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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735 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 ...
3
votes
1answer
286 views

How to get virtualized SR-IOV Infiniband interface UP?

I've spent several days on this now and I've managed to get SR-IOV working with the Mellanox Infiniband card using the latest firmware. The Virtual Functions appear in Dom0 as 06:00.1 Network ...
3
votes
1answer
314 views

Adding virtual NIC to HyperV VMs killed my network speed

I have a pretty simple configuration: Windows Server 2012 Hyper V Host, with two VMs (both Server 2012), one for IIS, one for SQL Server. They're all connecting through the physical NIC Last night I ...
3
votes
1answer
116 views

Ext4 cache options on a virtual machine

I'm trying to speed up a standup of virtual machines used for development / automated test environments and wanted to verify some assumptions about disk writes caching. I'm using ext4 for the root ...
3
votes
1answer
331 views

I can't install windows 64bit on Virtualbox headless

I'm trying to install Windows2008r2 64bit on a Ubuntu 12.04 64bit host. After created the VM (with --ostype windows2008_64 I boot up the installation iso but windows says: Attempting to load a 64-bit ...
3
votes
1answer
115 views

xend doesn't bring up the vif interfaces

I'm trying working with Xen and I've tryed to build up a virtual machine in domU. I'm using the following configuration for the domU kernel = '/media/home_separata/domU_kernel/boot/vmlinuz-linux' ...
3
votes
1answer
346 views

(Virtual) Windows Server console: Black screen

When connecting to our virtual Windows 2003 Server (SBS 2003 SP2) via a normal RDP session, everything works fine. However, when connecting with /admin to get to the console session, the following ...
3
votes
1answer
535 views

With CentOS 6 and LXC, “ifconfig” is unable to see network interface (but busybox “ifconfig” works fine)

I've just started working with LXC under CentOS 6 (via the libvirt adapter). If I create an LXC container, I'm unable to see any network interfaces when using the native system tools: # ifconfig -a ...
3
votes
1answer
149 views

Is there any simple, free tool to track VM dependancies to linked-clones in VMWare?

We have a few "base installations" of various OS environments that we use to create linked clones in VMware Workstation. Sometimes, to save space and because speed is of secondary importance, those ...
2
votes
1answer
126 views

VMWare vSphere 5.5 management interfaces unreachable

I've got a vSphere 5.5 Essentials Kit; One of the hosts, a Dell R410, is running vSphere 5.5 and as of yesterday it is unresponsive to any of the management tools. I've tried the following: Web ...
2
votes
1answer
32 views

Saving the State of an Application using App-V or some other type of Virtualization Technology

I have an application that I would like to be able to create "snapshots" of (sort of like you might do with a virtual machine). Basically I would like to be able to allow the user to do a bunch of ...
2
votes
1answer
363 views

Anyone using Archipel in production for managing virtual machines?

I am getting ready to deploy a new server for my company. We intend to use virtualization mainly for security but also to help with versioning and other issues. We have decided to use openvz. Now I ...
2
votes
1answer
560 views

virt-install kept on adding --no-reboot - even though I don't want it to

I have a bit of a problem getting my guests to reboot after the OS installation using virt-install. For whatever reason, virt-install insists on inserting "--no-reboot" when you create a VM: ...
2
votes
1answer
358 views

Setting up reverse proxy for virtual machines on HostOS

I am currently installing a server that consists of a Virtualization Host (kvm on ubuntu) and 7 VM's, some running MySQL and LDAP, others running different webservers and webapplications. The VMs ...
2
votes
1answer
383 views

Installing and running a guest OS on KVM-qemu with only serial console access

I am trying to installing a bsd distro with virt-installer. With a Linux distro I used this: virt-install -n debian -r 1024 --vcpus=1 --accelerate -v --disk ...
2
votes
1answer
111 views

Strange CPU usage on Windows Server 2003 vs. CentOS5.4

I have two Virtual PCs running Windows Server 2003 and CentOS 5.4 on a host machine. I use a java server on both of them. I copied the java server's files from the host machine on to both of the ...
2
votes
1answer
722 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 ...
2
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1answer
323 views

Process PHP files from a network share in a vmware virtual machine

As a testing environment, I have set up a vmware virtual machine running Windows Server 2008 R2. I have Apache and PHP installed (as part of the xampp package). I am doing the development outside of ...
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1answer
55 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 ...
1
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1answer
62 views

(simple) linux HA with vmware vsphere?

I hope my upcoming question is specific enough, and you are able and willing to support :-) We have several openSUSE VMs in an ESX-Cluster (three ESX-Servers) with an attached iSCSI-SAN. All of ...
1
vote
1answer
78 views

HP ProLiant DL160 Gen5 Virtualization

we want to create some vm's on older server. Its an HP ProLiant DL160 Gen5 with an Xeon 5405. So by the intel specs (http://ark.intel.com/products/33079) the cpu included the VT-x technology. But ...
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1answer
67 views

User-specific alias for virtual machine

Our systems people are working on getting us all up and running on virtual machines. There will be a certain set of machines for each performance level, and we'll be able to upgrade and downgrade as ...
1
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1answer
138 views

Private networks with SCVMM 2012 SP1 and Hyper-V

In my lab I have two hyper-v host running Windows 2012 server. For lab and test purposes I want to have private networks that are available on both hosts, and where the VMs on those networks are able ...
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vote
1answer
92 views

Changing the mac address in a libvirt xml config file breaks network connectivity for the guest

I'm using Xen with libvirt and trying to set it up on a bridged interface. I am able to install an OS and everything works as I would expect. If I save the xml output from "virsh dumpxml guest", edit ...
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vote
1answer
129 views

How can I manually add packages to cobbler repo (RHEL/CENTOS)

So I have an air-gapped network. We primarily use RHEL, sometimes CentOS. I'm building a utility "cloud" that needs to be able to kickstart from bare metal, as well as provision vms and kickstart ...
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vote
1answer
439 views

Cannot connect to Openstack Instance via horizon, but SSH works?

I've got an OpenStack deployment running inside a VM for testing purposes. My setup is as follows: Host Ubuntu x64 with Virtualbox -> Guest Ubuntu x64 with OpenStack -> Ubuntu X64 Server Test ...
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1answer
208 views

Hardware Virtualization Technology Enabling Issue

I have purchased an Intel i7 3770 and an Asus P8Z77-M Pro; for some Windows Server 2012 testing. In the BIOS I have enabled the "Intel Virtualization Technology", and have several Hyper-V based ...
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vote
1answer
113 views

Apply libvirt nwfilter without editing of XML

Is it possible to apply libvirt's network filter to a KVM guest without manually editing the XML (for use in scripts)? Or is there any easy way of pushing the network filter configuration into ...
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vote
1answer
181 views

Xen: iSCSI initiator in dom0 VS in domU with BCM5709 ethernet cards

In the future we'll move from local storage for our VMs to an iSCSI-based solution. Our server vendor supports Broadcom NetXtreme II 5709 cards with dual gigabit ports and TOE + iSCSI acceleration. ...
1
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1answer
65 views

EC2 Ubuntu images for local usage

Ubuntu provides virtual images that are used by Amazon EC2. They can be started locally e.g. by running: qemu -fda precise-server-cloudimg-i386-floppy -hda precise-server-cloudimg-i386.img ...
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1answer
209 views

Does CloudStack support the Open Virtualization Format (OVF)?

The questions says it all. Can someone tell me the answer please? I have researched but I'm still not sure. Thanks.
1
vote
1answer
334 views

How do I measure and compare disk performance of my Hyper-V Windows VM?

I'm not sure whether this sounds stupid or lazy, but I'm really not sure. I have a problem with the performance of a VM setup (2008R2-64bit Hyper-V running a 2003R2-32bit Windows server) and I'd like ...
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vote
1answer
253 views

Hyper-V Test Bed for Forefront TMG 2010 Networking Issues

I am trying to set up a Server 2008 R2 test bed for a Forefront TMG 2010 deployment and I can't seem to get the networking configured correctly. The set up is as follows: Hyper-V Host has two NICs, ...
1
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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
vote
1answer
335 views

Give a KVM Guest only access to OpenVPN

I'm in a kind of weird situation where I need to do the following: Connect an OpenVPN tunnel with static RFC1918 IPs (think of 10.3.3.1 for the server end and 10.3.3.2 for the client end) and have it ...
1
vote
1answer
308 views

Windows Server 2008 as Bridge in virtualbox: make another Virtual Machine enter his Domain

I have installed a Windows Server 2008 in Virtualbox(bridge) this one work fantastic! i want to make a virtual machine(virtualbox) which can enter the Domain and access my Server 2008(Datacenter). ...
1
vote
1answer
61 views

Does Microsoft Virtual Machine Manager Support Storing VHDs on File Server Share?

I have a Hyper-V server running perfectly fine with the VHDs placed on a separate file server shared folder. Now when I install MS Virtual Machine Manager and add the host machine to VMM, it says ...
1
vote
1answer
286 views

virtio /proc/net/dev

we are doing some VM (citrix-xen) / real machine benchmarks at university and ran accross a strange behavior. we used netperf's stream test to meassure the performance between the two machines. both ...
1
vote
1answer
352 views

help to optimize container

I have an openvz node with only one container (Cpanel server). Yesterday I had many memories issues: Unable to fork: Cannot allocate memory Can someone help me to optimize my node setting ? I ...
1
vote
1answer
284 views

CPU usage is very large in top command of Linux

I run SUSE Linux Enterprise Server 11 SP1 in a virtual machine. The hypervisor is KVM. There is 4 virtual CPU cores for the VM. Now there is a very strange thing. In theory the maximum CPU usage ...
1
vote
1answer
546 views

Resizing a partition on a virtual hardisk (file with msdos partition-table)

I have a local file on my disk which contains a msdos partition table and some linux-partitions. I use this as a virtual raw disk with qemu. klm@lato:~/images/disk$ parted arch-linux2 p WARNING: You ...
1
vote
1answer
167 views

openvz node with only one vps

I have an openvz server with 2Gb ram and would like to configure a vps for use all server resources (no swap). I run: vzsplit -n 1 -f vps1 -s 0 and have this setup: Configuration file generated by ...
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98 views

domU networking is better than dom0

I am using a 2.6.35 domU guest on a 2.6.32 dom0 and a 4.0.1 Xen hypervisor. Using netperf with UDP_RR I get 1819 and 622 transaction per second for domU and dom0 respectively, but in UDP_STREAM test ...
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0answers
131 views

Build a crossbrowser testing server with VM

I need to create for internal use a server that will provide browser screenshots of different Browsers on different OS. A similar service is offered by http://browsershots.org and ...
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0answers
273 views

Hyper-V: Permanently put a VM on a VPN network connection?

I have a Hyper-V Server on an off-site network. I want to be able to put any given VM on it permanently on my corporate PPTP VPN network. i tried to do this with Routing and Remote Access by ...
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4k views

No network connection for vmware esxi guests

I'm new to VMware and setting up an Esxi server as a trial with the intention of possibly virtualizing some of our servers in the near future. I have setup ESXi on a Dell poweredge server, and ...
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0answers
1k views

Unable to connect to ESXi 4.1 host

I've just installed an ESXi (4.1) system. The install appears to have completed successfully, and the host boots to the yellow/black login screen. Additionally: I can log in to the local ...
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0answers
144 views

Why RHEL6 Virtual Machines have network breaks in Hosting Center.Why there is network breakdown with Virtual Machines hosted at hosting center

We hosted two servers with Virtual Machines using bridged network in the Hosting Center.But we faced problem with network breakdowns quite often. The details are Host1 192.168.125.2 VM1inHost1 ...
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0answers
270 views

Need help on Desktop PC convert to diskless client booting to hyper V with terminal session

Does anyone around here share their ideas in building up a thin client and boot it to Hyper V? I want to use my old desktop PC with no OS, no hardrive booting it up unto a terminal session to the ...
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0answers
313 views

Xen bridge networking without DHCP

I'm totally new to virtualization and have a problem. My virtual machine fails to access internet cause DHCP isn't available. When I try to assign it an IP it also fails, probably because I need to ...