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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Shrinking Linux Partition and VM's

I have a Centos 6.2 x86_64 Virtual machine running on an EXSi 5.1 Server. It currently use 320GB of space which is way too much space and need to be shrunk to about 80GB. What I need to do is reduce ...
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201 views

Iptables configure gateway virtual machine with 2 interfaces

I have a virtual machine that works like a gateway from other virtual machines. The configuration of the interfaces is the following UBUNTU: eth0: ip: 10.0.2.2 netmask 255.255.255.255 ...
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31 views

EFI virtual machine on Hyper-V

Is it possible to create EFI virtual machine running on Hyper-V? Which Hyper-V version should I use?
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76 views

How can I quickly relocate an entire virtual machine to a new location?

We are using Hyper-V in a clustered Server 2008 R2 environment with 3 identical hosts. Virtual machines are stored on cluster shared volumes (CSV's) on a SAN backend connected via iSCSI. What is the ...
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1answer
296 views

How to stop time synchronization on an Azure VM

I'm trying to simulate a different date/time on an Azure VM but the time keeps resetting itself to the current date/time. Is there a way to force the server to stay at a specific date/time until I ...
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2answers
717 views

vSphere - Allocate 100% CPU to 1 VM / 88% efficiency [closed]

EDIT 2: My application benefits from hyper-threading A. Yes I know what the technology is and what it does B. Yes I know the difference between a physical core and a logical one C. Yes turning HT ...
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1answer
217 views

vmware vsphere clone vm

this is my first time cloning a vm ubuntu 12.04 production server on a mvware esx enviroment. Thus I´m a bit scared of lose sight of something. The Server is nothing more than a webserver apache + ...
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1answer
81 views

Azure VM - Block traffic to port if coming from outside the datacenter

I have a group of VM in windows azure that provide a backend service (elasticsearch) to a web application (also hosted on azure). What we want to do is to block any request to port 9200 that comes ...
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1answer
55 views

Is the ethx mac address of a VM the same as the mac address of the corresponding tap interface?

I have a single node openstack install on an ubuntu machine. For some reason that I cannot figure out, the linuxbridge is dropping packets from this VM. My iptables seem to be fine (atleast as far as ...
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1answer
229 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 ...
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134 views

XenServer API - free memory incorrect

I am trying to get server info from a VM using the Citrix XenServer API, and the XAPI RRDs. The API itself returns some semi-useful data like last boot time etc, but I'm really after available memory ...
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1answer
416 views

How to direct connect two virtual machine's NICs on vmware player?

I have two virtual machine on vmware player both, each have a NIC card. I want to direct connect VM1's NIC to VM2's NIC, not bridge, not NAT, not Host-only, just direct connect like connect through ...
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66 views

CentOS 6 network failling to connect network after exporting VM from VirtualBox to VMWare Player

I have installed a CentOS 6 virtual machine in VirtualBox and I want to export it and use it under VMWare. But after exporting, network does not work. There are some other interfaces created with the ...
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2answers
378 views

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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1answer
95 views

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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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
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1answer
96 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 ...
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4answers
862 views

Is it possible, and is it advisable, to host a mail server on a Windows Azure VM role?

I know this question has been asked on various forums before, and that all the answer were negative, but many of the answers are quite old, and with Azure developing so quickly it seems useful to ask ...
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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 ...
2
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1answer
373 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 ...
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0answers
234 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 ...
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2answers
78 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 ...
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1answer
102 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 ...
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1answer
116 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 ...
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2answers
1k views

How can I restore VM on a new Hyper-V server?

I was working gladly with my VM on my local Hyper-V server. But, after installing some updates on the host the system only show the famous blue screen. I couldn't start my host so I reinstalled it and ...
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1answer
45 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 ...
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0answers
75 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
164 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 ...
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1answer
448 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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1answer
452 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 ...
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1answer
690 views

Terminal Server CPU usage at 100%

I'm running a terminal server with around 50-60 users,and every so often the server will go from > 40% usage to 100%. I took a closer look an it seems every time this happens, a different user or two ...
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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 ...
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2answers
129 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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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 ...
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165 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 ...
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2answers
120 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, ...
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1answer
473 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 ...
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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
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1answer
219 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 ...
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0answers
271 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 ...
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1answer
79 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 ...
2
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2answers
2k views

SVN Returns 403 Forbidden

I followed these steps on my fresh VM (Debian 6) http://stackoverflow.com/questions/60736/how-to-setup-a-subversion-svn-server-on-gnu-linux-ubuntu i just realized where NameVirtualHostwas and ...
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1answer
137 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 => ...
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2answers
8k views

What is the proper way to change the product key for Office 2010 Professional Plus?

I am trying to clone a VM. I've done sysprep successfully and all is well with my new box, except Office 2010 Professional Plus product key did not get wiped by sysprep (not too surprising), and I am ...
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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 ...
5
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1answer
460 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 ...
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1answer
91 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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1answer
100 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 ...
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2answers
195 views

What is the best way to setup a heartbeat agent for failover between two VMs? [closed]

I have two VMs in VirtualBox that use NAT for their network adapters. They are both getting the same IP address, so I will need to reconfigure that; but knowing that, is it possible to set up a ...
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2answers
233 views

Failover Azure VM running SQL Server?

I'm currently looking at hosting an SQL Server database on an Azure Virtual Machine Instance and connecting the website via two load balancing web-roles. Due to various limitations in our application ...