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• Approach for developing software that will need to be ported to multiple mobile platforms in the future

  - by Jonathan Henson

  I am currently doing the preliminary design for a new product my company will be pushing out soon. We will start on Android, but then we will need to quickly develop the IPhone, IPad.... and then the Windows 8 ports of the application. Basically the only code that wouldn't be reusable is the view specific code and the multimedia functions. This will be an SIP client (of course the user of the app will not know this) with several bells and whistles for our own business specific purposes. My initial thought is to develop all of the engine in C and provide a nice API for the C library since JAVA and .NET will allow native invoking, and I should just be able to directly link to the C lib in objective-C. Is there a better approach for vast code reuse which also remains close to the native platform? I.e. I don't want dependencies such as Mono-droid and the like or complicated interpreter/translator schemes. I don't mind re-coding the view(s) for each platform, but I do not want to have multiple versions of the main engine. Also, if I want to have some good abstraction mechanisms (like I would in say, C++) is this possible? I have read that C++ is not allowed for the IPad and Iphone devices. I would love to handle the media decoding in the C library, but I assume that this will be platform dependent so that probably will not be an option either. Any ideas here?

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• Random users randomly being unable to connect to my static content domain

  - by jls33fsls

  I store all of my images, js, and css files on a separate domain to try and speed up page load times (it isn't a CDN, just a separate domain on the same server). This works fine for 99% of the users, 99% of the time. However, there are users that randomly are unable to connect to the static content domain for periods of 1-5 hours. They can go to the main site, but no images will load and everything is just white because no css is being loaded. If they go to the static content domain itself, the page just idles for a while and then times out with a blank white page, no error messages. I have no idea what could be causing this, and it hasn't happened to me, any ideas? I am running Apache on CentOS 5.5.

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• Multiple test Active Directory envirovments hand in hand with production domain controllers

  - by MadBoy

  What's the best approach of having multiple test environments next to production one? We have multiple programming teams that build solutions that use Active Directory very often. We have tried different approaches, starting with their own domain controllers (in same subnet), or additional OU's in our production AD that the team gets control over and can create/delete accounts within that one OU. We thought of possible 4 solutions: Setting up separate OU's in ou production env. Creating subdomains for our contoso.com domain like test.contoso.com, something.contoso.com and delegating control to the teams (would we need additional DC's or the two that we have already would be enough to hold this? Setting up additional test domain controler that has a trust to our main domain and all teams can use the test domain controler as they please. Setting up single domain controller for every team/project. We're taking in consideration amount of resources needed, security (for example having multiple domain controlers with multiple passwords may lead users to use simpler passwords) and overall best practices for this scenario.

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• Any algorithm to dedicate a set of known resources to a set of known requirements (scheduling)

  - by Saeed Neamati

  I'm developing an application to help school principals in dedicating teachers to classes and courses over the hours of a week (scheduling). The scenario is roughly something like this: User enters the list of teachers and their free times into the system User enters the list of courses for this semester User enters the list of available classes into the system Well, up to here, there is no big deal. Just simple CRUD operations and nothing extraordinary. However, now what makes this system useful is that the application should automatically and based on an algorithm create the semester scheduling. I think you've got the main idea here. For example application should suggest that teacher A should go to class 1 for mathematics, and at the same time teacher B should go to class 2 for physics. This way all of the classes would be dedicated to lessons and teacher times won't overlap each other. Piece a cake for school principal. However, I can't find a good algorithm for this resource dedication. I mean it seems hard to me. Searching Google resulted in articles from different websites, but they are of no help and use to me. For example: http://en.wikipedia.org/wiki/Resource_allocation or http://en.wikipedia.org/wiki/Scheduling_(production_processes) Is there any algorithm out there, or any application or engine which can help me here? Does this requirements have a known name, like for example time scheduling engine? Any help would be appreciated.

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• Are R&D mini-projects a good activity for interns?

  - by dukeofgaming

  I'm going to be in charge of hiring some interns for our software department soon (automotive infotainment systems) and I'm designing an internship program. The main productive activity "menu" I'm planning for them consists of: Verification testing Writing Unit Tests (automated, with an xUnit-compliant framework [several languages in our projects]) Documenting Code Updating wiki Updating diagrams & design docs Helping with low priority tickets (supervised/mentored) Hunting down & cleaning compiler/run-time warnings Refactoring/cleaning code against our coding standards But I also have this idea that having them do small R&D projects would be good to test their talent and get them to have fun. These mini-projects would be: Experimental implementations & optimizations Proof of concept implementations for new technologies Small papers (~2-5 pages) doing formal research on the previous two points Apps (from a mini-project pool) These kinds of projects would be pre-defined and very concrete, although new ideas from the interns themselves would be very welcome. Even if a project is too big or is abandoned, the idea would also be to lay the ground work so they can be retaken by another intern or intern team. While I think this is good in concept, I don't know if it could be good in practice, as obviously this would diminish their productivity on "real work" (work with immediate value to the company), but I think it could help bring aboard very bright people and get them to want to stay in the future (which, I think, is the end goal for any internship program). My question here is if these activities are too open ended or difficult for the average intern to accomplish and if R&D is an efficient use of an interns time or if it makes more sense for to assign project work to interns instead.

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• Logon Failure: the target account name is incorrect after making a ghost image of a server

  - by cop1152

  I recently replaced a failing SCSI drive in a Windows 2000 server with an IDE drive. I made an image of the SCSI drive and Ghosted it. The purpose of the machine was to give out DHCP at one location and host a couple of files. When I restarted the machine with the new drive, DHCP appears to be working fine, but I cannot get to any of the shares. Instead, I get the following message when attempting to navigate using Explorer. Logon Failure: the target account name is incorrect It appears that this machine is not communicating with the main domain controller. Changes to user accounts (performed on the domain controller) are not replicated on this machine.

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• Windows 8 BIOS - Boot Ubuntu from External HDD

  - by F3AR3DLEGEND

  My laptop came pre-loaded with Windows 8 64-bit (only storage device is a 128 GB SSD). Since it is my school laptop/I've heard creating a Linux partition alongside Windows 8 is not very wise I installed Ubuntu onto my external hard drive. I have a 500GB external HDD with the following partitions: Main Partition - NFTS - ~400 GB Extension Partition / - ext2 - ~25gb /home - ext2 - ~30gb swap - ext2 - 10gb /boot - ? - 10gb ? = not sure of partition Using the PenDriveLinux installer, I created a LiveUSB version of Ubuntu 12.04 (LTS) on a 4GB USB drive. Using that, I installed Ubuntu onto the external hard-drive, without any errors (or at least none that I was notified of). Using the BIOS settings, I changed the OS-loading order so that it is in this order: My External USB HDD Windows Boot Loader Some other things Therefore, Ubuntu should load from my hard drive first, but it doesn't. Also, my hard drive is in working condition, and it turns on when BIOS starts (there is a light indicator). When I start my laptop, it goes directly to Windows 8 (I have the fast startup setting disabled as well). So, is there any way for me to set it up so that when my HDD is connected, it will automatically load Ubuntu? Thanks in advance!

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• VPN doesn't have access to drives unless I use the default gateway

  - by Seb

  I am trying to setup a VPN connection on one of our office servers so that many of our employees can access our drives when out of town or for important business meetings. However I have a weird glitch in where if the default gateway option is checked they can see the drives and files, but get no internet access. If I have the default gateway option unchecked then they have there internet and can successfully connect to the VPN, but they are not able to see any of the drives or files. The server is running Windows Server 2003 Standard while the employees run either XP or 7 Professional. Any help is greatly appreciated. Thank you. EDIT The VPN setup is PPTP and the main server is behind a SonicWall if that is of any importance.

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• Do virtual machines perform better on the host HDD or USB drive?

  - by Jeremy Ricketts

  The question I'm asking is kind of general, and I'll give more specifics about my specific setup. Here's the main question though: Do virtual machines generally perform better on the host HDD or is it better to operate them from an external disk? My specific setup: A Macbook Pro with a nearly full internal SATA drive that spins at 7200. On this system I'm running large programs like Photoshop and some other RAM-intense applications. I've dedicated 2 of my 8 gigs of RAM to my VMware Fusion virtual machine, which runs Windows 7 and Visual Studio, sits on the same drive. When that thing boots up, my system really starts crawling. I have an external USB (specifics of that drive are here) which I'm thinking about moving the VM to. Obviously a USB drive is slower than my internal HDD, but maybe having two operating systems using the same disk is WORSE than putting one of them on a separate (albiet slower) disk. This a bad idea?

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• Why do I get this Debug Assertion Failed? Expression: list iterator not dereferenceable [migrated]

  - by Karel

  I'm trying this example in the (translated to dutch) book of Bjarne Stroustrup (C++): #include <vector> #include <list> #include "complex.h" complex ac[200]; std::vector<complex> vc; std::list<complex> l; template<class In, class Out> void Copy(In from, In too_far, Out to) { while(from != too_far) { *to = *from; ++to; ++from; } } void g(std::vector<complex>& vc , std::list<complex>& lc) { Copy(&ac[0], &ac[200], lc.begin()); // generates debug error Copy(lc.begin(), lc.end(), vc.begin()); // also generates debug error } void f() { ac[0] = complex(10,20); g(vc, l); } int main () { f(); } ** Compiling and Linking goes successful (0 errors/warnings)** But at runtime I get this error: Debug Assertion Failed! Program: path to exe file: \program files\ms vs studio 10.0\vc\include\list Line: 207 Expression: list iterator not dereferenceable For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts. (Press retry to debug the application)

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• 2D SAT Collision Detection not working when using certain polygons (With example)

  - by sFuller

  My SAT algorithm falsely reports that collision is occurring when using certain polygons. I believe this happens when using a polygon that does not contain a right angle. Here is a simple diagram of what is going wrong: Here is the problematic code: std::vector<vec2> axesB = polygonB->GetAxes(); //loop over axes B for(int i = 0; i < axesB.size(); i++) { float minA,minB,maxA,maxB; polygonA->Project(axesB[i],&minA,&maxA); polygonB->Project(axesB[i],&minB,&maxB); float intervalDistance = polygonA->GetIntervalDistance(minA, maxA, minB, maxB); if(intervalDistance >= 0) return false; //Collision not occurring } This function retrieves axes from the polygon: std::vector<vec2> Polygon::GetAxes() { std::vector<vec2> axes; for(int i = 0; i < verts.size(); i++) { vec2 a = verts[i]; vec2 b = verts[(i+1)%verts.size()]; vec2 edge = b-a; axes.push_back(vec2(-edge.y,edge.x).GetNormailzed()); } return axes; } This function returns the normalized vector: vec2 vec2::GetNormailzed() { float mag = sqrt( x*x + y*y ); return *this/mag; } This function projects a polygon onto an axis: void Polygon::Project(vec2* axis, float* min, float* max) { float d = axis->DotProduct(&verts[0]); float _min = d; float _max = d; for(int i = 1; i < verts.size(); i++) { d = axis->DotProduct(&verts[i]); _min = std::min(_min,d); _max = std::max(_max,d); } *min = _min; *max = _max; } This function returns the dot product of the vector with another vector. float vec2::DotProduct(vec2* other) { return (x*other->x + y*other->y); } Could anyone give me a pointer in the right direction to what could be causing this bug? Edit: I forgot this function, which gives me the interval distance: float Polygon::GetIntervalDistance(float minA, float maxA, float minB, float maxB) { float intervalDistance; if (minA < minB) { intervalDistance = minB - maxA; } else { intervalDistance = minA - maxB; } return intervalDistance; //A positive value indicates this axis can be separated. } Edit 2: I have recreated the problem in HTML5/Javascript: Demo

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• How do I recover lost/inacessible data from my storage device?

  - by TomWij

  What steps can I take to try to recover lost or inaccessible data from any storage device? Answers: This applies to any main storage devices; eg. internal/external hard drive, USB stick, Flash memory. The most important thing is to STOP using it, any type of I/O can ruin your chances of a recovery. Click here in case you suspect corruption or bad sectors. Click here in case you suspect mechanical issues.

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• Pull row of data from one place in spreadsheet to another

  - by bookcasey

  I have a list of names and their assorted properties. I am trying to find a way to quickly move an entire row's worth of data into a different sheet so I can manipulate it. Currently I can accomplish this by copy and pasting the entire row, but this is not elegant nor dynamic (the number in blue does not update with this method): My ideal solution: A name is typed into the "Name" column. The spreadsheet program pulls the associated row from the "main" sheet into the new sheet. I am currently using Numbers.app, but am curious if this is possible in Excel, OpenOffice Calc, Google Docs, or any other spreadsheet program. Thank you.

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• data protector red tapes

  - by Caesar

  I am using HP Data Protector A.06.11 in my organization, with HP EML E-SeriesEML library, with 4 drives using LTO-4 tapes, and i am having some problems. Yesterday I put 5 new tapes in the robot and formatted them. At that time, the robot got just those empty 5 tapes with empty space. (all the rest of the tapes are red, or with protection) Today in the morning after the night (1 backup run at night), and 2 of the new tapes are red (the properties are): Writes : 2 Overwrites : 1 Errors : 9 I format one of them, and check for each drive if the tape become red, no one of the drives do it. In the main pool properties, in media condition got: Valid for : 36 (months) Maximum overwrites : 250

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• Which window manager do you use?

  - by Stephan202

  Combining "What is your default web browser?" and "What are the differences between Linux Window Managers", I ask you: which window manager do you use, and why? Myself I prefer a minimal window manager on the one hand (in the past I used Fluxbox), but on the other hand wish to go with the main stream, to ease finding (Googling) solutions in case of problems. Hence I stick with Gnome as it is shipped with Ubuntu. Why do you use the window manager which you use? I understand some reasons may be subjective, but please try to cite technical reasons where possible.

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• Assigning valid moves on board game

  - by Kunal4536

  I am making a board game in unity 4.3 2d similar to checkers. I have added an empty object to all the points where player can move and added a box collider to each empty object.I attached a click to move script to each player token. Now I want to assign valid moves. e.g. as shown in picture... Players can only move on vertex of each square.Player can only move to adjacent vertex.Thus it can only move from red spot to yellow and cannot move to blue spot.There is another condition which is : if there is the token of another player at the yellow spot then the player cannot move to that spot. Instead it will have to go from red to green spot. How can I find the valid moves of the player by scripting. I have another problem with click to move. When I click all the objects move to that position.But I only want to move a single token. So what can i add to script to select a specific object and then click to move the specific object.Here is my script for click to move. var obj:Transform; private var hitPoint : Vector3; private var move: boolean = false; private var startTime:float; var speed = 1; function Update () { if(Input.GetKeyDown(KeyCode.Mouse0)) { var hit : RaycastHit; // no point storing this really var ray = Camera.main.ScreenPointToRay (Input.mousePosition); if (Physics.Raycast (ray, hit, 10000)) { hitPoint = hit.point; move = true; startTime = Time.time; } } if(move) { obj.position = Vector3.Lerp(obj.position, hitPoint, Time.deltaTime * speed); if(obj.position == hitPoint) { move = false; } } }`

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• OpenGL ES 2 jittery camera movement

  - by user16547

  First of all, I am aware that there's no camera in OpenGL (ES 2), but from my understanding proper manipulation of the projection matrix can simulate the concept of a camera. What I'm trying to do is make my camera follow my character. My game is 2D, btw. I think the principle is the following (take Super Mario Bros or Doodle Jump as reference - actually I'm trying to replicate the mechanics of the latter): when the caracter goes beyond the center of the screen (in the positive axis/direction), update the camera to be centred on the character. Else keep the camera still. I did accomplish that, however the camera movement is noticeably jittery and I ran out of ideas how to make it smoother. First of all, my game loop (following this article): private int TICKS_PER_SECOND = 30; private int SKIP_TICKS = 1000 / TICKS_PER_SECOND; private int MAX_FRAMESKIP = 5; @Override public void run() { loops = 0; if(firstLoop) { nextGameTick = SystemClock.elapsedRealtime(); firstLoop = false; } while(SystemClock.elapsedRealtime() > nextGameTick && loops < MAX_FRAMESKIP) { step(); nextGameTick += SKIP_TICKS; loops++; } interpolation = ( SystemClock.elapsedRealtime() + SKIP_TICKS - nextGameTick ) / (float)SKIP_TICKS; draw(); } And the following code deals with moving the camera. I was unsure whether to place it in step() or draw(), but it doesn't make a difference to my problem at the moment, as I tried both and neither seemed to fix it. center just represents the y coordinate of the centre of the screen at any time. Initially it is 0. The camera object is my own custom "camera" which basically is a class that just manipulates the view and projection matrices. if(character.getVerticalSpeed() >= 0) { //only update camera if going up float[] projectionMatrix = camera.getProjectionMatrix(); if( character.getY() > center) { center += character.getVerticalSpeed(); cameraBottom = center + camera.getBottom(); cameraTop = center + camera.getTop(); Matrix.orthoM(projectionMatrix, 0, camera.getLeft(), camera.getRight(), center + camera.getBottom(), center + camera.getTop(), camera.getNear(), camera.getFar()); } } Any thought about what I should try or what I am doing wrong? Update 1: I think I updated every value you can see on screen to check whether the jittery movement is affected by that, but nothing changed, so something must be fundamentally flawed with my approach/calculations.

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• How to handle new domain names?

  - by michael

  I have a new product which I'll call a pen ink reloader. I have a website using my products name, for example, www.inkywink.com which I want to have accessed by searches for keywords such as "pen ink", "pen out of ink" "ink for pens" etc. , since nobody knows that a pen ink reloader exists. I see that its quite difficult to get on front page for these keywords since they have lots of competition. However I notice that the exact phrases I want to rank highly for are available as domains. I purchase "www.penink.com" and "penoutofink.com" which for arguments sake are highly searched and the perfect keywords to get eyes on my money site www.inkywink.com . Two questions: 1. What is my best option to leverage those names so that they appear near top of searches so that I can get traffic to my money site? Do I just have them redirect 301 to inkywink.com or should I create small original content on each with links to my main site? 2. If I just have them redirected to inkywink.com, am I able to use keywords in metatag and headers for each site separately or do they all automatically obtain the same headers and tags as the site to which theyre redirected ? Thanks to anyone who can help as I'm a real newbie to all this.

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• "Viral" license that only blocks legal actions of user and developer against each other

  - by Lukasz Zaroda

  I was thinking a lot about software licensing lately, because I would like to do some coding. I'm not an expert in all those licenses, so I came up with my own idea, and before I will put in on paper, I would like to make sure that I didn't reinvent a wheel, so maybe I would be able to use something that exists. Main idea behind my license is to guarantee freedom of use the software, but not "freedom to" (positive) (e.g. freedom to having source code), but "freedom from" (negative) (strictly from legal actions against you). It would be "viral" copyleft license. You would be able to without fear do everything you want with the software (and binaries e.g. reverse engineering), as long as You will include information about author and/or authors, and all derivative works will be distributed with the same license. I'm not interested in anything that would restrict a freedom of company to do something like "tivoization". I'm just trying to accomplish something that would block any legal actions of user and developer, targeted against each other, with the exception of basic attribution. Does exist something like that?

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• State Design Pattern .NET Code Sample

  using System;using System.Collections.Generic;using System.Linq;using System.Text;class Program{ static void Main(string[] args) { Person p1 = new Person("P1"); Person p2 = new Person("P2"); p1.EatFood(); p2.EatFood(); p1.Vomit(); p2.Vomit(); }}interface StomachState{ void Eat(Person p); void Vomit(Person p);}class StomachFull : StomachState{ public void Eat(Person p) { Console.WriteLine("Can't eat more."); } public void Vomit(Person p) { Console.WriteLine("I've just Vomited."); p.StomachState = new StomachEmpty(); }}class StomachEmpty : StomachState{ public void Eat(Person p) { Console.WriteLine("I've just had food."); p.StomachState = new StomachFull(); } public void Vomit(Person p) { Console.WriteLine("Nothing to Vomit."); }}class Person{ private StomachState stomachState; private String personName; public Person(String personName) { this.personName = personName; StomachState = new StomachEmpty(); } public StomachState StomachState { get { return stomachState; } set { stomachState = value; Console.WriteLine(personName + " Stomach State Changed to " + StomachState.GetType().Name); Console.WriteLine("***********************************************\n"); } } public Person(StomachState StomachState) { this.StomachState = StomachState; } public void EatFood() { StomachState.Eat(this); } public void Vomit() { StomachState.Vomit(this); }} span.fullpost {display:none;}

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• Conflict resolution for two-way sync

  - by K.Steff

  How do you manage two-way synchronization between a 'main' database server and many 'secondary' servers, in particular conflict resolution, assuming a connection is not always available? For example, I have an mobile app that uses CoreData as the 'database' on the iOS and I'd like to allow users to edit the contents without Internet connection. In the same time, this information is available on a website the devices will connect to. What do I do if/when the data on the two DB servers is in conflict? (I refer to CoreData as a DB server, though I am aware it is something slightly different.) Are there any general strategies for dealing with this sort of issue? These are the options I can think of: 1. Always use the client-side data as higher-priority 2. Same for server-side 3. Try to resolve conflicts by marking each field's edit timestamp and taking the latest edit Though I'm certain the 3rd option will open room for some devastating data corruption. I'm aware that the CAP theorem concerns this, but I only want eventual consistency, so it doesn't rule it out completely, right? Related question: Best practice patterns for two-way data synchronization. The second answer to this question says it probably can't be done.

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• Server 2012 Storage Pools, Raid Controller... can the Storage Pool deal with it?

  - by TomTom

  Before trying it out - I don't find any documentation. Given that Storage Pools have serious performance problems with parity, and do not rebalance data at the moment when you add discs, my preferred way to use them would be as think provisioned space, ISCSI targets - with every "Pool" running against 1 RAID that comes from a Raid controller (who also introduces SSD read and write caching - another thing missing from Storage Pools). The main question is - how does a Storage Pool handle the change in the underlying disc that can happen? I mostly talk about OCE (Online Capacity Expansion), where a disc after an expansion suddenly reports a larger space. Standard Windows allows you to use this additional space (and expand the partitions). How does a storage pool handle it?

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• Two mail servers, need help with dns configuration for the backup one

  - by user92231

  I need to run a redundant backup mail server in case the main one goes down. The settings in GoDaddy look something like the following: A (Host) Host Points to @ ip address of mail1 41.x.x.x mail1 ip address of mail1 41.x.x.x mail2 ip address of mail2 196.x.x.x MX Priority host points to 10 @ mail1.mydomain.com 20 @ mail2.mydomain.com When mail1 goes down, mail2 is able to get emails. I can access it through the browser with no problem, but I want my users to able to pop3/smtp as well without changing anything in their outlook. I dont want any impact to the users when mail1 is down. Also, I'm using the windows server DFS to keep both folders of the mails in sync. Is this the right way, or should I be using something else?

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• Choosing open source vs. proprietary CMS

  - by jkneip

  Hi- I've been tasked with redesigning a website for a small academic library. While only in charge of the site for 6 months, we've been maintaining static html pages edited in Dreamweaver for years. Last count of our total pages is around 400. Our university is going with an enterprise level solution called Sitefinity, although we maintain our own domain and are responsible to maintain our own presense. Some background-my library has a couple Microsoft IIS servers on which this static html site has been running. I'm advocating for the implementation of a CMS while doing this redesign. The problem is I'm basically the lone webmaster so I have no one to agree or disagree with my choice. There are also only 1-2 content editors right know for the site but a CMS could change that factor. I would like to use the functionality of having servers that run .NET and MS SQL but am more experience setting up and maintaining open source software like Wordpress or Drupal on web hosts. My main concern is choosing a CMS that will be easy to update / maintain / deal with upgrades (i.e., support) in case I'm not there in the future. So I'm wondering how to factor in the open source CMS vs. a relatively inexpensive commercial CMS decision and whether choosing PHP/MySQL vs. ASP.net framework for development environment will play into my decision. Thanks for any input that can be offered based on the details I've given. Thanks, Jason

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• apt-get issue after upgrading to 12.04

  - by user83906

  I have recently upgraded my cluster from 11.10 to 12.04. After the upgrade, I am having trouble running apt-get on the cluster nodes. I can ssh between the nodes (client-to-client; client-to-head; client-to-external etc.). However, sudo apt-get update produces the following errors: Ign http://us.archive.ubuntu.com precise InRelease Ign http://security.ubuntu.com precise-security InRelease Ign http://www.openfoam.org maverick InRelease Ign http://us.archive.ubuntu.com precise-updates InRelease Err http://security.ubuntu.com precise-security Release.gpg Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname) Err http://www.openfoam.org maverick Release.gpg Something wicked happened resolving 'www.openfoam.org:http' (-5 - No address associated with hostname) Ign http://us.archive.ubuntu.com precise-backports InRelease Ign http://www.openfoam.org maverick Release Ign http://security.ubuntu.com precise-security Release Err http://us.archive.ubuntu.com precise Release.gpg Something wicked happened resolving 'us.archive.ubuntu.com:http' (-5 - No address associated with hostname) Ign http://security.ubuntu.com precise-security/main Sources/DiffIndex Err http://us.archive.ubuntu.com precise-updates Release.gpg Something wicked happened resolving 'us.archive.ubuntu.com:http' (-5 - No address associated with hostname) Ign http://security.ubuntu.com precise-security/restricted Sources/DiffIndex 15% [Connecting to us.archive.ubuntu.com] [Connecting to security.ubuntu.com] [Connecting to www.openfoam.org] On the headnode, I have in /etc/network/iterfaces: auto eth0 iface eth0 inet static address 192.168.0.1/24 On the client nodes, I have /etc/network/iterfaces: auto eth0 iface eth0 inet static address 192.168.0.101 netmask 255.255.255.0 gateway 192.168.0.1 Please advise.

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