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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IPv6 on Azure VM
I have an Azure VM and it works fine with IPv4
Tried to directly associate IPv6 to it, but couldn't connect to the outside world, a simple ping ipv6.google.com hung (according to Microsoft, it is ...
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How to enable SSH into an Azure Windows VM?
I need to use a Windows machine for a program that only works on Windows. I set up a Windows 10 virtual machine on Azure. On the Azure portal, at the virtual machine, under Connection, I see the ...
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dircolors: no SHELL environment variable, and no shell type option given
On interactive login I get:
dircolors: no SHELL environment variable, and no shell type option given
But I do have SHELL variable set:
% set | grep SHELL
SHELL=/bin/bash
SHELLOPTS=braceexpand:emacs:...
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Causes of RTP jitter at the server
Investigating some call quality issues (0.5 – 1 second dead spots in calls) I took a packet capture of a phone call between two extensions on the same PBX. Since I was capturing from the PBX, I was ...
6
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1
answer
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How can I increase the throughput/bandwith of my virtual network?
I have some virtual machines servers with some micro-services and do some load tests with JMeter. All the servers including the JMeter machine are sharing the same virtual network. The virtual network ...
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2
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Creating a virtual network for KVM guests spanning multiple host machines
I have 5 physical machines running Ubuntu 14.04, all of them are together in a network. These all have static IP addresses. Each of these machines has 1 to 4 virtual machines via KVM/QEMU running ...
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1
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Most VMS refuse to start [closed]
Setup: Virtual Host, running server 2012, hosting around 10 production VMs
Problem: Last night, 2 VMs stopped with no warning, event log notification, or any information. The rest of the VMs on this ...
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8
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Light Weight Virtual Machines / *nix Distributions [closed]
Does anyone maintain a list of Light Weight *nix distributions, ideally just a VM that can be downloaded.
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1
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CentOS 7 Minimal Install doesn't comes with networks scripts? Which version to use then? [closed]
I'm installing CentOS 7 as virtual machine but I'm having some problems related to network. As image shows I select Minimal Install for later add trough YUM any packages I want as for example: PHP, ...
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6
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Windows 7 x64 - free virtual machine host applications running headless
Given a machine configured with :
Windows 7 64 bit
a CPU that DOESN'T support the Intel hardware virtualization
Are there any free, non-time-sensitive virtual machine hosts that can host either 32 ...
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5
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"live" mirror of HA VM cluster?
I'm reading about HA techniques in virtualization but all solutions I see work more or less just like more specialized VRRP - when host gets down, VM is booted up on another virtualization host. If ...
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What might increase delay of ssh connection?
I have VMware Workstation and after some time I started to notice, that after inserting username ( during ssh connection ) it takes longer and longer to prompt for password. I installed Ubuntu Server ...
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1
answer
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What is the difference between "turn off" and "shut down" in Windows 7 version of Virtual PC?
In Virtual PC (on Windows 7) what is the difference between choosing Shut Down vs. Turn Off?
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Renting Virtual Machines for testing [closed]
I am looking for renting virtual machines for testing my desktop software. In particular, I am interested in all modern Windows client versions (XP no SP, SP1, SP2, SP3, Vista with/without SP1/2, ...
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Windows Virtual PC and VirtualBox on the same PC
I am running Windows 7 Professional x64. Presently I am using Windows Virtual PC. I'd like to try VirtualBox. Can both virtualization platforms be installed and run on the same instance of Windows? ...
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Deploying virtual machines - Windows Guest/Linux Host or vice versa?
I'm looking to deploy several virtual machines for users. They need access to both Windows and Linux.
They also need to use the computers graphics card (for Photoshop, modeling, etc) under Windows.
...
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5
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What should be considered when purchasing a virtual machine set up?
I've been asked for an opinion about a purchase of a blade server that should be used for running virtual machines. I have very little experience in this, so what things should be considered in terms ...
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1
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Proxmox. ERROR: Backup of VM failed - CT is locked (backup)
I tried to create backup of the container (LXC) in my Proxmox and I get the error:
INFO: starting new backup job: vzdump 206 --node my_server --mode snapshot --storage backups-stor --remove 0 --...
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3
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Automating virtual machine creation across multiple hypervisor platforms
Is anyone aware of a tool for automating the creation and deployment of virtual machines across different hypervisor platforms? I work on web applications running on EC2, Xen, KVM, and VMWare, and I'm ...
5
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1
answer
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How to change a VM from split across multiple .vmdk files to a single one or two?
I have a VM with 3 partitions. One main one, one for swap space, one for storage. However, there are dozens of .vmdk files. Some of those .vmdk files are very large (over 1 GB), but the majority ...
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4
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Disable Time Synchronization on Ubuntu
I am setting up a development environment with Ubuntu in a virtual machine. The date in the VM must be in 2009 due to some silly timebombing issues, so I want to disable any automatic time ...
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4
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Start Windows in virtual machine from real hard drive partion
Is there any virtual machine under Linux which can start Windows (XP) from real hard drive partition, not from emulation image?
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esxi vmdk out of disk space
One of our highly utilized vm is giving the error that there is no more space for the the vmdk shown in the following image.
The VM won't start because of this issue, so I'm not able to delete data ...
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2
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How to setup multiple VPS or virtual machines on a VPS hosting account? [closed]
Let's say you have a Linux VPS hosting account and you wanted to add several VPS's inside that VPS or virtual machines, how can you do this?
A scenario could be that I wanted to install an IIS server ...
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4
answers
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Unable to ping between host machines and guest vms running on Vmware
In order to learn a bit about system administration, I've installed a Centos vm using Vmware on my local machine running Windows 7. Everything seems to be working fine since I can access the internet ...
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2
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Cheap server platform with support for >12 GB RAM [closed]
I'm looking for the currently best (as in value for the money) cpu/chip/motherboard combo to build affordable application servers that support a lot of RAM (at least 12 GB; better more). As I want to ...
5
votes
1
answer
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With a vsan issue where you cant access vcenter, should you ssh into all machines and power them down prior to restarting esxi host?
So I have a vsan cluster, 4 esxi hosts all contributing to vsan as well as compute. Vcenter lives in esxi01. Esxi01 is not responding and I cannot open the web gui.
I can still ping every vm and ssh ...
5
votes
1
answer
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VMware disk usage and thin provisioning: numbers don't add up?
I'm trying to make sense of the (thin provisioned) disk space on VMware ESXi 4.1 (using vSphere Client). The numbers I see don't add up and don't make sense.
Looking at the machine properties for an ...
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5
answers
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Web-Based Virtual Machine Manager
I am looking for a web-based virtual machine manager, which will work on our Ubuntu server.
Ideally, I need something that our team can use to create a VM, test builds and packaging and then either ...
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4
answers
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How do the Hyper-V machines get identical IPs even the physical machine has only 1 Network interface?
In windows 2008 we can have multiple Hyper-V instances on the same physical machine. Generally that machine has only 1 network interface. (I assume 1 card with 1 MAC Address). Then how do the Hyper-V ...
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2
answers
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Looking for way to expose and extend 100s of USB connections from VM cluster(s)
We currently test a very large number of devices and we have one PC per 10 devices or so (we use two USB hubs per PC to break out to the devices). We have huge number of PCs and it's turning into a ...
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2
answers
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How to get public IPs on ESXi VMs?
We have a dedicated server with a hosting provider. We are running ESXi 6.0. The server has a single public IP which is currently being used for the management interface. The provider has also ...
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3
answers
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XenServer Performance
we've got 2 x HP DL360 G5s with Quad Quad Xeons 2.6GHz and 32GB of memory each running XenServer 5.5 and they access an OpenFiler box (with 8 x 320GB SAS 10K drives) via copper CAT5 (1GB) for the ...
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2
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Windows Server 2012 Cannot Read Disk As Guest OS In ESXI
I'm running into a frustrating issue with Windows Server 2012 and VMWare ESXI.
I'm running ESXI version 6.5 (old I know, but this is not the issue) with a VM running Windows Server 2012. On this VM, I ...
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2
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avoid redundant writing of virus scan signatures in VMs on same disk [closed]
I have two VMs on the same disk that each have clamav installed. Both regularly run updates for the same virus scan signatures
simultaneously which results in an unnecessary strain on the performance ...
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2
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SSH painfully slow on my local network?
I have a CentOS 6-x64 Server running through VirtualBox on Windows Server 2012R2, but whenever I SSH into it, it's painfully slow. This happens for both Putty on Windows, and SSH on OS X. I've read ...
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Configuring RAID on a VM Host for best performance of multiple Virtual Machines
What is the best way to configure disks in a VMWare server that will be hosting multiple machines?
A single RAID 5 array hosting multiple VMs would provide good throughput but means all VMs are ...
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4
answers
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Hyper V - Read Only VM
We have a couple of test VMs which we use to test software on. We would like to have a virtual machine revert back to a saved state everytime the VM restarts.
I believe virtualbox calls this feature ...
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votes
3
answers
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Clock synchronisation on kvm guests
I'm having trouble keeping the system clocks sync'd on a number of kvm guests. I've googled a fair bit, and found a lot of different options, many of which I've tried, to no avail. So here I am.
ntpd ...
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6
answers
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Google Cloud Services - unable to SSH into instance at all
I am unable to SSH into my instance on the Google Cloud Services.
I am not very well versed in VM management and troubleshooting, but have tried everything I knew, and google could provide to me ...
5
votes
1
answer
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Last powered off date for a vm in Hyper-V 2016
In Hyper-V 2012 when we had the configuration of a vm in the xml format, one could look up the last_powered_off_time node in the vm's configuration .xml file:
<last_powered_off_time type="integer"&...
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1
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How can I stop Azure from randomly replacing network cards on VMs?
Azure seems to have the habit of randomly changing the hardware configuration of virtual machines, without telling anything to the user.
This is of course mentioned in the documentation, although ...
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1
answer
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Configuration Defaults for VMWare vSphere Virtual Machines
We have a number of hosts running VMWare ESXi 5.5 all attached to a vCenter instance. We access and manage all of our VMs with the vSphere Web Client.
A number of people who do not necessarily have ...
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1
answer
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Should APIC be used on VMs?
I'm provisioning some VMware and Virtualbox VMs, both 32 and 64 bit and all my boot commands start with /install/vmlinuz noapic.
Searching for information about APIC etc. around the web doesn't give ...
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3
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Linux Kernel Virtual Machines
I've been running KVM for a few of the management servers at work, I've actually been very happy with it all around, and now want to move to the next phase, and deploy some heavy services (data-mining,...
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1
answer
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How do I copy/paste to a VM console window in the VMware ESXi HTML interface?
I have an Ubuntu VM in an instance of VMware ESXi 6.7.0. I am using Chrome to access the VM console in the HTML interface of VMware ESXi. (I do not have SSH access to the VM.)
I would like to copy/...
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2
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NFS Performance issues on Oracle Linux 6.7: Shared libraries on NFS slow down system
I am currently hunting down some performance issues on some VMWare virtual machines with the same amount of memory and cpus, running Oracle Linux 6.6 (Kernel 2.6) and 6.7 (Kernel 3.8). The machines ...
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1
answer
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VM-VM only network with KVM
I'm trying to create a VM only network where guests can speak to each other, but not with the host. I want to isolate the host for security reasons, as multiple test users will be using the VMs.
...
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2
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Proper Hyper-V Network Configuration for Windows Server 2012?
We just put our first Hyper-V based web solution online about a month ago (Diagram below). We're having intermittent communication issues between Virtual Machines during periods of elevated traffic, ...
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3
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Unable to ping VirtualBox guest with Bridged Networking
I'm running VirtualBox 4.2 on Windows Server 2003 and I am trying to ping the IP address of the guest virtual machine from the Windows host (ICMP is not being blocked).
The guest is 192.168.0.1 and ...