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Articles indexed Sunday February 27 2011

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• Can KVM roll back changes to Virtual Disks automatically?

  - by Cygon

  I'm currently using VirtualBox on my Linux server to run a small Windows guest OS. I've configured its main virtual hard drive as what VBox calls "Immutable" - meaning that any changes to it are written into a differencing image that is discarded when the system reboots. Can KVM do something similar? I've read about snapshots via "savevm", "loadvm" but I believe that's saved states, not differencing images. What I ultimately want is a VM with two drives: one reverts on each reboot, one keeps its changes. Ideally, the unchangeable drive image should be stored with only read access granted to the user running KVM.

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• Filtering semi-solicited spam

  - by Ketil

  While traditional UCE (get rich quick, enlarge your body parts, Nigerian barristers) are handled adequately, I'm still receiving a lot of not quite unsolicited spam. This is typically from commercial services forwarding "invites" from my "friends" and then "reminding" me of their services. Typical offenders are Facebook, Linkedin, dropbox, bebox, etc etc. (Of course, none of these services provide any way of opting out, except possibly by registering, which they will then take as an invitation to stuff your mailbox with even more crap) What is a good way to deal with these? I can of course junk them using procmail, but is it a better idea to e.g. bounce them, or at least send a reply informing the sender (and "friend") that I am not interested in their service nor their spam. Any solutions to this?

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• Moving Mail between Exchange Mail Queues

  - by Eli

  We have multiple Microsoft Exchange 2007 nodes and 2 Exchange hubs. One of our users unfortunately had their account compromised, which then sent out several thousand emails before we were able to stop them. During this time, however, several primary mail providers blocked one of our Exchange hubs as a spam source. We now have nearly 500 messages built up on the one hub server waiting to go out to a provider who is currently blocking that hub. I know it is possible to change the location of the mailqueue and I could copy the queue database over from one hub to another and than change the location the HUB is looking at to a different file - let the mail spool out and then change the location back, but I would like a cleaner solution. Therefore, the question: is there a way to quickly and easily move messages from one Exchange hub server to another Exchange hub server?

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• Standalone tool to synchronize two folders in windows?

  - by Jim

  I keep data on a USB drive, but I also keep a copy of all of that data on a hard disk. I like using the hard disk because it's faster and gives me a backup. What standalone tools would work to keep the files on the disk and USB drive in sync? I'd like a single command line executable or standalone GUI app that can do the job--something I could run off of the USB drive. So, things like the MS Sync Tool wouldn't work.

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• Servicing a WIM image with the recently released SP1 for Windows 7/Server 2008 R2

  - by noonand

  Hello, I normally hang out over on SO but wanted to ask this question in a more appropriate forum. I have, for the sheer fun of learning how to do (as I'm sick of GHOST and dd images) set up WDS and captured a reference WIM file. One of the things that I remember being promised was the ability to do offline servicing of WIM files. I'm just wondering what the actual procedure is for this? I have the full SP1 ISO down (covers 7 and 2008R2) and was wondering about next steps. If someone could point me in the right direction I'd appreciate it greatly. Thanks - Derek

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• Where is the statusbar in Firefox 4? How do I get it back?

  - by lovinglinux

  Since version 4.0b7pre, there is no more statusbar in Firefox, which has been replaced by the new add-ons bar. The main problem is that a lot of users like me are missing some valuable information that was displayed in the statusbar on previous versions. For instance, when hovering a link the url is now displayed in the address bar and you can't see the entire address. Other information like which servers are being contacted when you load a page are no longer displayed.

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• Can a virus attack my BIOS to disable the DVD drive?

  - by user636547

  A friend's laptop DVD drive is suddenly no longer detected. It's going to be difficult to walk him through going into the BIOS (he's not local). I wonder if it is even worthwhile i.e. whether the BIOS settings can be corrupted by a virus. Are BIOS settings formatted in a standard way such that a virus writer would know what to alter? FYI, he did reinstall the OS and the drive is still not detected.

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• KDE on Windows won't download/install

  - by endolith

  No matter which mirror I use, I get this error. I've tried a few times over the last several weeks. Download failed --------------------------- The download of ftp://kde.mirrors.tds.net/pub/kde/stable/4.5.4/win32/libopensp-vc100-1.5.2-bin.tar.bz2 failed with error: archive downloaded from ftp://kde.mirrors.tds.net/pub/kde/stable/4.5.4/win32/libopensp-vc100-1.5.2-bin.tar.bz2 checksum error --------------------------- Retry Ignore Cancel Should I just ignore this and let it continue? Update: I ran as administrator, changed the install directory to C:\KDE, and ignored this error, and it seemed to install, but then gave me a different error, same file: Error --------------------------- Internal Error - File C:/Temp/KDE/libopensp-vc100-1.5.2-bin.tar.bz2 does not exist --------------------------- Cancel But now programs seem to work! Should I just ignore this error? I can't even find a plain English explanation of what libopensp is.

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• Why Does My Laptop Freeze Up When Docked?

  - by Michael Haren

  I have a Dell Latitude D520. First with Windows XP and now with Windows 7, it completely freezes/locks up if I dock it while it's awake. If I hibernate/sleep, dock, then wake/resume, everything's fine. I installed the Dell Notebook System Software for Vista (No Win7 version available) and updated the bios to the latest version but the problem persists. As long as I remember to put this thing in standby before I dock it, it's extremely reliable--it survives my daily commute and heavy use and typically only reboots a few times a month. Any other ideas for things I can try?

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• What Linux distro should I install on an old PowerPC Mac?

  - by rockit

  I'm trying to set up my brother–who has a PPC Mac with 1 GHz processor and 256 MB RAM–with a Linux distro that would allow him to surf the web on the device. If anyone knows of this Mac, they also know that support has faded for the latest browsers, rendering the device essentially useless when it comes to the web. Ideally I would have installed Jolicloud, but alas, it is only Intel Mac compatible... Please let me know if you have any suggestions for me!

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• Limit user to one CPU core in windows 7

  - by Dean Ward

  I let my family members use my pc over rdp to play their flash-based games as their laptops overheat if they use them directly. I have it setup so I can use the pc at the same time as them. The pc has a quad core cpu and I would like to be able to assign one of those cores to the user logged in via RDP so that the other 3 cores are left alone. Is this possible? They login via a specific user account setup for the purpose. Thanks for any advice!

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• Customizing tmux status to represent current working directory and files

  - by user69397

  I've been playing with this for a couple of days, so I'm sure I'm missing something simple. Love tmux. Using it for development and have so many windows I need a better way of distinguishing them in the status bar and in the buffer list. Seeing a list of "bash" and "vim" isn't really helpful at all. And since they're all on the same host - don't care about the hostname right now. I'd like to show the current working directory, and the file being worked on. For example when I view the list of buffers I currently see: (0) 0: vim [100x44] (1 panes) "murph" (1) 1: vim [100x44] (1 panes) "murph" (2) 2: bash- [100x44] (1 panes) "murph" (3) 3: bash* [100x44] (1 panes) "murph" Here's what I'd like to see 0:vim main.py ~/devl/project1 1:vim index.html ~/devl/samples/staticfiles 2:bash ~/devl/sandbox 3:bash ~/.vimrc I'd like to see similar info in the status bar for each individual window. While I am able to get PWD to show up in the status bar of a window, it's only the working directory from where tmux was launched. This isn't any help as I change directories. I'm hoping this can be done without a bunch of scripts. Thanks all.

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• Free Markdown JS viewer

  - by maaartinus

  I'd like to use Markdown for documents to be exchanged with a colleague of mine. The ideal workflow would be IMHO editing the source in any plaintext editor while simultaneously viewing it in a browser. The client viewer should be able to redraw the text after each save automatically, and ideally even always switch to the most recent source file (so I don't need to navigate there manually). It'd be nice if I could (was allowed) modify the viewer a bit, things like using trailing spaces for line breaks are really terrible (I don't see them, my editor strips them, git complains about them, etc.). I'm interested in a software capable of this and easy to modify, and also in your opinions on the described workflow.

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• KB980408: Fix for Explorer freezing: does anyone know what app caused it?

  - by Ian Boyd

  Microsoft released an update for Windows 7 today (Tuesday, April 27, 2010): KB980408: The April 2010 stability and reliability update for Windows 7 and Windows Server 2008 R2 is available. The update fixes, among other things: Windows Explorer may stop responding for 30 seconds when a file or a directory is created or renamed after certain applications are installed. i'm not experiencing it on my own Windows 7 machine, but two colleagues at work were experiencing the problem. i would really like to know what applications were causing problems. Microsoft will never call out the misbehaving applications. i want to know what software i should be ridiculing and insulting. And avoid in the future. Did anyone who was experiencing this problem isolate the applications?

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• Run Windows batch file on schedule as non-Administrator user

  - by Evgeny

  I'm running Windows XP x64 SP2. I have a Windows batch file that with some Robocopy commands that I want to run on schedule. I created a scheduled task for it, running as a dedicated user (not the user I'm logged on as), but it simply did not run. I could see successful logon events in the security log, so it got that far, but the commands in the batch file definitely weren't getting executed. After reading through all of http://social.technet.microsoft.com/Forums/en-US/winservermanager/thread/d47d116e-10b9-44f0-9a30-7406c86c2fbe/ I tried making the target user account an Administrator and that fixed it - the batch file ran just fine. Nothing else seemed to work. The thing is, I want it to run under a low-privileged account. Does anyone know how can I get a batch file to run on schedule as a non-Administrator?

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• Are there any security concerns when using Windows' default workgroup?

  - by koiyu

  Are there any security concerns one should be aware of if you're using Windows' default workgroup as the workgroup? (Or is worrying just tinfoiling?) Should it be commonplace to rename the workgroup to something personal/unique after Windows installation? Are there any other benefits in renaming the workgroup from the default besides making it to look more describing? Ie. is renaming worth the hassle as it makes the workgroup generally less accessible? It is used in local area network after all.

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• Problem in listening to multicast in multihomed Linux server

  - by Lior

  I am trying to write a multicast client on a machine with two NICs, and I can't make it work. I can see with a sniffer that once I start the program the NIC (eth4) start receiving the multicast datagrams: y.y.y.y. (some ip) - z.z.z.z (multicast ip, not my eth4 NIC IP) UDP Source port: kkk (some other port) Destination port: xxx (multicast port) However, I can't get those packets using my program (listening to port xxx on eth4). I also added: route add 224.0.0.0 netmask 240.0.0.0 dev eth4 Searched the web for some examples/explanations, but it seems like I do what everybody else does. Any help will be appreciated. is there anything else to do with route/iptables?

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• Will my internet address for my internal site cause my traffic to go external?

  - by Toby Allen

  If I have two domains pointing to the same machine, but one resolves to an internal address and the other to my internet facing router, will there be any differnce in route taken to my machine (primarily in terms of performanc). eg. internal.mydomain.com resolves to 192.168.1.200 external.mydomain.com resolves to A.Web.External.IP both eventually resolve back to the same machine. For a client in the network, will using the external address give a performance penalty?

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• How to securely delete files stored on a SSD?

  - by Chris Neuroth

  From a (very long, but definitely worth to read) article on SSDs: When you delete a file in your OS, there is no reaction from either a hard drive or SSD. It isn’t until you overwrite the sector (on a hard drive) or page (on a SSD) that you actually lose the data. File recovery programs use this property to their advantage and that’s how they help you recover deleted files. The key distinction between HDDs and SSDs however is what happens when you overwrite a file. While a HDD can simply write the new data to the same sector, a SSD will allocate a new (or previously used) page for the overwritten data. The page that contains the now invalid data will simply be marked as invalid and at some point it’ll get erased. So, what would be the best way to securely erase files stored on a SSD? Overwriting with random data as we are used to from hard disks (e.g. using the "shred" utility) won't work unless you overwrite the WHOLE drive...

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• Week in Geek: Google Asks for Kids’ Social Security Numbers Edition

  - by Asian Angel

  This week we learned how to make hundreds of complex photo edits in seconds with Photoshop actions, use an Android Phone as a modem with no rooting required, install a wireless card in Linux using Windows drivers, change Ubuntu’s window borders with Emerald, how noise reducing headphones work, and more. Photo by Julian Fong. Latest Features How-To Geek ETC 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 How to Use Google Chrome as Your Default PDF Reader (the Easy Way) Preliminary List of Keyboard Shortcuts for Unity Now Available Bring a Touch of the Wild West to Your Desktop with the Rango Theme for Windows 7 Manage Your Favorite Social Accounts in Chrome and Iron with Seesmic E.T. II – Extinction [Fake Movie Sequel Video] Remastered King’s Quest Games Offer Classic Gaming on Modern Machines Compare Your Internet Cost and Speed to Global Averages [Infographic]

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• What is a Relational Database Management System (RDBMS)?

  A Relational Database Management System (RDBMS)  can also be called a traditional database that uses a Structured Query Language (SQL) to provide access to stored data while insuring the integrity of the data. The data is stored in a collection of tables that is defined by relationships between data items. In addition, data permitted to be joined in new relationships. Traditional databases primarily process data through transactions called transaction processing. Transaction processing is the methodology of grouping related business operations based predefined business events. An example of this can be seen when a person attempts to purchase an item from an online e-tailor. The business must execute specific operations for a related  business event. In this case, a business must store the following information: Customer Info, Order Info, Order Item Info, Customer Payment Data, Payment Results, and Current Order Status. Example: Pseudo SQL Operations needed for processing an online e-tailor sale. Insert Customer into Customers Insert New Order into Orders Insert Each New Order Item into OrderItems Insert Customer Payment Info into PaymentInfo Insert Payment Processing Result into PaymentDetails Update Customer for Current Order Status Common Relational Database Management System Microsoft SQL Server Microsoft Access Oracle MySQL DB2 It is important to note that no current RDBMS has fully implemented all of the Relational Principles. Common RDBMS Traits Volatile Data Supports Transaction Processing Optimized for Updates and Simple Queries 

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• What is Object Oriented Programming ill-suited for?

  - by LeguRi

  In Martin Fowler's book Refactoring, Fowler speaks of how when developers learn something new, they don't consider when it's inappropriate for the job: Ten years ago it was like that with objects. If someone asked me when not to use objects, it was hard to answer. [...] It was just that I didn't know what those limitations were, although I knew what the benefits were. Reading this, it occurred to me I don't know what the limitations or potential disadvantages of Object-Oriented Programming are. What are the limitations of Object Oriented Programming? When should one look at a project and think "OOP is not best suited for this"?

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• Why does the use of interface-based programming appear to be limited to behaviour?

  - by Carnotaurus

  I have been doing a little thinking about inheritance vs. realization vs. composition. I am not about to post the whole detail here. So I was wondering, when are not talking about supporting unit testing: Why does interface-based programming seem to focus upon the grouping of common behaviour, e.g., IPettable (for an animal), IEditable (for a user control), ISubmitable (for a form), etc. Why does the use of interface-based programming appear to be limited to behaviour when we could pragmatically group not so much on behaviour but on commonsense physical similarities which could have nothing to do with behaviour? It is not that there is some limiting feature within OOP; so how come?

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• Setting coding priorities

  - by dotnetdev

  Hi, In the dev shops I've worked in, nobody has ever mentioned "coding priorities". I read this in a book or site somewhere, and sets the expectation of what priority should be first in the code. In places where this is not specified, what should the first priority be? It may sound simple to say "do what the business need requires", but that could be at the expense of performance/maintainability. Many people say maintainability first, regardless, some say fulfill the need regardless. I am a young developer, so I am probably missing the point somewhere. Of course, programming is engineering and tough because you can never have the perfect solution. Thanks

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• Java GNOME bindings, are those a good idea?

  - by Phobia

  What do you think of Java's GNOME bindings and I was surprised to know that the latest version of the bindings was released this month and they're backed by a company that uses them, which means that there's a considerable amount of activity in the project, and that it's not going to be ditched anytime soon Is this going to be a second chance for Java on the desktop, since GTK+ is cross platform like swing, but less bloated and more responsive Should I be learning how to develop applications using it? or it's not worth the time?

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