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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“Error: Unknown error” when trying to start virtual machine from VMware server

Problem We are running VMware Server 2.0.0 build-116503 on a Ubuntu 10.04 LTS server. There is a virtual machine installed, running Lotus Domino on Windows Server 2003. Ever since a sudden power ...
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36 views

ASP.NET Performance Counters Temporarily Drop To Zero

Having some performance issues with a VM Image (I do not have access to the VM Host, only the guest OS). Trying to determine why there are periods of time ranging from 10-60 seconds where the server ...
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59 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 ...
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27 views

Converting virtual drives from .vmdk to .vhdx produces huge files

I'm using powershell and ConvertTo-MvmcVirtualHardDisk cmdlet to convert .vmdk disks into .vhdx disks to be able to run them in our hyper-v environment. For some reason, the .vhdx files produced are ...
2
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0answers
68 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% ...
2
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95 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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388 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", ...
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22 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 ...
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439 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 ...
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59 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 ...
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172 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 ...
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327 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 ...
2
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0answers
209 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 ...
2
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488 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 ...
2
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0answers
188 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 ...
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0answers
23 views

Export OVF fails with “File not found” error

Good morning/afternoon/evening all: I am having an issue with a single Virtual machine when it comes to exporting an OVA/OVF. I recieve a "File not found" error that appears to be pointing in the ...
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31 views

Cisco vWLC sha2 certificates not supported bug?

I currently have an app running with a Cisco virtual Wireless Lan Controller, all works fine except we get some error messages regarding SHA1 certificates, when I'm looking for SHA2 support the cisco ...
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72 views

xinetd service is up but not listening on port 23

I am trying to open a telnet connection from a Wheezy VM to a router in GNS3 but even though the ping is successful, I am unable to open a telnet connection from the VM to any of the routers. the ...
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79 views

How to add a serial port to a Windows 7 guest VM using Xen server 6.5?

We wonder how to add a SERIAL PORT (COM2) into a guest HPVM Windows 7 64 bits in a xen server 6.5 bare metal hypervisor. We have some clients connecting through RDP v8.1 (from Win7-64 to Win7-64) ...
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177 views

High IO wait times on DigitalOcean VM

I've had a DigitalOcean VM running Jenkins without any problems for the past year-ish. This week suddenly problems started happening. It started with that one day I noticed some apt related process ...
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137 views

Using KVM with macvtap and VLANs for VM

I want to use the optimizations given for the ASAv (Page 18) which should run with KVM. I am using Ubuntu 14.04 LTS and I should configure macvtap for an higher performance. It just says the ...
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285 views

Virtualbox keeps aborting

I'm running Windows 7 Enterprise on my host, and a Ubuntu VM on Virtualbox. My VM keeps aborting periodically. This is what I see in my logs: VBox: 00:00:35.201091 supR3HardenedErrorV: ...
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25 views

Profiling agent failed to upload log snapshot to Microsoft Azure storage account

I publish Azure Web Role project with CPU profiler on. When I request Profiling Report, I get 19:04:43 - Connecting to the Profiling agent on the VM instance 19:04:44 - The Profiling agent is ...
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67 views

High CPU Usage Top isn't Showing Processes

Hey I'm having a weird issue that I'm having some difficulty diagnosing. I have a VM that went down due to high CPU usage today. The websites on this VM are very low traffic, so I knew something ...
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75 views

Hyper-v virtual machine acting as two separate vm's

I have a Hyper-V virtual machine (vm1) that has two separate instances of itself. I can log into what should be the same VM (vm1) through Hyper-v and RDP (Remote Desktop Connection) with the same ip ...
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101 views

Set custom cpu string for qemu/kvm

I have some virtual machines with software, which licensing check depends on cpu string. They're running on kvm - with default cpu string value - which is QEMU Virtual CPU version 1.7.1 After ...
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137 views

Windows 7 Pro 64-bit Standard User Default Profile: Local Group Policy or Sysprep?

I have a Windows 7 Pro 64-bit machine that will be hosting three Windows 7 Pro 64-bit VMware Player 7 virtual machines. I have the first VM completed and am about to create the first standard user on ...
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980 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 ...
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145 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 ...
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648 views

How to make sure file in VM's folder is copied with VM when cloning VMWare Virtual Machine

I am running a vmware environment (Version 4 unfortunately) which requires me to use a bios rom file in order to run server 2012. I upload it to the root folder of the VM after creation, before boot ...
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73 views

Is it possible to manage group of vms in openstack as a single instance?

I am reviewing openstack technology as a possible solution for creating sandboxes. What I am going to do is to create instances that contains several vms connected within virtual network. There will ...
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170 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 ...
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152 views

Processes surviving Windows VM reboots?

Summary: A long-running virtual Windows Server 2012 system this weekend became very slow; from remote we did Restart-Computer -ComputerName xyzzy -Force, which succeeded by all accounts; except that ...
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126 views

Destination Host Unreachable and Communications link failure when I connect to MySQL database using D2RQ library

I have a question: I have a web service which runs on a virtual machine located on a remote server with Ubuntu 12.04 operating system. Now, I want to test this Web Service and I'm using this code ...
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0answers
43 views

VMs with same name an IP

Does Foreman support managing several VMs with same name and IPs, but with different certname? for example: NAME IP CertName VMLinux001 10.0.0.2 VMLinux001@domain.com ...
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334 views

Hyper-V VMs keep losing network connection

We had a major power loss in our server room two days ago and several Cisco Nexus 2232PP FEX devices went down. We were able to get everything back online, but since that event we've been experiencing ...
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0answers
68 views

Mysql with low memory on development environment

How to set mysql to run on very low memory? (preferably under 100MB and max 250MB) Currently it's running for about 400mb. I can't turn off the innodb because production using innodb. Is there any ...
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484 views

Make other VMs show in Network on windows server in Azure

I'm deploying a desktop app that connects to a remote database. standard 2-tier setup, but it's not a web app. People will log in via RemoteApp. But I'm having trouble getting the app instances in ...
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856 views

Configure Windows 2012 VHD to boot in Windows 2008 R2 Hyper-V

I have a server running Windows 2008 R2 and Hyper-V. I use this server routinely to create Windows 2008 R2 and Windows 7 VHDs to boot within Hyper-V and natively. I have created a VHD, used imagex to ...
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483 views

Unable to install windows 8.1 on virtual machine

How can I create a Windows 8.1 virtual machine using Proxmox? I downloaded the evaluation copy of Windows 8.1 Enterprise. However when I boot up the virtual machine, it cycles between the two below ...
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0answers
184 views

PHP scripts on live Apache servers consume more memory?

Lately, I've been spending time trying to optimise PHP code. I develop on localhost inside a VM and have been putting the memory_get_usage() at the end of scripts to help do this. The localhost uses ...
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0answers
339 views

How to install Gitlab in a VM on a production server?

I have a production server running Ubuntu 12.04 and I would like to install on it a VM with Gitlab (using Vagrant and Virtualbox). Let's say that the address to access Gitlab is gitlab.mydomain.com . ...
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127 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 ...
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491 views

Update clock on virtualbox virtual machine with cent os from host

I have a virtual machine, with cent os installed, and everytime I sleep the host computer, the clock of the VM goes out of sync. I would like it to pick up the current time from virtualbox - which I ...
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0answers
70 views

How to configure on which server a VM is created in Oracle Cloud Control & Oracle VM Manager?

The hardware configuration is fine and I can reach my two servers in my serverpool. The problem is that I have to use two different brand of servers on which server 1 has Virtualization Technology and ...
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1k views

Puppet agent (v3.0.1) hangs connecting to master (v3.1.1) in VM behind firewall (with NAT based access)

I am using puppet agent v3.0.1 (On FreeBSD), trying to connect to a puppet master v3.1.1 (On Ubuntu) and the puppet agent hangs with the following debug output: puppet agent --debug --no-daemonize ...
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110 views

Storage vMotion fails with a DMotion error

I've ran into an issue where several servers that I've been trying to migrate to different datastores the past few days are unable to migrate properly. Rather than migrating like normal, the servers ...
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84 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 ...
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555 views

Set up LXC container as VM with its own IP address

I need to set up a fenced environment in on Ubuntu server. The actual use case is to have two separate websites running on the same physical box, but I want one of those websites running in a fenced ...
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371 views

ejabberd on vm not connect to another xmmp server (iptables dnat dport 5269)

i migrate a ejabberd server to a vm with only private ip. is work fine but not connect to anothers xmmp servers. log: s2s connection: xxxx -> gmail.com (remote server not found) telnet test: telnet ...