Questions tagged [virtualization]

Virtualization is a group of software technologies that allow abstraction between layers of a system. This allows separation between the logical layers of the system, providing isolation, flexibility, and/or the ability to run more than one at a time. This differs from most traditional systems where the various layers are inherently tied.

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vmdk image without /dev/root

I have vmdk server image without /dev/root, I want to deploy it with DigitalOcean (they support custom images). I created images, started droplet, but unable to connect via ssh. I entered ...
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How can I identify a virtual box physical disk from linux command line?

I'd like to know how to identify which /dev/sdX disk is the physical vdi disk of virtualbox. I've seen a UUID in Virtual Media Manager vdi disk information, is there any way to check it in Linux? I ...
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Installing virtio drivers on windows server 2016

I am trying to install virtio drivers on a VPS I bought and i installed a windows server on via an unintended method. But I am stuck... I don't have an internet connection to the server. So I cant ...
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What is anonymous huge pages in node exporter?

Prometheus' node exporter has 2 metrics named as node_memory_AnonHugePages_bytes and node_memory_AnonPages_bytes. What do these measure? For a object detection flask app that ran across a bare metal ...
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ESXi Cannot start VM's - Error unrecoverable error: (vcpu-0) [closed]

I'm unable to power on the VM's on the new ESXi. I'm running ESXi inside virtual box and have enabled nested virtualization. I tested the ESXi using Qemu but it can start only 32-bit VM's. But in ...
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KVM bridge only assiging ipv6 adresses on VM

I use KVM in bridged network mode so I can have a VM that has an IP from the host LAN network. My host (Ubuntu 18.04 server) networking is configured as below : network: ethernets: enp0s31f6: ...
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Zabbix Server configuration Inquiry

I hope I’m posting in the right place. So, I have a question. I’m trying to set up a simple network monitor (Zabbix) in VirtualBox to monitor the hosting machine. I have everything set up, but the ...
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Why SSH still works after applying SNAT and DNAT rules to forward ip (on the SSH server)?

I have the following situation: I have a Ubuntu Server VM with a bridged network adapter (let's say its ip is 192.168.100.3) that exposes an ssh server on port 22, the VM is hosted on a Ubuntu ...
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Resource utilisation split in virtualisation platforms

I'm having a Hyper-V hypervisor and am running a CentOS 7 VM on top of it. The VM houses certain microbenchmarks (sysbench, stream, iozone and netperf) and I'm trying to study the effects (utilisation)...
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VMWare Sphere ESXi - ASUS Hyper M.2 x16 Gen 4 (PCIe 4.0 / 3.0) - Gammix. Device Offline

I installed ESXi 7.0 in my server. I'm using the ASUS Hyper M.2 x16 Gen 4 (PCIe 4.0 / 3.0) adapter to add 4, 2 TB Gammix S11 PRO SSD disks. I changed the bifurcation in the BIOS, and ESXi detect 4 ...
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Avoid host to connect to kvm vm and to extract data from vm

I use kvm with libvirt and i want to avoid host to extract data from a virtual machine. It's possible that the host can fall in bad hands and that is why i want to protect the vms. How can i protect ...
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Co-locate VM on a single/set of core(s)

I'm trying to understand certain impacts of virtualisation on performance by running benchmarks on VMs. I'm considering ESXi and Hyper-V as the hypervisors. I wanted to know if I can pin a VM to a ...
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python virtual environment on rolling distro (Arch)

I am a big fan of the rolling distribution model. I do need help with one hiccup. when I create a virtual environment in python to isolate a project all works great until my rolling distro upgrades ...
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Proxmox VE - problems in setting private network

I have recently bought a test dedicated server from to test proxmox. The installation went smoothly; however, I get stuck in the network configurations. My Use case- I want to create 8 LXC containers ...
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Merging avhdx checkpoints into vhdx under Qemu/KVM

I recently switched over from Hyper-V to Qemu (KVM), and in migrating my VM’s unpleasantly discovered that I had neglected to use the Hyper-V tools to merge one of my Ubuntu VM’s disks containing ...
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Are there container orchestration platforms (e.g. k8s) that allows nodes to be containers, in production?

Existing popular platforms do not allow this: As per k8s docs: A node may be a virtual or physical machine The same is seen in k3s docs: A server node is defined as a machine (bare-metal or ...
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Can i run Ubuntu WSL2 on a VPS which runs Windows Server 2022 Datacenter

I want to use a 8GB RAM, 4 VCore VPS Server which my hoster Contabo offers with Windows Server 2022 Datacenter image. This is for a build server that should generate executables for Windows and Linux....
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http error 403 for vsphere login page

I am running a vcenter server, and created a desktop shortcut for the vsphere webclient login, it works well, but after a certain time, around 2 weeks the desktop shortcut will no longer work, and ...
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Assigning a Public IPv4 automatically to every KVM VM thats being created?

Im wondering how would i go on about assigning a public ipv4 to each vm thats being created. Setup : Host Server with 3 IPs on CentOS8 using libvirt and kvm to virtualize Bridge br0 using eth0 as ...
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Folder/source code sharing options between linux guest and Windows host [closed]

Host is Windows 10, guest is Ubuntu server, running under Virtual Box. Desired feature is to be able to share a folder containing source code between these too. Basically I want to be able to edit the ...
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How to containerize a Linux native application in order to have multiple versions of it running at the same time from mostly the same codebase?

I have a Linux server application that is no longer supported by the vendor. I need to run 2-3 versions of this application at the same time in parallel. I can set up different VMs for it, and it ...
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Configuring different apps in Nginx using same domain

I have an ecommerce application running 2 applications. App 1 (example1.com) is written as react.js and built as a normal html site. Nginx is serving this on port 7000. App 2 (my.example1.com) is a ...
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virbr0-nic unmanaged in KVM/Cockpit

I am running cockpit on Rocky linux to make a KVM host. I have installed and enabled all 4 nics onboard and they are showing up as managed in the management tab except virbr0-nic when I run the create ...
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Checking if NIC controller has SR-iov capability

I'm trying to use SR-IOV with openstack, and in order to check if the NIC available on my servers support this technolony I did the following: (venv) [root@controller share]# lshw -c network -businfo ...
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Alternatives to vMotion for moving virtual machines to a different Datastore

The company i work for is running a small virtual environment and has several virtual servers on 2 different ESXi hosts managed by a vCenter, for reasons relating to backup verification i need to make ...
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minikube not running with virtualbox, how to fix that?

I am using windows 10 professional edition. Installed virtualbox and also enable virtualization on bios, that's why able to run windows 10 64bit machines as VMs in virtualbox. When I started minikube, ...
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Is there a way to automatically install vmware tools on new Windows server VMs upon VM Creation in vCenter7?

We are running vCenter7 to manage our virtual machine infrastructure, i am trying to set up backup verification with nakivos screenshot verification feature, however when the flash VM boot job ...
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qemu-kvm snapshot creations are extremely slow after a few first fast ones

Could anyone help me on this please? behavior I'm running several VMs with qemu-kvm and when creating some first few snapshots of a running VM, they are created super fast (roughly 10 seconds). ...
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removing inaccessible datastore in vmware nfs41 - not typical sytuation

after storage metrocluster failure my datastores became inaccessible. I logged into esxi host via ssh listed storages and removed them using following commands: esxcli storage nfs41 list esxcli ...
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Cannot connect to OPNsense web console from LAN

I'm facing a strange issue with a new install of OPNsense on ESXi 6.7 that I hope someone can help me figure out. I'm thinking the problem is on ESXi not OPNsense, since I had a working setup using ...
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XenServer Dynamic RAM on Task Manager

I'm new to XenServer, I use XenServer instead Hyper-V because Hyper-v Getting some issues with many VMs on the same host XenServer is a good place for Cloud services, but I got a small issue I have ...
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VirtualBox on linux: hangs on __lock_acquire on Fedora Core 35

VirtualBox (VirtualBox-6.1.x86_64) has for sometime been useless on my workstation (Linux FC35,kernel is 5.16.12-200.fc35.x86_64+debug: but the issue existed previously on FC33). The GUI starts, but ...
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Check computers on network for core isolation

Trying to find best method for checking all domain computers for core isolation being enabled. We have been slowly enabling this as new machines are deployed, but I would like to expedite the ...
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QEMU - (Index=0) exists

I'm getting this index=0 exists error when I try to run qemu with this specific lines: Command: qemu-system-x86_64 ` -cpu "Penryn-v1" ` -boot order=c,once=d ` -m 4096 ` -smp 2,sockets=2,...
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How to extract errors and warnings from the log file of a virtual machine hosted in VirtualBox

Host: Centos 7 Hypervisor: VirtualBox 6.1.32 Virtual machines: One Windows Server 2016, One Linux Centos 5, Two Windows 10 Pro I want to search for errors in the virtual machines log files. Is there ...
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Why do I see many "kernel: vif ...: Guest Rx stalled" / "Guest Rx ready" messages?

Since upgrading a Xen host that also is a node in a pacemaker cluster from SLES15 SP2 to SLES15 SP3, I see these messages roughly every 30 seconds, and I wonder: What are these messages telling me? ...
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Infrastructure Modernization [closed]

About 7 years ago, I put in a W2012 Server Infrastructure (Now W2016) for a small (<$5MM) 3PL company. They have (2) locations with most users on prem. The owner had a small budget and I didn't ...
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Does configuring BIOS really solve ESXi CPU Contention?

There's alert coming up on our server saying CPU Contention even if we already isolate that VMguest from another high CPU consuming VMguest: Alert Definition Name: Virtual Machine on a host with BIOS ...
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Google Cloud Windows Terminal Server Load-Balancing

I'm pretty new in the cloud technology and have some general questions for my understanding and maybe you can share your experience with me. As-Is Situation: Currently 3 windows virtual machines are ...
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Server virtualization: what to virtualize?

Several years ago we virtualized our "new" Windows Server 2016 with Microsoft Hyper-V Server 2016 on a Lenovo TS120 with a Xeon E3-1245, 32GB (4x8GB) and 2x2TB@7200RPM (RAID1) (the ...
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Gitlab-runner using Virtualbox VM stuck in 'poweroff' state

The Problem After a specific project runs on my CI, virtualbox hangs while trying to 'poweroff' the VM. vboxmanage list runningvms shows nothing, but ps ax | grep VBoxHeadless shows the process is ...
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iptables loses source address when forwarding to an internal virtual machine (Proxmox)

I have a Proxmox hypervisor. This proxmox is running a VM with HAProxy load balancer. I am now trying to forward to this HAProxy via iptables port 80 and 443. Unfortunately the source address is lost ...
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Why should I enable promiscuous mode?

I'm currently using an environment lab for testing ESXi so I run nested ESX(two ESX are installed on ESX) The problem is I was trying to install vCenter on both of my lab ESX and at the end of stage 1 ...
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check_kvm_support script failed to start error when attempting to create VM

When I attempt to initialise a VM on Debian 10 instance I am getting an error : multipass launch --name kube-master --cpus 1 --mem 1024M --disk 3G launch failed: The check_kvm_support script failed ...
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What, exactly, is the difference between "host only" and "LAN segment" in VMware?

From what I understand, with LAN segment you have to manually create a route (routing table) while host only does it for you. Can someone clarify?
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PFSense on Hyper-V - Can't Access VMs from hypervisor

I'm hoping someone can help clarify what i'm doing, perhaps i'm missing something obvious, but I'm trying to setup PFSense as a VM on my workstation. I've ceated two virtual switches, one external (...
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Public IP to VM in esxi

So I had proxmox installed but boss decided to install vmware esxi in ovh vps so this is the scenario. I have a server which has esxi and I have purchased a bunch of Ips from OVH since I want to have ...
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Providing Guest VM to connect to Internet through Host on ESXi with only one adapter

I am new to virtualized environment. I have a bare-metal server provided by a hosting company which has ESXi 6.5 running on it. It has only one physical adapter, one Management Network and one VM ...
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Creating new datastore and VMFS [closed]

I was currently working on the ESXi lab and trying to do some work with it. So I have an ESXi that is running on a server and I installed 2 ESXi on it (two ESXi are running on the primary ESXi). The ...
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Virtual CD is not connecting in IPMI JViewer

I am not able to mount the ISO image in the IPMI Remote JViewer. Earlier I mounted the CD and installed the OS and did some installations also. Now I am not able to mount. It's not connecting. When I ...
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