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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1answer
44 views

How could I give KVM more hard disk space [closed]

I want to use kvm as virtualisation software, but it is difficult. Is says that I dont have space on the node, that is not true. How could I solve this big problem? http://prntscr.com/2rlcq1
1
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1answer
296 views

KVM virtual machine boot messages

Just wondering if anyone knows of a way to stop the following boot messages with a centos 6.5 vm created with qemu-kvm When I start the vm there is a slight delay as the vm posts the following boot ...
1
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1answer
110 views

exactly 90 seconds to restart apache httpd

I have an openSUSE 13.1 VM (host runs Virtualbox 4.2.18, also on openSUSE 13.1) and restarting httpd (Apache/2.4.6) always takes 1.5 minute: foobar:~ # time /etc/init.d/apache2 restart redirecting to ...
1
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2answers
22 views

Virtual machine hosting with priority

The simplified problem: I have 3 servers on which I want to host virtual machines. Some VMs are more important than others. Should I keep the important ones on a "high priority" server and the ...
0
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0answers
253 views

Windows 8 Hangs at first login ( domain account )

Good morining, i'm experiencing a systematic problem with new fresh joined to domain Virtual Machines with windows 8 and windows 8.1 installed operating system. The issue is that at first login the ...
0
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2answers
90 views

Microservers VS Virtual Servers

I am reading this articles in regard to microservers : 10 things you should know about microserver Microservers : What you need to know It seems to conclude that micoservers are best tailored ...
1
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3answers
371 views

Why aren't Azure Linux VM's keeping time sync with host?

Using Ubuntu 12.04 VM's built last year on Azure. They only seem to get proper time on boot, and drift about a second a day. Is this a normal issue for Azure VM's? I know VM time drift is normal but ...
1
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1answer
116 views

Does 'lvremove' destroy data?

I assign a LV for each vm guest. When deleting a vm, I remove the corresponding lv running 'lvremove'. But is it necessary to destroy the data before running 'lvremove'? Does lvremove do the work of ...
1
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1answer
51 views

How should I prepare a Linux virtual machine for others?

I'd like to share a VirtualBox virtual machine with a colleague, but would like to make sure this is tidied up before sending it on. I guess I should include: SSH host keys DHCP leases files under ...
1
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0answers
102 views

PHP scripts on live Apache servers consume more memory?

Lately, I've been spending time trying to optimise PHP code. I develop on localhost inside a VM and have been putting the memory_get_usage() at the end of scripts to help do this. The localhost uses ...
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1answer
155 views

Forwarding incoming ssh connections to virtual machine based on LDAP group

My Question is as follows: How can I forward all incoming SSH (Port 22) traffic (except one account) to a VM which is running on this server? The Server is based on Proxmox VE 3.1 The VM is Debian 7 ...
0
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1answer
205 views

assign public IPs to vm guests

I have a set of public IPs for virtual machines. Each unique public IP is to be assigned to a unique guest. With bridged networking I share eth0 with KVM machines. The ifcfg-eth0 file has ...
1
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3answers
844 views

Virtual Machines List from PowerShell vs PowerShell ISE and PowerGUI

I am confused to why I have different information based on where I try to retrieve it from. I have 3 Windows 2012 servers (G0, G1, and G2) running Hyper-V. The following situation is captured from one ...
2
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1answer
484 views

Azure Linux VM Captured, Built from image. Different password or key for new VM: permission denied?

I followed How to Capture an Image of a Virtual Machine Running Linux to capture a VM image, after installing the packages I wanted on top of Ubuntu 12.04 LTS. I turned off the machine following a ...
1
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1answer
638 views

Restore a VM to latest snapshot automatically on power on?

In vSphere 5.1.0 I have created a snapshot of a windows 7 machine. I would to restore the machine to this snapshot each time its restarted. But it only seems to be possible if I manually go to the ...
1
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0answers
30 views

Where do you store shared secrets used in building VMs dynamically (phoenix servers)?

We use vagrant to spin up linux VMs for dev, testing, and evaluation servers for our software. Most often, devs are using linux from VMs inside an AD-connected windows7 box. The configuration of the ...
0
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0answers
193 views

Virtual machine can't be reached via SNMP… Is it even possible?

I'm monitoring my work network via SNMP. Now, I have a virtual machine working as a DNS server so that I can access to them using hostnames (I'm using observium in another virtual machine, by the ...
0
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2answers
296 views

SSH to VM rejecting password, works from virt-manager console

First of all, I'm sorry if there is a duplicate post somewhere. I searched for a while but none of the posts I found fixed my problem. It's fairly annoying. I created a new VM on our network and when ...
0
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2answers
160 views

iptables causes infinite loop of GET request

I am trying to reroute HTTP traffic from 80 to 8080 to be used by Burp Suite. Using iptables, my command was: iptables -t nat -A OUTPUT -p tcp --dport 80 -j DNAT --to 127.0.0.1:8080 By doing so, ...
0
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1answer
38 views

Virtual Routing for root virtual machines on 1 IP

I wan't to install several (around 10) virtual machines on our server. We have 1 public IP-address assigned to it. I wan't to use virtualbox (and phpvirtualbox for administration). I have no control ...
2
votes
1answer
270 views

XenServer Linux guest booting off iSCSI SAN (ZFS storage): Will a non-checksumming guest file system still be at risk?

We are storing files on FreeNAS 9.2 using ZFS. I love the data integrity claims made by ZFS, having randomly lost data in the past on servers using ext3, XFS, and ReiserFS that were not mistreated ...
1
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0answers
413 views

Can't connect to proftpd from outside the virtual machine

This is related to a previous question. I have a machine with Windows 7 acting as a server and it hosts several virtual machines. One of them, a Debian Squeezy is acting as a PostgreSQL server and I ...
0
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1answer
567 views

Resolving External DNS from Azure Virtual Network

I've set up a virtual network in Windows Azure to host two Linux VMs (Centos / OpenLogic). I've registered a local DNS (local as in the cloud, not my personal network) inside the virtual network. I ...
1
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2answers
171 views

KVM Network configuration + VLAN trunck

I am trying to set up a KVM Based solution, I am having trouble configuring the NICs for the VMs from a bridge based on a VLAN interface. My config below : ETH0 : KVM Host Management : ...
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1answer
99 views

Very Slow SQL Performance on VM rinning 2003 through 2012 r2 host [closed]

I have an OLD HP proliant ML350 used as HYBERv Host (win server 2012 - 16 GB RAM , 3x146 GB SAS , one processor). i have a VM (win-server 2003 32bit + sql server 2000) , every thing is working fine ...
0
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1answer
164 views

puppet gitlab postgresql conflict

I#m trying to setup a VM with postgresql and gitlab. I'm using the following packages: gitlab & postgresql This is my init.pp class { 'postgresql::server': ip_mask_deny_postgres_user => ...
2
votes
3answers
2k views

Can I add a second network adapter to my Azure VM?

I have Multiple VM's on Windows Azure. Default, they come with 1 network adapter and you can only assign 1 virtual network (Availability Set) My question is : possible to connect 1 VM to more then 1 ...
2
votes
1answer
532 views

How can I use perfmon/logman to set up logging on a master (Windows) VM, writing to another machine on the network?

I know how to set up logging to write to a remote location in the general case - just specify the output filename using the full UNC path (e.g. \\HOST-PC\directory\logoutput.etl) when creating the log ...
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2answers
89 views

Why am I only able to connect to my server when generating traffic from it? [SOLVED]

UPDATE - Because of the infrastructure changes from the acquisition, there was an IP address conflict. Once that was identified, the behavior stopped, as traffic could consistently be routed to the ...
2
votes
3answers
2k views

kernel warning in logs: set_rtc_mmss can't update from 0 to 58

I've been seeing a bunch of these log messages Jan 3 00: 58: 57 foo kernel: set_rtc_mmss: can't update from 0 to 58 They occur on CentOS 6.4 VMs running on VMware. I understand it's something to ...
5
votes
1answer
547 views

linux OOM-kill why?

. Greetings, fellow admins. I post in the hope of shedding light on the OOM-kills that haunt one of my company's machines. I cannot decide if they are legit OOMs or not. It's a Centos 6.x with kernel ...
0
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1answer
103 views

Correct way to copy vm disk

I have a VM’s disk to copy from one host to another for live migration. I can think of two ways to copy the VM’s disk. Do a snapshot of the Logical Volume in the original host, create a Logical ...
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votes
1answer
108 views

Different subnet range of ips are not working - windows server 2012 - virtual machine [closed]

ip , subnet , default gateway The main server is windows server 2012 and main ip is : 198.245.73.82 , 255.255.255.248 , 198.245.73.81 Now i have originally allocated ip range from my server ...
0
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1answer
113 views

No IIS Manager on Windows Server 2012 Essentials

I just got Windows Server 2012 Essentials installed on a VM and I would like to set up some web projects in IIS on this VM. But I can't seem to find how to get to it? When I remote to the machine with ...
2
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2answers
53 views

Azure : VM interference

In Azure, VMs from different services might be co located on the same physical host. Is there any possibility that one might interfere to the other? In other words, is there a guarantee for isolation ...
1
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1answer
1k views

How can I move the data files for a VM to another location?

We have a cluster of 3 x 2008 R2 physical hosts running Hyper-V. How do I safely move the VHD(s) and accompanying XML files, etc, for a specific VM to a new location? I want to keep the VM with the ...
0
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1answer
101 views

Strato VM stops connecting via SSH after reboot

I have a virtual machine by strato. After rebooting VM can't access via ssh. Strato has a Recovery Manager which keeps the recovery sytem under /repair. How should I start to debug the issue which ...
3
votes
2answers
203 views

How can I keep important VMs in memory without disabling swap?

VM Host -> Xenon E5-2440 w/ 48G mem... Everything runs CentOS6.5 (2.6.32-431) I have 4 guest VMs running each w/ 2G of memory. Their disk images are local files. The host machine is also running a ...
1
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2answers
97 views

Guest OS provide internet access to another Guest through Host-Only adapter

I have a set-up like this: Ubuntu (Host OS) OpenWRT(Guest OS) | Damn Small Linux(Guest OS) OpenWRT is connected to Ubuntu through two interfaces, eth0 via NAT (for internet) and eth1 ...
0
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0answers
325 views

Adding existing Host to SCVMM: Error 2912

When trying to add an existing Hyper-V-Host to SCVMM I get the following error: Error (2912) An internal error has occurred trying to contact an agent on the %serverName%. (Unknown error ...
1
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1answer
359 views

What could cause an Azure VM to stop responding completely?

I have an Azure Linux VM running MySQL, which has stopped responding for the past 24 hours - ping, SSH, MySQL and everything else timeout when trying to connect to it. Yet the status shows as ...
2
votes
0answers
111 views

xenserver vm routing fails half the time on the same network

I recently switched from openstack (due to complexity) to xenserver at work, I ran into an issue that I can't solve, I can ping the server all the time but the vms part of the time. here is a ...
0
votes
2answers
409 views

Can I change the computer name of a switched off Hyper-V virtual machine without turning it on?

Here's what I see in a typical "system" log of Azure role instances for their initialization sequence (this is for Windows Server 2008 R2, I haven't checked other versions): the VM is turned on, the ...
1
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2answers
1k views

Windows Server 2012, Hyper-V and CPU Usage

The server sits on RAIDed SSD drives too. Is there a reason why the host machine seems to get more CPU over a VM in Hyper-V? The guest machine is at 100% CPU while the HOST is only at 20%. Anywa ...
4
votes
2answers
1k views

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, ...
1
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1answer
59 views

Is there any virtual machine software that would let me create a virtual machine on my local pc before uploading it to azure?

The time has come for me to configure a new windows server machine. This time though, It would be great if I could run it in a virtual machine and eventually upload the vm to some host somewhere, say, ...
0
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1answer
1k views

VMware vmx HDD boot order and CD-ROM boot order

In a VMWare .vmx file one can set a key to define the order of HDDs to try for booting, e.g.: bios.hddOrder = "scsi2:2,scsi0:1,ide1:0" This is useful when there are many possible bootable HDDs ...
1
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0answers
198 views

Сan I use IOMMU for VT-d to give each virtual machine one at a time GPU?

If I use VMWare with 4 virtual-machines and 4 GPUs (nVidia Quadro/Tesla), then can I give (move) some devices to different virtual-machines for each by a single card? If I have one of these CPU, then ...
0
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2answers
663 views

Move VMDK files to different datacenter [closed]

I am looking for a possible methods to migrate VMs from vSphere 4.1 to new vSphere 4.1. What is the best way to do this minimal downtime? I want to know how to migrate an virtualized active directory ...
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votes
1answer
52 views

We need limitted functionality like automated installation. Which virtualization is better for us? [closed]

We are about to buy a server and we want to make it as our Virtualization environment. This server will be in isolated environment and will not have direct access to production environment. We ...