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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libvirt/qemu network guest dhclient 10.0.2.15 instead of 192.168.122.2

On the redhat host, virbr0 is up and libvirt's network is configured as nat for 192.168.122.2-254 (and recently added rule specifically to assign 192.168.122.2). but dhclient with the ubuntu VM gets ...
Will's user avatar
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Exploring Advanced CPU Virtualization: Amalgamating Cores for Enhanced Performance [duplicate]

Virtualization experts! I have a question that revolves around a potential CPU virtualization concept illustrated below. Is there an existing implementation of this idea, or are there hardware ...
pmaniyan's user avatar
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Installing CentOS and Windows Server on the Hypervisor [duplicate]

Hello Server Fault community, In our company, we are planning to install an ERP system, and the system provider has specified the following server requirements of the application: CPU: 1x CPU Intel ...
Zak Rovsky's user avatar
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17 views

Looking for a good approach to set up an F5/Netscaler lab on MacOS (docker + virtualuzation)

To explain myself - I mainly work with Load Balancers - up to now I used VMWare to set up a local lab with couple of F5s and Netscalers, some web server in the backend, and from time to time a Windows ...
Bartosz Cieszewski's user avatar
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How Windows Host can access Guest OS by name

The host OS is Windows, Guest OS is Linux running on VirtualBox. I setup Network and can access the Guest OS from the Host by IP address. Let's say this is IP 192.168.22.10. This part makes sense ...
Ayman's user avatar
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Move applications and DB to docker or vm

I have one server with one public IP. Apache2 is installed. Mariadb is installed. There are about 50 identical Java applications running on Tomcat on the server. The applications are running on some ...
Kamil Sz's user avatar
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Nvidia-smi missing GPU with SR-IOV disable in bios

I have a HPE serveur (DL385) with 3 Nvidia A100 in it. It is running ubuntu 22.04 with kernel version 6 (I have tried with the 5). By default, it was in energy saving mode in the BIOS. When I tried to ...
Guillaume Lechantre's user avatar
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Veeam replica timeout

I'm encountering an issue during a Veeam replication job, specifically a "Preparing replica VM Error." The error message indicates: "A connection attempt failed because the remote site ...
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824 views

KVM: qemu-system-x86_64: cannot set up guest memory 'pc.ram': Cannot allocate memory

When trying to start a VM (1GB allocated) I have run into memory allocation issue even though I have more than enough memory on the system (16GB): error: Failed to start domain exampleVM error: ...
LetMeSOThat4U's user avatar
1 vote
1 answer
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Filter packets with iptables on a tap interface

I'm trying to write firewall rules to prevent a guest machine from accessing the internet. The server (Ubuntu server 22.0, using KVM) has a physical connection (enp34s0), which is connected to the ...
Amit's user avatar
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ESXI RAID : add an extend to existing VMFS datastore

I noticed in ESXI (6.5) there is option to create something like software RAID, but it is called "Add an extent to existing VMFS datastore", does anybody have experience of what it does and ...
Jozef's user avatar
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The GPU usage provided by nvidia-smi command is very different from GPU metrics from guest OS

I'm working on a project that can monitor virtual machines' vgpu usage. The hypervisor is vCenter, we have nvidia A16 cards installed on vCenter hosts, and assigned a16 vGPU to a couple of windows VMs ...
zb2939's user avatar
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3 answers
90 views

In cloud, is it possible to access guest VM from host machine?

In KVM, it is possible to access the guest machine from the host machine. For example, you can SSH to the host machine and then access the guest VM by virsh console vm_name. Is that possible in cloud? ...
Noob_Guy's user avatar
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4 answers
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Building a low-cost, high-availability cluster using Windows Failover Cluster or Proxmox

I need to build a high availability cluster (key functionality, SLA almost 24/7) for virtual machines (AD DC, FS, WSUS, Print server, one Oracle database, a few Linux (not important to business). ...
sokar's user avatar
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KVM guest/VM use host/physical VGA port

Is it possible to use the physical video interface (hdmi or vga, onboard), so that a VM can be viewed/used thru it? What I want it to plug a monitor on the host and see the VM graphical interface.
user17467472's user avatar
2 votes
1 answer
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Virtual Tape Libraries for Microsoft Data Protection Manager - Replacement for Crystalink Firestreamer?

What VTLs do you all use to allow DPM to store off-site? My current environment uses Microsoft DPM for all of its backups. DPM stores the backups locally just fine, but to get it to store digital ...
The ITea Guy's user avatar
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I cannot access website on VM in Hyper -V within LAN

Good day great minds, i cannot access my webserver behind an nginx reverse proxy within my LAN network. i have a mikrotic router with a LAN network 192.168.143.0/24, i deployed an hyper V server that ...
deji's user avatar
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1 answer
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Internal network drops connection to our own locally hosted web server on a disjointed network

In time I have my internal network drops all connections to my locally hosted website. After rebooting the web server all internal connections to the website works again, but it is only a matter of ...
MeSo2's user avatar
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AMD driver doesn't load after rebooting vm with GPU passthrough on virt manager

I'm having an issue with GPU passthrough, using virt manager on Debian 11. It's a very specific question, but i hope that someone can help me with this. I have an RX 5500XT GPU, and i passthrough it ...
Joabeslopes's user avatar
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Migrating 9 virtual machines to 1 server or pc

I have a build system set up which has 5 pcs and that has a total of 9 virtual machines using Hyper-V. I want to update this infrastructure and cut out the need for 5 physical pcs. Is there a way to ...
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135 views

Assign a VLAN directly to a physical interface

does anyone have an idea how to assign a VLAN ID to a physical interface under Linux? More specifically I have a proxmox server on which Opnsense is virtualized. There are VLANs set up and on a ...
Jonathan's user avatar
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130 views

debian server fails to initialize on login load and other related problems

Very good day/afternoon/night, I have finally decided to expose my problem after trying several options, but unfortunately none of them is related to my issue. The case is that we have a debian server ...
mamptecnocrata's user avatar
-1 votes
1 answer
238 views

Making all Linux network interface (bridged) in a qemu VM use dhcp

I have a small application which takes in kernel code, and spins up VMs. I've been using this for kernel development. It is helpful and very fast when I want to spin up VMs with different kernel codes....
Haris's user avatar
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I cannot see my OpenVPN TAP adapters in Hyper-V external switch bridging

I cannot see my OpenVPN TAP adapters in Hyper-V external switch bridging. Is it even supported in Hyper-V? I do not see any documentation where it says it is either supported or not. I have Windows 11 ...
falhumai96's user avatar
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2 answers
117 views

How to access service from virtual machine of another machine in local network?

I have two Ubuntu machines A and B in my local network. Computer B has an openmediavault instance set up via KVM. Computer B has the IP address 192.168.177.58, the openmediavault instance provides a ...
user7468395's user avatar
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648 views

ceph "permission denied" when adding storage OSD

I just setup three storage nodes for ceph in a qemu/kvm environment to learn about it. OS is Ubuntu Server 22.04 LTS. The ceph and ceph-common packages are from standard repos. I followed the ...
user5717448's user avatar
-1 votes
1 answer
132 views

How can I stop a VM guest from being able to access the host's LAN (and the host itself)?

I'm running an Ubuntu 22.04 host with a 22.04 guest (using Multipass). Currently, the guest can access the LAN and the host. How can I prevent the guest from accessing the LAN, while still allowing it ...
TheGooseLord's user avatar
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42 views

Hyper-V (Windows 11) - Disable all network access on host but not VMs

Is it possible to create a setup where the Windows 11 Hyper-V VM host has all network access completely disabled, but the VMs running on it still retain full access? In a model similar to what Qubes ...
Ruslan's user avatar
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1 answer
148 views

Is it possible to mount an .iso file to the CD/DVD device of an VMware Workstation using command line?

I'm on Windows and using VMware Workstation as my virtualization tool. Normally, if I want to mount an .iso file to my guest VM, I can do it through the GUI: I want to know if it's possible to do the ...
Fajela Tajkiya's user avatar
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0 answers
50 views

How to Add vip to vps?

I have a ubuntu vps and it is accissble by its ip. I want to add a vip to it which let clients connect to it by this vip from internet. I have a floating ip from other subnet and it is added to my vps ...
Ehsan Hosseini's user avatar
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2 answers
21k views

How to fix "ERROR [internal] load metadata for docker.io" error while using Docker?

I am compiling sources of one cosmos-based blockchain projects on my MacOS. This project using Docker. I installed Docker and it seems running properly. But at the and of compiling I got this message ...
Vitalii Tsyhulov's user avatar
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0 answers
105 views

How to make KVM guest configs persistent across reboots/shutdown

I create a KVM Guest VM (virsh define a.xml, virsh start a.xml). Guest uses pre-configured/pre-made QCOW2 disk image, which represents a virtual router (Arista vEOS). Host is Redhat 9.1. Guest is ...
Mo Fatty's user avatar
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2 votes
0 answers
115 views

Connect (create ethernet link) between two VMs using their assigned SR-IOV Virtual Functions (VFs)

I have two KVM virtual machines created on RHEL9. I partitioned an SR-IOV-capable Physical NIC such that I was able to get Virtual NICs (Virtual Functions) from it. For each VM, I assigned it a VF. ...
Mo Fatty's user avatar
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1 answer
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QEMU SMP options

I'm trying to understand the QEMU smp option. Currently I have set it to: smp 4 As far as I understand that should create 4 vCPU (with 1 core and 1 thread I suppose). Would it be better for ...
Maestro's user avatar
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1 vote
1 answer
645 views

Determine QEMU KVM overhead?

My guest OS shows about 5 percent CPU usage, but my host machine shows the QEMU process taking about 25 percent. I'm trying to understand where this difference comes from, as I am using KVM ...
Maestro's user avatar
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0 answers
52 views

QEMU load average vs cpu count

When I configure more CPU cores, the load average in my Guest OS as shown by top also increases linearly. I'm trying to understand why this happens, because I expected either the opposite or at least ...
Maestro's user avatar
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6 votes
1 answer
2k views

Does installing NTP mean I'm installing an NTP server?

Reading this: What are the limits of running NTP servers in virtual machines? (2010) And this: https://github.com/geerlingguy/ansible-role-ntp I'm not sure what exactly I'm installing. Especially if I'...
KoenDG's user avatar
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1 answer
37 views

Is "Virtual Dedicated Server" a correct name? [closed]

I've been searching for differences between servers and came accross VPS and VDSs. Which are accordingly Virtual Private Server and Virtual Dedicated Server. For example in GeeksForgeeks they say that ...
1amroff's user avatar
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0 answers
77 views

How to bind mount /sys/kernel/debug with systemd-nspawn?

--bind /home bind mounts /home, but --bind /sys/kernel/debug only leads to an empty directory. Any other options needed? Thank you!
Martin's user avatar
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112 views

Fedora does not boot when it is installed / virtualized using virt-manager and later booted using the qemu parameters (using /dev/sdd as disk)

I'm on Debian 11 (where I'm using the default qemu version 5.2) and I'm trying to boot Fedora 37 using the following qemu commands : /usr/bin/./qemu-system-x86_64 -enable-kvm -m 8G -machine q35,accel=...
Marietto's user avatar
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virtual pfSense setup with virtual interfaces

I am running a linux Desktop, for virtualization I am using QEMU/KVM. In order to properly test my ansible Scripts I would like to create a virtual lab environment on my Desktop, that behaves like the ...
philipp's user avatar
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1 answer
498 views

VMware ESXi 7.0 U3j Can't login via root after a few minutes

I can't login via root user at the moment . If I do a hardware reboot on the server , the problem is solved and I can login for just once before I'm locked out again after like 5 minutes . I have read ...
Prestige VPS's user avatar
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0 answers
96 views

Can't connect to MariaDB from internal VM Structure

S1 Virtual Machine 1: Ubuntu app server Virtual Machine 2: MariaDB 1 S2 Virtual Machine 3: Ubuntu app server Virtual Machine 4: MariaDB 2 from vm04 and 03 I can connect to DB1 with connection string ...
gegentierversuche's user avatar
1 vote
0 answers
70 views

Open/rescue large vmdk files with little ram and HDD memory

I have a vmdk file (approx. 800 GB), it contains many large media files. Unfortunately, the ESXI VM is filled to the last bit. The attempt of a subsequent enlargement was already some years ago, so ...
Huskynarr's user avatar
5 votes
1 answer
609 views

Linux immutable backup repository deployment architecture best practice?

What are the Linux distributions that are compatible with the Immutable repository? Can you give me some advice on the best hardware or virtual machine configurations to deploy a large backup ...
Senior Systems Engineer's user avatar
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0 answers
85 views

Prevent vfio from loading for ethernet and wifi devices when using it for GPU

00:1f.4 SMBus [0c05]: Intel Corporation Comet Lake PCH-V SMBus Host Controller [8086:a3a3] DeviceName: Onboard - Other Subsystem: Micro-Star International Co., Ltd. [MSI] Comet Lake PCH-V ...
Mehdi's user avatar
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Do i need vCenter Server for vGPU?

i have been digging around every corner of the internet and spoken to both vmware (who only spoke enough to tell me they can't talk to me) and dell, but i can't find the answer to a simple question: ...
jwsl224's user avatar
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0 answers
58 views

How to convert virtual machine images to bootable OS installation?

I have a virtual machine installed in QEMU. I want to migrate this machine and use it as base machine. Query I have is that it is possible, and if yes will simple converting .img to .iso and burning ...
Ayush Gupta's user avatar
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0 answers
37 views

ZFS Not Recovering Space

I've certainly made a few rookie mistakes when setting up my first ZFS from a 4 drive array (14tb platters), mainly forgetting to change the block size from default. However I am missing space in my ...
jjonesdesign's user avatar
2 votes
1 answer
138 views

Is it possible to install and use Dokku on a server that already has Apache2 configured with VirtualHosts running?

Posted this on StackOverflow, but realized it probably belongs here: I have a Ubuntu (now upgrading it to 22.04) server that runs several virtual hosts with php applications. I'd like to run a couple ...
simonelippolis's user avatar

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