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• Which version management design methodology to be used in a Dependent System nodes?

  - by actiononmail

  This is my first question so please indicate if my question is too vague and not understandable. My question is more related to High Level Design. We have a system (specifically an ATCA Chassis) configured in a Star Topology, having Master Node (MN) and other sub-ordinate nodes(SN). All nodes are connected via Ethernet and shall run on Linux OS with other proprietary applications. I have to build a recovery Framework Design so that any software entity, whether its Linux, Ramdisk or application can be rollback to previous good versions if something bad happens. Thus I think of maintaining a State Version Matrix over MN, where each State(1,2....n) represents Good Kernel, Ramdisk and application versions for each SN. It may happen that one SN version can dependent on other SN's version. Please see following diagram:- So I am in dilemma whether to use Package Management Methodology used by Debian Distributions (Like Ubuntu) or GIT repository methodology; in order to do a Rollback to previous good versions on either one SN or on all the dependent SNs. The method should also be easier for upgrading SNs along with MNs. Some of the features which I am trying to achieve:- 1) Upgrade of even single software entity is achievable without hindering others. 2) Dependency checks must be done before applying rollback or upgrade on each of the SN 3) User Prompt should be given in case dependency fails.If User still go for rollback, all the SNs should get notification to rollback there own releases (if required). 4) The binaries should be distributed on SNs accordingly so that recovery process is faster; rather fetching every time from MN. 5) Release Patches from developer for bug fixes, feature enhancement can be applied on running system. 6) Each version can be easily tracked and distinguishable. Thanks

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• Drawing Grid in 3D view - Mathematically calculate points and draw line between them (Not working)

  - by Deukalion

  I'm trying to draw a simple grid from a starting point and expand it to a size. Doing this mathematically and drawing the lines between each point, but since the "DrawPrimitives(LineList)" doesn't work the way it should work, And this method can't even draw lines between four points to create a simple Rectangle, so how does this method work exactly? Some sort of coordinate system: [ ][ ][ ][ ][ ][ ][ ] [ ][2.2][ ][0.2][ ][2.2][ ] [ ][2.1][1.1][ ][1.1][2.1][ ] [ ][2.0][ ][0.0][ ][2.0][ ] [ ][2.1][1.1][ ][1.1][2.1][ ] [ ][2.2][ ][0.2][ ][2.2][ ] [ ][ ][ ][ ][ ][ ][ ] I've checked with my method and it's working as it should. It calculates all the points to form a grid. This way I should be able to create Points where to draw line right? This way, if I supply the method with Size = 2 it starts at 0,0 and works it through all the corners (2,2) on each side. So, I have the positions of each point. How do I draw lines between these? VerticeCount = must be number of Points in this case, right? So, tell me, if I can't supply this method with Point A, Point B, Point C, Point D to draw a four vertice rectangle (Point A - B - C - D) - how do I do it? How do I even begin to understand it? As far as I'm concered, that's a "Line list" or a list of points where to draw lines. Can anyone explain what I'm missing? I wish to do this mathematically so I can create a a custom grid that can be altered.

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• How to automount NTFS usb sticks on Xubuntu 12.10?

  - by netimen

  I'm running the Xubuntu 12.10 on a Lenovo T520 laptop. If I plug a FAT formatted usb stick, it's mounted automatically, but if I plug in a NTFS formatted one, I have to mount it manually. How to make NTFS usb sticks to mount automatically when plugged? My /etc/fstab in case it helps: # /etc/fstab: static file system information. # # Use 'blkid -o value -s UUID' to print the universally unique identifier # for a device; this may be used with UUID= as a more robust way to name # devices that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 /dev/sda1 / ext4 errors=remount-ro,user_xattr 0 1 # swap was on /dev/sda5 during installation UUID=cd221c3e-44a8-459e-9dfb-04787f1cd0b6 none swap sw

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• Need advice concerning Feature Based Development when knowledge DB is involved

  - by voroninp

  We develop BackOffice application which is used to edit our knowledge DB. Now our main product's development team is shifting to the feature based development and we need to support several DB's with not identical data schemes. (DS changes slightly from DB to DB) The information from knowledge Db is extracted by the script and then is distributed to the clients. We also need to support merging these DB's. We now analyze pros and cons of different approaches. We discuss this one: One working DB (WDB) with one DB for each feature branch (FDB). The approved data is moved from WDB to FDB. So we need to support only one script for each branch. This script will extract data from corresponding FDB. Nevertheless we are to code the differences between FDBs and WDB manually. May be some automatic mapping tools exist? I also wish to know whether classic solutions to the alike problems already exist. Can anyone share the best practices for this case?

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• How to create a local IIS site with encrypted wwwroot using EFS on Vista

  - by user20878

  I'm preparing a laptop to take with me while travelling, so all my user data is encrypted using EFS in case someone decides to steal it. I also need to set up a couple of local sites for development with IIS. If I turn off encryption on the wwwroot of a site, IIS can serve it just fine. However, I really would like to be able to use encryption here as well. I've tried these steps: http://support.microsoft.com/kb/243756 When I try to view the local site in IE, I get a login dialog as expected, but it doesn't accept my credentials, although this is the account I use to encrypt the served files. Has anyone tried this and got it to work?

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• Can I take a HDD in Raid1 and plug it straight into a different machine?

  - by jacko

  I would assume that I can just take my HDD out of my NAS (in raid1 mirror) and plug it into another enclosure and have it work off the bat but I'd like to make sure... Any ideas? Edit: My current setup is a Netgear ReadyNAS in (hardware) raid1. I'm hoping to replace this with a home theatre type PC (possibly running Ubuntu), and would like to migrate my data without having to do a bulk transfer over my network between the 2 machines. Can anyone confirm the case for the Netgear ReadyNAS?

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• Dropbox context menu missing in OS X

  - by slhck

  Problem My Dropbox context menu is missing in OS X Snow Leopard (10.6.8). While the Dropbox service runs normally, Finder doesn't show the icons and also doesn't give me the ability to browse files on the website or copy the public link. What I've tried Removed ~/.dropbox and ~/Dropbox/.dropbox.cache Reinstalled Dropbox.app (both 1.4.7 stable and 1.5.0 experimental), went through the setup again Restarted Finder Logged out and back in All of these I've done over and over again, in random permutations. I've made sure that Dropbox appears in the Login Items under my Account (and I've never touched that) I don't know if ~/Library/Contextual Menu Items is missing the Dropbox plugin or if there shouldn't be one after all. In any case, I can't get the icons or the menu to appear.

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• My Obligatory IPad Post

  - by mark.wilcox

  I've had my IPad for about a week now. So I thought I'd write some thoughts down based on my initial experiences. Here are my initial take-aways: 1 - Netflix OnDemand - I'm a movie junkie. I'm now more apt to just start a movie as background sound for my workday (I telecommute - so except for the occasional bark from my dog, it's awfully quiet here if I don't have something going). 2 - The Email Client is really nice and I'm as fast or faster typing when I have the wireless keyboard engaged. Even with onscreen keyboard - I'm already close to 75% of desktop speed 3 - The battery life is incredible - I think this is the first case where a mobile device actually under-promised on battery 4 - It totally has killed the notion of using a normal PC for my wife and mother-in-law - neither of which had wanted an iPhone/iPod Touch or really any Apple device until they got to play with my iPad. The concept of - instant on, easy to hold and touch-based navigation has them hooked. Heck, it has me hooked. My ultimate goal is to be able to have it at least replace the need to take my netbook with me on the road. I haven't had a chance to complete my testing on that front yet - between work, my wife traveling (for a change) and now my wife home sick - I haven't had time to just play with it. But so far my only regret - that I haven't already bought two more for everyone else in my family who wants to use mine. Posted via email from Virtual Identity Dialogue

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• How do I disable automatic updates on OpenSUSE 12.2

  - by MathematicalOrchid

  For reasons unknown, OpenSUSE seems to have half a dozen different places that mention auto-update. Is there a way I can definitely, permanently, irreversibly disable auto-update so that new software will never, ever, under any circumstances, be installed? Ideally I want to prevent the OS from even connecting to the Internet to see if any updates are available. I've unchecked half a dozen things, but I'm still getting alerts telling me updates are available. I do now want updates! I can't believe this is so hard to turn off... In case it makes any difference, OpenSUSE 12.2 with a GNOME desktop.

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• Has anyone had luck getting an external hard drive working with a PCMCIA USB card?

  - by Carl

  I would like to know if anyone has had any success in getting and external 2.5" IDE hard drive in an external case (w/USB cable) working when plugged into a PCMCIA USB card. My hard drive doesn't work when plugged into my HT-Link Cardbus/PCMCIA USB 2.0 2-port card (NEC / 32-bit). My MP3 player will work fine when plugged into it. I tried plugging in both of the USB cables that are one one end (Y cable), and it doesn't make a difference. I read the problem may be insufficient power.

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• What is the standard technique for shifting the frames of a sprite according to user input?

  - by virtual__

  From my own experience, I developed two techniques for changing the sprites of a character that's reacting to user input -- this in the context of a classic 2D platformer. The first one is to store all character's pixmaps in a list, putting the index of the currently used pixmap in an ordinary variable. This way, every time the player presses a key -- say the right arrow for moving the character forward -- the graphics engine sees what's the next pixmap to draw, draws it, and increments the index counter. That's a pretty common approach I believe, the problem is that in this case the animation's quality depends not only on the number of sprites available but also on how often your engine listens to user input. The second technique is to actually play an animation every key press event. For this you can use any sort of animation framework you want. It's only necessary to set the timer, the animation steps and to call the animation's play() method on your key press event handler. The problem with that approach is that is lacks responsiveness, since the character won't react to any input while the current animation is still being played. What I want to know is whether you are using one of these techniques -- or something similar -- in your games, or whether there's a standard method for animating sprites out there that's widely known by everybody but me.

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• Item missing/damaged from Amazon order? Steps to quickly contact support to get replacements

  - by Gopinath

  I ordered few items from Amazon.com last week and when the package is delivered I found an item is missing. I reached out to Amazon Customer care and they resolved the issue by resending the missing item. Amazon’s customer care is awesome! They just asked me few questions regarding the order, person who accepted the delivery and without any further delay they provided details on when I’ll get the replacement item. Best part is Amazon customer care support is available through email, chat & telephone. I chose support through a chat session and resolved the issue. If you also missed an item or found a damaged item then here are the steps to be followed to get a replacement item Step 1 -  Go to amazon.com/contact Step 2 -  Click on Contact Us button available in General Support section, you may have to provide authentication details Step 3 – Contact Us screen displays your recent order. If your query is related to the displayed order then proceed go to next step otherwise select your order by clicking on Choose Different Order button Step 4 – Select the missing/damaged items from the list of items displayed from your order Step 5 – Choose the issue with your order. In case if an item is missing you may want to choose “Problem with an order”, “Missing item or parts” and “Entire item missing from shipment”. You may want to choose the options that are close to the issue you are facing with your order Step 6 – Choose how you want to support. You can choose either “E-Mail”, “Phone” or “Chat”. Based on the selected Support mode, proceed and communicate to them about the issue.  Rest assured. They will resolve your issue quickly.

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• "Misaligned partition" - Should I do repartition (how?)

  - by RndmUbuntuAmateur

  Tried to install Ubuntu 12.04 from USB-stick alongside the existing Win7 OS 64bit, and now I'm not sure if install was completely successful: Disk Utility tool claims that the Extended partition (which contains Ubuntu partition and Swap) is "misaligned" and recommends repartition. What should I do, and if should I do this repartition, how to do it (especially if I would like not to lose the data on Win7 partition)? Background info: A considerably new Thinkpad laptop (UEFI BIOS, if that matters). Before install there were already a "SYSTEM_DRV" partition, the main Windows partition and a Lenovo recovery partition (all NTFS). Now the table looks like this: SYSTEM_DRV (sda1), Windows (sda2), Extended (sda4) (which contains Linux (sda5; ext4) and Swap (sda6)) and Recovery (sda3). Disk Utility Tool gives a message as follows when I select Ext: "The partition is misaligned by 1024 bytes. This may result in very poor performance. Repartitioning is suggested." There were couple of problems during the install, which I describe below, in the case they happen to be relevant. Installer claimed that it recognized existing OS'es fine, so I checked the corresponding option during the install. Next, when it asked me how to allocate the disk space, the first weird thing happened: the installer give me a graphical "slide" allocate disk space for pre-existing Win7 OS and new Ubuntu... but it did not inform me which partition would be for Ubuntu and which for Windows. ..well, I decided to go with the setting installer proposed. (not sure if this is relevant, but I guess I'd better mention it anyway - the previous partition tools have been more self-explanatory...) After the install (which reported no errors), GRUB/Ubuntu refused to boot. Luckily this problem was quite straightforwardly resolved with live-Ubuntu-USB and Boot-Repair ("Recommended repair" worked just fine). After all this hassle I decided to check the partition table "just to be sure"- and the disk utility gives the warning message I described.

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• How do I configure namecheap for "arbitrarily-nested" wildcard subdomains?

  - by rabidsnail

  I'm trying to set up something like nyud.net, where any arbitrary chain of subdomains resolves to the same CNAME record (which in my case points to an amazon elastic load balancer). Ex: www.gogle.com.nyud.net:8080 points to one of their cache servers, which looks at the HOST header and returns www.google.com. I'm using namecheap as my dns host. Adding a CNAME record for *.mydomain.com doesn't seem to do anything (nslookup gives NXDOMAIN for all subdomains). What do I have to do to set this up? Do I have to use something fancier than namecheap (like route53)?

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• Solving the puzzle in javascript [on hold]

  - by Gandalf StormCrow

  I've recently try to brush up my javascript skills, so I have a friend who gives me puzzles from time to time to solve. Yesterday I got this : function testFun() { f = {}; for( var i=0 ; i<3 : i++ ) { f[i] = function() { alert("sum='+i+f.length); } } return f; } Expected Results: testFun()[0]() should alert “sum=0” testFun()[1]() should alert “sum=2” testFun()[2]() should alert “sum=4” I did this which does like requested above: function testFun() { var i, f = {}; for (i = 0; i < 3; i++) { f[i] = (function(number) { return function() { alert("sum=" + (number * 2)); } }(i)); } return f; } Today I got new puzzle : Name everything wrong with this javascript code, then tell how you would re-write it. function testFun(fInput) { f = fInput || {}; // append three functions for( var i=0 ; i<3 : i++ ) { f[i] = function() { alert("sum='+i+f.length); } } return f; } // Sample Expected Results (do not change) myvar = testFun(); myvar[0](); // should alert “sum=0” myvar[1](); // should alert “sum=2” testFun(['a'])[2](); // should alert “sum=5”`enter code here How do I accomplish the third case testFun(['a'])[2]()? Also could my answer from yesterday be written better and what can be improved if so?

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• How to optimize a box2d simulation in action game?

  - by nathan

  I'm working on an action game and i use box2d for physics. The game use a tiled map. I have different types of body: Static ones used for tiles Dynamic ones for player and enemies Actually i tested my game with ~150 bodies and i have a 60fps constantly on my computer but not on my mobile (android). The FPS drop as the number of body increase. After having profiled the android application, i saw that the World.step took around 8ms in CPU time to execute. Here are few things to note: Not all the world is visible on screen, i use a scrolling system Enemies are constantly moving toward the player so there is alaways to force applied to their body Enemies need to collide between each others Enemies collide with tiles I also now that i can active/desactive or sleep/awake bodies. Considering the fact that only a part of the enemies are possibly displayed on screen, is there any optimizations i can do to reduce the execution time of box2d simulation? I found a guy trying an optimization based on distance of enemies from the player (link). But i seems like he just desactives far bodies (in my case, i could desactive bodies that are not visible). But my enemies need to move even when they are not visible on screen, and applying forces will not workd on inactive bodies. Should i play with sleeping bodies here? Also, enemies are composed by two fixtures and are constantly colliding with each others and with tiles but i really never need to get notified about that. Is there anything i can do to optimize this kind of scenario? Finally, am i wrong to try to run simulation at 60FPS on mobile and should i try to make it run at 30FPS?

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• Ping myself, works with ipv6 not ipv4 in Windows 7

  - by user68546

  Hi! I've tried to solve the following problem with no luck and I need some proffesional help. The following is possible: Ping all computers (that I tried) in the domain without problem. Ping myself with localhost which use ::1. Ping myself with my given ipv6 IP. Internet access. The following is not possible: Noone can ping me (request timeout) with computername/ipv4/ipv6. I cannot ping myself with my given ipv4 IP or 127.0.0.1 (request timeout). Tried to enable/disable TCP/IPv4. Same issue. Turned off windows firewall. Added an inbound rule to allow icmp (just in case). Same same.. Is there someone out there that has any idea what the issue could be? Any help would be most appreciated!

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• As a programmer, what's the most valuable non-English (human) language to learn?

  - by Andrew M

  I was thinking that with my developer skills, learning new languages like French, German etc. might be easier for me now. I could setup the verbs as objects in Python and use dir(verb) to find its methods, tenses and stuff ;-) But seriously, if you're a professional developer, in my case in the UK, what's the best foreign language to learn from an employment perspective? I'm thinking, like Hindi - if all our programming jobs are getting outsourced to India, might as well position yourself to be the on-site, go-between guy. Mandarin - if the Chinese become the pre-eminent economy, the new USA, in ten or twenty years, then speaking their language would open up a huge market to you. Russian - maybe another major up-and-comer, but already closer to Western standards. More IT-sector growth here than anywhere else in the coming years? Japanese - drivers of global technology, being able to speak their language could give you a big competitive advantage over other Westerners But I'm just guessing/musing with all these points. If you have an opinion, or even better, some evidence, I'd like to hear it. If the programming things falls through then at least it'll make for more interesting holidays.

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• DVD RW: Are they still relevant for backups?

  - by Harry

  Hello, With the availability of compact USB memory sticks with much, MUCH higher storage capacities is there still any use-case for taking periodic, incremental backups on DVD/RWs? The DVD/RW has an additional annoyance that you cannot drag and drop files to it as easily as you can on a USB memory stick. So, if I have a 4.7GB DVD/RW, I must re-burn the whole image every time I backup new stuff... with possibly rearranged file/folder structure. Secondly, why in this day and age you cannot install a file-system (like ext3 or FAT32) on a DVD/RW... and likewise on CD/RW's as you can on a USB memory stick? Many thanks, /HS

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• Running SQL 2008 on a VM

  - by chris.w.mclean

  We are pondering trying to set up a SQL 2008 instance inside a VM for a production environment. All our SQL instances use iSCSI over gigabit ethernet to talk to a NAS, as would this new instance. Any reason this is a bad idea or any considerations to make this work well? The VM would be running in Xen 5.5 or we could set it up in Hyper-V if there's a compelling case for that. And the VM's VHD would be stored on a different NAS then the SQL storage is on.

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• Best way to troubleshoot apache not starting?

  - by lowgain

  We have recently gotten a backup server to mirror all our data onto in case the primary server goes down. I've gotten all the sites data updated through rsync, and all the apache config and databases updated. Both machines are on Ubuntu 9 (9.04 on the primary, 9.10 on the backup). So everything seems synced up for the most part at this point (still need to figure out user syncing), and I try to start Apache. I get * Starting web server apache2 [fail] Nothing else indicating what the problem could be. I know I don't have enough info to expect a solution from you guys, so I'd just like to know where I can go from here to further investigate this issue. Would there be any error logs for this? Thanks!

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• what to do when ctrl-c can't kill a process?

  - by Dustin Boswell

  Ctrl-c doesn't always work to kill the current process (for instance, if that process is busy in certain network operations). In that case, you just see "^C" by your cursor, and can't do much else. What's the easiest way to force that process to die now without losing my terminal? Summary of answers below: Usually, you can Ctrl-z to put the process to sleep, and then do "kill -9 process-pid", where you find the process's pid with 'ps' and other tools. On Bash (and possibly other shells) you can do "kill -9 %1" (or '%N' in general) which is easier. If Ctrl-z doesn't work, you'll have to open another terminal and kill from there.

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• Oracle Partner Days and Oracle Days are coming to an EMEA city near you!

  - by Javier Puerta

  Oracle Partner Days A new round of Oracle Partner Days is coming to a large number of European cities. These events are exclusive for Oracle partners and will deliver to you real Business return on your OPN membership.You will hear the business opportunities coming from the adoption of the entire Oracle stack, the latest products value propositions and related sales strategy and be able to connect directly with Oracle executives and find new business opportunities with other partners in your region.The EMEA Oracle Partner Days are Local/Regional live events targeting the key contacts in sales and consultancy delivering Oracle strategy, engaging around the several perspectives of the Oracle portfolio, executive keynotes and deep dive Business content-related breakout sessions. The first city will be Frankfurt, on Oct. 29. Check the full list to find an Oracle Partner Day in a city near you. Oracle Days Oracle Days will be hosted after Oracle OpenWorld across EMEA, along October and November. By attending an Oracle Day, customers and partners can: Learn about how to leverage the power of the Oracle stack, by hearing customer case studies about successful business transformation, and by following cross-stack solution tracks within the agenda Discuss key issues for business and IT executives in cloud, big data, social, and mobile solutions, and network with peers who are facing the same challenges Meet Oracle experts and watch live demos of new products Get the latest news from Oracle OpenWorld. See full calendar and cities here

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• DOS application to allow remote management of files over serial link

  - by tomlogic

  Harken back to the days of DOS. I have an embedded DOS handheld device, and I'm looking for a tool to manage the files stored on it. I picture an application I can launch on the device that opens COM1 up for commands to get a directory listing, send/receive files via x/y/zmodem, move/delete files, and create/move/delete directories. A Windows application can then download a recursive file listing and then manage those files (for example, synchronizing with a local directory). Keep in mind that this is DOS -- 8.3 filenames, 640K of RAM and a 19200bps serial link (yuk!). I'd prefer something with source in case we need to add additional features (for example, the ability to get a checksum of a file for change detection). Now that I've written this description, I realize I'm asking for something like LapLink or pcAnywhere. Norton no longer sells DOS versions of pcAnywhere and LapLink V for DOS seems pricy at $50. Are you aware of any similar apps from those good old days?

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• Rejecting new HTTP requests when server reaches a certain throughput

  - by Sam

  I have a requirement to run an HTTP server that rejects new HTTP requests (with a 503, or similar) when the global transfer rate of current HTTP responses exceeds a certain level. For example, if the web server is transferring at 98Mbps, and a new HTTP request arrives, we would want to reject this (as we couldn't guarantee a good speed). I've had a look at mod_cband for Apache, limit_req for nginx, and lighttpd's rate limiting features, but none of them seem to handle my (rather contrived, granted) use case. I should add that I'm open to using pretty much any web server, and am open to implementing this in iptables rules if someone can craft such a rule! (Refusing the TCP connection is fine, it doesn't have to respond with an HTTP 503). Any suggestions?

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