Virtualization is a group of software technologies that allow abstraction between layers of a system. This allows separation between the logical layers of the system, providing isolation, flexibility, and/or the ability to run more than one at a time. This differs from most traditional systems where ...

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Ping (DUP) with Linux bridges and tap devices

http://imgur.com/qPoy2QJ I have two Linux (Ubuntu 12.04) VM (running on KVM) that networked together using two Linux bridges as shown above. The network interfaces are Linux TAP devices. The problem ...
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0answers
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Not able to ssh into host from KVM guest when using user mode networking(default) [migrated]

I used virtual machine manager to create a Ubuntu VM which uses default NAT based networking still using the default address 10.0.2.2 I am not able to ssh into the host, neither can I connect to VM ...
4
votes
1answer
730 views

TCP/IP performance tuning under KVM/Qemu

With more and more companies switching to public cloud services, I'm curious what you guys' thoughts are on TCP/IP tuning in the cloud. Is it worth bothering with? Given that you don't have access to ...
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1answer
35 views

Servers vs. Worker Processes [duplicate]

Just wanted to get some other opinions. I am currently having a discussion on how to go on a web environment. We want to virtualize our web layer for a very active site. However, there is a debate ...
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1answer
48 views

Increase disk space in a VM using LVM : Best practices?

When you have virtual machines, the size of disks can be changed, and specifically, increased. That makes the problem of resizing LVM a bit more complex than on a physical server. There are three ...
2
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1answer
719 views

Blank desktop when logging into a Virtualized Windows 2008 Terminal Server?

We have a Virtualized Terminal Server running Windows Server 2008. When the admin user logs in, everything is fine. When anyone else logs in, their desktop and start menu is blank (they have the ...
6
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3answers
238 views

What does ZeroVM virtualize?

I'm having a bit of trouble wrapping my head aroung ZeroVM. Let's say I want to run Wordpress. One option is to lease a hosted virtual server running VMWare, Virtualbox, Xen, CoreOS, or something ...
2
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1answer
55 views

Disk Space Difference On Hyper-V Server OS VS VM Guest OS

I have a Windows Sever 2012 Standard 64-bit running Hyper-V. The Hyper-V is hosting a guest OS of Windows 7 Professional 32-bit. I noticed that I was running out of disk space on my server. So I ...
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11answers
20k views

VMware Linux Server — how can you tell if you are a vm or real hardware?

An interesting question. I have logged into a Linux (most likely SuSE) host. Is there some way that I can tell programmatically that I am a VM host or not? Also assume that the vmtools are not ...
10
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11answers
24k views

How do I know if I'm working on a Virtual Machine or not? [duplicate]

Is there a way to know if the machine I'm working on is virtual or physical? (I'm connecting with RDP to the machine. If it's a virtual machine it is working and handled by VMWare). Thank you in ...
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2answers
34 views

Are computations performed in a Docker container exactly repeatable?

I've read the question titled "How is Docker.io different from a normal virtual machine?", but I'm still not certain how "virtual" docker containers are. For example, in a scientific setting, ...
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0answers
16 views

Linux Containers (LXC) : lx-execute and networking

I have a question about LXC Containers. I have some containers, if I lxc-start them, they come up with networking fine, but I want to just be able to run commands against them using lxc-execute, ...
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1answer
838 views

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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0answers
21 views

VDI or other deployment for remote office 2D CAD (AutoCAD 2014) [closed]

At the company I work for we currently have two facilities (west coast and east coast) and we are attempting to consolidate the majority of our IT resources into a single facility, for a variety of ...
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1answer
30 views

Run VMware inside nested VM hosted by Hyper-V [closed]

I have Hyper-V running on my system and I thought I would host a VM on my system to expose a second Windows 8.1 VM on top of the system with Hyper-V. My goal is to run VMware inside this virtual ...
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1answer
2k views

File .vmx not found error when trying to create a VM snapshot after removing an independent volume

I had had a Windows VM having a second virtual drive configured as an independant volume placed on a second datastore on a VMWare ESXi 5 server. Then I have removed the second drive by removing it in ...
2
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4answers
55 views

new hyper V High Avaliability setup and SMB 3.0 storage

I am looking at building an new 2012 R2 with Hyper V setup, everything has to be HP hardware. 2x HyperV 2012 R2 servers running 20-30 VMs. These will be dual 6 core xeons with 128gb of ram. 2x 2012 ...
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1answer
62 views

Two domains within the same IP Range

We are in the process of implementing MS Dynamics AX and a requirement by our consultants is to have a test environment. We can build this environment and let it use our live AD setup however I wish ...
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0answers
24 views

ESXi 5.1 SCSI and NMP Errors Filling vmkernel.log

On a group of ESXi 5.1 systems, I am seeing the following errors every 5 minutes or so: 2014-04-04T11:22:45.374Z cpu1:8193)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x4124022be3c0, 0) to dev ...
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0answers
15 views

Xenserver firewall consideration

We are setting up Xenserver for a production environment with seperate VMs for a website, billing, control panel, mail. My question is, should we rely on each server's IPtables or is it necessary to ...
4
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2answers
161 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, ...
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1answer
33 views

Relationship between KVM Virtualization Host and Guest resource utilization

I have a KVM Virtualization host with 8 cores and 32GB of RAM. The machine is used to host VMs used in evaluating software, configurations, etc. Typically there are 2-4 VMs running simultaneously. The ...
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1answer
70 views

Which CPU model to set for guest KVM when processor is Ivy Bridge?

For a KVM host with an Ivy Bridge processor, which MODEL should use for CPU>CONFIGURATION in Virtual Machine Manager? Ivy Bridge is not available.
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0answers
20 views

What software allows a templated VM to be configured on its first boot?

I've encountered VM templates distributed as an OVF with a feature so that when you boot the VM for the first time you are prompted for configuration options such as hostname, IP address, root ...
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1answer
31 views

XenServer virtual network firewall

We are setting up XenServer machine with several VMs for our ecommerce business. We are intending to distribute services across several VMs (1 for web, 1 billing, 1 email, etc.) The XenServer machine ...
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1answer
26 views

How should I package a VM template to be cloned repeatedly, along with a single large storage volume for all instances to share?

I have a number of VMs that were based on the same template, each with about 2GB of storage. They all share read-only access to a 50GB volume (currently via NFS, but that is up for negotiation). I ...
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4answers
890 views

VMWare vSphere Hypervisor - needs to pre-partition disk?

I'm a software developer, but I understand the benefits of virtualization. I asked our IT guy to buy a new HP Proliant with a Smart Array controller in RAID 5. We are a very small company, so I had ...
0
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1answer
27 views

Move big file from VM to host hypervisor in vmware vsphere

I have a big file (220G) I would like to move from a virtual machine to its host. The file is actually another virtual machine's disk file. for other smaller files, I would have done that with a ...
1
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1answer
35 views

Under what circumstances could multiple VMs and mounted drives have corruption at the same time?

Today I had to fix 3 VMs with near identical file system errors all running Redhat 5 or 6. Basically the VMs had corrupted inodes and remounted / as a read-only file system, also corrupting several ...
71
votes
4answers
12k views

Why is TCP accept() performance so bad under Xen?

The rate at which my server can accept() new incoming TCP connections is really bad under Xen. The same test on bare metal hardware shows 3-5x speed ups. How come this is so bad under Xen? Can you ...
0
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2answers
60 views

Firewall high availability

Context: My company is on the verge of a major network improvement, we will expand our network to remote offices via radio bridges. The firewall will be handling: 3 mission critical networks 3 non ...
2
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1answer
32 views

RHEV Manager best practises

I've been playing around with RHEV. I was wondering what is the best practise for the RHEV Manager in terms of installation. In a big production environment is it best for the Manager to be installed ...
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2answers
42 views

When emulating an OpenWRT Router in VirtualBox how do the network settings relate to a real world router?

I'd like to setup OpenWRT in VirtualBox for purposes of testing a network configuration before putting it on a live physical router. How do the adapter settings relate to the real physical ports on ...
0
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1answer
15 views

Configure GRUB on XEN VPS

I have a xen VPS with debian 7 x86_64 installed on it. The operating system comes with GRUB2 installed on it. The problem is that while runnnig apt-get update apt-get upgrade -y GRUB says The GRUB ...
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3answers
1k views

Cannot change PostgreSQL port

I run Postgresql 8.4 as a service on a CentOS 6.2 server. I set port = 21444 and listen_addresses = '*' in /var/lib/pgsql/data/postgresql.conf and I changed 5432 to 21444 in postmaster.opts and ...
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2answers
1k views

Virtualizing a Windows 2000 host for use in Hyper-V

I'm looking for a way to successfully import a Windows 2000 host (running several legacy applications that do not work on newer editions of Windows). I normally like to use Disk2VHD for making a ...
0
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2answers
54 views

associating HP MSA2000 G3 to a virtual machine on windows server 2012 DC

Basically i wanted to have a Debian Squeeze associated to the SAN HP MSA200 G3 but due to lack of support i have now planned to deploy Windows Server 2012 Data-center on 2xHP Proliant DL380p G7 ...
2
votes
2answers
812 views

VSFTPD does not allow upload with virtual users

I am attempting to setup VSFTPD with virtual users on a server running Ubuntu 12.04. I have configured the server to allow for virtual users to login, but I am having trouble getting it to allow ...
0
votes
1answer
1k views

How do I tunnel an HTTPS proxy through a virtual machine (VMWare)

I have a personal setup at home using VMWare Workstation. I also have a set of Virtual Private Machines that run Squid, and therefore provide me HTTPS proxy tunnels. Using Proxifier, I can tunnel all ...
0
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1answer
28 views

CloudStack New Install / Infrastructure Questions

I’d like to set up a public cloud for web hosting (cloud shared hosting, cloud vps, cloud servers) for a new venture, using Apache CloudStack platform. ----- Question #1 ----- What is the proper way ...
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1answer
2k views

Difference between 'Custom' and 'LAN Segments' networking options in VMWare 8?

For communicating between VMs, what is the difference between the 'Custom' and 'LAN Segments' networking options in VMWare 8? The documentation is not clear. Does one of them have any advantage ...
1
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2answers
42 views

5-7 second latency between Apache server and MySQL server when website calls on database server

I am currently running a virtualized environment for my web and db server. When I access the web server or the MySQL server individually, they are both fast. I also have websites running on the web ...
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0answers
23 views

Jumphost VM not able to communicate with LAN

I have setup a jumphost VM on WinXP. It has 2 NICs. NIC1, which is the LAN, has the following IP settings: IP: 10.0.0.1 /24 (No default/ DNS configured) NIC2, which has external connections, has ...
3
votes
2answers
5k views

Changing boot device for a QEMU-KVM virtual machine

I am trying to change the boot device for a VM. I go to the VM's XML file in /etc/libvirt/qemu and set <boot dev='cdrom' />. Still, it attempts to boot from the harddrive instead of the cdrom. ...
0
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1answer
28 views

Intel VT enable but not found in xenserver

I have an IBM 206M with this CPU --> Intel Presler Pentium D 950 Socket LGA 775 P4D 3.4 Ghz 800Mhz FSB 4M Cache EM64T. It has Intel Virtualisation tecnology. But when i want to install xen server, the ...
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1answer
23 views

Unable to add a vCenter server to VMware Horizon

I've installed VMware Horizon on a virtual machine which is on my ESX. In order to configure it, I have to specify the vCenter server into the Horizon's configuration. But when I try to specify the ...
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2answers
261 views

Open Source Live Migration (Clone/Imaging)

I want to do a live migration of my Fedora and Windows Server 2003 into raw disk image without restart the server or shut it down. (disk image is for virtualization purpose) Is there any open source ...
1
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2answers
730 views

Xen Remus setup

Currently, I'm running the IT for a small organization, and we just purchased a new server to replace our aging Dell poweredge. As the Dell isn't so bad as to be junk, I was hoping to set up Xen on ...
0
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1answer
819 views

setting CPU cache size and model for KVM guest

Is there any possibility to create a custom CPU model for KVM Linux guests, or at least to modify parameters such as cache size and model name? I know I can set CPU features, topology and pinning and ...
0
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0answers
18 views

How does Xen resize VMs without shutting them down?

I'm experimenting with Xen on a spare machine and I noticed that it can resize the RAM and CPU allocations of my VMs without shutting them down first. VirtualBox, VMware Fusion, etc. can't do the same ...