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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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20 views

I want to build a virtual web server from python. Where do I start?

I use Python, and I'm familiar with its capabilities and syntax. I want to create a web server that can receive and send JSON data packets. Sorry about the short question.
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KVM Virtual Machine Network - Guest-guest/VM-VM only network (no host/hypervisor access, no outbound connectivity)

I know that with the virsh command I can create several types of networks (a "NAT network", for example) as we can see in these URLs... KVM network management KVM default NAT-based ...
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How to connect to Qemu from ssh

I run a Qemu file (debian 10 server) with network configuration in static in 192.168.10.7 on my My, I can start my qemu everything works I can connect on my server. But now I would like to coonect to ...
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Middle sized company server architecture

I am designing server for middle sized company which should offer services as accountancy software, property record software, file server etc. My idea is using Hyper V server as type 1 hypervisor. As ...
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Can ssh into Ubuntu 20.04 virtual machine but domifaddr shows no IP

I created an Ubuntu 20.04 virtual machine following this guide. I am able to ssh into the virtual machine using the IP address I wrote in the network-config file, i.e., 192.168.122.101, however, when ...
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Ubuntu 20.04 cloud image can't get IP address

When using virt-install to create a guest, CentOS 7.9 cloud image successfully gets an IP address, which can be checked with sudo virsh domifaddr <domain>. However, Ubuntu 20.04 LTS cloud image ...
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How can I optimize ksm for my machine - 100% CPU usage and limited KSM Sharing (Proxmox)

Proxmox Node Stats KSM is constantly at 100% CPU usage which makes me believe I need to optimize the /etc/ksmtuned.conf configuration but I am not exactly sure what to set it as for this machine. As ...
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1answer
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Hetzner Vlan connectivity between VMs inside dedicated server connected on Vswitch

I have multiple dedicated server with hetzner and connected to one vSwitch. I can connecte the dedicated servers on vlan using vswitch. But I am struggling to connect virtual machine inside dedicated ...
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3answers
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Shared storage for KVM server cluster?

I have Dell EMC SCv3020 Storage Array and I want to create shared storage for all 3 physical servers to use the same (LVM?) for creating KVM VMs in cluster so if 1 server dies, we can move VM to ...
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1answer
50 views

ESXi 5.5 (free) to Hyper-V Black Screen-Cursor Blinking

Recently came into an environment where Free ESXi 5.5 is being used. I'm on a project to move VM's in ESXi to Hyper-V, however, I'm running into a problem regardless of what tool I use to import to ...
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Use network bridge as default network in libvirt

I created a network bridge virtbr0 with my NIC enp1s0f1. The bridge gets an ip address from the router via dhcp. i would like to use the bridge as default network in libvirt to also get ip addresses ...
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How to limit packets per unit time on a particular interface (for vms)

I am using kvm and virtuozzo virtualization on my servers and each having 10 vms. I have to restrict DDOS attack from my VMS (i.e prevent VM from doing DDOS attack), I search on net and found that I ...
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1answer
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File open/copy extremely slow after VM moved to new host

I shut down and exported a Hyper-V VM from one host and imported it to another (did it with several actually). However only my 2 VMs still on 2008 are acting really odd. They are running Server 2008, ...
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Current single system image solutions

I'm designing a cluster for a small research institute. Since our computations require a large amount of memory, I'm looking for a solution that will allow our applications access to the whole memory ...
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1answer
52 views

LXD Container IPv4 Interface Management

Ubuntu 18.04.4 lxd 3.0.3 lxc 3.0.3 I have had several containers running without issue for a long time. Today I was making changes to my network and one of the containers picked up a DHCP address. ...
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2answers
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HOW : single VHD shared between 2 different VMs

I need to share single VHDX with 1 large partition containing no OS, just plain files (mainly pictures) and promote it to 2 different VMs with 2different OS at 1time : VM Windows with stock keeping ...
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Low rate with tc htb in Ubuntu Guest VM with Ubuntu Host

I am using tc htb to shape multiple flows with a total bandwidth constraint, but stuck in some low rate issue related to the system or virtualization. The script is here: BURST=1600 # 1600b by ...
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Best practice for configuring a complex virtual network with multple links and multiple virtual machines

I have a somewhat complex virtual network setup with multiple virtual machines and the links between them. There are perhaps 40 ip commands to set it up which (if I read the docs correctly) need to be ...
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kvm virtualization, slow io in windows guest (with virtio drivers) on ubuntu host and HP 360 Server with P440 RAID controller

Problem: Very slow IO in Windows Guest vs Host Hardware: HP 360 G9, 2 x 10 cores Xeon CPU, 128GB Ram, 4 x 4TB SAS HDD, Raid 10, P440 Controller (with 2GB cache and battery) Host: Ubuntu 20.04 Server, ...
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Can I setup KVM Hypervisor on Soft Raid?

I'm running several virtual private servers as well as quite a few dedicated machines. I'm wanting to cut costs by setting up a dedicated server to run enough virtual servers to meet my requirements. ...
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1answer
100 views

Forward ssh connection to Android devices

In my lab I want to set up a ssh jump host that forwards incoming ssh connections to Android devices that are connected to it via USB. All Android devices have USB-tethering turned on. The tethering ...
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1answer
65 views

Why would Google be throwing away emails from virtual domains to virtual domains? postfix

I'm seeing some odd behavior and am hoping someone has seen this as well. I have a CentOS server running Postfix for virtual domains for my businesses. It was working well for years and then suddenly ...
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KVM hosts to be accessible from outside world for server purpose In centos 7

Today i just ran into a problem i just wanted to ask a question to all of you I have just install kvm in my system and i have some how managed to get a node installed and working in the system Now ...
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Feasibility of a VM/container per user deployment framework

There have been a couple instances in the past that I have been tasked with building an architecture where, we deploy one VM/container per user. This has been for reasons like: needing each user to ...
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1answer
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Is it possible to run a VM without actually enabling virtualization settings in BIOS?

I am trying to launch a VM with QEMU KVM on a Linux system but I am unable to actually make it work. It just doesn't start. But I figured out that I need to enable virtualization from BIOS settings to ...
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qemu does not give by-id symlinks for drives by UUID in linux guest

I am trying to get my drive to show up in QEMU guest virtual Linux machine. desired behavior: $ ls /dev/disk/by-id/ ata-CT1000MX500SSD4_XXXXXX Current behavior returns nothing: $ ls /dev/disk/by-id/ ...
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1answer
46 views

Solution for virtualizing a VB6 application [closed]

I posted this on stackoverflow, but probably it's more intopic here. My company, a small manifacturing industry, uses a custom ERP built in Visual Basic 6, made of a single desktop application ...
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1answer
27 views

KVM Virtualization Server - One physical disk(SSD) every virtual machine

In terms of performance, is it better to have one "big" SSD disk for several (lets say 5) virtualized guests, or a single smaller SSD disk for every virtual machine? any general draw back ...
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1answer
86 views

Raw LVM disk write is four times faster on host than inside KVM guest?

I've got a Debian 10.6 Host, with a Debian 10.6 guest. KVM/Qemu/libvirt. The host has a software RAID 10 array with 6 mechanical disks. LVM is on top of the RAID array. One LV is passed into the guest ...
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116 views

How to enable nested virtualization in order to use VirtualBox inside of a KVM virtual machine?

We have a KVM hypervisor (L0, AMD, Kernel: Linux level0kvmhypervisor 4.19.0-12-amd64 #1 SMP Debian 4.19.152-1 (2020-10-18) x86_64 GNU/Linux), which runs a virtual machine that I would like to use as a ...
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Resizing VM's size having only boot partition

I've to increase my KVM guest's partition, I followed steps as explained in the accepted answer here. For step 3, there's a link mentioned in the accepted answer comment section (tried to paste it ...
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248 views

Hetzner vswitch with public addresses using router - how to get to the internet?

I am using a Hetzner vswitch with some public IP addresses and I want to use them on some virtual machines. The whole config is as described in my larger question where I say that it feels like data ...
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0answers
55 views

VLAN tagged bridge to virtual machine - seeing network chatter but ssh/ping don't work

I have a VLAN-tagged network going through a bridge to a virtual machine, and I can see network traffic on the virtual machine using tcpump, I can't ping or SSH it. I run tcpdump -n -e -i br4003 host ...
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0answers
150 views

HyperV Error: “The server encountered an error trying to create the Virtual Hard Disk”

I'm currently trying to convert my Physical Ubuntu 20.04 Server to a Virtual HyperV Ubuntu Server. As such, I am trying to convert my physical Ubuntu 20.04 hard drive into a virtual hard disk. I'm ...
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How to install xenserver on HP Proliant DL360p gen8 server using iLo?

There is a clean HP Proliant DL360p gen8 server. The task is to install xenServer. When trying to install after choosing a language, an error appears "No network Interfaces: This host does not ...
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0answers
63 views

KVM DNS forwarding not working / reply: REFUSED

I've set up a couple of VMs for development purposes for a project. The setup includes a local CA for the past, current and future project VMs. On the guest if can do dig staging.testing.lan and get ...
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0answers
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Openshift Route - Cookie specification - Istio Routing

I have requirement to pass cookie or headers in openshift route to istio virtual service and decide the traffic routing based on cookie or header passed from route to virtualservice. Please share ...
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0answers
38 views

How to change Libvirt Job type from 'Cancelled' to 'None'?

After I abort a live migrate, the Job type has changed to 'Cancelled', which makes me unable to migrate again. So,If some libvirt api (or QMP) can help me to change the Job type from 'Cancelled' to '...
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0answers
25 views

Non-obvious restrictions in virtual servers

I apologize in advance for a beginner question. What attributes should I check for besides the obvious CPU, RAM, storage and bandwith parameters when ordering a virtual server? Two settings which have ...
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1answer
63 views

Where is virsh save directory location defined

The default location of the virsh save myVm goes into /var/lib/something which makes my slash partition full on a Vm save, which is really anoying. I could not figure out where is the virsh save myVm ...
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1answer
381 views

How to get OS version of proxmox server over command line (cli)?

How do I check what version of Proxmox my server is running? Wikipedia tells me that Proxmox runs on a modified version of Ubuntu LTS It is a Debian-based Linux distribution with a modified Ubuntu ...
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1answer
60 views

Recommended values for mon osd down out in ceph

Are there any recommended values for "mon osd down out"? The cluster has 15 nodes and 300 osds. It's running ceph Jewl. The default value in Jewel is 300 seconds. I was wondering, are there ...
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1answer
113 views

What is the perfect tomcat virtualization config file?

I am managing tomcat server behind the nginx. In tomcat multiple webapps are there. My OS is Ubuntu 18.04LTS on Digital Ocean. Everything working fine, but suddenly I have one issue popped up. Tomcat ...
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0answers
38 views

Proxy error in server log

I’m running a React frontend on website.com, a second frontend on app.website.com, and a Node back-end on website.com:8080. Errors in server logs I have two errors in my server logs that show up quite ...
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1answer
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Windows Virtual Desktops - Doubts

I am looking for some solutions to avoid buying laptops and one that I found is: Windows Virtual Desktop. I used azure calculator for: Windows Virtual Desktop Region East US 2 Type Pooled 100 named ...
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0answers
142 views

ASMB8-IKVM firmware update

I'm trying update firmware that there is 1.08 to more recent, I look in site official but not gotch result, all versions are defined with "unsuccessful" in verifying the firmware image ...
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1answer
34 views

Workstation virtualization on workstation host

Problem exposition I am a system administrator in our company, and I am currently researching a possible solution for more stable workflow in a our company. Our company is a chain of hundreds general ...
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0answers
21 views

Multiple inexperienced users on one Linux server. How best to use containers to protect against unintentional damage?

So, I'm a researcher tasked with maintaining a number of GPU servers for researchers in my lab. I have quite a bit of Linux experience, while some users have never used Linux before. The other ...
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4answers
120 views

Is a loopback interface just another term for virtual interface?

I've been reading through many forums and many questions here on loopback interfaces and a point that is constantly iterated is that a loopback interface is a virtual interface. In hypervisors like ...
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3answers
852 views

ESXi 7.X file permissions - how to buypass new security measures

Today i installed a new ESX 7.0 Hypervisor machine. My initial goal was to get some RAID status reporting. I created a python script that i wantet to run from a crontab job. This due to the fact that ...

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