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• Would You Swim Laps in Lake Baikal?

  - by rickramsey

  source This is the lake where Yuli Vasiliev's countrymen swim laps. Yuli is one of my favorite OTN writers not just because he really knows his stuff. Not just because his writing is clear and accurate. And not just because his English is better than the English of most native speakers. Yo, those are all good reasons. But it's the Lake Baikal thing. Yuli recently wrote two wicked good how-to's about Oracle VM Templates. You should read them. You might gain a gram of Yuli's respect. Two grams, if you can head butt icebergs while you swim. How to Use Oracle VM Templates How to prepare an Oracle VM environment to use Oracle VM Templates, how to obtain a template, and how to deploy the template to your Oracle VM environment. Also how to create a virtual machine based on that template and how you can clone the template and change the clone's configuration. How to Use Oracle VM VirtualBox Templates How to use Oracle VM VirtualBox Templates in Oracle VM VirtualBox. Similar to the article above, but it describes how to download, install, and configure the templates within Oracle VM VirtualBox, instead of on bare metal. Other OTN Technical Articles by Yuli Vasiliev Retrieving, Transforming, and Consolidating Web Data with Oracle Database Setting Up, Configuring, and Using a WebLogic Server Cluster Cube Development for Beginners How to XQuery Non-JDBC Sources from JDBC Advanced Dimensional Design with Oracle Warehouse Builder Using the JDBC Connectivity Layer in Oracle Warehouse Builder High Performance Oracle JDBC Programming Python Data Persistence with Oracle Querying JPA Entities with JPQL and Native SQL - Rick Website Newsletter Facebook Twitter

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• KVM guest disk performance

  - by Alex

  My KVM guest does max. 200MB/s although the host does easily 700MB/s (Raid 0 with 4 SSDs). Configuration: File-based storage (raw), cache none. Host 24 cores, 96GB ram, Ubuntu 12.04.1 LTS and virt-manager. I suspect the CPU to be the bottleneck (one core goes up during hdparm). Anyone experienced the same or has an explanation ? Edit: one more info: guest is the same as host (Ubuntu 12). Same poor disk performance observed with Windows 2008 R2 and Suse Enterprise Linux (9 or 10 I think). Max 1 guest running.

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• Will You Survive The Undead Apocalypse? [Action Flow-Chart Wallpaper]

  - by Asian Angel

  Think you would know what to do if the zombie apocalypse happened today? This awesome flow-chart from Game Informer can help you make the right decisions based on your location or time period! Note: Click on the image embedded in the post to view and download the full-size (2500*1763 pixels) wallpaper. Will You Survive The Undead Apocalypse? [Game Informer] HTG Explains: What The Windows Event Viewer Is and How You Can Use It HTG Explains: How Windows Uses The Task Scheduler for System Tasks HTG Explains: Why Do Hard Drives Show the Wrong Capacity in Windows?

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• Static IP Address on Ubuntu 12.04 Virtual Machine

  - by chrisnankervis

  I've setup a VM running Ubuntu 12.04 specifically for local web development and am having some problems ensuring it has a static IP address. A static IP address is important as I'm using the IP address in my hosts file to assign a .local suffix to addresses used both in browser and to connect to the correct database on the VM. Currently, every time I connect to a new network or my VM is assigned a new IP address I need to reconfigure my whole environment which is becoming quite a pain. It also probably doesn't help that the default-lease-time on the Ubuntu VM is set to 1800 by default. At the moment I'm using VMWare Fusion and the Network Adapter is enabled and set to "Autodetect" under Bridged Networking. I've tried to set a static IP address within the dhcpd.conf using the code below: host ubuntu { hardware ethernet 00:50:56:35:0f:f1; fixed-address: 192.168.100.100; } The fixed-address that I've used is also outside the range specified in the subnet block (which in this case is 192.168.100.128 to 192.168.100.254). I've tried adding and removing the network adapter and restarting my Mac after each time to no avail. Below is an ifconfig of the VM that might be of some help: eth0 Link encap:Ethernet HWaddr 00:50:56:35:0f:f1 inet addr:192.168.0.25 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fe35:ff1/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1624 errors:0 dropped:0 overruns:0 frame:0 TX packets:416 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:147348 (147.3 KB) TX bytes:41756 (41.7 KB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Are there any specific issues with 12.04 that I'm missing? Otherwise has anyone else got any ideas? Thanks in advance.

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• Cannot Boot Win XP or Ubuntu from hard drive - get Input Not Supported

  - by Jim Hudspeth

  1) Downloaded 11.10 ISO file to Dell XP Workstation 2) Made bootable USB using Pendrivelinux 3) Installed to harddrive using option 1 (Install along side Windows) 4) Rebooted when instructed 5) Booted into Ubuntu just fine (first time) 6) Attempted restart - got first splash screen followed by "input not supported" - tapped ESC and eventually got into Ubuntu 7) Later attempts failed - got "input not supported"; no eventual boot 8) Many retries holding / tapping various keys - same result 9) Booted from USB - all files appear to be in place - can access GRUB on harddrive Suggestions appreciated - must to be able to boot XP. Thanks in advance

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• Why does linux-image-virtual depend on a generic kernel now?

  - by ændrük

  The linux-image-virtual metapackage has historically provided a kernel that is specifically designed for use in virtual machines: Ubuntu 8.04: linux-image-2.6.24-32-virtual Ubuntu 10.04: linux-image-2.6.32-44-virtual Ubuntu 11.10: linux-image-3.0.0-26-virtual Ubuntu 12.04: linux-image-3.2.0-32-virtual Apparently, this has now changed: Ubuntu 12.10: linux-image-3.5.0-17-generic What's the explanation? Is this still the correct kernel to use in a virtual machine?

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• Friday Tips #6, Part 2

  - by Chris Kawalek

  Here is a question about updating Oracle VM: Question: How can I perform Oracle VM 3 server updates from Oracle VM Manager? Answer by Gregory King, Principal Best Practices Consultant, Oracle VM Product Management: Server Update Manager is a built-in feature of the Oracle VM Manager. Basically, Server Update Manager automatically configures YUM updates on all the Oracle VM Servers, pointing each to our Unbreakable Linux Network (ULN) update channel for Oracle VM. The servers periodically check with our Oracle YUM repository and notify the Oracle VM Manager that an update is available for each server. Actual server updates must be triggered by the Oracle VM administrator – they are not executed automatically. At this point, you can use the Oracle VM Manager to put a server into maintenance mode which live migrates all the running Oracle VM Guests to other Oracle VM Servers in the server pool. Once all the Oracle VM Guests have been migrated, the Oracle VM administrator can trigger the update on the server. The entire process is documented in the Installation and Upgrade Guide of Oracle VM Documentation so I won’t spend time detailing the steps. However, configuring the Server Update Manager is exceedingly simple. Simply navigate to the Tools and Resources tab in the Oracle VM Manager, select the link for Server Update Manager and ensure the following values are added to the text boxes as shown in the illustration below: YUM Base URL: http://public-yum.oracle.com/repo/OracleVM/OVM3/latest/x86_64 YUM GPG Key: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle Every server in the pool will be automatically configured for YUM updates once you choose the Apply button. Many thanks to Greg and Rick for providing the answers to this week's questions. If you want to ask us something, hit up Twitter and use hashtag #AskOracleVirtualization. See you next week! -Chris 

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• Optical Character Recognition software recommendations?

  - by Tim

  I have seen some ebooks/papers that were apparently scanned from their paper versions but the text in the ebooks/papers can amazingly be copied out. I suppose the directly-scanned versions must have been processed by some Optical Character Recognition software. So I would like to know what are the recommended Optical Character Recognition softwares? Especially those that are either for Ubuntu or free? If those for Windows are far more superior, please let me know as well. I am particularly interested in those OCRs that can accept a scanned pdf file as input and still produce as output another pdf file that looks the same as the input one but with its text copyable. Thanks and regards! Please limit one software per answer

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• virtual install from ISO not getting virtual kernel

  - by Pete

  I have a KVM host (12.04.5) that I have been installing guests on in variety of ways. I just noticed recently one of my guests was running a generic kernel when I'm fairly certain I specified minimum virtual machine during install from a 12.04.2 server iso. From what I understand it should be running a stripped down kernel "optimized" for VMs. I set up another server to test, this time using a 14.04.1, and sure enough I ended up with uname -r returning 3.13.0-32-generic. It seems that if I use an .iso to install, I end up with generic regardless. However building with the vmbuilder ... --flavour virtual --suite precise ... (I don't have trusty available yet) script gives me an ubuntu 12.04.5 LTS system running kernel 3.2.0-67-virtual. The server FAQ mentions I should be getting the virtual kernel. What are practical advantages of using linux-image-virtual kernel? gives me the impression that it doesn't really matter functionally (in my case I only have a couple VMs running). I first thought was maybe I was somehow not applying the correct options because the installer F4 menu doesn't really give great feedback if the mode has been selected or not. Looking in the log /var/log/installers/syslog I see Command line: file=/cdrom/preceed/ubuntu-server-minimalvm.seed ... I know that I can install the virtual kernel package down the road, but why am I not, or should I be getting the virtual flavor of kernel from an ISO install when doing an minimum VM install?

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• Why would more CPU cores on virtual machine slow compile times?

  - by Sid

  [edit#2] If anyone from VMWare can hit me up with a copy of VMWare Fusion, I'd be more than happy to do the same as a VirtualBox vs VMWare comparison. Somehow I suspect the VMWare hypervisor will be better tuned for hyperthreading (see my answer too) I'm seeing something curious. As I increase the number of cores on my Windows 7 x64 virtual machine, the overall compile time increases instead of decreasing. Compiling is usually very well suited for parallel processing as in the middle part (post dependency mapping) you can simply call a compiler instance on each of your .c/.cpp/.cs/whatever file to build partial objects for the linker to take over. So I would have imagined that compiling would actually scale very well with # of cores. But what I'm seeing is: 8 cores: 1.89 sec 4 cores: 1.33 sec 2 cores: 1.24 sec 1 core: 1.15 sec Is this simply a design artifact due to a particular vendor's hypervisor implementation (type2:virtualbox in my case) or something more pervasive across more VMs to make hypervisor implementations more simpler? With so many factors, I seem to be able to make arguments both for and against this behavior - so if someone knows more about this than me, I'd be curious to read your answer. Thanks Sid [edit:addressing comments] @MartinBeckett: Cold compiles were discarded. @MonsterTruck: Couldn't find an opensource project to compile directly. Would be great but can't screwup my dev env right now. @Mr Lister, @philosodad: Have 8 hw threads, using VirtualBox, so should be 1:1 mapping without emulation @Thorbjorn: I have 6.5GB for the VM and a smallish VS2012 project - it's quite unlikely that I'm swapping in/out trashing the page file. @All: If someone can point to an open source VS2010/VS2012 project, that might be a better community reference than my (proprietary) VS2012 project. Orchard and DNN seem to need environment tweaking to compile in VS2012. I really would like to see if someone with VMWare Fusion also sees this (for VMWare vs VirtualBox compartmentalization) Test details: Hardware: Macbook Pro Retina CPU : Core i7 @ 2.3Ghz (quad core, hyper threaded = 8 cores in windows task manager) Memory : 16 GB Disk : 256GB SSD Host OS: Mac OS X 10.8 VM type: VirtualBox 4.1.18 (type 2 hypervisor) Guest OS: Windows 7 x64 SP1 Compiler: VS2012 compiling a solution with 3 C# Azure projects Compile times measure by VS2012 plugin called 'VSCommands' All tests run 5 times, first 2 runs discarded, last 3 averaged

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• Ubuntu 12.04 update + VirtualBox VM 4.1.14 r77440 - No input

  - by Gubatron

  I can only enter my password with the keyboard and this is what I see after I login If I try to switch to a terminal with CtrlAlt+F1 I get this I don't have a clue how to fix this, or if it's even possible to fix this without access to a terminal. The recovery console does not work either. It opens, but keyboard input doesn't seem to be working for it either. Anybody had this happened? Update (next day) Keyboard input lets me do Alt+F2 and invoke a terminal, but I can't change focus to the terminal window that opens. Any tip on how to switch focus (Alt+Tab wont work) to the terminal window. Maybe looking at this you might have a clue what's going on, maybe there's no window manager loading?

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• Computer Lab School for Orphans

  - by Brendon

  I am helping out an NGO, called Orphans Found Fund, here in Arusha Tanzania setup a computer lab to teach students about Ubuntu and open source applications. I have installed Ubuntu 10.10 on all the systems. What I'm wondering about is how to tweak the systems so that the kids cannot: Delete or alter system files Alter the system settings Add or remove applications Exceed a time limit (like an Internet Cafe) Also as the administrator I would like to monitor the usage for another system to make sure that abuse of network is not taking place. Any advice is much appreciated. Brendon

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• Dolphin search bar missing. How can i get it back?

  - by Ike

  A while ago, my search bar went missing in dolphin. If the search toolbar is checked for view/unhide, nothing shows up. I noticed if i check and uncheck the button to hide/unhide it, a small, thin content-less bar slightly pushes the rest of the toolbar up. i tried reconfiguring with dpkg, purging and reinstalling, etc. i left it alone as i thought it would be fixed in an update, but today i upgraded daolphin and it's still gone. any thoughts?

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• Can't install gimp-plugin-registry

  - by Uri Herrera

  I tried to install the Ubuntu Studio Graphics meta-package, however it didn't install correctly.The package gimp-plugin-registry just won`t install, i tried the one in the Software center and the one on the WebUp8 PPA neither package works. The following NEW packages will be installed: gimp-plugin-registry 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 0B/1395kB of archives. After this operation, 3592kB of additional disk space will be used. (Reading database ... 402557 files and directories currently installed.) Unpacking gimp-plugin-registry (from .../gimp-plugin-registry_3.2-1_i386.deb) ... dpkg: error processing /var/cache/apt/archives/gimp-plugin-registry_3.2-1_i386.deb (- -unpack): trying to overwrite '/usr/lib/gimp/2.0/plug-ins/file-xmc', which is also in package gimp 2.7.3-2010110501~mm dpkg-deb: subprocess paste killed by signal (Broken pipe) Errors were encountered while processing: /var/cache/apt/archives/gimp-plugin-registry_3.2-1_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1)

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• DockbarX inside AWN, preview window shifted on dual-screen after shifting from single-screen.

  - by naaronne

  I've been running dockbarx in AWN for sometime now. I started using dual-screens and started seeing a problem with the window preview. When I hover over the dockbarx icon to see the preview it appears on the other monitor. I'm assuming that this is due to it still thinking there is only one monitor. I was hoping someone new of a gconf-editor setting that I could set with the rest of my screen that changes my laptop from internal monitor to my dual-screen setup. Thanks in advance.

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• Hotkey to shut down from login screen?

  - by Skizz

  I used to run 9.04 on my server and used to be able to use Alt-T, Alt-S to shut the system down from the login screen. It was using a KDE login screen. Now I've upgraded to 10.04 and use the Gnome login screen and I can't see any keyboard shortcuts to shutdown the server. Is there a shortcut and if so, what is it? Further info - I would normally shut down the server without turning on the monitor, which was easy using the keyboard shortcuts. Doing it with a mouse is not so easy without the monitor being on.

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• Ubuntu - prettier bootloader

  - by Matthew

  I hate how when I turn on the computer it just (after the hp logo, which I hate having also), shows white text on a black background. I'm wondering if there's easy ways to customize this (I'm choosing between Windows 7 and two separate Ubuntu 10.10 installs). I've read a little about some complicated ways to do this, but is there not some simpler ways by installing a package on ubuntu or something? I don't want to hack a bunch of code together to get a simple effect. I'm hoping for actual images and having like the windows 7 logo and ubuntu logo to choose from. Ideas?

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• virt-install says name is in use, but virsh list --all is empty. Where is virt-install finding this name?

  - by Jay _silly_evarlast_ Wren

  virt-install says name is in use, but virsh list --all says there is nothing. jrwren@delays:{%22}~ $ virt-install -d -n android -r 512 --disk android.qcow2 -s 4 -c /d/cd\ images/android-x86-2.2-generic.iso --vnc --noautoconsole [Thu, 05 Jul 2012 16:57:19 virt-install 23170] DEBUG (cli:220) Launched with command line: /usr/bin/virt-install -d -n android -r 512 --disk android.qcow2 -s 4 -c /d/cd images/android-x86-2.2-generic.iso --vnc --noautoconsole [Thu, 05 Jul 2012 16:57:19 virt-install 23170] DEBUG (cli:326) Requesting libvirt URI default [Thu, 05 Jul 2012 16:57:19 virt-install 23170] DEBUG (cli:328) Received libvirt URI qemu:///session [Thu, 05 Jul 2012 16:57:20 virt-install 23170] DEBUG (virt-install:259) Requesting virt method 'default', hv type 'default'. [Thu, 05 Jul 2012 16:57:20 virt-install 23170] DEBUG (virt-install:469) Received virt method 'hvm' [Thu, 05 Jul 2012 16:57:20 virt-install 23170] DEBUG (virt-install:470) Hypervisor name is 'kvm' [Thu, 05 Jul 2012 16:57:20 virt-install 23170] DEBUG (cli:950) --graphics compat generated: vnc [Thu, 05 Jul 2012 16:57:20 virt-install 23170] ERROR (cli:597) Guest name 'android' is already in use. (venv)jrwren@delays:{%22}~ $ sudo virsh -c qemu:///system list --all Id Name State ---------------------------------- Where is virt-install finding this name? edit: I should mention that LIBVIRT_DEFAULT_URI is not set.

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• How do I make my volume indicator operate in decibels instead of percentage?

  - by ethana2

  When I want to adjust the volume of anything I'm doing, I find that using the volume controls built into Ubuntu is little but confusion. When the volume is around 100%, dropping it several increments has almost no effect on apparent volume, but when it's around 0%, the effect of one click of my mouse wheel is probably a good 3 decibels. I have observed this behavior on tens of different UC's, since I convert about one Ubuntu user a month (NE team contact). This has proven so frustrating to me that I tend to use the volume knob on my guitar amp ( mono audio :| ) instead of the volume indicator. What can I do to make my volume indicator behave properly until this is fixed? I want each volume increment to be one half or one third decibel. Is there a different piece of software I should use for system volume configuration perhaps?

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• Why can't I install Windows 8 in Virtualbox on 12.04? [closed]

  - by The_Ubuntu_Kid

  I recently tried to install Windows 8 RP 32-bit in Virtualbox using Ubuntu 12.04 as the host. I have tried multiple settings for memory, hard drive size, etc. Every single time it has come up with this error Your PC needs to restart. Please hold down the power button Error code: 0x0000005D Parameters: 0x0306170A, 0x756E6547, 0x49656E69, 0x6C65746E I really like windows 8 and I would like to know how to fix this some time soon.

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• Windows Server 2008 in KVM

  - by Joseph

  I've been working on getting a Windows Server 2008 KVM in my linux box running Ubuntu Server 12.04. I've got virt-install and virt-manager installed, got the install up and running via virt-install --connect qemu:///system -n winsvr2008 -r 1024 --vcpus=1 --disk path=/home/pwnd/vm/2008.img,size=30 -c /home/pwnd/en_windows_server_2008_with_sp2_x86_dvd_342333.iso --graphics vnc,listen=192.168.1.127 --noautoconsole --os-type=windows --os-variant=win2k8 --network=bridge:virbr0 --hvm -v and virsh vncdisplay winsvr2008 I can connect and view, but upon starting, I get hung up on please wait right after clicking Install. Any ideas?

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• Incorrect key mappings in remote NX session

  - by Roger Light

  I'm using the NoMachine provided NX client on Ubuntu 10.10 running on a laptop. I'm connecting to a FreeNX server that happens to be running on openSUSE. I'm having trouble with keys being incorrect in the remote session. The most noticable example is that when I press up cursor, the screen shot dialog appears instead. As far as I can gather easily, the cursor keys and delete are affected. It's worth noting that it doesn't display the same behaviour if I dual boot to Windows XP, or from a different machine using openSUSE. I'm not really sure where to begin looking. Any suggestions?

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• Why does 12.04 freeze when using multiple desktops?

  - by Dustin

  I am using 12.04 32-bit, upgraded from 11.10. Within the last week and a half Unity has hung on me with no option but a hard reboot, which I hate. It usually happens when I am using multiple desktops and applications and switching desktops. The screen just hangs, sometimes broken between desktops and applications, I can move my mouse but cannot click on anything. alt+f2 , HUD , super+w/s/d and alt+tab/~ does nothing, they do not activate. I let it rest for 15-20 minutes in hopes it will sort itself out but nothing. I'd hate to move to Unity 2D, but I can't risk having to do hard reboots/shutdowns, or moving to a different DE. Other information: the only PPA's I have added recently would be the word lens. 2.8GB RAM processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 127 model name : AMD Sempron(tm) Processor LE-1250 stepping : 2 microcode : 0x83 cpu MHz : 1000.000

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• Field of Poppies Wallpaper

  - by Asian Angel

  Poppies Field [DesktopNexus] Latest Features How-To Geek ETC Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions How to Enable User-Specific Wireless Networks in Windows 7 Access the Options for Your Favorite Extensions Easier in Firefox Don’t Sleep Keeps Your Windows Machine Awake DropSpace Syncs Android Files to Dropbox Field of Poppies Wallpaper The History Of Operating Systems [Infographic] DriveSafe.ly Reads Your Text Messages Aloud

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• How Can I Run Legacy Versions of Internet Explorer on Windows 8?

  - by Jason Fitzpatrick

  You’re sporting the newest edition of Windows but you need an older edition of Internet Explorer? Read on to see how you can wrangle a vintage browser into a modern operating system. Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. How To Delete, Move, or Rename Locked Files in Windows HTG Explains: Why Screen Savers Are No Longer Necessary 6 Ways Windows 8 Is More Secure Than Windows 7

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