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• allowing 2 VM's to communicate RED HAT 64 bit

  - by ????? ????????

  My physical PC is running 2 VMs on virtualbox. Both of the VM's are linux 64 bit. I am going through this tutorial: http://www.cyberciti.biz/faq/rhel-centos-fedoracore-linux-network-card-configuration/ in order to expose both of their IP's so that they can speak to each other. Mike Schwager November 25, 2009 at 10:55 pm Whoops! In section 3, you forgot about editing /etc/hosts. I believe RedHat comes complete with the system’s host ip address set up in /etc/hosts. Don’t forget to give it a look. I agree with Mike because after I looked into the /etc/hosts files, it has just default localhost stuff in it. How should I reconfigure the hosts file?

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• CPU's on Hyper-V host system is just idling, even though VM's are at full throttle

  - by Bjørn

  Hello, I have a server that is running Windows 2008 64 bit Hyper-V, with 8 gigs of RAM and Intel Xeon X3440 @ 2.53 Ghz, which gives me 8 logical cores in the performance monitor on the host system. I have set up three Virtual Machines, all running Windows 2008 32 bit. Build server, running Team City Staging server SQL Server, running SQL Server 2005 These three machines are running very sluggishly, they are at 100% cpu even though the host system is barely using any cpu at all, typically below 10% total. Could anyone please give some tips as to the best setup for CPU allocating? Should I have set each server to have two cores, or should I increase this number above the total number of cores on the host? What is a good number to set on the Virtual Machine Reserve and Virtual Machine Limit? Is 8 gigs of physical RAM insufficient for 3 VM's? Thanks for reading. :)

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• slow network in centos5 VM with centos5 host running KVM

  - by dan

  I setup KVM following the guide here: http://www.cyberciti.biz/faq/centos-rhel-linux-kvm-virtulization-tutorial/ I setup a bridged network and it worked fine except that the transfer speed is 200KB/s instead of the gigabit speed that I get on the host machine by itself. I tried editing the guest network settings to set "model=virtio" http://wiki.libvirt.org/page/Virtio but this just moves ifconfig-eth0 to ifconfig-eth0.bak in the VM and networking doesn't work at all. I tried moving ifconfig-eth0 back and starting up eth0, which works, but now the transfer speed is ~ 60KB/s I have no idea what else to try. Any suggestions would be greatly appreciated.

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• Windows activation on a Virtual Machine (Physical->VM)

  - by Daisetsu

  I backed up a number of laptops to virtual machines before they are to be re-purposed, in case I need the data at some later time. While the Physical to VM processes worked fine I am encountering issues on some of the VMs. When I boot them I get an error message saying I MUST activate windows in order to login. This is expected because the hardware changed (from physical hardware to virtualized hardware). I click the OK button and expect to be prompted with ways to activate, windows sits there for quite a while then tells me that "Windows has already been activated". I click OK at that message and get take back to the beginning where I am asked to activate Windows. I have done some fairly intensive googling but haven't been able to find a real solution. EDIT: The laptops with the issues are 2 Sony Vaios, I believe that they have the OEM version of the OS originally installed by the factory.

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• Hyper-V Manager: right-clicking on remote VM crashes MMC snap-in

  - by Greg Bray

  I have a Windows Server 2008 R2 Enterprise SP1 machine that I log into and use to manage virtual machines running on multiple Hyper-V servers on our domain. Sometimes, when I right-click on a remote VM, the Hyper-V Manager will crash and display the following error message: If I use the Actions menu on the lower right, it works just fine, but for some reason right-clicking causes MMC to stop working. Is there any way to fix this issue? Here are the full details of the error message. Description: Stopped working Problem signature: Problem Event Name: CLR20r3 Problem Signature 01: mmc.exe Problem Signature 02: 6.1.7600.16385 Problem Signature 03: 4a5bc808 Problem Signature 04: Microsoft.Virtualization.Client Problem Signature 05: 6.1.0.0 Problem Signature 06: 4ce7c9e3 Problem Signature 07: 342 Problem Signature 08: 1f Problem Signature 09: System.OverflowException OS Version: 6.1.7601.2.1.0.274.10 Locale ID: 1033 Read our privacy statement online: http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409 If the online privacy statement is not available, please read our privacy statement offline: C:\Windows\system32\en-US\erofflps.txt

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• Terribly slow Apache2 on VM Virtualbox

  - by cadavre

  I just launched VM Virtualbox with guest Ubuntu Server on host Windows 8. Both 64bit. Everything works perfectly fine. Maybe it's because I'm not using any X... Htop shows ~25% of memory usage, everything is fine, but not Apache2. Normally it's fine, but when I send request from my browser on host (networking mode set to Bridge mode), Apache2 is turning into 1-minute-long loading process with 100% CPU time. Any ideas how to debug it? Any ideas about solving this throat problem?

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• slow network in centos5 VM with centos5 host running KVM

  - by dan

  I setup KVM following the guide here: http://www.cyberciti.biz/faq/centos-rhel-linux-kvm-virtulization-tutorial/ I setup a bridged network and it worked fine except that the transfer speed is 200KB/s instead of the gigabit speed that I get on the host machine by itself. I tried editing the guest network settings to set "model=virtio" http://wiki.libvirt.org/page/Virtio but this just moves ifconfig-eth0 to ifconfig-eth0.bak in the VM and networking doesn't work at all. I tried moving ifconfig-eth0 back and starting up eth0, which works, but now the transfer speed is ~ 60KB/s I have no idea what else to try. Any suggestions would be greatly appreciated.

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• Simple recursive DNS resolver for debugging (app or VM)

  - by notpeter

  I have an issue which I believe is caused by incorrect DNS queries (doubled subdomains like _record.host.subdomain.tld.subdomain.tld) when querying for SRV records. So I need to an alternate DNS server with heavy logging so I can see every query (especially stupid ones), acting as a recursive resolver with the ability create records which override real DNS records so I can not only find the records it's (wrongly) looking for, but populate those records as well. I know I could install a DNS server on yet another linux box, but I feel like this is the sort of thing that someone may already setup a simple python script or single use vm just for this purpose.

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• Problem with Windows activation on a VM (Virtual machine)

  - by Daisetsu

  I backed up a number of laptops to virtual machines before they are to be re-purposed, in case I need the data at some later time. While the Physical to VM processes worked fine I am encountering issues on some of the VMs. When I boot them I get an error message saying I MUST activate windows in order to login. This is expected because the hardware changed (from physical hardware to virtualized hardware). I click the OK button and expect to be prompted with ways to activate, windows sits there for quite a while then tells me that "Windows has already been activated". I click OK at that message and get take back to the beginning where I am asked to activate Windows. I have done some fairly intensive googling but haven't been able to find a real solution. EDIT: The laptops with the issues are 2 Sony Vaios, I believe that they have the OEM version of the OS originally installed by the factory.

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• Hyper-V Manager right clicking on remote VM causes MMC error

  - by Greg Bray

  I have a Windows 2008 R2 Enterprise Server with SP1 that I log into and use to manage virtual machines running on multiple HyperV servers on our domain. Sometimes when I right click on a remote VM the HyperV Manager will crash and display the following error message: If I use the Actions menu on the lower right it works just fine, but for some reason right clicking cause MMC to stop working. Is there any way to fix this issue? Here are the full details of the error message. Description: Stopped working Problem signature: Problem Event Name: CLR20r3 Problem Signature 01: mmc.exe Problem Signature 02: 6.1.7600.16385 Problem Signature 03: 4a5bc808 Problem Signature 04: Microsoft.Virtualization.Client Problem Signature 05: 6.1.0.0 Problem Signature 06: 4ce7c9e3 Problem Signature 07: 342 Problem Signature 08: 1f Problem Signature 09: System.OverflowException OS Version: 6.1.7601.2.1.0.274.10 Locale ID: 1033 Read our privacy statement online: http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409 If the online privacy statement is not available, please read our privacy statement offline: C:\Windows\system32\en-US\erofflps.txt

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• How to Shrink large Hyper-V VM

  - by autrevo

  Using Disk2VHD utility I converted my bare-metal OS into Hyper-V VHD - http://technet.microsoft.com/en-us/sysinternals/ee656415.aspx And I could obtain a huge 190GB VHD file. Apart from performance issues, this VHD worked fine as guest when hosted on Windows Server 200 R2, Hyper-V. Having realized need to keeping only system files and application installations on VHD. I have deleted most of the junk data from this VHD and now it contains only 20-25 GB. But I am not able to shrink the VHD VM. Having done some research, I came to know, this as a limitation of .VHD files. Subsequently I followed these two step using Edit Virtual Hard Wizard on Windows 2012 Box. Convert from VHD to VHDX (took close to 3 hrs.) Compact (Another 4 hrs.) This did not ever shrink the VHDX either. Does Hyper-V does not provide proper support to handle large VHDs or VHDXs whose size are the range of 200GB.

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• How to use iSCSI inside HyperV VM?

  - by William

  I have 2 Dell R710 servers (intended to set up HyperV cluster) and a MD3000i SAN set up: Server1/Server2: NIC 1: connected to company LAN NIC 2: crossover to the other server's NIC 2 NIC 3: crossover to iSCSI port of SAN controller 1 NIC 4: crossover to iSCSI port of SAN controller 2 I have both servers setup as diskless servers with iSCSI boot from SAN without problem. But how can I access iSCSI from within the VM such that I can set up clustering inbetween the VMs? I can ping from the host to the SAN but found that NIC3/4 cannot be used for virtual network in HyperV? What am I doing wrong?

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• acessing a subnetwork from within a vm

  - by yan bellavance

  I have a pc running windows 7. I have vmwareplayer running RHEL5 I have 1 physical ethernet connection. this ethernet connection is wired to a hub. there is another device on that hub that needs to be in a certain subnetwork (192.168.0.xxx)(lets call him device X) but the general network is 192.168.1.xxx How can I configure the network adapters so that I can ping device X from RHEL5 in the vm. Originally I could ping google from both windows and rhel (I was in the .1 network) but not device X since he is on a different subnetwork address. Now that I have put it on the .0 I can ping device X from windows but not from rhel5 and cannot access the web. I did this by manually setting the IP address.

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• Ghost Image - windows asks for activation on when deployed to VM

  - by Chris Sobolewski

  I have several images created with Ghost Solution Suite (v11 I believe), the images have been in use for a few years now, but I am finally to the point where I have enough time to attempt to virtualize them for easier updates. I am running VMWare and attempting to image the virtual machines with my ghost image files. For my images I am running sysprep with minisetup and using reseal. The image deploys successfully, however when I start the VM for the first time, it demands windows activation. This doesn't happen when I image a physical computer, even a different model with different hardware. The idea of virtualizing my images becomes rather worthless if I am unable to deploy the images without having to activate every time (especially as Microsoft keeps declaring our volume licence key as invalid for activations). Does anyone know why it is asking for activation on a virtual machine, but not a physical PC? How can I prevent this?

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• Crazy VM clock drift

  - by SimonJGreen

  This is taken from an Ubuntu 10.10 VM running on ESX5: Nov 3 21:58:50 server1 ntpd[21169]: adjusting local clock by 31.187370s Nov 3 22:02:36 server1 ntpd[21169]: adjusting local clock by 31.159808s Nov 3 22:05:18 server1 ntpd[21169]: adjusting local clock by 31.067579s Nov 3 22:07:59 server1 ntpd[21169]: adjusting local clock by 30.952187s Nov 3 22:11:38 server1 ntpd[21169]: adjusting local clock by 30.890147s According to the VMWare KB no kernel tweaks should be needed for Ubuntu 10.10 to maintain time to their standards. What's especially odd is the drift seems fairly consistent. Any help appreciated on this one!

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• Error starting Hyper-V VM

  - by Peter Bernier

  I'm trying to start a VM on a new Hyper-V installation and I'm receiving the following error: The virtual machine could not be started because the hypervisor is not running. The following actions may help you resolve the problem: 1) Verify that the processor of the physical computer has a supported version of hardware-assisted virtualization. 2) Verify that hardware-assisted virtualization and hardware-assisted data execution protection are enabled in the BIOS of the physical computer. (If you edit the BIOS to enable either setting, you must turn off the power to the physical computer and then turn it back on. Resetting the physical computer is not sufficient.) 3) If you have made changes to the Boot Configuration Data store, review these changes to ensure that the hypervisor is configured to launch automatically. My machine supports virtualization at the hardware level and it is enabled in BIOS. Why am I receiving this error?

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• Hyper-v error starting vm after reboot

  - by mamu

  Hi rebooted hyper-v host running server 2008 r2. After reboot one of my vm is throwing following error. 'The version does not support this version of file format' Out of my all vms this was only set to save state when shutdown. I tried deleting state and start still same error. Tried inspect disk as well edit disk both throw same error when try to open this. What could it be? any way to resolve it?

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• Creating a vm using Hyper-V causes the host of BSOD

  - by Arcass

  Hi, Problem description: When I try to create a virtual machine, the host bsod part way through the process. From the logs in lookes to fail/hang on the "Creating new VirtualDisckDriver with new VHD" step. The BSOD error code is SYSTEM_SERVICE_EXCEPTION : STOP:0x0000003B When the machine has finished restarting, it looks to have created the vhd and XML files for the vm but it isn't accessable. I have two server bothing behaving in exactly the same way, so I don't believe it's a hardware fault. Has anyone had a similar experince? How did you resolve the problem? NOTES Hardware: HP DL380 G6 BIOS : 2010.03.30 (14 Apr 2010) [Latest from HP website] Inter Hyperthreading: Disabled Intel Virtuazation Technology : Enabled No-Execute Memory Protection: Enabled Mem check reports no errors OS: Windows 2008 Sp2 x64bit fully updated regards Arcass

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• CentOS VM, NTP synchronization problems

  - by Spirit

  We have three CentOS 5.9 VMs on an ESX3.5 host. Because of the nature of the services we provide it is required that the NTP time is synchronized and the time is correct on all three of them. However one of them constantly drifts back each day for about 66 sec. So far none of us seems to understand as why is this happening. We included the possibility that the VM may be somehow pulling the time from the host, however all of the three VMs have identical configuration settings and they did not have VMware tools installed. Although I realize that this is probably a question of an internal matter and not to ask for on a forum, I would appreciate if anyone of you knows some CentOS NTP diagnostic routines that will help me to diagnose the problem and find a reliable solution. I thank you for the assistance.

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• VM Build XML file fails to validate against OVF 1.0 schema

  - by siddharthgod

  For our product, we were trying to generate VM / vApp build XML from java code. For this purpose, we were using XML Beans. When we tried to generate JAVA classes for OVF envelope for 0.9 (ovf-envelope.xsd in schemas/ovf) it was successful. However these schemas does not allow us to add IPassignment section which is available in OVF 1.0. When we tried to compile 1.0 schema (ovfenv-vmware.xsd in schemas/ovf1.0.0e/vmware folder), we get validation errors. When we loaded this schema in schema editor we could see some validation errors. First error we saw was following: When we loaded ovfenv-vmware.xsd in XMLspy we could see following validation error in dsp8027.xsd - "cos-nonambig: makes the content model non-deterministic against . Possible causes: name equality, overlapping occurrence or substitution groups." Same error was also thrown by xmlbean while generating java classes from ovfenv-vmware.xsd. Is there any workaround for this problem?

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• VM clients can not access WAN

  - by Saariko

  I have a new VM host on my network, on a Dell R620. The dedicated iDrac is connected with static IP of: 192.168.3.x NIC #1 is connected to my router The eSXI 5.1 host is with IP of 192.168.3.250 The vSphere appliance has a static IP of 192.168.3.241 All the clients on the new host are in the same network 192.168.3.x All clients are Windows 2008 R2 My problem is that non of the clients can access the WAN. I can't ping anything which is beyond my router. I CAN ping anything within my router, even if it's on a different subnet - 192.168.0.x (Router rules are in tact and working) I can ping the gateway (192.168.3.254) One thing that I checked, and is bothering my (but don't know if it has any relevance) is that on the Host Networking properties, there is a vmnic0 (picture) that shows as if it only recognizes 192.168.0.x network - is that so? The command: route print shows me the following details, where I have a duplicate entry for 0.0.0.0 (and one is wrong) - which is probably also why it's not working

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• Create a web interface that starts VM's on the server side

  - by xdragonforce

  I am creating a service called TorCompute which allows for creating virtual Tor Hidden Service servers on my infrastructure (I say infrastructure, by that I mean just the 3x 32GB RAM machines waiting to be purchased). What I would like to be able to do is for users to log on, access the web interface and spin up a VM with a variable about of RAM/Disk Space. I've written the PHP for logging in and have a nice web interface, just I need the code to actually create them! How would I go about doing this? Thanks, Stewart EDIT: I will run them with VMWare Server, with vmrun

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• ubuntu server in a vm, can't connect to internet

  - by jessh

  I'm attemtping to host my own development web server in a virtual box guest, Ubuntu Server. I would like this virtual machine to be accessible from not only my home network, but outside the LAN as well. As such, I've set up a static IP (so I can later forward ports to this static IP.) My virtual box settings have this vm only using one adapter -- in bridged mode. Here's what my /etc/network/interfaces looks like: iface eth0 inet static address 10.0.1.203 /*this is outside the DHCP range*/ netmask 255.255.255.0 gateway 10.0.1.1 network 10.0.1.0 broadcast 10.0.1.255 dns-nameservers: 8.8.8.8 8.8.8.4 Here's what the output of ifconfig looks like: https://dl.dropbox.com/u/2241201/locker/ubuntu.png My Host is a mac mini, running OS X 10.7. From within the guest, if I ping google.com: $ ping google.com # outputs 'ping: unknown host google.com' immediately Why am I unable to access the web?

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• Revert a VM client from within the VM Client - is it possible?

  - by Saariko

  I am creating a test VM client for our QA department. Once it's installed, my options will be: Use a snapshot Use non persistent disk on the hard disk. For either options, I can give the role of QA_DEP the ability to log to vCenter and go back/power-off the client - so they can return to their clean machine. My question: is it possible to have that ability without using vCenter? What If I want that on a Client reboot - it will return to it's initial/clean state? The clients are not gonna be heavy loaded.

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• Hyper-V stuck restoring VM

  - by Blax

  I have a hyper-v server that runs 5 virtual machines. I believe the physical box rebooted last night which is usually not a problem but this morning one of the virual machines is stuck at "restoring 0%". I have rebooted the physical machine and same thing, 4 virtual machines come up fine the 5th gets stuck at "restoring 0%". I right-clicked the VM in hyper-v manager and selected "Cancel restore" and nothing happens. I was able to copy the VHD to another hyper-v box and light it up there so I know the VHD is good. Any ideas on what to look at next? If I can I would like to just dump the saved state and move on, or if there is a better way to handle it I'm all ears. TIA!!

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