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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High CPU% stolen on EC2 instance at extremely regular intervals

I have a m1.small EC2 instance on AWS running some websites. I noticed my CPU usage have peaks at regular interval of times, exactly every 30 minutes (0:06, 0:36, 1:06, ...). I've checked my crons (I ...
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Setting up mongodb via upstart - how to pass options?

I installed MongoDB in an Ubuntu Server VM inside VMware using these instructions: http://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/. Everything works fine, and I can access MongoDB ...
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how to drop_caches in OpenVZ centos6 container

I have tried sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches' sudo echo 3 > /proc/sys/vm/drop_caches echo 3 > /proc/sys/vm/drop_caches echo 3 | sudo tee /proc/sys/vm/drop_caches and a ...
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Will the OS crash if the system partition can't be access for a short period?

An operating system is installed in a virtual machine environment, such as VMWare or KVM. A network shared disk volume (e.g., iSCSI disk) is used as the OS system partition. Heavy traffic is running ...
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netkit: why cant my router 4 pc4 ping my router 1 pc1 - how can I solve this please?

Below I have four routers connected but my pc1 on r1 cannot ping my pc4 on r4 and also my pc2 on r2 cant ping my pc4 on r4 and vice versa. Below is a network diagram: and the configurations are below ...
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5answers
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unable to rename linux hostname?

I got one problem with my linux webserver where I deployed from Virtual Machine template, usually i go to the console and then issue the command hostname NEWSERVERNAME to make it happens and then ...
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2answers
238 views

Is the # of CPUs on a virtual machine always meaningful?

On a virtual machine, if cat /proc/cpuinfo tells me that there are 4 CPUs, is this just as meaningful as if it were bare metal? Should I configure my server (for example, # of Nginx or Apache workers) ...
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293 views

Why is the total size of my files on Windows 7 more than total disk size?

I have a virtual machine with Windows 7 x64 quest OS. When I boot from PE OS CD and run file manager (Total Commander) I see that the total size of my files on virtual machine is more than total disk ...
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How to free up /var/lib/mysql (virtualbox vm)

I imported big dump into mysql and filled up my whole space (dumb me). Machine that's mysql server is virtualbox virtual machine. It's using automatically expanding virtual hard drive. I freed up few ...
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Xen - can't create domain because 'vdb could not be connected'

I'm trying to start up a Xen VM, however I'm getting the following error: Error: Device 2049 (vbd) could not be connected. Hotplug scripts not working. what does this mean? The dom0 is CentOS and ...
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How to create a single image of Windows Server 2008 R2 to use on a Azure Virtual machine

I am trying to migrate from a colocation where I own the servers to Azure. I have been following this article: ...
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New Azure VMs on virtual network have no connectivity to anything

A couple of days ago, I created a cloud-only Azure virtual network (no cross-premises connectivity), provisioned a domain controller/DNS server inside of it, and configured both my DNS server and the ...
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237 views

reached the maximum partitions on my virtual machine

I have a virtual machine and I extended the size since I needed more space. Here is what I have and the message I am getting: I was reading up and I saw some references to diskpart.exe and it gave ...
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2answers
647 views

Why VM cannot get the public IP I have from provider?

I have a KVM-Host (on Debian) with root@kvm-host:/# cat /etc/network/interfaces auto eth0 iface eth0 inet manual auto vmbr0 iface vmbr0 inet static address 176.x.y.133 netmask 255.255.255.224 ...
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312 views

What are the differences in the configuration of the network on Proxmox (KVM)?

I have a dedicated server, one main public IP from /27 and two single public IPs also from the same /27 (I think the provider manages single IPs using the VLAN tags). I want to have a KVM running on ...
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496 views

How can I connect two virtual machines in vSphere ESXi 4.1?

There is documentation available for version 5 (I am running 4.1 per the title), but following the directions raises the error: Incompatible device backing specified for device '0'. upon ...
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VMWare ESX installation on sata disk

I have a PC with Gigabyte H77 motherboard with Intel I5-3550 CPU 8 GB RAM 1600MHz and a 500GB Harddisk (7200RPM) - WD Sata III disk I wish to install esx on it and run some virtual machines on it. ...
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496 views

Which hardware to VM ratio for Build-Server virtualization?

After a few comments and answers and thinking, I hope I can now add a TL;DR : If I want full performance(a) and (simple) HW failure redundancy, does it make any sense to go for a virtualization ...
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Cannot delete unresponsive machine on VMWare Infrastructure Web Access on Windows 2003 host

I have some Windows virtual machines running on VMware on a Windows 2003 host, and I administer them via the Infrastructure web access. I recently added a CentOS Linux machine as well and it was ...
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272 views

netkit: Connecting 3 routers and trying to ping router 3 to router 1

hey guys, I am using Netkit to simulate a network, I am using the static routing lab provided by Netkit and I am trying to set up 3 routers. I have 3 routers each with a pc connected. pc1 on r1 can ...
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5answers
477 views

Help Me Spec A Server for MAX VMs Reasonable Cost

I am planning on building servers to host the max number of VMs. Right now I have seperate machines running some applications, datamining type stuff and they each have about 1gig ram, 600-1GHz CPU and ...
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231 views

Why does my Fedora HD come up as 124GB when it was created to be 700GB in Hyper-V?

Any ideas? How can I tell fedora to use 700GB, and do I have reformat to do this? Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_computer-lv_root 124G ...
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When I have a Windows VM, how do I upload my website to it? [closed]

This is a really stupid question, I know, but I have literally zero experience on setting up a website/web app from the server level - I've always used a third party like Arvixe or GoDaddy. So, I ...
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1answer
121 views

Where can I learn fundamentals about hypervisors in context of other hardware virtualization solutions? [closed]

I am interested in learning more about hardware virtualization, with a specific focus on hypervisors. I am competent to manage a server and would be able to configure an environment to work using ...
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2answers
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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 ...