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.

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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 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 they work. I ...
devcflynn's user avatar
6 votes
2 answers
4k 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 ...
Sha's user avatar
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5 votes
0 answers
2k 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 ...
Jugurtha's user avatar
5 votes
1 answer
835 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 ...
Jason Ward's user avatar
4 votes
0 answers
1k 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. ...
Mr. Mirror's user avatar
4 votes
0 answers
356 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% ...
aggie's user avatar
  • 141
4 votes
0 answers
275 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 ...
Jsmith_iii's user avatar
3 votes
0 answers
3k views

What the best way to export a Vagrant box to OVF?

My goal was to create a Virtual Machine programmatically like you would do for a container with docker and be able to export it in an OVF. So I used Vagrant to create the VM. Combining Vagrant and ...
noraj's user avatar
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3 votes
0 answers
3k views

Nested VM in XenServer

I am new to XenServer. I am having problems getting nested VM to work in my environment. Here is my scenario: I got XenServer 7.6.0 (Free version) running on a bare metal box (SuperServer 1028R-WC1R)....
mprogrammer87's user avatar
3 votes
0 answers
2k views

The driver detected a controller error on \Device\Harddisk0\DR0 on a virtual machine

The event in question is generated by a virtual machine. The disk 0 is a scsi connected drive to the virtual machine. The vhdx file is in the hyper-v cluster which has the storage from SAN cluster. ...
Alwin's user avatar
  • 31
3 votes
0 answers
450 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 ...
Stilez's user avatar
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3 votes
0 answers
51 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. ...
NA1985's user avatar
  • 31
3 votes
2 answers
2k 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) ...
Jerico's user avatar
  • 31
3 votes
1 answer
1k 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 ...
John Corker's user avatar
3 votes
0 answers
496 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 ...
tjcinnamon's user avatar
3 votes
0 answers
32 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 ...
DonMattez's user avatar
3 votes
0 answers
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 ...
Furuvio's user avatar
  • 31
3 votes
1 answer
687 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 ...
BryceH's user avatar
  • 141
3 votes
0 answers
886 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 ...
Meberem's user avatar
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3 votes
0 answers
976 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 ...
Alex's user avatar
  • 181
3 votes
0 answers
339 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 (...
Lyle Brown's user avatar
3 votes
0 answers
107 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 ...
What'sTheStoryWishBone's user avatar
3 votes
0 answers
213 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 ...
HostBits's user avatar
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3 votes
2 answers
98 views

SAN Solution for diverse VM Servers

I recently got my fingers into Server Administration. I am currently the only person administering an air gapped network with 8 sites. Most things are dated and old but I get the money to renew things....
Auberginer's user avatar
2 votes
1 answer
146 views

Sudden low CPU performance

Im running a service on a GCP VM that has, randomly, very low CPU performance. Commands like grep and tail on text files often take up to a minute to start showing otherwise instant outputs. This has ...
Gabriel Lins's user avatar
2 votes
0 answers
57 views

Am I likely to experience less Azure Spot VM instance evictions by creating it in a region that has a large time difference from where it's used?

I am creating a spot VM to be used in offices located in New York. If I choose India as the region, will the time difference between the two regions help reduce the spot evictions because I can expect ...
PrashanD's user avatar
  • 133
2 votes
1 answer
173 views

How to Root volume partition without losing the data

We have this scenario : I to increase the disk space of one of our VM, Disk details : root@Test-01:~# blkid /dev/vda2: UUID="0eae0eb4-92ed-45ec-aa99-6d606f17e70a" TYPE="swap" ...
sam23's user avatar
  • 59
2 votes
0 answers
480 views

How to access from Linux (host) any content that needs the VPN connection running on Windows (guest)?

I'm working on a coding project that needs to access private URLs through a VPN connection. The only way to connect to this VPN is through the company's proprietary software made only for Windows. So, ...
Alberto Labuto's user avatar
2 votes
1 answer
4k views

Best way to enable DDoS protection on many individual GCP compute instances without load balancing?

I've been scouring through the Google Cloud Armor docs for information about DDoS protection of a GCP compute VM instance. From what I've found, Google Cloud Armor Managed Protection provides ...
Alexander Guyer's user avatar
2 votes
0 answers
2k views

How to give each WSL distro a distinct IP address?

How to give each WSL distro a distinct IP address, and then connect to those IP addresses via Windows? I was curious if its possible to setup two different ubuntu distributions using WSL and somehow ...
pico's user avatar
  • 121
2 votes
0 answers
702 views

Event ESENT 508 on an Azure VM

My monitoring system informed me about the following event log entry on my Azure VM (Windows Server 2016 Datacenter): Catalog Database (1180) Catalog Database: A request to write to the file "C:\...
Heinzi's user avatar
  • 2,237
2 votes
0 answers
1k views

Openstack: VM disk I/O Tunning

In OpenStack, I am facing I/O performance issues. I am using virtio-scsi driver support in the quest. Currently, I am getting below mentioned performance. WRITE: bw=37.2MiB/s (39.1MB/s), 37.2MiB/s-37....
gautam's user avatar
  • 21
2 votes
0 answers
559 views

Cannot connect self-hosted Linux VM to Azure DevOps

I am trying to set up a docker deployment process with Azure DevOps using a self-hosted Linux VM as a deployment target. It seems that I must install the AzurePipelines agent on the target Linux VM ...
Ingo Schalk-Schupp's user avatar
2 votes
2 answers
341 views

Error while using template for vm domain join

I'm trying to use below template to add VM to domain in Azure. https://raw.githubusercontent.com/Azure/azure-quickstart-templates/master/201-vm-domain-join-existing/azuredeploy.json (template: ...
Rauf's user avatar
  • 249
2 votes
0 answers
1k views

Guest VMs and host can't ping each other

The host machine runs a newly installed Fedora 31. Using Cockpit, I created two VM running Fedora as well. For the network configuration, I chose the "Direct attachment" type. Now, each VM and the ...
user123065's user avatar
2 votes
1 answer
4k views

How do I disconnect a VM from a Log Analytics workspace that has already been deleted?

I created a Log Analytics Workspace (LAW) and connected the SQL Server to it in order to test a theory. I then deleted the Log Analytics Workspace (LAW) but did not "Disconnect" it from the LAW. I ...
YellowPill's user avatar
2 votes
2 answers
49 views

Decreasing OS drive free space on Azure VM running SQL Server 2016

Recently I noticed that drive C: is decreasing in free space on my Azure VM running Windows Sql Server 2016 (doing daily azure VM backups in Recovery Services Vault). Drive C: keeps adding 100-250mb ...
user_7's user avatar
  • 21
2 votes
1 answer
2k views

RHel 7 converted with qemu-img fails with dracut error at boot

I'll have to migrate several computers from Hyper-V to VmWare. I would like to use qemu-img because is command line and I could create an script. Conversion works fine for Windows but is not working ...
Uh Trog's user avatar
  • 105
2 votes
0 answers
343 views

What exactly is a TX collision in a context of a VM?

I'm inspecting a problem with a MongoDB replica set reelecting a primary multiple times per minute. It seems that there is something wrong with the network configuration, but I can't nail it down yet. ...
Arseni Mourzenko's user avatar
2 votes
0 answers
909 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 ...
hobgoblin's user avatar
  • 121
2 votes
0 answers
64 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 ...
WheretheresaWill's user avatar
2 votes
0 answers
66 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 ...
Miro's user avatar
  • 21
2 votes
0 answers
2k 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 ...
user457526's user avatar
2 votes
1 answer
94 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 ...
M.S.Fajari's user avatar
2 votes
0 answers
2k 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, ...
turbonerd's user avatar
2 votes
0 answers
672 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 ...
C Bauer's user avatar
  • 121
2 votes
0 answers
108 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 ...
user2119805's user avatar
2 votes
0 answers
96 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 ...
Tharanga Abeyseela's user avatar
2 votes
0 answers
1k 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 ...
BobbleHead's user avatar
2 votes
1 answer
3k views

Windowns Hyper-V Virtual Machine shutdown instead of restarting as commanded

I am running a Windows 2016 Hyper-V host with the following VM's 2x Windows 2012 R2 2x Ubuntu 16.04 Whenever I carry out a restart of the VM's after an update they nearly always shut down and ...
David's user avatar
  • 21

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