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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IPv6 on Azure VM

I have an Azure VM and it works fine with IPv4 Tried to directly associate IPv6 to it, but couldn't connect to the outside world, a simple ping ipv6.google.com hung (according to Microsoft, it is ...
DMaxter's user avatar
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6 votes
2 answers
7k views

How to enable SSH into an Azure Windows VM?

I need to use a Windows machine for a program that only works on Windows. I set up a Windows 10 virtual machine on Azure. On the Azure portal, at the virtual machine, under Connection, I see the ...
miguelmorin's user avatar
6 votes
1 answer
3k views

dircolors: no SHELL environment variable, and no shell type option given

On interactive login I get: dircolors: no SHELL environment variable, and no shell type option given But I do have SHELL variable set: % set | grep SHELL SHELL=/bin/bash SHELLOPTS=braceexpand:emacs:...
LetMeSOThat4U's user avatar
6 votes
2 answers
2k views

Causes of RTP jitter at the server

Investigating some call quality issues (0.5 – 1 second dead spots in calls) I took a packet capture of a phone call between two extensions on the same PBX. Since I was capturing from the PBX, I was ...
miken32's user avatar
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How can I increase the throughput/bandwith of my virtual network?

I have some virtual machines servers with some micro-services and do some load tests with JMeter. All the servers including the JMeter machine are sharing the same virtual network. The virtual network ...
Eduard Florinescu'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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6 votes
1 answer
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Most VMS refuse to start [closed]

Setup: Virtual Host, running server 2012, hosting around 10 production VMs Problem: Last night, 2 VMs stopped with no warning, event log notification, or any information. The rest of the VMs on this ...
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5 votes
8 answers
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Light Weight Virtual Machines / *nix Distributions [closed]

Does anyone maintain a list of Light Weight *nix distributions, ideally just a VM that can be downloaded.
Richard Stelling's user avatar
5 votes
1 answer
63k views

CentOS 7 Minimal Install doesn't comes with networks scripts? Which version to use then? [closed]

I'm installing CentOS 7 as virtual machine but I'm having some problems related to network. As image shows I select Minimal Install for later add trough YUM any packages I want as for example: PHP, ...
ReynierPM's user avatar
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5 votes
6 answers
16k views

Windows 7 x64 - free virtual machine host applications running headless

Given a machine configured with : Windows 7 64 bit a CPU that DOESN'T support the Intel hardware virtualization Are there any free, non-time-sensitive virtual machine hosts that can host either 32 ...
p.campbell's user avatar
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5 answers
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"live" mirror of HA VM cluster?

I'm reading about HA techniques in virtualization but all solutions I see work more or less just like more specialized VRRP - when host gets down, VM is booted up on another virtualization host. If ...
Lapsio's user avatar
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5 answers
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What might increase delay of ssh connection?

I have VMware Workstation and after some time I started to notice, that after inserting username ( during ssh connection ) it takes longer and longer to prompt for password. I installed Ubuntu Server ...
Eugene's user avatar
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1 answer
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What is the difference between "turn off" and "shut down" in Windows 7 version of Virtual PC?

In Virtual PC (on Windows 7) what is the difference between choosing Shut Down vs. Turn Off?
Clay Nichols's user avatar
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5 votes
4 answers
2k views

Renting Virtual Machines for testing [closed]

I am looking for renting virtual machines for testing my desktop software. In particular, I am interested in all modern Windows client versions (XP no SP, SP1, SP2, SP3, Vista with/without SP1/2, ...
Michael Pliskin's user avatar
5 votes
3 answers
3k views

Windows Virtual PC and VirtualBox on the same PC

I am running Windows 7 Professional x64. Presently I am using Windows Virtual PC. I'd like to try VirtualBox. Can both virtualization platforms be installed and run on the same instance of Windows? ...
PaulWaldman's user avatar
5 votes
6 answers
1k views

Deploying virtual machines - Windows Guest/Linux Host or vice versa?

I'm looking to deploy several virtual machines for users. They need access to both Windows and Linux. They also need to use the computers graphics card (for Photoshop, modeling, etc) under Windows. ...
samoz's user avatar
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5 votes
5 answers
317 views

What should be considered when purchasing a virtual machine set up?

I've been asked for an opinion about a purchase of a blade server that should be used for running virtual machines. I have very little experience in this, so what things should be considered in terms ...
Spoike's user avatar
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1 answer
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Proxmox. ERROR: Backup of VM failed - CT is locked (backup)

I tried to create backup of the container (LXC) in my Proxmox and I get the error: INFO: starting new backup job: vzdump 206 --node my_server --mode snapshot --storage backups-stor --remove 0 --...
Stan Zeez's user avatar
  • 251
5 votes
3 answers
2k views

Automating virtual machine creation across multiple hypervisor platforms

Is anyone aware of a tool for automating the creation and deployment of virtual machines across different hypervisor platforms? I work on web applications running on EC2, Xen, KVM, and VMWare, and I'm ...
Cerin's user avatar
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5 votes
1 answer
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How to change a VM from split across multiple .vmdk files to a single one or two?

I have a VM with 3 partitions. One main one, one for swap space, one for storage. However, there are dozens of .vmdk files. Some of those .vmdk files are very large (over 1 GB), but the majority ...
coffee's user avatar
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5 votes
4 answers
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Disable Time Synchronization on Ubuntu

I am setting up a development environment with Ubuntu in a virtual machine. The date in the VM must be in 2009 due to some silly timebombing issues, so I want to disable any automatic time ...
Andres Jaan Tack's user avatar
5 votes
4 answers
4k views

Start Windows in virtual machine from real hard drive partion

Is there any virtual machine under Linux which can start Windows (XP) from real hard drive partition, not from emulation image?
user20272's user avatar
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3 answers
12k views

esxi vmdk out of disk space

One of our highly utilized vm is giving the error that there is no more space for the the vmdk shown in the following image. The VM won't start because of this issue, so I'm not able to delete data ...
joebegborg07's user avatar
5 votes
2 answers
12k 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 ...
user208509's user avatar
5 votes
4 answers
54k views

Unable to ping between host machines and guest vms running on Vmware

In order to learn a bit about system administration, I've installed a Centos vm using Vmware on my local machine running Windows 7. Everything seems to be working fine since I can access the internet ...
mowwwalker's user avatar
5 votes
2 answers
1k views

Cheap server platform with support for >12 GB RAM [closed]

I'm looking for the currently best (as in value for the money) cpu/chip/motherboard combo to build affordable application servers that support a lot of RAM (at least 12 GB; better more). As I want to ...
Dennis G.'s user avatar
  • 355
5 votes
1 answer
444 views

With a vsan issue where you cant access vcenter, should you ssh into all machines and power them down prior to restarting esxi host?

So I have a vsan cluster, 4 esxi hosts all contributing to vsan as well as compute. Vcenter lives in esxi01. Esxi01 is not responding and I cannot open the web gui. I can still ping every vm and ssh ...
IT_User's user avatar
  • 210
5 votes
1 answer
963 views

VMware disk usage and thin provisioning: numbers don't add up?

I'm trying to make sense of the (thin provisioned) disk space on VMware ESXi 4.1 (using vSphere Client). The numbers I see don't add up and don't make sense. Looking at the machine properties for an ...
Mei's user avatar
  • 4,600
5 votes
5 answers
3k views

Web-Based Virtual Machine Manager

I am looking for a web-based virtual machine manager, which will work on our Ubuntu server. Ideally, I need something that our team can use to create a VM, test builds and packaging and then either ...
Pete Redhead's user avatar
5 votes
4 answers
6k views

How do the Hyper-V machines get identical IPs even the physical machine has only 1 Network interface?

In windows 2008 we can have multiple Hyper-V instances on the same physical machine. Generally that machine has only 1 network interface. (I assume 1 card with 1 MAC Address). Then how do the Hyper-V ...
Chathuranga Chandrasekara's user avatar
5 votes
2 answers
224 views

Looking for way to expose and extend 100s of USB connections from VM cluster(s)

We currently test a very large number of devices and we have one PC per 10 devices or so (we use two USB hubs per PC to break out to the devices). We have huge number of PCs and it's turning into a ...
Mike's user avatar
  • 399
5 votes
2 answers
14k views

How to get public IPs on ESXi VMs?

We have a dedicated server with a hosting provider. We are running ESXi 6.0. The server has a single public IP which is currently being used for the management interface. The provider has also ...
user avatar
5 votes
3 answers
4k views

XenServer Performance

we've got 2 x HP DL360 G5s with Quad Quad Xeons 2.6GHz and 32GB of memory each running XenServer 5.5 and they access an OpenFiler box (with 8 x 320GB SAS 10K drives) via copper CAT5 (1GB) for the ...
eth0's user avatar
  • 153
5 votes
2 answers
346 views

Windows Server 2012 Cannot Read Disk As Guest OS In ESXI

I'm running into a frustrating issue with Windows Server 2012 and VMWare ESXI. I'm running ESXI version 6.5 (old I know, but this is not the issue) with a VM running Windows Server 2012. On this VM, I ...
xevana7245's user avatar
5 votes
2 answers
88 views

avoid redundant writing of virus scan signatures in VMs on same disk [closed]

I have two VMs on the same disk that each have clamav installed. Both regularly run updates for the same virus scan signatures simultaneously which results in an unnecessary strain on the performance ...
schf1919's user avatar
5 votes
2 answers
6k views

SSH painfully slow on my local network?

I have a CentOS 6-x64 Server running through VirtualBox on Windows Server 2012R2, but whenever I SSH into it, it's painfully slow. This happens for both Putty on Windows, and SSH on OS X. I've read ...
ecnepsnai's user avatar
  • 234
5 votes
2 answers
6k views

Configuring RAID on a VM Host for best performance of multiple Virtual Machines

What is the best way to configure disks in a VMWare server that will be hosting multiple machines? A single RAID 5 array hosting multiple VMs would provide good throughput but means all VMs are ...
DrStalker's user avatar
  • 7,036
5 votes
4 answers
4k views

Hyper V - Read Only VM

We have a couple of test VMs which we use to test software on. We would like to have a virtual machine revert back to a saved state everytime the VM restarts. I believe virtualbox calls this feature ...
user avatar
5 votes
3 answers
7k views

Clock synchronisation on kvm guests

I'm having trouble keeping the system clocks sync'd on a number of kvm guests. I've googled a fair bit, and found a lot of different options, many of which I've tried, to no avail. So here I am. ntpd ...
DictatorBob's user avatar
  • 1,644
5 votes
6 answers
40k views

Google Cloud Services - unable to SSH into instance at all

I am unable to SSH into my instance on the Google Cloud Services. I am not very well versed in VM management and troubleshooting, but have tried everything I knew, and google could provide to me ...
CaptClockobob's user avatar
5 votes
1 answer
564 views

Last powered off date for a vm in Hyper-V 2016

In Hyper-V 2012 when we had the configuration of a vm in the xml format, one could look up the last_powered_off_time node in the vm's configuration .xml file: <last_powered_off_time type="integer"&...
Oliver Nilsen's user avatar
5 votes
1 answer
2k views

How can I stop Azure from randomly replacing network cards on VMs?

Azure seems to have the habit of randomly changing the hardware configuration of virtual machines, without telling anything to the user. This is of course mentioned in the documentation, although ...
Massimo's user avatar
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5 votes
1 answer
5k views

Configuration Defaults for VMWare vSphere Virtual Machines

We have a number of hosts running VMWare ESXi 5.5 all attached to a vCenter instance. We access and manage all of our VMs with the vSphere Web Client. A number of people who do not necessarily have ...
computmaxer's user avatar
5 votes
1 answer
1k views

Should APIC be used on VMs?

I'm provisioning some VMware and Virtualbox VMs, both 32 and 64 bit and all my boot commands start with /install/vmlinuz noapic. Searching for information about APIC etc. around the web doesn't give ...
thasmo's user avatar
  • 257
5 votes
3 answers
455 views

Linux Kernel Virtual Machines

I've been running KVM for a few of the management servers at work, I've actually been very happy with it all around, and now want to move to the next phase, and deploy some heavy services (data-mining,...
khosrow's user avatar
  • 4,173
5 votes
1 answer
18k views

How do I copy/paste to a VM console window in the VMware ESXi HTML interface?

I have an Ubuntu VM in an instance of VMware ESXi 6.7.0. I am using Chrome to access the VM console in the HTML interface of VMware ESXi. (I do not have SSH access to the VM.) I would like to copy/...
pacoverflow's user avatar
5 votes
2 answers
2k views

NFS Performance issues on Oracle Linux 6.7: Shared libraries on NFS slow down system

I am currently hunting down some performance issues on some VMWare virtual machines with the same amount of memory and cpus, running Oracle Linux 6.6 (Kernel 2.6) and 6.7 (Kernel 3.8). The machines ...
Nodebody's user avatar
  • 151
5 votes
1 answer
3k views

VM-VM only network with KVM

I'm trying to create a VM only network where guests can speak to each other, but not with the host. I want to isolate the host for security reasons, as multiple test users will be using the VMs. ...
Joseph Rogers's user avatar
5 votes
2 answers
4k views

Proper Hyper-V Network Configuration for Windows Server 2012?

We just put our first Hyper-V based web solution online about a month ago (Diagram below). We're having intermittent communication issues between Virtual Machines during periods of elevated traffic, ...
Sam's user avatar
  • 423
5 votes
3 answers
32k views

Unable to ping VirtualBox guest with Bridged Networking

I'm running VirtualBox 4.2 on Windows Server 2003 and I am trying to ping the IP address of the guest virtual machine from the Windows host (ICMP is not being blocked). The guest is 192.168.0.1 and ...
Howiecamp's user avatar
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