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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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Can I increase Azure Linux VMs TCP keep alive timeout without using a Load Balancer?

I have an Azure VM running Linux (Ubuntu 18.06). I'm running a Python socket server there. Now, the problem is, any socket client which is not doing any activity for 4 minutes is getting ...
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1answer
17 views

Azure Windows VM set up auto-start/shutdown

I'm just getting stuck at adding permissions for the automation account required to perform the auto-shutdown/startup for this Windows VM. So I'm at https://docs.microsoft.com/en-us/azure/automation/...
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1answer
24 views

Moving a hard drive from one Azure subscription to another

I have a Windows 2008R2 virtual machine in Azure with an extra 1TB HDD data disk attached. Can I detach the HDD and move it to another subscription and attach it to a Windows 2016 Server VM that I ...
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1answer
2k views

Can you specifically assign / bind a virtual network adapter to the server's physical network interface on VMware Workstation?

Hi I'm trying to install Centos and Snort on a virtual machine and is there anyway I can bind the promiscuous virtual network adapter to a specific physical network interface on the server? I'm using ...
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1answer
36 views

Infrastructure - different variants. What are the advantages of the virtualization layer? [on hold]

The infrastructure that I see most often: First infrastructure Can I manage the infrastructure equally effectively using only Container-Optimized OS, management and monitoring tools (e.g. Ansible...),...
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1answer
2k views

Azure : VM fails to connect after being promoted as domain controller

I have few VMs provisioned on Azure, one of them acts as a read only domain controller replicating from a in house domain controller through site-to-site VPN. The problem is every time I create a VM, ...
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2answers
1k views

Drawbacks of setting a high I/O timeout?

I'm working on several Linux VMs whose partitions are mounted on a NetApp NAS. This NAS periodically experiences a very high iowait which causes the VM disks to switch to read-only mode, crash, or be ...
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20 views

Is a Hyper-V Container somewhere between a docker container and a virtual machine?

We know that Virtual Machines have a full OS with its own memory management installed with the associated overhead of virtual device drivers. In a virtual machine, valuable resources are emulated for ...
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1answer
23 views

NTP Servers Not Syncing At Boot

Backstory: I have a couple of internal startum 1 NTP clocks with GPS receivers, and 2 public NTP servers that are virtualized on top of VMware ESXi which take time from the S1 clocks and distribute it....
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21 views

SSH tunnel to share local virtual machine's VPN connection with host? [closed]

I have a local VM running windows 10 on a mac. i use this virtual machine to connect to a VPN. Is there a way, such as an SSH tunnel or something, that I can use the virtual machine's VPN connection ...
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1answer
24 views

How to create azure vm instance on a dual boot linux machine? Is the procedure same as we do it on a virtual machine?

I want to create an azure vm instance anc access it through ssh. But I have a dual booted linux machine. So can I do the same on a dual booted machine or I need specifically a virtual machine to ...
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1answer
264 views

Using audio services on Windows Server 2008 R2

Software that I modified for use in a particular game takes player input, feeds it to a text-to-speech engine, and outputs a .wav audio file, which the game then runs, making the player's character "...
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3answers
11k views

Virtual Audio Cable not working on Windows Server 2008 R2

I have Virtual Audio Cable successfully installed on my Windows Server 2008 R2 SP1 x64 virtual machine. It seem like driver works (new audio device in Device Manager group and VAC control panel works ...
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2answers
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 ...
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1answer
2k views

virsh attach-device for serial device

I would like to add a serial device (console) to a guest via the virsh attach-device command. I have a console.xml file containing: <serial type="pty"> <target port="0"/> </serial>...
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12 views

Hyper-V Virtual Switch not recieving any packets

I have a virtual machine set up with two network cards, one card is connected to a virtual switch for connection to the main network, the second is connected to another external port on the host ...
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1answer
939 views

Backup Hyper-V To Google Drive?

I was thinking about backing up a Hyper-V host to the cloud and a potentially crazy idea came to mind. With Google Drive, you can get 1TB of storage for 2 bucks a month. This would be more than ...
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1answer
2k views

How to diagnose/troubleshoot tftp timeout

I have 2 VMs. One is setup as a pxe server (dhcpd with a specific subnet and a tftpserver). The second VM is networked with 'vboxnet2' to first VM and it is able to get the DHCP IP as specified my VM1'...
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2answers
2k views

Virtual PC: Issues with clock when guest Linux has a different timezone to the host OS [closed]

I'm running Linux (Centos) under Virtual PC in Windows 7. Guest is set to a different time zone then host OS and none of them are UTC. The issue is that when guest boots its time is always set to ...
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3answers
16k views

MSTSC: Black Areas on Remote Desktop

I'm connecting from Windows Server 2012 R2 to Hyper-V virtual machine running Windows 8.1 via RDP (mstsc.exe). The VM is hosted on the same machine from which I'm connecting. Everything was fine until ...
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1answer
2k views

How do you change host management credentials for a cluster in System Center Virtual Machine Manager?

How do you change the Host Management Credentials in System Center Virtual Machine Manager for servers in a cluster? If I right click on the server and go to properties I can see the Run As account ...
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2answers
9k views

How to get internet access in a Windows 7 virtual machine [closed]

I am running Windows 7 Ultimate and have now set up two virtual machines in Virtual PC. One is the XP Mode machine which runs XP (obviously). When I set it's network connection to Shared Networking (...
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1answer
12k 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 ...
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2answers
3k 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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0answers
21 views

Why open files limits set correctly on dedicated server but not on KVM machines?

I have set open files for all users on a dedicated server A in /etc/security/limits.conf like below: * hard nofile 1048576 * soft nofile 983040 And in /etc/pam.d/common-session I have ...
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1answer
2k views

Disable VM Autostart - XenServer

After running updates in XenServer 6.5 I noticed that some virtual machines that were recently turned off started turning on again automatically after the server I applied updates to restarted. When ...
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4answers
5k views

EC2 VM import: VirtualBox

I would like to know if it's currently possible to import a virtualbox vm on the ec2 cloud, I have tried with a virtualbox vmdk but it did not succed. Apparently it is designed for VMware's vmdk files....
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1answer
1k views

How I increase GPU video RAM in virt-manager?

I have this text in my XML <video> <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' ...
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1answer
2k views

Parallels: Trying to boot from SATA drive 1

I'm trying to transfer my windows machine to a virtual machine on my mac. I've tried using Parallels to do so but after trying a few times the data transfer works fine, but the VM always fails to boot ...
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0answers
22 views

internal serial error in Azure serial console

I just installed https certificate via Letsencrypt after that i'm not able to access the serial console in Azure VM as well as via SSH not able to connect. Can you explain me what is the exact problem....
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3answers
2k views

How to install APC on a vagrant box running Ubuntu 12.04 with PHP 5.4?

In my "Vagrant" file I have this line: chef.add_recipe("php::module_apc") But it gives me this error: [2013-01-11T22:14:53+00:00] INFO: Processing package[php-apc] action install (php::module_apc ...
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0answers
60 views

Issues booting VM

I am new to Linux, and have inherited a VM that is running centos. It sat idle for about 2 years with no-one touching it. I have run some updates to get the system up-to-date. I think I accidentally ...
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1answer
2k views

need some way to convert QCOW2 to OVF or open QCOW2 on WINDOWS

is there a way to convert QCOW2 to OVF? or is there a way to open an QCOW2 on WINDOWS (preferably free/open source)? the problem is that ubuntu's virtual machine manager was used to create the image ...
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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 ...
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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 ...
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1answer
18 views

Setting up a dns server with a virtualbox vm running Ubuntu and making it accessible via vlans

I have a virtual box vm I want to use as a dns server for my local network. I have a few vlans setup. The vm host is 10.0.50.2 The vm is 10.0.50.4 I want to keep everyone out of the 10.0.50.4 network ...
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1answer
7k views

Cannot SSH to Azure Linux VM from terminal

ssh azureuser@xxx.cloudapp.net : 22 when I connect and enter the password I created, then it just goes back to the local prompt and does not actually show the remote prompt. I'm thinking I need to ...
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2answers
46 views

High Active(file) Memory Usage in Oracle Linux VMs

I recently searched and read lots of posts and questions about Linux memory management but I can't find my case. For example, there is a question in Unix StackExchange about High memory usage but no ...
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1answer
28 views

ESXi VM to Physical server on the same hardware

I have a Physical server running ESXi 6.0 with a single 64Tb Datastore, One of my VMs has grown to almost 50Tb on this host. I think at this point the best approach is to convert the VM to take over ...
3
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4answers
284 views

MySQL on VM, High IO Wait but low TPS

We are trying to figure out a strange situation on our MySQL installation on VM. We are on Mysql 5.7 and RHEL 7 with XFS. We are observing when we run a few select queries the IOWait races up to 40-...
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2answers
2k views

Hyper-V: Unable To Start a VM From ISO File

Recently I needed to create a new VM, and this VM needed to start from ISO file. When I mounted an ISO file and tried to boot, I’ve seen the following error: Synthetic SCSI Controller (Instance ID ...
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1answer
17 views

Cannot increase disk space of a esxi VM

I wanted to increase the disk space of a VM in my VMware server esxi. I deleted a snapshot that was in the VM, but I canceled this operation unintentionally. Now, I can't see the snapshot in ...
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1answer
47 views

Access Localhost (Ubuntu -VM) from Windows

I use Ubuntu in my virtual machine and start from there my code projects. These project when active can be run under localhost:3000. Now when i execute in Ubuntu ifconfig I get following result: If ...
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1answer
42 views

Ping inexistent IP

I created an internal connection from my Debian VM to Metasploitable, i tried to ping Metasploitable's network address and it works, but when i tried to ping a random inexistent IP i was expecting the ...
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1answer
3k views

Export or Convert Hyper-V VM to OVA/OVF

I can't find (Google) any documentation on how to export or convert hyper-v VMs to OVA or OVF. The hyper-visor is Windows Server 2012 R2 Standard. The results from Google only point to System Center ...
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1answer
62 views

Unable to log into server using Hyper-V Manager

I am running Windows 10 on my client and the "headless" version of Hyper-V 2016 on my server. I am able to remote in to the server and run Powershell on the server. My network connections on both host ...
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1answer
4k views

Moving a Domain Controller VM from one server to another

I have a Hyper-V Virtual Machine that is a Domain Controller, specifically it is our main DC and holds all 5 FSMO roles. If I wanted to move this Virtual Machine to another VM Server than the one it ...
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0answers
34 views

How to run user commands in conf module of cloud init

I want to run a command when an instance is booting up. This command is for accessing an internet (login script). But this command is run at very end in final module of cloud-init. And in other ...
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0answers
12 views

Intermittent: Boot Manager sometimes displays, offering only one OS

Sometimes, upon restart, our PDC will boot into Windows Boot Manager, even though there's only one OS installed in the VM: Here's our BCDEDIT output: C:\Users\Admin>bcdedit Windows Boot Manager -...
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1answer
52 views

validating virtual machine host automatically with fingerprint and something else

validating virtual machine host automatically with fingerprint and something else I've been researching various methods to validate a remote ssh server (virtual machine) automatically and remotely. ...