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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300 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
26 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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0answers
151 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
171 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 ...
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2answers
101 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
34 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
184 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
208 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
262 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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2answers
102 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
64 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
106 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
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2answers
829 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
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1answer
316 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
88 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 ...
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3answers
1k 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
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1answer
302 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
80 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
89 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
66 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
49 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
140 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
71 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 ...
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2answers
144 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 ...
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2answers
73 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 ...
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0answers
218 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
162 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 ...
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0answers
89 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 ...
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2answers
185 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 ...
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0answers
45 views

OVF/OVA extra files

Can anyone suggest a method to do the following: We need to include an extra file (probably just a small text file with a serial) in an OVF file before we wrap it up into an OVA for deployment. Here ...
4
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2answers
551 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
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2answers
533 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
58 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
360 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 ...
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0answers
155 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
367 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
50 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 ...
4
votes
1answer
83 views

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 ...
2
votes
3answers
423 views

How to troubleshoot performance issues of PHP, MySQL and generic I/O

I have a WordPress based website running on a shared hosting. Its response time is very decent (around 2s to retrieve the HTML page and 5s to load all the resources). I was planning to move it to a ...
0
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0answers
82 views

Nested VM Guest Access from Host - KVM

I have nested VM setup. I have a host with a single network interface card with a public facing IP. I have bridged this interface so that eth0 does not have a IP and br0 is having the IP instead. I ...
0
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0answers
223 views

Windows Server 2012 R2, multiple Hyper-V Virtual Network Switches for multiple VMs

I want to configure something like this: I have one NIC, and have been given 3 IPs by datacenter, on my server which is running WS2012R2, with 10 VMs on hyper-v. Windows Server 2012 R2 (host) one ...
0
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0answers
18 views

Filesystem not 100% accessable all the time for our application after changing to virtual environment?

First of all my scenario : 3 servers one for services who are taking content over network share from SQL server one SQL server win 2008 / sql 2008 one web server all are physical machines. now we ...
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2answers
278 views

Install ubuntu on my KVM VM by proxmox

I'm a newbie here but I would like to understand how to install ubuntu or centOS on my VM created by KVM (in proxmox). During creation, I've set Linux 3.X/2.6 Kernel (l26) in sheet OS and Do ...
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1answer
465 views

Proxmox drbd configuration split brain

I am planning a proxmox HA configuration with two Dell R710 machines (dual 6 core processors in each) with enterprise level drive raid arrays. I would be using DRBD with a quorum disk on a third ...
3
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1answer
60 views

Virtual Server HDD shrinks without apparent reason

We have a virtual hosted Linux server, and in the last few months every now and then the HDD shrinks from 400GB down to the exact byte count that is in use. All existing data can be downloaded and ...
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0answers
94 views

Asign public ip addres to vmware virtual machine on linux host

We have server with linux installed on it (old debian 5.0). In this OS we have old VMWare server 2.0 installed (I know all is too old, but we don't have time to change it now) in which is installed ...
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0answers
51 views

Virtual Desktop Provisioning - Vmware View 5.2 Maintenance Questions

Currently running an environment of about 400 VMware View 5.2 virtual Desktops. The environment runs pretty efficiently but we sometimes run into problems with certain pools from time to time. Just ...
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0answers
143 views

How to install Gitlab in a VM on a production server?

I have a production server running Ubuntu 12.04 and I would like to install on it a VM with Gitlab (using Vagrant and Virtualbox). Let's say that the address to access Gitlab is gitlab.mydomain.com . ...
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1answer
69 views

moving to a new dedicated server and need advice on the new setup [closed]

I currently have a dedicated server that we have outgrown and we are moving to another server. Our current setup was a 8gb W2008R2 server running a W2008R2 IIS virtual machine using VMWare. We are ...
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2answers
170 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 ...