "no password" option ...
3
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0answers
772 views

Virtual Machine IP address type changed from static to dynamic

I am testing VMM in a lab environment, I have one VM host machine with one physical network adapter that has been allocated an IP address in the 192.168.1.0/24 subnet on a router. I have create ...
3
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0answers
783 views

Сan I use IOMMU for VT-d to give each virtual machine one at a time GPU?

If I use VMWare with 4 virtual-machines and 4 GPUs (nVidia Quadro/Tesla), then can I give (move) some devices to different virtual-machines for each by a single card? If I have one of these CPU, then ...
3
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0answers
303 views

Recompose a VMware vSphere machine without personal application data loss?

Our organization has converted a large percentage of our employees to VDI. Our logic is that we create a master image for each linked-clone pool, dedicate each linked-clone pool to specific purposes (...
3
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0answers
92 views

VCenter Upgrade Does not work

Task/Details We need to upgrade our Vcenter enviornment from v4.1.0 Build Number: 799345 to v4.1.0 Update 3 Build Number: 816786 Problem After backing up the database and the SSL certificates we ...
3
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0answers
603 views

linux hardware raid 10 / lvm / virtual machine partition alignment and filesystem optimization

I've been reading everything I can find about partition alignment and filesystem optimization (ext4 and xfs) but still don't know enough to be confident in setting up my current configuration. My ...
3
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0answers
211 views

Performance Implications of running multiple Virtual Servers using one base virtual disk?

I tried looking through old questions, but couldn't find one that hit this exact question. In VmWare's documentation on Snapshots, they mention utilizing them for a "process tree" setup. This would ...
2
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0answers
251 views

Imbalanced IRQs on virtio devices

I noticed in the top on my linux server that one cpu had far more number of software interrupts than all other 7 cores. Digging further, I noticed that this core is pinned to a particular irq which ...
2
votes
1answer
1k views

Very poor network performance in HyperV connections routed via a VirtualSwitch vEthernet NAT interface

I have a ubuntu 16.04 LTS guest VM running inside HyperV on Win10 pro v1803 (build 17134.345). The guest does have internet connectivity through a Virtual Ethernet Adapter NAT on the host, but ...
2
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0answers
39 views

Azure classic migration errors

We're trying to migrate a couple of classic VMs in classic vnet over to ARM ('non-classic'). I've been following the Microsoft powershell migration steps here but the migration (and validation) fails ...
2
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0answers
56 views

Export back up copy of VM in Azure

I have set up a linux VM running Ubuntu 16 using resource manager and image from the marketplace. I use only SSE encryption since I do not need extra data drive, and OS manged disk uses SSE encryption ...
2
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0answers
450 views

TURN Coturn Server Azure VM deployed

I would like to know, if anyone has expirience in deploying an coturn STUN/TURN Server on a Azure VM. I have tried and and failed several times to get the TURN Server work. I have followed these steps ...
2
votes
1answer
87 views

VM restart on Southeast Asia Region

Today, few of my VM on azure (centos) restart . I hosted it in Southeast Asia (Singapore). This problem impact to some of service. 1.Is there any issue about it ? 2.Is there any alert if there is ...
2
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0answers
893 views

Hyper-V virtual machine recovery checkpoint problems

One of my virtual machines, backed up by DPM, is repeatedly creating recovery checkpoints and exponentially increasing the storage space required on the host. Three servers involved: Server 2012 R2, ...
2
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0answers
530 views

Hyper-V External Switch and Windows Shares

I'm trying to make a Windows share available to an Ubuntu VM in Hyper-V while also allowing that VM to access the web for ongoing dev work (this is a local ansible host machine, which I don't think is ...
2
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0answers
65 views

NTFS Permissions - Issue With Implicit Denial

I have a network of 4 VMs using Active Directory in a local domain: 2 DCs using Windows Server 2008 R2 Enterprise, 1 Member Server using Windows Server 2008 R2 Enterprise and one Client using Windows ...
2
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0answers
80 views

Convert VM (redhat virtualization 3.5) to a physical server

I have a virtual machine running on red hat virtualization 3.5, i need to convert that VM to a physical server. (mainly due to a performance issue) my volume groups as follows NAME ...
2
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0answers
575 views

Ubuntu KVM virsh console domain connects, but does not load console

I installed a copy of Ubuntu 17.04 using virt-install, on my server (non desktop). sudo virt-install --connect qemu:///system -n wiki -r 4096 --vcpus=2 -f /dev/mapper/vgpool-wiki --network=bridge:br0 ...
2
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1answer
1k views

RTC time is going totally wrong after a few minutes (Ubuntu 16.04 + Hyper-V)

My RTC time on my Ubuntu 16.04 is going crazy. After a few minutes the RTC time is going totaly wrong. The strange thing is, if I disable NTP Service (timedatectl set-ntp false and service ntp stop) ...
2
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0answers
99 views

Is there a “TRIM” command for dmcrypt devices?

When using an encrypted drive in a virtual machine, the VM image starts very small if you do not initialize the drive with random data. When you fill the drive, it grows, but when you delete files it ...
2
votes
1answer
151 views

PDCe won't accept external time source

I noticed our PDCe is running 1:20min late and, of course, also the rest of devices in the network. I'm trying to sync with an external time source but it's not going well. It's a virtual Windows ...
2
votes
3answers
2k views

VM with two NIC on Hyper-V - how to do that?

I'm new to Hyper-V. How do you configure two IP address on the same VM server? Both IP are on different subnets - one in 192.168.x.x and the other 10.x.x.x. There is an uplink (802.1q) between the ...
2
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0answers
128 views

How Hyper-V server 2012 shares processor usage over virtual machine?

I have a Hyper-V server 2012 installed on my physical server (bare-metal). For testing purposes I created 2 VM machines (windows 7) and began testing server processor usage while VM runs at 100% ...
2
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0answers
868 views

“The location constraint is not valid” When Creating Azure VM

I've just signed up for an Azure account to test it out as a possible hosting solution, but when I try and create a VM from the VM Depot I seem to get the error "The location constraint is not valid", ...
2
votes
1answer
146 views

What memory settings aside from page file size are significant for debugging performance issues on Windows Server 2008

While debugging a problem with slow hg cloning from Windows clients, I found that hg clone performance could be significantly improved (10x faster) on EC2 2012 virtual instances by reducing the ...
2
votes
1answer
352 views

Host not responding - vCenter

Few days ago I configured a new vCenter server behind the NAT for my VMware Hosts. Everything is working perfectly on the Management LAN, but the problem is when I'm trying to add a server outside my ...
2
votes
1answer
951 views

Creating a virtual network for KVM guests spanning multiple host machines

I have 5 physical machines running Ubuntu 14.04, all of them are together in a network. These all have static IP addresses. Each of these machines has 1 to 4 virtual machines via KVM/QEMU running ...
2
votes
1answer
145 views

What are the network prerequisites for Windows Azure Pack

I have followed many articles to install and config windows azure pack distributed, But every time I finish configuring everything, the azure pack is not working and give me different errors, seams to ...
2
votes
0answers
486 views

Share serial port between linux containers

I have a requirement to share a single serial port between two or more linux containers. The LXCs are spawned by the host linux. I explored the option of socat, wherein the host will open a TCP ...
2
votes
1answer
52 views

How to spec VM requirements based on historical data of transient processes on Linux?

I've been given a task to break apart the services on one of our main VMs (Amazon EC2) and appropriate additional VMs to suit the services needs. The type of services that I am dealing with are ...
2
votes
1answer
414 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
votes
1answer
722 views

Azure Linux VM Captured, Built from image. Different password or key for new VM: permission denied?

I followed How to Capture an Image of a Virtual Machine Running Linux to capture a VM image, after installing the packages I wanted on top of Ubuntu 12.04 LTS. I turned off the machine following a ...
2
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0answers
97 views

Where do you store shared secrets used in building VMs dynamically (phoenix servers)?

We use vagrant to spin up linux VMs for dev, testing, and evaluation servers for our software. Most often, devs are using linux from VMs inside an AD-connected windows7 box. The configuration of the ...
2
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0answers
224 views

xenserver vm routing fails half the time on the same network

I recently switched from openstack (due to complexity) to xenserver at work, I ran into an issue that I can't solve, I can ping the server all the time but the vms part of the time. here is a ...
2
votes
0answers
296 views

Computer management, Access denied only on win XP VMs

This may take a few lines to setup, so bear with me. My company runs vmware, mix of win xp and win 7 VMs. My tech group have admin rights throughout the domain. We're having some scanning issues ...
2
votes
2answers
2k views

Private networks with SCVMM 2012 SP1 and Hyper-V

In my lab I have two hyper-v host running Windows 2012 server. For lab and test purposes I want to have private networks that are available on both hosts, and where the VMs on those networks are able ...
2
votes
2answers
4k views

Can't lock vz with proxmox

I would like to backup my virtual servers to move them away. And when i have started the backup process then i only see this every time: Feb 09 08:40:34 INFO: Starting Backup of VM 101 (openvz) Feb ...

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