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  • What are optimal strategies for using mapreduce and other applications on the same server?

    - by user45532
    I have two applications that I need to run continuously to process data. 1.) An app that processes and aggregates information from sources 2.) A mapreduce workflow* that processes the above info I've thought about either getting vps hosting or getting my own inexpensive server and using xen to split the resources of the server. Getting a quad core box with 2 GB of Ram seems a lot cheaper than the grid options I've seen at slicehost, rackspace and others...

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  • How to let Linux Python application handle termination on user logout correctly?

    - by tuxpoldo
    I have written a Linux GUI application in Python that needs to do some cleanup tasks before being terminated when the user logs out. Unfortunately it seems, that on logout, all applications are killed. I tried both to handle POSIX signals and DBUS notifications, but nothing worked. Any idea what I could have made wrong? On application startup I register some termination handlers: # create graceful shutdown mechanisms signal.signal(signal.SIGTERM, self.on_signal_term) self.bus = dbus.SessionBus() self.bus.call_on_disconnection(self.on_session_disconnect) When the user logs out, neither self.on_signal_term nor self.on_session_disconnect are called. The problem occurs in several scenarios: Ubuntu 14.04 with Unity, Debian Wheezy with Gnome. Full code: https://github.com/tuxpoldo/btsync-deb/tree/master/btsync-gui

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  • How to automatically start VM created by virt-manager?

    - by Jeff Shattock
    I have created a virtual machine with virt-manager that runs on kvm/qemu. The machine works well when started through virt-manager. However, I would like to be able to start and stop the VM through a script in init.d, so that it comes up and down along with the host. I need to have virt-manager show that the machine is running, and to be able to connect to its console through there. When I use the command line that is produced by running ps -eaf | grep kvm after starting the vm through virt-manager, I get some console messages about redirected character devices, but the machine does start and runs properly. However, I do not get any indication from virt-manager that it has started. How can I modify the command line to get virt-manager to pick up the running VM? Is there anything else about the command line that should change when starting outside of virt-manager? Command line is (slightly reformatted for readability): /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 512 -smp 1 -name BORON \ -uuid fa7e5fbd-7d8e-43c4-ebd9-1504a4383eb1 \ -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/BORON.monitor,server,nowait \ -monitor chardev:monitor -localtime -boot c \ -drive file=/dev/FS1/BORON,if=ide,index=0,boot=on,format=raw \ -net nic,macaddr=52:54:00:20:0b:fd,vlan=0,name=nic.0 \ -net tap,fd=41,vlan=0,name=tap.0 -chardev pty,id=serial0 -serial chardev:serial0 \ -parallel none -usb -usbdevice tablet -vnc 127.0.0.1:1 -k en-us -vga cirrus

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  • Cloud hosting and single hardware point of failure?

    - by PeterB
    From talking to sales I thought Rackspace Cloud was running on a SAN and compute nodes (as VMWare's offerings do), only to find out it doesn't, so when the host server goes down for maintenance all cloud servers on the server go down (in our case for 2.5 hours). I understand Amazon EC2 also has this single-server point of failure. Which cloud hosting solutions don't rely on a single server? I've yet to find a list by architecture Is there a term that distinguishes between these types of 'cloud'? Is one of these 'grid computing' and the other 'virtualisation'? Can a SAN backed solution provide the same reliability as 2 mirrored cloud servers on (say) Rackspace Cloud? I am more familiar with the VMWare architecture and would like to understand the advantages and disadvantages of each approach. I understand the standard architecture is to have multiple cloud servers and mirrored data between them; until we need multiple database servers I'm wondering if a SAN/node hosting solution would provide the lack of downtime we need without the added complexity.

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  • Starting VM as an executable with as low overhead as possible

    - by Robert Koritnik
    Is there a solution to create a virtual machine and start it by having an executable file, that will start the machine? If possible to start as quickly as possible. Strange situation? Not at all. Read on... Real life scenario Since we can't have domain controller on a non-server OS it would be nice to have domain controller in an as thin as possible machine (possibly Samba or similar because we'd like to make it startup as quickly as possible - in a matter of a few seconds) packed in a single executable. We could then configure our non-server OS to run the executable when it starts and before user logs in. This would make it possible to login into a domain.

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  • How to copy VirtualBox VDI contents to a partition and dual boot the OS from it?

    - by Calmarius
    I'm a Linux user but I keep a compressed Windows XP ISO with me on a pen drive for the case I absolutely need Windows to do something. This works in VirtualBox most of the time. But now I want to play some games, so I would like to run the Windows image natively. My computer don't have CD drive so cannot just burn the ISO and make an install normally. What I trying to do is moving the installed Windows image to a physical NTFS partition on my HDD and set up GRUB to let me dual boot it. I found many tutorials that deal with making VDI to physical drive. But they assume I want to overwrite my entire drive. Moving the raw disk image with dd to the partition resulted in a corrupt partition. I also tried the VMDK trick to use that empty partition and install the Windows on it. Although the text mode phase of the installation finishes without problems, the VM won't work, either crashes and keeps rebooting or just immediately or freezes (depending on how I created the VMDK, with -rawdisk /dev/sda3 or -rawdisk /dev/sda -partition 3).

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  • Hyper-V VM's cannot access Host resources, and vice-versa

    - by Agent
    I have several Hyper-V vm's running on this Win2008 R2 Server box, and up until a reboot of the host server, all the VM's were able to access shared folders on the host. Now, they can't even ping the host server. From what I've seen, I need to setup an Internal only network through Virtual Network Manager in Hyper-V. I set this up, then tried to enable the Microsoft Virtual Network Switch Protocol option in this Internal Only NIC, but I get popups saying: Your current selection will also disable the following features: Microsoft virtual network switch protocol Which is absolutely stupid, considering the protocol is what I'm ticking the checkbox to Enable! As of now, on the host, I have 2 NICs: Physical - This NIC on the host machine does have the MVNS protocol enabled Virtual Network Adapter - Created through Hyper-V Virtual Network Manager as an External type of network. Trying to enable MVNS on this NIC also produces the error above. I've tried enabling Client for Microsoft Networks on the physical NIC for IPv6, but everytime I do that, all the VMs lose Internet connectivity and I cannot RDP into them. Anything else I can try?

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  • Deploying virtual machines - Windows Guest/Linux Host or vice versa?

    - by samoz
    I'm looking to deploy several virtual machines for users. They need access to both Windows and Linux. They also need to use the computers graphics card (for Photoshop, modeling, etc) under Windows. My question is, will an Ubuntu host/Windows guest or a Windows host/Ubuntu guest be faster? I'm somewhat worried about Windows getting a cluttered registry and slow, but on the otherhand, a Windows host would have direct access to hardware (Unless I'm just unaware of how to grant hardware access to a guest). Does the choice of software (VMware or VirtualBox) effect the choice?

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  • Windows 2008 R2 on ESXi 4.1 cpu utilization kernel high

    - by MK.
    I have a Win2k8 guest running on ESXi 4.1. The host has 12 cores and the problem happens even if the guest is the only VM on the host. We have 4 cores dedicated to the guest. We noticed that network starts chocking when the CPU load goes up. After some testing we noticed that when running a simple CPU hogging tool set up to run 3 threads at 100% the regular CPU load goes to 75% like it should and the "kernel times" graph in task manager goes up to 25%. My intuition tells me that the network problem and kernel times problem are the same. This is confirmed by another similar VM we created on the same host which doesn't have either of the problems. VMWare tools are obviously installed. The nic is e1000. What else can we do to troubleshoot this?

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  • Can I use VT-D with a windows host for a VM?

    - by Journeyman Geek
    I've got a fairly beefy gaming system that I also run occational virtual machines on. It runs windows 8 and the built in hyper V virtual machine software at the moment and has a core i7 3770 (which unlike the unlocked model, should support VT-D), an Asus P8Z77V and a gforce 660 video card(also asus). I figure that if I could use VT-D I could add a cheap dedicated 3d card for a VM, in case I wanted somewhat more than the 'basics'. I know KVM and Xen support this to some level on linux, but can I do so on windows? I'm open to switching VM software if need be.

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  • Is there an application to open links on another computer?

    - by kbyrd
    I'm connecting to another computer via RDP. I would like to click on links inside my RDP session and have the links open in a browser on my client computer. It feels like I could install some application on both ends and have them communicate over TCP and proxy the URL opening. Does something like this exist?

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  • VPN server on Windows Server 2008 for a small office

    - by cmbrnt
    I'm going to refurbish the IT-infrastructure for a small organization with one single office, and I'm not sure what VPN server to use. In your opinion, would the built-in Windows Server 2008 VPN server suffice or are there any specific problems with it as opposed to, for example, OpenVPN? I'd rather run a Windows native VPN server, but if there are few (preferably free) good alternatives, I could install VMware ESXi and virtualize both Windows and an OpenVPN-server. By the way, because of a low budget this office runs a solution with only one physical server. Any advice would be great to help me grasp this field of which I'm quite a novice. Thank you!

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  • Can not connect remotely to MySQL Server on Ubuntu 10.10

    - by BobFranz
    Ok I have searched google for two days trying to get this to work. Here are the steps I have taken so far: Clean install of Ubuntu 10.10 Install mysql 5.1 as well as admin Comment out the bind address in the config file Create a new database Create a new user that is username@% to allow remote connections Grant all access to this user to the new database EXCEPT the grant option Login on the server is ok using this new user and database on the localhost Login on the server is ok using this new user and database on the server internal network ip Login from a remote computer is ok using this new user and database using the internal network ip Login is not working when logging in with this username and database using the external ip address from the server or the remote computer. I have port forwarding enabled for this port and it is viewable from outside as confirmed by canyouseeme.org I have nmap'd using the following command on the internal ip and get the below result: nmap -PN -p 3306 192.168.1.73 Starting Nmap 5.21 ( http://nmap.org ) at 2011-02-19 13:41 PST Nmap scan report for computername-System-Name (192.168.1.73) Host is up (0.00064s latency). PORT STATE SERVICE 3306/tcp open mysql Nmap done: 1 IP address (1 host up) scanned in 0.23 seconds I have nmap'd using the following command on the internal ip and get the below result(I have hidden ip for obvious reasons): nmap -PN -p 3306 xxx.xxx.xx.xxx Starting Nmap 5.21 ( http://nmap.org ) at 2011-02-19 13:42 PST Nmap scan report for HOSTNAME (xxx.xxx.xx.xxx) Host is up (0.00056s latency). PORT STATE SERVICE 3306/tcp closed mysql Nmap done: 1 IP address (1 host up) scanned in 0.21 seconds I am completely stuck here and need some help. I have tried everything under the moon and still can not connect from a remote external ip address. Any help is greatly appreciated and I need to do anything to help find the problem let me know and I will post the results here.

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  • How to add a VM Server to a VM Domain when the host is not on that domain.

    - by Charlie
    I have created A VM running Windows Server 2008 R2, using VMWare. I have configured this as a domain controller running a Windows Server 2008 domain. I have also created another VM running Windows Server 2008 R2. The HOST machine is using Windows 7 Professional 64 bit. When I try to add the second VM into the domain that the first is the DC for it fails as the VM cannot contact the DC. Simple question really. What have I missed? Is it something to do with the configuration on the Host machine? What do I need to do to enable this scenario? Thanks

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  • Seeing double-cursor in 'recursive RDP'

    - by John
    I'm using a Virtual PC VM on my PC to connect to a remote PC using RDP over a VPN. It works just fine except that in the RDP session, I often see a double mouse cursor... I get a standard mouse-arrow and the context-specific cursor such as a caret or hourglass. It's not a big problem but rather annoying and I wondered if there's any way to fix it, or at least understand where it comes from? Is it because I'm effectively running one RDP session from inside another? My host PC runs W7, my local VM runs XP, and the remote PC access using RDP is W7. Thankyou for any help.

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  • Copy an Amazon EC2 Instance to use locally

    - by Excolo
    Ok, so we have a spare server I have installed Debian Wheezy on, and setup Xen on for virtual machines. It has better performance than all our ec2 instances combined, and will cost less to run (for a few various reasons) I would like to get the EC2 instances downloaded to my server, and converted to run for Xen, but im having difficulty finding anything specific. I did not setup the EC2 instances myself, and am not very familiar with them. Everything I have found (which isnt much) just says "Do XYZ" and I have no idea how to do those. So being as specific as possible would be helpful. Also, confusingly I see people writing in forums saying you can only export linux images (which mine are, Ubuntu images) but then I see on amazons export tool saying you can only export Windows server? Am I missing something here? Is that not the right place to be looking? Thanks

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  • Connect to vmware virtual machine via network

    - by Arnis L.
    I want to connect to my vmware vm from home. To work network i'm connecting through VPN. VM sits on one of the workstations (can connect to it through RDC). Any tips how to do that? What software do i need (got VMWare workstation atm)? p.s. i'm quite a newbie at this.

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  • Unable to SSH into ESXi 4.1 host - "Access Denied"

    - by Andrew White
    I am unable to SSH into an existing ESXi server. I have a user which is in the "root" and "users" group and is able to connect via vSphere. However after enabling "Remote support (SSH)", attempting to connect by putty and entering my username/password when prompted I am presented with an "Access Denied" message. I have run through the options presented at this KB article to no avail. I have taken down the firewall on the machine (it is remote) temporarily to check if this helped - no change. The username/password are definitely correct and I can obviously get connectivity if I am presented with the username/password prompt. I am at a bit of a loss what else I can try. Thanks all

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  • Hardware changes to require XP Activation ? (for a Virtual Machine)

    - by NVRAM
    I have WXP-64 running on a VM and, for testing and performance reasons, I would like to occasionally change the allocations for it. Changes might include: Number of CPU cores, Amount of RAM Add/remove network adapters. But I'm concerned that XP will demand re-activation and that I might eventually have licensing issues if I do this. So, can anyone tell me: What kind of changes trigger re-activation in XP? Is there limits or caveat with regard to re-activation? I've perused this question and the article it references, but wanted more recent and verified info. (FWIW, I'm not trying to cheat: the OS copy was purchased explicitly for the VM.)

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  • How do I replace the desktop by an application?

    - by Takkat
    Sometimes it may be needed that a user only has access to a certain application. Running the desktop environment then may be unwanted be it either for security reasons or for acchieving a better accessibility to the given application. In these cases it may be desired to replace the desktop by an application that runs immediately after login. Other users should have a normal access to their desktops.

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  • Moving windows on Windows like on Gnome (Alt+DnD)?

    - by Alois Mahdal
    Is there a hidden setting or an external utility that would enable moving windows on Windows like on GNOME? I'm particularly thinking of moving windows using Alt + Drag and drop (which can be changed to Win + drag and drop). I have machine with Windows (7) and two big monitors at work, and I tend to use multiple smaller windows. Moving them quickly around is essential, so I'm always missing this GNOME feature.

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