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• Keep printed documents on Windows Server 2008 R2 Print Server

  - by MadBoy

  I've setup Windows 2008 R2 as print server. I have checked option Keep printed document option for all printers and it works fine. Users print their stuff and i can see what they are doing. Problem is everyone sees all documents that are getting printed which is not always the best idea. Is there a way to: Limit print jobs to be only seen by people who printed them and admins Limit print jobs to be only seen on server (from within Server Manager) and so print jobs dissapear when print job is done from user queue (but then admins are still able to see it and track what's printed and when for reporting purposes). Create some kind of access level list so that some people can see everything geting printed, some people see their print jobs and some people see nothing :-)

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• Which of these design patterns is superior?

  - by durron597

  I find I tend to design class structures where several subclasses have nearly identical functionality, but one piece of it is different. So I write nearly all the code in the abstract class, and then create several subclasses to do the one different thing. Does this pattern have a name? Is this the best way for this sort of scenario? Option 1: public interface TaxCalc { String calcTaxes(); } public abstract class AbstractTaxCalc implements TaxCalc { // most constructors and fields are here public double calcTaxes(UserFinancials data) { // code double diffNumber = getNumber(data); // more code } abstract protected double getNumber(UserFinancials data); protected double initialTaxes(double grossIncome) { // code return initialNumber; } } public class SimpleTaxCalc extends AbstractCalc { protected double getNumber(UserFinancials data) { double temp = intialCalc(data.getGrossIncome()); // do other stuff return temp; } } public class FancyTaxCalc extends AbstractTaxCalc { protected double getNumber(UserFinancials data) { int temp = initialCalc(data.getGrossIncome()); // Do fancier math return temp; } } Option 2: This version is more like the Strategy pattern, and should be able to do essentially the same sorts of tasks. public class TaxCalcImpl implements TaxCalc { private final TaxMath worker; public DummyImpl(TaxMath worker) { this.worker = worker; } public double calcTaxes(UserFinancials data) { // code double analyzedDouble = initialNumber; int diffNumber = worker.getNumber(data, initialNumber); // more code } protected int initialTaxes(double grossIncome) { // code return initialNumber; } } public interface TaxMath { double getNumber(UserFinancials data, double initial); } Then I could do: TaxCalc dum = new TaxCalcImpl(new TaxMath() { @Override public double getNumber(UserFinancials data, double initial) { double temp = data.getGrossIncome(); // do math return temp; }); And I could make specific implementations of TaxMath for things I use a lot, or I could make a stateless singleton for certain kinds of workers I use a lot. So the question I'm asking is: Which of these patterns is superior, when, and why? Or, alternately, is there an even better third option?

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• Learning C, C++ and C#

  - by Zac

  I'm sure you guys are tired of this question but after wading through hours of similar posts and questions I've really not made any progress to my specific concerns. I was hoping you guys could shed some light on a couple of questions I have before I decide on a course of action. BACKGROUND: I'm wanting to enroll in some type of program to learn a programming language/get a certificate/degree to work in the field. I've always been interested and bought a book on VB back in high school and dabbled. Now I want to get serious after a huge hiatus. Question 1: I've read it's counter-productive to learn C first, then C++ or C# because you develop bad habits. In a lot of college courses I've looked at, learning C/C++ is mandatory to advance. Should I ever bother learning C? On a related note, I really don't understand the difference between C and C++, or C# for the matter other than it incorporates .NET (which, I understand, is a compilation of tools and libraries that make programming easier and faster). Question 2: Where did you guys learn to program? Where do you recommend? Is it possible to land a job programming being self-taught? Is my best chance an ITT tech or a regular college? I was going to enroll in a JC and go from there but I can't decide what to do. LAST question :) I heard C++ is being "ported" to .NET. True? And if so, is this going to make C++ a solid, in-demand language to learn? Thanks for looking. :)

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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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• Node.JS testing with Jasmine, databases, and pre-existing code

  - by Jim Rubenstein

  I've recently built the start of a core system which is likely going turn into a monster product. I'm building the system with node.js, and decided after I got a small base built, that It'd be a great idea to start using some sort of automated test suite to test the application. I decided to use jasmine, as it seems pretty solid and has a lot of features for stubbing spying and mocking methods and classes. The application has a lot of external data stores and api access (kestrel, mysql, mongodb, facebook, and more). My issue is, I've got a good amount of code written that I want to start testing - as it represents the underpinnings of the application. What are the best practices for testing methods/classes that access external APIs that I may or may not have control over? As an example, I have a data structure that fetches a bunch of data from a MySQL database. I want to test the method that retrieves the data; and I'm not sure how to go about it. I could test the fetch method which is supposed to return an array of objects, but to isolate the method from the database, I need to define my own fixture data. So what I end up doing is stubbing the mysql execution, and returning a static dataset. So, I end up writing a function that returns the dataset that makes my test pass. That doesn't seem to actually test the code, other than verifying a method is being called. I know this is kind of abstract and vague, it seems that the idea of testing is very much abstract though, so hopefully someone has some experience and can guide me in the right direction. Any advice, or reading I can do is more than welcomed. Thanks in advance.

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• How to either completely remove SQL Server 2008 R2 Installation or repair it?

  - by Nico

  I've installed MSSQL server correctly, then I took some wrong turns and I'm now left in a pretty undesirable state. I wanted to change the server instance to another drive, so I uninstalled SQL server and all of it's features from the Programs and Features control panel. Now when I tried to install a new instance, I got a few errors, but it still installed most of them: Then I tried to run a repair, which I figured would fix things, but it throws an exception about not being able to read something from the CD (tried more than once always the same exception) Error 1316.A network error occurred while attempting to read from the file R:\1033_ENU_LP\x64\setup\SSCERuntime_x86-enu.msi , and it fails to repair a few of the features: And I don't have the server instance installed either. So I'm left with no MSSQLMS, no server instance, and no happiness. What would be the best course of action here?

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• Oracle eAM Webcast Series Announced (May-Dec 2010)

  - by [email protected]

  A series of free webinars with ReliabilityWeb will present key product capabilitiesof Oracle eAM and how they support maintenance and reliability best practices. Through this web-seminar series,companies can understand how to achieve better ROI. ReliabilityWeb will be using this as a key component of their initiative tobuild a stronger Oracle community.  For Oracle this program demonstrates leadership and commitment to the Maintenance SystemsMarketplace. Topics: (note all times are EAST)1. How can Oracle eAM enhance and support your reliability program? (May 13,2010) (1-2PM - all times East)) 2. Upgrading to Oracle eAM R12  - What's the value, when's the right time,what's involved and how do you get there? (June 17, 2010) (1-2PM) 3. Improving maintenance and reliability by aligning people, processes andsystems. (July 15, 2010) (1-2PM) 4. Using Oracle eAM to drive your Condition Based Maintenance program. (July29, 2010) (1-2PM) 5. Why and how do you get the power of Oracle eAM out to the people that arereally doing maintenance the technicians. (August 12, 2010) (1-2PM) 6. Standardizing and streamlining your maintenance work with Oracle eAM.(September 16, 2010 (1-2PM) 7. Standardizing maintenance and reliability data - How do you get there?(October 21, 2010 (1-2PM) 8. Using Oracle eAM to establish a Failure Reporting and Corrective ActionSystems (FRACAS). (November 18, 2010) (1-2PM)9. Maintenance Work Scheduling in Oracle eAM - Capabilities and Limitations(December 16, 2010) (1-2PM)to Register:   <http://img.gotomeeting.com/g2mimages/1x1.gif> <http://www1.gotomeeting.com/g2w/images/298420256/73664767535782300/embed.jpg>For additional information contact Jay West, EAM Master,+1.205.515.4326            

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• Created User in Linux (Ubuntu) Without Creating a Home Directory - Causing Problems

  - by nicorellius

  This may be a rookie mistake, but I created a user (new user) in Linux on a Ubuntu system and didn't actually create the home directory for this user. Now, when I log in, it says there are problems... If I delete the path home/<new user> and try to log in the system tells me I can use root as home directory but I will likely experience problems, and then it won't let me log in. What is the best way to create this directory with the appropriate permissions? Should I just create another user and delete this one? I need some help...

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• Mac OSX Server 10.6 DNS Issues

  - by dallasclark

  The server was upgraded from 10.5 from 10.6, during the upgrade the Reverse Zones were lost so I tried to recreate these but found that it's best to delete all zones, definitions and start again. So I've started again and Reverse Zones are appearing but I'm still having issues. I receive the following errors (if they help) 01-Nov-2010 12:52:01.254 client 192.168.1.52#57051: view com.apple.ServerAdmin.DNS.public: query (cache) 'server.dev.home.gateway/A/IN' denied 01-Nov-2010 12:59:24.487 client 192.168.1.52#52858: view com.apple.ServerAdmin.DNS.public: query (cache) 'earth.server.dev.home.gateway/A/IN' denied At the moment I have the following setup in the DNS 1.168.192.in-addr.arpa. Reverse Zone 192.168.1.100 Reverse Mapping MacPro-Server.local. server.dev. Primary Zone server.dev. Machine 192.168.1.100 earth.server.dev. Alias server.dev.

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• EC2 instance store cloning or to ebs via guy management console

  - by devnull

  I have found similar questions here but the answer are either outdated or are from the command line. The case is this. I have an EC2 instance using instance store (this was the only AMI available for Debian 6 in Ireland). Now through the AWS GUI I can do a snapshot of the instance volume and/or even create a volume. But an image made from the snapshot doesn't boot. What is the best solution to either clone an EC2 instance that uses instance store OR from the created snapshot of the instance store to launch a new EBS instance (identical clone) FROM the gui aws management console and not command line ? Before turning this down consider that there is not similar question on how to do it via the aws management console. hint can't be done is not an appropriate answer. As you can create a snapshot of the instance store backed instance and/or a volume and create an AMI from that snapshot.

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• Developing professionally for both iOS, Android, web - an insight

  - by Scott Roberts

  This is not really a question on how to develop for both, I know various cross platform ways and so on. But I more want to know from developer standpoint how hard it is to basically develop iOS, Android and web apps? I am currently in my first job as a mobile/web developer. I have already developed my first iPhone/iPad app and now I have to develop the app for android because the web version I tried just didn't perform as well as needed and web databases just did not seem to make the cut. But I am not sure it's possible to be good at developing all 3 in terms of remembering all the api's etc. I wouldn't say I have an issue with the programming languages just how to use the api's for the various platforms. Also, all the other languages I look at, in my spare time, just feel like I am spreading myself to thin. Is it feasible for one person to be developing ios, android and web apps? Should I think about reducing it to iOS and web based apps? I develop everything by myself, so I have no one to discuss what the best solutions are for everything and I am just trying to workout as I go along. So any cross platform developers out there? Do companies have different teams for different platforms? Any insight would just help me get my head together. Hopefully this question makes sense.

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• Inserting HTML code with jquery

  - by J. Robertson

  One of our web applications is a page that takes in a serial number and various information is returned and displayed to the user. The serial is passed via AJAX, and based on the response, one of the following can happen - An error message is shown A new form replaces the previous form Now, the way I am handling this is to use jQuery to destroy (using $.remove()) the table that displayed the initial serial form, then I'm appending another html table that contains another form. Right now I am including that additional form as part of the html source, and just setting it to display:none, then using jQuery to show it when appropriate. However, I don't like this approach because if someone views source on the page, they can see that table html code that is not being displayed. My next thought would be to use AJAX to read in another HTML file, and append it that way. However, I am trying to keep down the number of files this project uses, and since most pages in our project will use AJAX, I could see a case where there are multiple files containing HTML snippets - and that feels sloppy to me. What is the best way to handle a case where multiple html elements are being shown and removed with jQuery?

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• What is the ideal length of a method?

  - by iPhoneDeveloper

  In object-oriented programming, there is no exact rule on the maximum length of a method , but I still found these two qutes somewhat contradicting each other, so I would like to hear what you think. In Clean Code: A Handbook of Agile Software Craftsmanship, Robert Martin says: The first rule of functions is that they should be small. The second rule of functions is that they should be smaller than that. Functions should not be 100 lines long. Functions should hardly ever be 20 lines long. and he gives an example from Java code he sees from Kent Beck: Every function in his program was just two, or three, or four lines long. Each was transparently obvious. Each told a story. And each led you to the next in a compelling order. That’s how short your functions should be! This sounds great, but on the other hand, in Code Complete, Steve McConnell says something very different: The routine should be allowed to grow organically up to 100-200 lines, decades of evidence say that routines of such length no more error prone then shorter routines. And he gives a reference to a study that says routines 65 lines or long are cheaper to develop. So while there are diverging opinions about the matter, is there a functional best-practice towards determining the ideal length of a method for you?

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• What is the way to submit a patch to fix all the damage that LP: #600941 causes?

  - by nutznboltz

  What is the best way to submit a patch to fix all the damage that LP: #600941 causes? I ask because LP: #600941 was put into every version of Ubuntu still supported at this time. Should I pick a particular version and run ubuntu-bug on it? Should that version be the LTS or Oneiric or Precise (how can I get Precise if I need it?) The story is that after it was pushed out all of our systems started experiencing Nagios nrpe restart failures. Commands like /etc/init.d/nagios-nrpe-server restart would cause nrpe to stop but not restart. I tracked this down to the way that the /etc/init.d/nagios-nrpe-server script is calling start-stop-daemon. The issue is that the "stop" stanza in the /etc/init.d/nagios-nrpe-server script first calls start-stop-daemon which sends SIGTERM to nrpe and then waits only for one second. If nrpe has not exited by that time the pid file will still exist and the /etc/init.d/nagios-nrpe-server script will remove it. Worse if /etc/init.d/nagios-nrpe-server restart is used not only will the pid file be removed, the attempt to restart nrpe will fail provided that the nrpe daemon is still tardy in shutting down. The attempt to start under those circumstances will fail because nrpe will still be bound to a socket and the second attempt at binding will cause the nrpe startup to abort. They should have wondered why there was a comment about "sometimes the pid file does not get removed". They should have tested on systems that have a heavy load and therefore slow nrpe response times. The fix is to add --retry 10 or such to the invocation of start-stop-daemon ... --stop ... Thanks

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• Manager Self Service at your Fingertips

  - by Elaine Clement

  Last week we released new and improved Manager Self Service capabilities in PeopleSoft HCM 9.1. We delivered a new Manager Dashboard, streamlined many Manager Self Service transactions, provided new Pivot Grid capabilities, and implemented one-click Related Actions accessible from multiple places – all with the goal of improving every Manager’s self service experience. Manager Dashboard These new capabilities have the potential to significantly impact an organization’s bottom line, and here is why. Increased Efficiency The Manager Dashboard provides a ‘one-stop shop’ for your Managers with all of the key data they need consolidated into a single view. Alerts notifying managers of important tasks are immediately viewable and actionable. Administrators can configure the dashboard to include the most important pagelets needed for their organization, and Managers can personalize it to fit within their personal way of conducting their tasks. The Related Actions feature further improves the ease with which Managers get their work done by providing one-click access to Manager Self Service transactions.  Increased Job Satisfaction The streamlined Manager transactions, related actions, and the new Manager Dashboard provide an enhanced user experience. Managers are able to quickly get in, get the information they need, complete their transactions, and get out. Managers can spend their time focusing on getting the business results they need instead of their day to day HR tasks. Enhanced Decision Support Administrators can ensure the information and analytics they want their Managers to use are available from the Manager Dashboard, establishing best business practices. Additional pivot grids relevant to your own organization can be added to the Manager Dashboard. With this easy access to the relevant information in an easily understood format, Managers can make the right business decisions needed to improve their team and their team’s productivity. For more details on the Manager Dashboard and some of the other newly posted features, such as a new Talent Summary, check out this video and others: Oracle PeopleSoft Webcasts

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• Azure eBook Update #1 &ndash; 16 authors so far!

  - by Eric Nelson

  I just wanted to share with folks where we are up to with the Windows Azure eBook (Check out the original post for full details) I have had lots of great submissions from folks with some awesome stuff to share on Azure. Currently we have 16 authors and 25 proposed articles. There is still a couple of days left to submit your proposal if you would like to get involved (see the original post ) and some topic suggestions below for which we don’t currently have authors. It is official – I’m excited! :-) Article Area Accepted Wikipedia Explorer: A case study how we did it and why. CaseSetudy Optional Patterns for the Windows Azure Platform (picking up 1 or 2 patterns that seem to be evolving) Architecture Optional Azure and cost-oriented architecture. Architecture Yes Code walkthrough of a comprehensive application submitted to newCloudApp contest CaseSetudy Yes Principles of highly scalable apps on Azure Compute Optional Auto-Scaling Azure Compute Yes Implementing a distributed cache using memcached with worker roles Interop Yes Building a content-based router service to direct requests to internal HTTP endpoints Compute Optional How to debug an Azure app by with a custom TraceListener & the AppFabric Service Bus AppFabric Yes How to host Java apps in Azure Interop Yes Bing Maps Tile Servers using Azure Blog Storage Interop Yes Tricks for storing time and date fields in Table Storage Storage Yes Service Runtime in Windows Azure Compute Yes Azure Drive Storage Optional Queries in Azure Table Storage Optional Getting RubyOnRails running on Azure Interop Yes Consuming Azure services within Windows Phone Interop Yes De-risking Your First Azure Project Architecture Yes Designing for failure Architecture Optional Connecting to SQL Azure In x Minutes SQLAzure Yes Using Azure Table Service as a NoSQL store via the REST API Storage Yes Azure Table Service REST API Storage Optional Threading, Scalability and Reliability in the Cloud Compute Yes Azure Diagnostics Compute Yes 5 steps to getting started with Windows Azure Introduction Yes The best tools for working with Windows Azure Tools Author Needed Understanding how SQL Azure works SQLAzure Author Needed Getting started with AppFabric Control Services AppFabric Author Needed Using the Microsoft Sync Framework with SQL Azure SQLAzure Author Needed Dallas - just a TV show or something more? Dallas Author Needed Comparing Azure to other cloud offerings Interop Author Needed Hybrid solutions using Azure and on-premise Interop Author Needed

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• Linux - Scriptable email client?

  - by Phog

  Hi, I'm writing a simple UI for the visually impaired using a speech synthesizer. I've looked all over the internet for an email client which I can script to fit these purposes but to no avail. I believe several CLI email clients(eg MUTT) allow sending emails with command line arguments only. But I've yet to find a client that can download the emails, decode them and then dump them to a text file. The best candidate so far seems to be mailx, but it seems like it needs quite a lot of babysitting to fit my needs. Any suggestions for scripting-friendly email clients? Am I missing something fundamental about MUTT? Are there any libraries/programs that help me decode the MIME encoding used in todays emails from a maildir? Should I just bite the bullet and write a script for mailx? Thanks in advance.

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• Is it possible to re-lock a bitlocker drive?

  - by Sean Edwards

  I'm running a partition with bitlocker on a Windows 7 Ultimate machine, which contains secure data that I have to recover infrequently. Unlocking it to access the data is obviously no problem, but is there a way to re-lock the partition when I'm done? The best I've found so far is this: http://social.technet.microsoft.com/Forums/en-US/w7itprosecurity/thread/41607938-7452-440d-8253-67fe8657bc0f Currently I have a .bat script on that drive that I can run as administrator, and that re-locks the drive, but it feels like kind of a hackish solution. Does anyone have anything better? Any idea when Microsoft might release a fix for this?

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• Cloud Summit - Mut zur Cloud!

  - by A&C Redaktion

  Alle sprechen über Cloud Computing. Ob Private, Public oder Hybrid Cloud, die Vorteile bleiben: schnelleres und günstigeres Arbeiten. Ist das nun nur ein Hype, der in ein paar Jahren überholt ist? Oder ist Cloud Computing eine Investition, die sich langfristig für Ihr Unternehmen lohnt? Bei dieser Entscheidung können Ihnen unsere Experten von Oracle helfen. In ganztägigen Oracle Enterprise Cloud Summits stellen sie im März in mehreren deutschen Städte Strategien und Nutzungsmöglichkeiten der Cloud vor. Das sind unsere Themen: Design einer State-of-the-Art Cloud Architektur Weiternutzung bestehender IT-Investitionen Optimierung von IT-Managementprozessen Verbesserung der Flexibilität des Data Centers Schnelle Umschichtung von IT-Ressourcen bei wechselnden Anforderungen durch das Business Außerdem haben Kunden und Partner dort die Möglichkeit, das Oracle Portfolio für die Enterprise Cloud kennen zu lernen. Anhand von Best Practice Beispielen ausgesuchter Unternehmen können unsere Partner herausfinden, welche Anwendungen für sie von Vorteil sind. Und Sie haben die Möglichkeit, gemeinsam mit unseren Fachleuten die richtige Strategie zu überlegen, um Cloud Computing für Ihr Unternehmen optimal zu nutzen. Der Oracle Enterprise Cloud Summit in Ihrer Nähe: Hannover: 2. März 2011, Robotation Academy, CeBIT, MessegeländeHannover: 3. März 2011, Robotation Academy, CeBIT, MessegeländeFrankfurt: 15. März 2011, Palais im ZooMünchen: 22. März 2011, Allianz ArenaWeitere Termine, u.a. in Österreich und der Schweiz, finden Sie hier.

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• Recommended website performance monitoring services? [closed]

  - by Dennis G.

  I'm looking for a good performance monitoring service for websites. I know about some of the available general monitoring services that check for uptime and notify you about unavailable services. But I'm specifically looking for a service with an emphasis on performance. I.e., I would like to see reports with detailed performance statistics from multiple locations world-wide, with a break-down on how long it took to fetch the different website resources, including third-party scripts such as Google Analytics and so on (the report should contain similar details such as the FireBug Net tab). Are there any such services and if so, which one is the best?

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• ASP.NET MVC WebService - Security for Industrial Android Clients

  - by Chris Nevill

  I'm trying to design a system that will allow a bunch of Android devices to securely log into an ASP.NET MVC REST Web service. At present neither side are implemented. However there is an ASP.NET MVC website which the web service will site along side. This is currently using forms authentication. The idea will be that the Android devices will download data from the web service and then be able to work offline storing data in their own local databases, where users will be able to make updates to that data, and then syncing updates back to the main server where possible. The web service will be using HTTPS to prevent calls being intercepted and reduce the risk of calls being intercepted. The system is an industrial system and will not be in used by the general Android population. Instead only authorized Android devices will be authorized by the Web Service to make calls. As such I was thinking of using the Android devices serial number as a username and then a generated long password which the device will be able to pick up - once the device has been authorized server side. The device will also have user logins - but these will not be to log into the web service - just the device itself - since the device and user must be able to work offline. So usernames and passwords will be downloaded and stored on the devices themselves. My question is... what form of security is best setup on the web service? Should it use forms Authentication? Should the username and password just be passed in with each GET/POST call or should it start a session as I have with the website? The Android side causes more confusion. There seems to be a number of options here Spring-Android, Volley, Retrofit, LoopJ, Robo Spice which seems to use the aforementioned Spring, Retrofit or Google HttpClient. I'm struggling to find a simple example which authenticates with a forms based authentication system. Is this because I'm going about this wrong? Is there another option that would better suite this?

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• Strategy for managing lots of pictures for a website

  - by Nate

  I'm starting a new website that will (hopefully) have a lot of user generated pictures. I'm trying to figure out the best way to store and serve these pictures. The CMS I'm using (umbraco) has a media library that puts a folder on the server for each image. Inside of there you can have different sizes of that same image. That folder has an ID on it and the database has additional information for that image along with the ID of the folder. This works great for small sites, but what if the pictures get up to 10,000, 100,000 or 1,000,000? It seems like the lookup on the directory would take a long time to find the correct folder. I'm on windows 2008 if that makes a difference. I'm not so worried about load. I can load balance my server pretty easily and replicate the images across the servers. The nature of the site won't have a lot of users on it either, but it could have a lot of pics. Thanks. -Nate EDIT After some thought I think I'm going to create a directory for each user under a root image folder then have user's pictures under that. I would be pretty stoked if I had even 5,000 users, so that shouldn't be too bad of a linear lookup. If it does get slow I will break it down into folders like /media/a/adam/image123.png. If it ever gets really big I will expand the above method to build a bigger tree. That would take a LOT of content though.

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• Auto update for application hosted on multiple servers on cloud

  - by mots_g

  I'm working on an application which will run on multiple Amazon EC2 instances. I wish to incorporate auto update feature for my application. The updater should update all the Ec2 instances. Also, there is a central server which governs the creation/termination of EC2 instances as per load. The central server creates a EC2 new instance from a pre-configured custom AMI (custom image which has our application pre-installed). Also, once there is an update, the pre-configured AMI needs to be updated too else it would create new instances which are not updated. Should the central server notify all the ec2 instances for an update and then the instances update themselves?Or should the application on Ec2 instance have a check for periodically updating themselves? Also how should the Amazon custom AMI be updated? Should a new instance be created from it, updated and then a new AMI be re-created and then new images be created from this AMI? What is the best way to incorporate an auto update feature for this architecture? The central server is written in Java and the application running on the cloud is written in C++. Is there a good framework available that can be used for this architecture? Please let me know on what I could be missing in the design and how it would help me to have a nice, extensible and fail safe auto update architecture. Thanks

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• How do I host multiple SSL websites on a single EC2 instance using Amazon Elastic Load Balancers?

  - by Developr

  If I have 3 separate websites which all require SSL (separate certificates) that I want to host on the same EC2 instance(s) across multiple availability zones so that we have the ability to scale and be highly available, how do I achieve this using ELBs in my Amazon VPC? Each site requires a separate IP address, so I have added multiple private IPs to the EC2 instance, but I am unsure how to bind the ELB to a certain IP on the instance. I was also able to setup multiple ELB pointing to the same instance, but again, I am not seeing any way to bind each ELB to a separate IP on the instance. If this is not possible, what is the best option? Run each site on a separate EC2 instance / ELB combo (expensive and harder to maintain) Give each site a separate public IP and use Route 53 to do the load balancing (seems like a hack) Use a different load balancer option such as HAProxy that should be able to work like a normal load balancer appliance. Please help!

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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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