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  • Using LDAP as auth method for git repositories

    - by Lenni
    I want to convince my boss that we should be using git for version control. He says, that it absolutely must authenticate users through our central LDAP server. I looked at the various solutions (gitweb, gitorious ... ) and couln't really find a definitive answer about whether they support LDAP authentication. The only solution I could find a little info on was a Apache+mod_ldap setting. But that would mean that the user authenticating on LDAP wouldn't necessarily be the same as the actual git user, right? (Not that this is a huge problem, but just something which would bug me.) So, what's the best way to authenticate git users via LDAP?

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  • Cropping a line (laser beam) in XNA

    - by electroflame
    I have a laser sprite that I wish to crop. I want to crop it so when it collides with an item, I can calculate the distance between the starting point, and the ending point, and only draw that. This eliminates the "overdraw" of a laser drawing past an item. Essentially, I'm trying to crop a line, but also keep that line "attached" to the nose of my ship. The line should not be drawn past the nose of my ship, that should be the starting point. There is no rotation to worry about. Currently, I thought that doing this through SpriteBatch would be best. This is my current Spritebatch code: spriteBatch.Draw(Laser.sprite, new Rectangle((int)Laser.position.X, (int)Laser.position.Y, Laser.sprite.Width, LaserHeight), new Rectangle(0, 0, (int)(Laser.sprite.Width), LaserHeight), new Color(255, 255, 255, (byte)MathHelper.Clamp(Laser.Alpha, 0, 255)), Laser.rotation, new Vector2(Laser.sprite.Width/2, LaserHeight/2), SpriteEffects.None, 0); But this doesn't quite work. It does only draw part of the sprite, but when LaserHeight is incremented, it lengthens the line in both ways! I believe this is due to some stupid error on my part with the Origin of the draw. Quick recap: I need to have my laser sprite drawn with the bottom of it at the nose of my ship, and then use LaserHeight to crop the image so only part of it is drawn. I have a feeling my explanation is a bit...lacking. So if you require more information, please say so and I will try to provide more information. Thanks in advance!

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  • DataContractSerializer: type is not serializable because it is not public?

    - by Michael B. McLaughlin
    I recently ran into an odd and annoying error when working with the DataContractSerializer class for a WP7 project. I thought I’d share it to save others who might encounter it the same annoyance I had. So I had an instance of  ObservableCollection<T> that I was trying to serialize (with T being a class I wrote for the project) and whenever it would hit the code to save it, it would give me: The data contract type 'ProjectName.MyMagicItemsClass' is not serializable because it is not public. Making the type public will fix this error. Alternatively, you can make it internal, and use the InternalsVisibleToAttribute attribute on your assembly in order to enable serialization of internal members - see documentation for more details. Be aware that doing so has certain security implications. This, of course, was malarkey. I was trying to write an instance of MyAwesomeClass that looked like this: [DataContract] public class MyAwesomeClass { [DataMember] public ObservableCollection<MyMagicItemsClass> GreatItems { get; set; }   [DataMember] public ObservableCollection<MyMagicItemsClass> SuperbItems { get; set; }     public MyAwesomeClass { GreatItems = new ObservableCollection<MyMagicItemsClass>(); SuperbItems = new ObservableCollection<MyMagicItemsClass>(); } }   That’s all well and fine. And MyMagicItemsClass was also public with a parameterless public constructor. It too had DataContractAttribute applied to it and it had DataMemberAttribute applied to all the properties and fields I wanted to serialize. Everything should be cool, but it’s not because I keep getting that “not public” exception. I could tell you about all the things I tried (generating a List<T> on the fly to make sure it wasn’t ObservableCollection<T>, trying to serialize the the Collections directly, moving it all to a separate library project, etc.), but I want to keep this short. In the end, I remembered my the “Debug->Exceptions…” VS menu option that brings up the list of exception-related circumstances under which the Visual Studio debugger will break. I checked the “Thrown” checkbox for “Common Language Runtime Exceptions”, started the project under the debugger, and voilà: the true problem revealed itself. Some of my properties had fairly elaborate setters whose logic I wanted to ignore. So for some of them, I applied an IgnoreDataMember attribute to them and applied the DataMember attribute to the underlying fields instead. All of which, in line with good programming practices, were private. Well, it just so happens that WP7 apps run in a “partial trust” environment and outside of “full trust”-land, DataContractSerializer refuses to serialize or deserialize non-public members. Of course that exception was swallowed up internally by .NET so all I ever saw was that bizarre message about things that I knew for certain were public being “not public”. I changed all the private fields I was serializing to public and everything worked just fine. In hindsight it all makes perfect sense. The serializer uses reflection to build up its graph of the object in order to write it out. In partial trust, you don’t want people using reflection to get at non-public members of an object since there are potential security problems with allowing that (you could break out of the sandbox pretty quickly by reflecting and calling the appropriate methods and cause some havoc by reflecting and setting the appropriate fields in certain circumstances. The fact that you cannot reflect your own assembly seems a bit heavy-handed, but then again I’m not a compiler writer or a framework designer and I have no idea what sorts of difficulties would go into allowing that from a compilation standpoint or what sorts of security problems allowing that could present (if any). So, lesson learned. If you get an incomprehensible exception message, turn on break on all thrown exceptions and try running it again (it might take a couple of tries, depending) and see what pops out. Chances are you’ll find the buried exception that actually explains what was going on. And if you’re getting a weird exception when trying to use DataContractSerializer complaining about public types not being public, chances are you’re trying to serialize a private or protected field/property.

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  • Multitenant Design for SQL Azure: White Paper Available

    - by Herve Roggero
    Cloud computing is about scaling out all your application tiers, from web application to the database layer. In fact, the whole promise of Azure is to pay for just what you need. You need more IIS servers? No problemo... just spin another web server. You expect to double your storage needs for Azure Tables? No problemo; you are covered there too... just pay for your storage needs. But what about the database tier, SQL Azure? How do you add new databases easily, and transparently, so that your application simply uses more of SQL Azure if its needs to? Without changing a single line of code? And what if you need to scale back down? Welcome to the world of database scalability. There are many terms that describe database scalability, including data federation, multitenant designs, and even NoSQL depending on the technical solution you are implementing.  Because SQL Azure is a transactional database system, NoSQL is not really an option. However data federation and multitenant designs offer some very interesting scalability options that are worth considering. Data federation, a feature of SQL Azure that will be offered in the future, offers very interesting capabilities available natively on the SQL Azure platform. More to come in a few weeks... Multitenant designs on the other hand are design practices and technologies designed to help you reach flexible scalability options not available otherwise. The first incarnation of such a method was made available on CodePlex as an open source project (http://enzosqlshard.codeplex.com).  This project was an attempt to provide a sharding library for educational purposes.  All that sounds really cool... and really esoteric... almost a form of database "voodoo"... However after being on multiple Azure projects I am starting to see a real need. Customers want to be able to free themselves from the database tier, so that if they have 10 new customers tomorrow, all they need to do is add 2 more SQL Azure instances. It's that simple. How you achieve this, and suggested application design guidelines, are available in a white paper I just published.  The white paper offers two primary sections. The first section describes the business and technical problem at hand, and how to classify it according to specific design patterns. For example, I discuss compressed shards through schema separation. The second section offers a method for addressing the needs of a multitenant design using a new library, the big bother of the codeplex project mentioned previously (that I created earlier this year), complete with management interface and such. A Beta of this platform will be made available within weeks; as soon as the documentation will be ready.   I would like to ask you to drop me a quick email at [email protected] if you are going to download the white paper. It's not required, but it would help me get in touch with you for feedback.  You can download this white paper here:   http://www.bluesyntax.net/files/EnzoFramework.pdf . Thank you, and I am looking for feedback, thoughts and implementation opportunities.

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  • TV Antenna Helper Makes HDTV Antenna Calibration a Snap

    - by ETC
    If you’re rocking an Android device, TV Antenna Helper is a free tool that will help you orient your HDTV antenna for best signal strength. The free (ad-supported) application checks your location and lists all the HDTV stations within range. You can check signal strength, use compass bearings to help align the antenna with the stations you want to tune, and check additional information about the station and your orientation to it. It’s the kind of tool you won’t need everyday but when trotted out will save you tons of time and aggravation. Hit up the link below for more information and to grab a free copy for your Android device. TV Antenna Helper [Android Market via Addictive Tips] Latest Features How-To Geek ETC Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET 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 Awesome 10 Meter Curved Touchscreen at the University of Groningen [Video] TV Antenna Helper Makes HDTV Antenna Calibration a Snap Turn a Green Laser into a Microscope Projector [Science] The Open Road Awaits [Wallpaper] N64oid Brings N64 Emulation to Android Devices Super-Charge GIMP’s Image Editing Capabilities with G’MIC [Cross-Platform]

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  • Do you want to be an ALM Consultant?

    - by Martin Hinshelwood
    Northwest Cadence is looking for our next great consultant! At Northwest Cadence, we have created a work environment that emphasizes excellence, integrity, and out-of-the-box thinking.  Our customers have high expectations (rightfully so) and we wouldn’t have it any other way!   Northwest Cadence has some of the most exciting customers I have ever worked with and even though I have only been here just over a month I have already: Provided training/consulting for 3 government departments Created and taught courseware for delivering Scrum to teams within a high profile multinational company Started presenting Microsoft's ALM Engagement Program  So if you are interested in helping companies build better software more efficiently, then.. Enquire at [email protected] Application Lifecycle Management (ALM) Consultant An ALM Consultant with a minimum of 8 years of relevant experience with Application Lifecycle Management, Visual Studio (including Visual Studio Team System) and software design is needed. Must provide thought leadership on best practices for enterprise architecture, understand the Microsoft technology solution stack, and have a thorough understanding of enterprise application integration. The ALM Practice Lead will play a central role in designing and implementing the overall ALM Practice strategy, including creating, updating, and delivering ALM courseware and consultancy engagements. This person will also provide project support, deliverables, and quality solutions on Visual Studio Team System that exceed client expectations. Engagements will vary and will involve providing expert training, consulting, mentoring, formulating technical strategies and policies and acting as a “trusted advisor” to customers and internal teams. Sound sense of business and technical strategy required. Strong interpersonal skills as well as solid strategic thinking are key. The ideal candidate will be capable of envisioning the solution based on the early client requirements, communicating the vision to both technical and business stakeholders, leading teams through implementation, as well as training, mentoring, and hands-on software development. The ideal candidate will demonstrate successful use of both agile and formal software development methods, enterprise application patterns, and effective leadership on prior projects. Job Requirements Minimum Education: Bachelor’s Degree (computer science, engineering, or math preferred). Locale / Travel: The Practice Lead position requires estimated 50% travel, most of which will be in the Continental US (a valid national Passport must be maintained).  This is a full time position and will be based in the Kirkland office. Preferred Education: Master’s Degree in Information Technology or Software Engineering; Premium Microsoft Certifications on .NET (MCSD) or MCPD or relevant experience; Microsoft Certified Trainer (MCT) or relevant experience. Minimum Experience and Skills: 7+ years experience with business information systems integration or custom business application design and development in a professional technology consulting, corporate MIS or software development environment. Essential Duties & Responsibilities: Provide training, consulting, and mentoring to organizations on topics that include Visual Studio Team System and ALM. Create content, including labs and demonstrations, to be delivered as training classes by Northwest Cadence employees. Lead development teams through the complete ALM and/or Visual Studio Team System solution. Be able to communicate in detail how a solution will integrate into the larger technical problem space for large, complex enterprises. Define technical solution requirements. Provide guidance to the customer and project team with respect to technical feasibility, complexity, and level of effort required to deliver a custom solution. Ensure that the solution is designed, developed and deployed in accordance with the agreed upon development work plan. Create and deliver weekly status reports of training and/or consulting progress. Engagement Responsibilities: · Provide a strong desire to provide thought leadership related to technology and to help grow the business. · Work effectively and professionally with employees at all levels of a customer’s organization. · Have strong verbal and written communication skills. · Have effective presentation, organizational and planning skills. · Have effective interpersonal skills and ability to work in a team environment. Enquire at [email protected]

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  • Planning home network

    - by gakhov
    I'm planning to setup my home network from scratch and want to ask professional opinions or tips. My home is connected to Internet with a cable connection (100 Mb/s). The devices I would like to connect are VoIP phone (RJ-45), TV (WiFi/LAN), 3 laptops (WiFi), 2 smartphones (WiFi), an iPad (WiFi), a Kindle (WiFi), a network printer and, probably, a home media storage (WiFi/LAN). As you can see, the most load will be on WiFi connections (probably, even if TV supports WiFi it's better to connect it by LAN?). So, I need help to choose the best router (or combination of routers) to support stable connections for all these devices and minimize the total number of routers/adapters. I like how Cisco/Linksys devices were working for me in the past, so preferably (but not obligatorily) I want to setup network with their solutions. Any thoughts?

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  • What is a generic term for name/identifier? (as opposed to label)

    - by d3vid
    I need to refer to a number of things that have both an identifier value (used in code and configuration), and a human-readable label. These things include: database columns dropdown items subapplications objects stored in a dictionary I want two unambiguous terms. One to refer to the identifier/value/key. One to refer to the label. As you can see, I'm pretty settled on the latter :) For the former, identifier seems best (not everything is strictly a key, and value and name could refer to the label; although, identifier usually refers only to a variable name), but I would prefer to follow an established practice if there is one. Is there an established term for this? (Please provide a source.) If not, are there any examples of a choice from a significant source (Java APIs, MSDN, a big FLOSS project)? (I wasn't sure if this should be posted here or to English Language & Usage. I thought this was the more appropriate expert audience. Happy to migrate if not.)

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  • Xcode find in document stuck in case-sensitive

    - by mjdth
    When in Xcode editing code for my objective C files, I often press Command-F to bring up the little Find-In-Document banner across the top. Sometimes this gets stuck in case-sensitive search, and when it does that it also won't loop through the entire document and sometimes won't even display the selected found string. I can't find any options to turn off the case sensitivity, and I never intentionally turned it on. I've restarted xcode several times hoping that would be it but it's changed nothing. Slightly off-topic, but this was the best place I could think of to ask this question. Thanks for any response!

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  • Sharing a printer over the net from Windows 7 to Windows Server 2003

    - by Grant Unwin
    Hi, I need to share a printer that is connected to a Windows 7 computer. The windows 7 computer is in another building about an hours drive away. The computer that needs to access the printer is running Windows Server 2008. Ive tried setting the printer as 'shared' for 'everyone' on the Windows 7 PC and accessing it from the server by adding a TCP/IP port to the IP address but the printer just wont add. From googling aparently it may need setting up as a printer server through IIS, but i'm just not sure on the best practice. Any help greatly appreciated. Thanks Grant Unwin

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  • From The OU Classrooms...

    - by rajeshr
    No excuses for not doing this systematically, and I'm trying my best to break this bad habit of bulk uploads of class photographs and do it regularly instead. But for the time being, please forgive my laziness and live by my mass introduction of all fun loving, yet talented folks whom I met in the OU classrooms during the last three months or so through these picture essay that follow. It's unfortunate, I don't get to do this for my Live Virtual Classes for obvious reason,but let me take a moment to thank them all as well for choosing OU programs on various products. Thanks again to each one for memorable moments in the OU classrooms: Pillar Axiom MaxRep session at Bangkok. For detailed information on the OU course on Pillar Axiom Max Rep, access this page. Pillar Axiom SAN Administration Session at Bangkok. Know more about the product here. Details on the Pillar Axiom training program from Oracle University can be found here. Oracle Solaris ZFS Administration & Oracle Solaris Containers session at Hyderabad. Read more about ZFS here. Gain information on Solaris Containers by going here. Oracle University courses on Solaris 10 and its features can be viewed at this page. Oracle Solaris Cluster program at Hyderabad. Here's the OU landing page for the training programs on Oracle Solaris Cluster. Oracle Solaris 11 Administration Session at Bangalore. If you are interested to get trained on Solaris 11, get more details at this webpage. Sun Identity Manager Deployment Fundamentals session at Bangalore. The product is n.k.a Oracle Waveset IDM. Click here to get detailed description on this fabulous hands on training program. With Don Kawahigashi at Taipei for Pillar Axiom Storage training.

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  • Virtualised Sharepoint Backup Strategies

    - by dunxd
    I have a Sharepoint (OSS 2007) farm running on three virtual machines in VMWare ESX, plus a SQL Server backend on physical hardware. During a recent Business Continuity Planning event I tried restoring the sharepoint farm with only the config and content databases, and failed to get things working. My plan was to build a new sharepoint server, then attach this to a restoration config database and install the Central Management site on this server, then reattach the content databases. This failed at the Central Management part of the plan. So I am back to the drawing board on the best strategy for backup and recovery, with reducing the time and complexity of the restore job the main objective. I haven't been able to find much in the way of discussion of backup/restore strategies for Sharepoint in a VMWare environment, so I figured I'd see if anyone on server fault has any ideas or experience.

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  • zip being too nice (Mac OS X)

    - by stib
    I use zip to do a regular backup of a local directory onto a remote machine. They don't believe in things like rsync here, so it's the best I can do (?). Here's the script I use echo $(date)>>~/backuplog.txt; if [[ -e /Volumes/backup/ ]]; then cd /Volumes/Non-RAID_Storage/; for file in projects/*; do nice -n 10 zip -vru9 /Volumes/backup/nonRaidStorage.backup.zip "$file" 2>&1 | grep -v "zip info: local extra (21 bytes)">>~/backuplog.txt; done; else echo "backup volume not mounted">>~/backuplog.txt; fi This all works fine, except that zip never uses much CPU, so it seems to be taking longer than it should. It never seems to get above 5%. I tried making it nice -20 but that didn't make any difference. Is it just the network or disc speeds bottlenecking the process or am I doing something wrong?

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  • CPU Wars Is a Trump-Style Card Game Driven by Chip Stats

    - by Jason Fitzpatrick
    If you’re looking for the geekiest card game around, you’d be hard pressed to beat CPU Wars–a top-trumps card game built around CPU specs. From the game’s designers: CPU Wars is a trump card game built by geeks for geeks. For Volume 1.0 we chose 30 CPUs that we believe had the greatest impact on the desktop history. The game is ideally played by 2 or 3 people. The deck is split between the players and then each player takes a turn and picks a category that they think has the best value. We have chosen the most important specs that could be numerically represented, such as maximum speed achieved and maximum number of transistors. It’s lots of fun, it has a bit of strategy and can be played during a break or over a coffee. If you’re interested, you can pick up a copy for £7.99 (roughly $12.50 USD). Hit up the link below for more information. How To Customize Your Wallpaper with Google Image Searches, RSS Feeds, and More 47 Keyboard Shortcuts That Work in All Web Browsers How To Hide Passwords in an Encrypted Drive Even the FBI Can’t Get Into

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  • Design Application to "Actively" Invite Users (pretend they have privileges)

    - by user3086451
    I am designing an application where users message one another privately, and may send messages to any Entity in the database (an Entity may not have a user account yet, it is a professional database). I am not sure how to best design the database and the API to allow messaging unregistered users. The application should remain secure, and data only accessed by those with correct permissions. Messages sent to persons without user accounts serve as an invitation. The invited person should be able to view the message, act on it, and complete the user registration upon receiving an InviteMessage. In simple terms, I have: User misc user fields (email, pw, dateJoined) Entity (large professional dataset): personalDetails... user->User (may be null) UserMessage: sender->User recipient->User dateCreated messageContent, other fields..... InviteMessage: sender->User recipient->Entity expiringUrl inviteeEmail inviteePhone I plan to alert the user when selecting a recipient that is not registered yet, and inform that he may send the message as an invitation by providing email, phone where we can send the invitation. Invitations will have a unique, one-time-use URL, e.g. uuid.uuid4(). When accessed, the invitee will see the InviteMessage and details about completing his/her registration profile. When registration is complete, InviteMessage details to a new instance of UserMessage (to not lose their data), and assign it to the newly created User. The ability to interact with and invite persons who do not yet have accounts is a key feature of the application, and it seems better to separate the invitation from the private, app messages (easier to keep functionality separate, better if data model changes). Is this a reasonable, good design? If not, what would you suggest? Do you have any improvements? Am I correct to choose to create a separate endpoint for creating invitations via the API?

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  • WebLogic 12 hands-on bootcamps for partners–new dates & locations

    - by JuergenKress
    We offer free 2 days hands-on WebLogic 12c workshops for Oracle partners who want to become WebLogic Specialized: Register Here! Highlights of the workshop Quotes from previous Workshops Environment Setup and Weblogic Installation hands-on lab Weblogic Session Sharing hands-on lab Coherence hands-on lab WLS Session Replication with Coherence Web hands-on lab Weblogic Troubleshooting hands-on lab Weblogic JMS hands-on lab Exalogic & Oracle Cloud overview Oracle Enterprise Manager overview Oracle trainings are the best" Pedro Neto Novabase "Excellent training, well organized" Pedro Antunh, Capgemini "This course dives you into Oracle WebLogic giving you a quick start on benefiting from Fusion Apps" Leonardo Fernandes, Outsystems The event dates are following: Belgium 3rd - 4th October 2012 Oracle Vilvoorde South Africa 3rd –4th October 2012 Oracle Johannesburg Switzerland 25th - 26th October 2012 Oracle Baden-Dättwil Denmark 30th - 31st October 2012 Oracle Ballerup Norway 6th - 7th November 2012 Oracle Lysaker Netherlands 18th - 20th December 2012 Oracle Utrecht WebLogic Partner Community For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. BlogTwitterLinkedInMixForumWiki Technorati Tags: WebLogic Bootcamp,WebLogic training,education,training,PTS,WebLogic Community,Oracle,OPN,Jürgen Kress

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  • Java game object pool management

    - by Kenneth Bray
    Currently I am using arrays to handle all of my game objects in the game I am making, and I know how terrible this is for performance. My question is what is the best way to handle game objects and not hurt performance? Here is how I am creating an array and then looping through it to update the objects in the array: public static ArrayList<VboCube> game_objects = new ArrayList<VboCube>(); /* add objects to the game */ while (!Display.isCloseRequested() && !Keyboard.isKeyDown(Keyboard.KEY_ESCAPE)) { for (int i = 0; i < game_objects.size(); i++){ // draw the object game_objects.get(i).Draw(); game_objects.get(i).Update(); //world.updatePhysics(); } } I am not looking for someone to write me code for asset or object management, just point me into a better direction to get better performance. I appreciate the help you guys have provided me in the past, and I dont think I would be as far along with my project without the support on stack exchange!

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  • Setting up an Active-Active IIS Cluster with ARR - is it possible?

    - by Ahmed Zubair
    I would like to know if we can setup an Active-Active IIS Cluster using Windows Cluster services that shares a common storage to store web content and WITHOUT the use of Windows NLB. I'm aware that this may not be a best practice or not a recommended setup, however, the setup is to be configured as below: Two web servers running IIS 7.5 (needs a common storage for web content) for HA and another set of two servers for sql cluster in active-passive mode for HA. Also is it possible to enable ARR on 2 node active-active IIS cluster for load balancing http requests? Appreciate if someone replies with both pros & cons of the setup.

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  • Oracle University Seminars April/May/June 2012

    - by A&C Redaktion
    Normal 0 21 false false false DE X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} Oracle University's Expert Seminars are exclusive events delivered by top experts with years of experience in working with Oracle products. The seminars topics cover the breadth of the Oracle portfolio and are aimed at helping you to get the most of your Oracle products and to stay connected with new technologies. We currently have the following events scheduled: RAC Performance Tuning Online with Arup Nanda - 30 Apr 2012 Understanding Explain Plans & Index Utilization Online with Dan Hotka - 8-9 May 2012 Writing Optimal SQL & Troubleshooting & Tuning with Jonathan Lewis, Düsseldorf, 9-10 May 2012 Flashback Techniques in Oracle11g with Carl Dudley, München, 14 May 2012 Minimize Downtime with Rolling Upgrade using Data Guard with Uwe Hesse, München, 16 May 2012 Enterprise Business Intelligence 11g Advanced Development Online with Mark Rittman – 24-25 May Mastering Backup & Recovery with Francisco Munoz Alvarez, Düsseldorf, 29-30 May 2012 Real World Java EE 6 – Re-thinking Best Practice with Adam Bien, München, 15 Jun 2012

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  • Weighted round robins via TTL - possible?

    - by Joe Hopfgartner
    I currently use DNS round robin for load balancing, which works great. The records look like this (I have a ttl of 120 seconds) ;; ANSWER SECTION: orion.2x.to. 116 IN A 80.237.201.41 orion.2x.to. 116 IN A 87.230.54.12 orion.2x.to. 116 IN A 87.230.100.10 orion.2x.to. 116 IN A 87.230.51.65 I learned that not every ISP / device treats such a response the same way. For example some DNS servers rotate the addresses randomly or always cycle them through. Some just propagate the first entry, others try to determine which is best (regionally near) by looking at the ip address. However if the userbase is big enough (spreads over multiple ISPs etc) it balances pretty well. The discrepancies from highest to lowest loaded server hardly every exceeds 15%. However now I have the problem that I am introducing more servers into the systems, that not all have the same capacities. I currently only have 1gbps servers, but I want to work with 100mbit and also 10gbps servers too. So what I want is I want to introduce a server with 10 GBps with a weight of 100, a 1 gbps server with a weight of 10 and a 100 mbit server with a weight of 1. I used to add servers twice to bring more traffic to them (which worked nice. the bandwidth doubled almost.) But adding a 10gbit server 100 times to DNS is a bit rediculous. So I thought about using the TTL. If I give server A 240 seconds ttl and server B only 120 seconds (which is about about the minimum to use for round robin, as a lot of dns servers set to 120 if a lower ttl is specified.. so i have heard) I think something like this should occour in an ideal scenario: first 120 seconds 50% of requests get server A -> keep it for 240 seconds. 50% of requests get server B -> keep it for 120 seconds second 120 seconds 50% of requests still have server A cached -> keep it for another 120 seconds. 25% of requests get server A -> keep it for 240 seconds 25% of requests get server B -> keep it for 120 seconds third 120 seconds 25% will get server A (from the 50% of Server A that now expired) -> cache 240 sec 25% will get server B (from the 50% of Server A that now expired) -> cache 120 sec 25% will have server A cached for another 120 seconds 12.5% will get server B (from the 25% of server B that now expired) -> cache 120sec 12.5% will get server A (from the 25% of server B that now expired) -> cache 240 sec fourth 120 seconds 25% will have server A cached -> cache for another 120 secs 12.5% will get server A (from the 25% of b that now expired) -> cache 240 secs 12.5% will get server B (from the 25% of b that now expired) -> cache 120 secs 12.5% will get server A (from the 25% of a that now expired) -> cache 240 secs 12.5% will get server B (from the 25% of a that now expired) -> cache 120 secs 6.25% will get server A (from the 12.5% of b that now expired) -> cache 240 secs 6.25% will get server B (from the 12.5% of b that now expired) -> cache 120 secs 12.5% will have server A cached -> cache another 120 secs ... i think i lost something at this point but i think you get the idea.... As you can see this gets pretty complicated to predict and it will for sure not work out like this in practice. But it should definitely have an effect on the distribution! I know that weighted round robin exists and is just controlled by the root server. It just cycles through dns records when responding and returns dns records with a set propability that corresponds to the weighting. My DNS server does not support this, and my requirements are not that precise. If it doesnt weight perfectly its okay, but it should go into the right direction. I think using the TTL field could be a more elegant and easier solution - and it deosnt require a dns server that controls this dynamically, which saves resources - which is in my opinion the whole point of dns load balancing vs hardware load balancers. My question now is... are there any best prectices / methos / rules of thumb to weight round robin distribution using the TTL attribute of DNS records? Edit: The system is a forward proxy server system. The amount of Bandwidth (not requests) exceeds what one single server with ethernet can handle. So I need a balancing solution that distributes the bandwidth to several servers. Are there any alternative methods than using DNS? Of course I can use a load balancer with fibre channel etc, but the costs are rediciulous and it also increases only the width of the bottleneck and does not eliminate it. The only thing i can think of are anycast (is it anycast or multicast?) ip addresses, but I don't have the means to set up such a system.

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  • How do I set permissions structure for multiple users editing multiple sites in /var/www on Ubuntu 9

    - by Michael T. Smith
    I'm setting up an Ubuntu server that will have 3 or 4 VirtualHosts that I want users to be able to work in (add new files, edit old files, etc.). I currently plan on storing the sites in /var/www but wouldn't be opposed to moving it. I know how to add new users, I know how to add new groups. I'm unsure of the best way to handle users being only able to edit some sites. I read over the answers here in this question, so I was thinking I could setup a group and add users to that group, but then they'd all have essentially the same permissions. Am I just going to have to assign each user specific permissions? Or is there a better way of handling this? Added: I should also note, that I'll have each user login in via SSH/sFTP. The users would never need to do anything else on the server.

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  • How do I choose the scaling factor of a 3D game world?

    - by concept3d
    I am making a 3D tank game prototype with some physics simulation, am using C++. One of the decisions I need to make is the scale of the game world in relation to reality. For example, I could consider 1 in-game unit of measurement to correspond to 1 meter in reality. This feels intuitive, but I feel like I might be missing something. I can think of the following as potential problems: 3D modelling program compatibility. (?) Numerical accuracy. (Does this matter?) Especially at large scales, how games like Battlefield have huge maps: How don't they lose numerical accuracy if they use 1:1 mapping with real world scale, since floating point representation tend to lose more precision with larger numbers (e.g. with ray casting, physics simulation)? Gameplay. I don't want the movement of units to feel slow or fast while using almost real world values like -9.8 m/s^2 for gravity. (This might be subjective.) Is it ok to scale up/down imported assets or it's best fit with a world with its original scale? Rendering performance. Are large meshes with the same vertex count slower to render? I'm wondering if I should split this into multiple questions...

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  • ADFS 2.0 and CRM 2011 IFD - Error 403 when being redirected

    - by JohnThePro
    I'm not sure what happened here, but let me give you the rundown. I have a CRM 2011 IFD that by all accounts was functioning. Out of nowhere, I find that when being redirected to ADFS 2.0 login page by CRM, instead of seeing the login page, I get the following error: 403 - Forbidden: Access is denied. You do not have permission to view this directory or page using the credentials that you supplied. I'm not sure what is going on here. The certs are good, as best as I can tell, the logins are good. More specifically, nothing has been modified. This all worked just fine, and now it doesn't. I'm really stumped.

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  • Is Movable Type among the most secure PHP blogs? How secure are the various PHP blog applications?

    - by user6025
    Basically I'm trying to find a blog for a website, and security is the highest priority in our case. We don't need any features that I would imagine are special. Wordpress was our first idea, but its reputation precedes it, and though it may have cleaned up its act lately, I'm not seeing much solid evidence. I get the impression that Movable Type (at least the Perl version) has a much better reputation for security than Wordpress (historically at least). I'm not sure I want to take a chance with Wordpress at this point, but is there some objective source I can got to to back up (or counter) the notion that MT is at least among the best? Secunia doesn't recommend using their stats for comparisons, and securityfocus.com doesn't have stats at all that I can see. Searching here http://web.nvd.nist.gov makes MT look way better than WP (at least in 2007), but this site was referenced by MT's own page boasting about their security, so I don't know how relevant it is or how seriously people take it. Any suggestions on sites where I could/should make a somewhat objective comparison?

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  • Spirent Communications Improves Customer Experience with Knowledge Management

    - by Tony Berk
    Spirent Communications plc is a global leader in test and measurement inspiring innovation within development labs, communication networks and IT organizations. The world’s leading communications companies rely on Spirent to help design, develop, validate, and deliver world-class network, devices, and services. Spirent’s customers require high levels of support for a diverse and complex product portfolio, and the company is committed to delivering on this requirement. Spirent needed a solution to help its customers get the information they need quickly and at their convenience through its Web site. After evaluating several solutions, Spirent selected and deployed Oracle Knowledge for Web Self Service Enterprise Edition. Oracle Knowledge Management uses natural language processing to understand the true intent of each inquiry logged via the support portal’s search function. The Spirent Knowledge Base on the company’s Customer Support Center (CSC) finds the best possible answer using search enhancement features?such as communications industry-specific libraries and federation to search external sources. Spirent has reduced contact center call volume while better serving its customers. Each time a customer uses the knowledge base, they find answers faster than by calling, and it saves Spirent an average of US$210 per call?which is significant when multiplied across the thousands of calls received monthly. Oracle Knowledge also helps support engineers find answers more quickly, enabling the company to scale without adding additional support engineers. Oracle Knowledge is integrated with Spirent's Siebel Contact Center implementation to provide an integrated desktop for CRM and agent intelligence, avoiding the need for contact center personnel to toggle between various screens to address customer inquiries, thereby accelerating customer service. Click here to learn more about Sprient's use of Siebel CRM and Oracle Knowledge Management.

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