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.
727
questions with no upvoted or accepted answers
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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 ...
6
votes
2
answers
4k
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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 ...
5
votes
0
answers
2k
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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 ...
5
votes
1
answer
835
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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 ...
4
votes
0
answers
1k
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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
votes
0
answers
357
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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%
...
4
votes
0
answers
275
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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
votes
0
answers
3k
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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 ...
3
votes
0
answers
3k
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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)....
3
votes
0
answers
2k
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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. ...
3
votes
0
answers
450
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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
votes
0
answers
51
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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
votes
2
answers
2k
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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) ...
3
votes
1
answer
1k
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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
votes
0
answers
496
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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
votes
0
answers
32
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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
votes
0
answers
3k
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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
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 ...
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 ...
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 ...
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 (...
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 ...
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 ...
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....
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 ...
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 ...
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" ...
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, ...
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 ...
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 ...
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:\...
2
votes
0
answers
1k
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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....
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 ...
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: ...
2
votes
0
answers
1k
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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 ...
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 ...
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 ...
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 ...
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.
...
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 ...
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 ...
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 ...
2
votes
0
answers
2k
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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
1
answer
94
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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
votes
0
answers
2k
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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
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 ...
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 ...
2
votes
0
answers
96
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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
votes
0
answers
1k
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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
votes
1
answer
3k
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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 ...