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• How to set path of Virtual PC hard disk differencing parent

  - by Barry Kelly

  I have an old Windows XP Mode vhd backed up from my previous system, but I'm having difficulty getting it running on the new system. The vhd is a differencing disk, and its parent is the standard Windows XP Mode base; I still have the old parent, and have verified it is binary identical to the XP Mode base in my new installation of XP Mode. But in the new system, the path to the differencing disk parent is different than the old. When I open up the settings for the .vmcx for my old XP mode, and select "Hard Disk 1", the "Virtual hard disk file" is set correctly, but the "Parent Disk:" field is pointing at the wrong path, and I can't see any way to edit it. Does anyone know how?

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• Configure Windows Routes for VPN

  - by Florin Sabau

  I have a Virtual PC/VMWare machine that runs Windows Server 2003. This virtual machine uses an IPSec VPN client program to connect to a remote network. I configured the virtual machine to have 2 NICs: NAT - to be used by the VPN Client to access the remote network Host only - to be able to access the virtual machine from the host The reason I have this setup is because I want to be able to access some remote network from the host machine. I could've installed the VPN client on the host machine, but the host runs Windows 7 and the client doesn't support it. The problem: although the virtual machine is normally reachable (ping + http access), as soon as the VPN client is started, neither of the NIC addresses are reachable anymore. I'm wondering if it is a routing problem that needs to be addressed? How do routing/VPN client connection affect the ability of the server to respond to client requests from the host?

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• Move virtual machine hard disk to a separate physical hard disk for better performance?

  - by joeeoj

  I have a dual-core machine with the host OS and many guest virtual OSs. Although I have 8GB of RAM, I notice a slowdown when I turn some virtual machine on (and it takes only 1GB RAM). I was told that I should move virtual machine hard disk file to a separate (another) physical hard drive in my PC to get better performance. This way the head of the hard disk would not have to jump from the virtual OS to the host OS as each hard drive would have its own head to deal with the OS: hard drive 1 head for host OS and hard drive 2 head for guest OS. Is this true? Should I get another hard disk only for virtual machine hard disk files?

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• How is memory allocated in ESXi server?

  - by Samselvaprabu

  We have an ESXi 4.1 server with 48 GB RAM. For each VM, we are allocating 4GB of memory. Since the server will have 13 virtual machines, my manager thinks this is wrong. I am going to explain to them that ESXi will actually manage memory itself, but they asked me how much memory I allocated for the ESXi server itself. I did not allocate any (I have not even heard of an option for allocating memory for the ESXi server itself). How is memory allocated for ESXi server? How does it over-allocate/distribute RAM among virtual machines without issue?

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• Virtualizing OpenSolaris with physical disks

  - by Fionna Davids

  I currently have a OpenSolaris installation with a ~1Tb RaidZ volume made up of 3 500Gb hard drives. This is on commodity hardware (ASUS NVIDIA based board on Intel Core 2). I'm wondering whether anyone knows if XenServer or Oracle VM can be used to install 2009.06 and get given physical access to the three SATA drives so that I can continue to use the zpool and be able to use the Xen bits for other areas. I'm thinking of installing the JeOS version of OpenSolaris, have it manage just my ZFS volume and some other stuff for work(4GB), then have a Windows(2GB) and Linux(1GB) VM (theres 8Gb RAM on that box) virtualised for testing things. Currently I am using VirtualBox installed on OpenSolaris for the Windows and Linux testing but wondered if the above was a better alternative. Essentially, 3 Disks - OpenSolaris Guest VM, it loads the zpool and offers it to the other VMs via CIFS.

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• KVM error with device pass through

  - by javano

  I am running the following command booting a Debian live CD passing a host PCI device to the guest as a test and KVM errors out; kvm -m 512 -boot c -net none -hda /media/AA502592502565F3/debian.iso -device pci-assign,host=07:00.0 PCI region 1 at address 0xf7920000 has size 0x80, which is not a multiple of 4K. You might experience some performance hit due to that. No IOMMU found. Unable to assign device "(null)" kvm: -device pci-assign,host=07:00.0: Device 'pci-assign' could not be initialized lspci | grep 07 07:00.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Tornado] (rev 74) I shoved an old spare NIC into my motherboard to test PCI pass through. I have searched the Internet with Goolge and found that errors relating to "No IOMMU found" often mean the PCI device is not supported by KVM. Does KVM have to support the device being "passed-through"? I though the point was to pass the device through and let the guest worry about it? Ultimately I want to pass-through a PCI random number generator, is this not going to be possible with KVM? Thank you.

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• RDP for High DPI Monitors?

  - by Joey

  A client is having some problems with their laptop. They use RDP to remote into their work PC, but the laptop they are using is a small 13" Sony Vaio laptop, but with 1920x1080 resolution. Everything is pretty small on the laptop anyway, but the problem is much worse after connecting with RDP, where everything is almost unreadable. I have done the obvious with changing the resolution on the server, the RDP size, forced scaling on the terminal server etc, but nothing has worked. Something else which I would normally do is change the laptop resolution to something a little lower, but the laptop only has 2 resolution settings, the big one, and a 1024x768 (wrong ratio). Any ideas?

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• IPv6 Routing / Subnetting

  - by nappo

  Recently I have installed Citrix Xen Server 6.2 on a machine. My Provider (Hetzner) gave me the IPv6 Subnet 2a01:4f8:200:xxxx::/64. Followed an article in the providers wiki (1) i got it working and can assign IPs to my guests (CentOS). However i can't assign a second IP to a single guest - it will result in a timeout. I'm not very familiar with IPv6 routing / subnetting - any help or tips for further troubleshooting is welcome! My Setup: XenServer 6.2 IPv6: 2a01:4f8:200:xxxx::2/112 ip -6 route: 2a01:4f8:200:xxxx::/112 dev xenbr0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0 fe80::1 dev xenbr0 metric 1024 mtu 1500 advmss 1440 hoplimit 0 default via fe80::1 dev xenbr0 metric 1024 mtu 1500 advmss 1440 hoplimit 0 Guest 1 IPv6: 2a01:4f8:200:xxxx::3/64 IPv6: 2a01:4f8:200:xxxx::4/64 ip -6 route: 2a01:4f8:200:xxxx::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 default via fe80::1 dev eth0 metric 1 mtu 1500 advmss 1440 hoplimit 4294967295 Guest 2 IPv6: 2a01:4f8:200:xxxx::5/64 Guest 1 IPv6 is working fine, Guest 2 too. As suggested by the wiki article (1) i split my /64 network into a /112. Is it right to set the host /112 and the guests /64? Why is that?

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• double-click does not open the default program

  - by Chang

  I installed Ubuntu 12.04, with texlive-full and texworks. When I double-click a .tex file in Nautilus, it pops up a Do you want to run "xxxxxxxx.tex", or display it contents? "xxxxxxxx.tex" is an executable text file. Run in Terminal Display Cancel Run If I choose Display, it opens texworks. How can I make it open without seeing the above conversation window? By the way, is .tex file indeed an executable file? ADDED Just for the case, my ~/.local/share/applications/mimeapps.list file looks like the following: [Default Applications] text/html=google-chrome.desktop x-scheme-handler/http=google-chrome.desktop x-scheme-handler/https=google-chrome.desktop x-scheme-handler/about=google-chrome.desktop x-scheme-handler/unknown=google-chrome.desktop text/x-tex=texworks.desktop x-scheme-handler/mailto=google-chrome.desktop [Added Associations] text/x-tex=texworks.desktop; text/x-bibtex=jabref.desktop;gedit.desktop; I observe texworks are both up and down. Should I remove one? ADDED This does not happen with all .tex files. In fact, I am currently using Ubuntu 12.04 under Virtual Box with Windows 7 host. I have my Dropbox account synced with the Windows 7 host, and I access files in Dropbox in Ubuntu through Virtual Box's shared folder functionality. (I didn't install Dropbox client in Ubuntu.) Files in Dropbox are owned by root with group vboxsf. My personal account is in the group vboxsf. It seems that I have to uncheck the option for "executable", but I have all my .tex files in the Dropbox shared folder. Would there be any workaround?

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• Is there a way to exclude a specific drive vdi from "snapshots" in VirtualBox?

  - by Graza

  ...or is there another space-efficient way of dealing with the page/swap file of the Guest O/S? I've realised that its quite possible/likely that one of the things which "bloats" the snapshot/diff vdi's when a snapshot is taken is the guest operating system's pagefile. For example, say I have a 2Gb swap-file in a Windows guest OS, and over the course of a few weeks the usage of the swap file has gone over 1Gb a couple of times. When I next create a snapshot, it seems likely that I'd be almost guaranteed around 1Gb of space taken up in the new differencing disk just because of changes in the swap file. Obviously (provided I never did "live" snapshots on running or paused machines, and only ever did them when the machine was shut down), I would not need any of the information in the swap file to be saved. So this would simply be a waste of 1Gb. I'm wondering if there's a way to attach a vdi to a VM and flag it as "exclude from snapshots" - which would mean I could put the swap file on a different vdi which would never be included in a snapshot. Or if anyone has any other suggestions. Or an explanation about why it might not be an issue. I could obviously delete and recreate a swap drive vdi every time I did a snapshot to achieve the same effect, but this is a little more effort than simply clicking "create snapshot"....

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• Bridge and OpenVPN with shorewall

  - by Javier Martinez

  I have this scenario and everything it's working OK, but I want to configure my Shorewall and I can't do it. My interfaces are: br0 (bridge of eth0) tun0 (OpenVPN) vnet* (each one of bridged interfaces with public IP's) Public Main IP: 188.165.X.Y OpenVPN IP's: 172.28.0.x Bridge: public ip's So, I have the next configuration for shorewall: /etc/shorewall/zones #ZONE TYPE OPTIONS IN OUT # OPTIONS OPTIONS fw firewall inet ipv4 road ipv4 /etc/shorewall/interfaces #ZONE INTERFACE BROADCAST OPTIONS inet br0 detect routeback road tun+ detect routeback /etc/shorewall/policy #SOURCE DEST POLICY LOG LIMIT: CONNLIMIT: # LEVEL BURST MASK $FW all ACCEPT inet $FW DROP info road all DROP inet road DROP /etc/shorewall/tunnels #TYPE ZONE GATEWAY GATEWAY # ZONE openvpnserver:1194 inet 0.0.0.0/0 The problem is that even with shorewall running I am able to ping or connect to the virtual machines behind the bridge

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• How to keep time on resumed KVM guest with libvirt?

  - by Hristo Hristov

  On my host I am using libvirt and a KVM guest. When the host is shutting down, libvirt suspends the guest. When the host is starting up, libvirt resumes the guest. The problem is, if the guest is suspended and resumed after 24 hours for example, then the guest time is 24 hours in the past. I thought that maybe the problem is with the clocksource, but it is set to "kvm-clock" already. $ cat /sys/devices/system/clocksource/clocksource0/available_clocksource kvm-clock tsc hpet acpi_pm $ cat /sys/devices/system/clocksource/clocksource0/current_clocksource kvm-clock

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• Ubuntu snap-to-edge feature for XP

  - by Wesley

  Hi all. I am running Windows XP SP3 dual booting with Ubuntu 9.10. I really like the snap to edge feature of Ubuntu and wondered if you could get that feature in XP. This would basically prevent any windows from straying from the workspace and would allow windows to snap to the edges of the screen and to the edges of other windows. Thanks in advance!

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• Can I upgrade Lucid to Precise with the 12.04.1 desktop image?

  - by rahmad ars

  I am running Ubuntu Lucid and would like to upgrade to Precise, using the normal ubuntu-12.04.1-desktop-...iso image. So far I have tried upgrading with the CD but was not given the choice. Searching on the internet, I have found upgrading using the ubuntu-12.04.1-alternate-...iso image works, but I don't have great internet access. Is upgrading from Lucid possible, with the ubuntu-12.04.1-desktop image?

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• Keeping rackspace vserver alive

  - by mit

  It appears to me that rackspace somehow freezes cloud VMs after some idle time. This means the first page request to a php page takes much longer to respond than the subsequent requests. I am actually querying a machine with wget from a different host now to keep it "alive". But I wonder what frequency would be necessary. Does anyone know the time period after which they send a VM to "sleep"? I guess it would be some minutes. EDIT: There is no caching involved on the php site. It just recently moved from another vhost and there was never such latency on the first request.

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• What can I use to create a Virtual Image from an existing linux installation?

  - by Bozojoe

  I have a debian headless server that I need to migrate to run as a virtual server on Windows 2008. What tools can I use to image the existing debian installation? System I need to image: Debian Targeted host Platform: Microsoft Hyper-V

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• non-GUI connection to local Hyper-V VM without network

  - by sandro

  I have a virtual machine on Hyper-V manager (Windows 2008 R2) without a network configured on the VM. From a powershell script running on the host Windows server, I would like to query into the OS of that local VM for certain information (i.e. if a given process has finished completion). I am using codeplex's pshyperv module (https://pshyperv.codeplex.com/) to interact with Hyper-V manager, but the only cmdlet to connect to the vm is 'New-VMConnectSession', which launches a 'vmconnect.exe' connection to the VM. Since vmconnect.exe is essentially RDP, this is not very script-friendly. From within a host's powershell script, is there any way to send a command to a local virtual machine's OS and receive output, if no network is configured on the VM? (I believe Vmware's 'vmrun' utility has this capability) Another way to ask this question: Does Hyper-V have a non-GUI-based form of vmconnect.exe? (PS. Not sure if this was more stackoverflow or serverfault)

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• VMWare guest OS is not using full hard drive space

  - by syuusuke

  Hey everyone, I'm wondering if you can give me some insight on how to figure this out. I've recently virtualized a w2k3 server that had 10GB C:\ drive size. Once I finished virtualizing it, I expanded the disk to 20GB for C:\ and within guest OS (W2K3) computer management settings, you can see it recognizes as 20GB partition C:. But for some reason, if I opened windows explorer and see the properties of C:\, it will only show total size of 10GB. Does anyone know how to solve this or even had this problem before?

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• Virsh: Different XML with edit than dumpxml. Why?

  - by Dave Vogt

  I'm trying to fetch the VNC access data from a virtual machine managed by libVirt. However, when I run virsh dumpxml $machine, the vnc passwd is missing: <graphics type='vnc' port='-1' autoport='yes'/> Checking the same using virsh edit $machine, I see the password is actually there: <graphics type='vnc' port='-1' autoport='yes' passwd='asdf'/> Why is this? Is this intentional (what reason?), or could this be a bug?

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• Issue with multiple bridging for KVM hosts

  - by Henry-Nicolas Tourneur

  I'm using KVM and libvirt on my host (Debian lenny) + 2 bridges per guest (one for mgmt, one for public traffic). That setup isn't stable at all, sometimes I can do pings to a management ip, sometimes not. I don't know if my bridging paramateres are correct, could you check ? or if there is anything wrong ... Please also note that interface on guest doesn't flap and that I got not logs on my host. Of course forwarding is enabled. iface eth3 inet manual auto bond0 iface bond0 inet manual slaves eth1 eth2 pre-up ip link set bond0 up down ip link set bond0 down auto br0 iface br0 inet static address 10.160.0.7 netmask 255.255.255.128 bridge_ports eth3 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off auto br0:1 iface br0:1 inet static address 10.160.0.9 netmask 255.255.255.128 auto br0:2 iface br0:2 inet static address 10.160.0.10 netmask 255.255.255.128 auto br1 iface br1 inet static address 217.4.40.242 netmask 255.255.255.240 gateway 217.4.40.241 pre-up /etc/network/firewall start bridge_ports bond0 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off auto br1:1 iface br1:1 inet static address 217.4.40.252 netmask 255.255.255.240 auto br1:2 iface br1:2 inet static address 217.4.40.253 netmask 255.255.255.240

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• How do I find a file that begins with a phrase in Windows Search?

  - by plasmuska

  Hi Guys, What is the syntax for searching a file with file name that STARTS with a certain phrase? Example: I have two files: 60933 blahblah.xls PZ 60933 blahblah.xls I would like to search only for the first one but Windows Search always returns two results. I have tried these but none of them seem to work: filename:60933 filename:^60933* filename:60933..xls My setup: Windows XP Pro CZ, Windows Search 4, files are located on indexed network share.

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• How to extend a Linux PV partition online after virtual disk growth

  - by Yves Martin

  VMware allows to extend the size of a virtual disk online - when the VM is running. The next expected steps for Linux system are: extend the partition: delete and create a larger one with fdisk extend the PV size with pvresize use free extents for lvresize operations and then resize2fs for file system But I am stuck on the first step: fdisk and sfdisk still display the old size for the disk. My disk is a SCSI virtual disk connected thanks to the virtual LSI Logic controller. How to refresh the virtual disk size and partition table information available in Linux kernel without reboot ? As far as I know all that steps are possible for a running Windows, without reboot and even without any user actions thanks to VMWare tools. On Linux, I expects to do all steps online too and I already know steps 2, 3 and 4 work online. But the first one - change partition size declared in the partition table (still) seems to require a reboot. Update: My system is a Debian Lenny with kernel 2.6.26 and the disk I have extended is the main disk with a large PV containing the "root" LV for "/".

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• kvm -net only passing broadcast, multicast, and guest destination traffic

  - by user52874

  Figured this out just last week, but I can't find it now. Even printed it out. Can't find that either. Frustrating...so...help! Configured a 'monitoring' nic on a kvm guest (running 'Security Onion, if it matters). I read (somewhere) that the default nic configuration for a kvm guest is to only pass broadcast traffic, multicast traffic, and traffic with the guest's mac as a destination. There is an option to override this behaviour, and pass all traffic. It's something like --mac-filtering=no, or --mac-restriction=no, or something like that. Worked beautifully. Does this look at all familiar to anyone who can clue me in to the exact option syntax? thx.

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• OpenVSwitch and Virtualbox configuration

  - by Newbie

  I am trying to setup a lab network with OpenVSwitch (Virtual L3 Switch). I want to connect my 3 Virtualbox guest machines (running Debian 6) using OpenVSwitch. But, confused as what should I do first and how should I do this. I mean should I install OpenVSwitch on my VM or on my host machine? If I install on my host machine, then should I make to connect to my VMs. OR If I install OpenVSwitch on one of my VM, then how to connect the rest of the VMs to virtual switch. I know, there is option to connect internal networks in virtualbox, but I a want L3 switch to interconnect my VLANs. Can someone guide me here. Please & Thank you.

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• How to disable CDROM for normal users in linux ?

  - by nitins

  As a part of security policy we need to disable CDROM access for normal users. Only root users should have the access. We are mainly using Ubuntu Linux.

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