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pdating modules on VPS [closed]

- by tertle

Been trying to install openVPN on a VPS but come into a few problems when trying to start the openvpn server. Service deferred error: IPTablesServiceBase: failed to run iptables-restore [status=1]: ['FATAL: Could not load /lib/modules/2.6.18-028stab070.14/modules.dep: No such file or directory', 'FATAL: Could not load /lib/modules/2.6.18-028stab070.14/modules.dep: No such file or directory', 'iptables-restore: line 46 failed']: internet/base:1175,internet/base:752,internet/process:45,internet/process:306,internet/_baseprocess:48,internet/process:775,internet/_baseprocess:60,svc/pp:116,svc/svcnotify:26,internet/defer:238,internet/defer:307,internet/defer:323,sagent/ipts:105,sagent/ipts:39,util/error:52,util/error:32 service failed to start due to unresolved dependencies: set(['user', 'iptables_openvpn']) service failed to start due to unresolved dependencies: set(['user', 'iptables_openvpn']) service failed to start due to unresolved dependencies: set(['iptables_openvpn']) Anyway so after a bit of playing around and some advice, I found that the linux kernal and modules don't match on my server. uname -r returns: 2.6.18-028stab070.14 and ls /lib/modules returns: 2.6.18-028stab070.7 The server is running OpenVZ and my container uses ubuntu 9.10. So my question is, is it possible for me to update my modules on a VPS and if so how would I do this, or is this something I'll need to try get my host to do? Thanks in advance.

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SSH access from outside to a pc inside network

- by Raja

I have a static IP and ADSL router linked to a linksys wireless router to which all my machines are connected. I would want to setup SVN on one of machines and provide SSH access which should be accessible by users outside my network. Would this be possible? Even just SVN access through web should be fine. Please let me know what all things should be done to achieve this ? I have Ubuntu VM running in a iMac Leopard machine and another 2 Win 7 32/64 bit machines. I can setup standalone Ubuntu or Win XP on another machine. Thanks, Raja.

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UML Diagrams of Multi-Threaded Applications

- by PersonalNexus

For single-threaded applications I like to use class diagrams to get an overview of the architecture of that application. This type of diagram, however, hasn’t been very helpful when trying to understand heavily multi-threaded/concurrent applications, for instance because different instances of a class "live" on different threads (meaning accessing an instance is save only from the one thread it lives on). Consequently, associations between classes don’t necessarily mean that I can call methods on those objects, but instead I have to make that call on the target object's thread. Most literature I have dug up on the topic such as Designing Concurrent, Distributed, and Real-Time Applications with UML by Hassan Gomaa had some nice ideas, such as drawing thread boundaries into object diagrams, but overall seemed a bit too academic and wordy to be really useful. I don’t want to use these diagrams as a high-level view of the problem domain, but rather as a detailed description of my classes/objects, their interactions and the limitations due to thread-boundaries I mentioned above. I would therefore like to know: What types of diagrams have you found to be most helpful in understanding multi-threaded applications? Are there any extensions to classic UML that take into account the peculiarities of multi-threaded applications, e.g. through annotations illustrating that some objects might live in a certain thread while others have no thread-affinity; some fields of an object may be read from any thread, but written to only from one; some methods are synchronous and return a result while others are asynchronous that get requests queued up and return results for instance via a callback on a different thread.

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need to run command against multiple lines in file that start with ica-tcp

- by Nick Parsells

I want to run a command on each line of a file I have, however its a bit more complicated then I originally thought. The file contents look like this typically; however there are sometimes more connections: SESSIONNAME USERNAME ID STATE TYPE DEVICE services 0 Disc console 1 Conn t-rpal 48 Disc ica-tcp#0 bpofiretest 50 Active wdica rdp-tcp#2 a-nparsells 51 Active rdpwd ica-tcp 65536 Listen rdp-tcp 65537 Listen The command I want to run is reset session ica-tcp#0. I also want to run the same command on any additional connections that start with ica-tcp that the scripts finds in the file. How can I write a script like that in powershell? thanks!

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Shibboleth + IIS and Pound Reverse Proxy

- by boburob

Having a bit of a problem getting Shibboleth (SSO) working with ADFS and Pound. The main problem seems to be that: The website address will be https://website.domain.com Pound will then terminate the SSL and forward the traffic to the webserver on a different port (http://server.domain.com:8888) I have set up Shibboleth to protect the address http://server.domain.com:8888, which allows me to retrieve metadata and it all seems to be working fine. However the problem seems to be that ADFS is configured to protect the https website, so when Shibboleth attempts to recieve information from ADFS I get nothing except the following error: A token request was received for a relying party identified by the key 'https://msstagrevproxy.cwpintranet.com/shibboleth', but the request could not be fulfilled because the key does not identify any known relying party trust. Key: https://msstagrevproxy.cwpintranet.com/shibboleth I am not really sure how I can work around this as to retrieve the metadata from Shibboleth I have to use the https address but this does not actually exist in Shibboleth or IIS. Has anyone had any experience with this before or using any other SSO with a reverse proxy that works?

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Deleting a row from self-referencing table

- by Jake Rutherford

Came across this the other day and thought “this would be a great interview question!” I’d created a table with a self-referencing foreign key. The application was calling a stored procedure I’d created to delete a row which caused but of course…a foreign key exception. You may say “why not just use a the cascade delete option?” Good question, easy answer. With a typical foreign key relationship between different tables which would work. However, even SQL Server cannot do a cascade delete of a row on a table with self-referencing foreign key. So, what do you do?…… In my case I re-wrote the stored procedure to take advantage of recursion: -- recursively deletes a Foo ALTER PROCEDURE [dbo].[usp_DeleteFoo] @ID int ,@Debug bit = 0 AS SET NOCOUNT ON; BEGIN TRANSACTION BEGIN TRY DECLARE @ChildFoos TABLE ( ID int ) DECLARE @ChildFooID int INSERT INTO @ChildFoos SELECT ID FROM Foo WHERE ParentFooID = @ID WHILE EXISTS (SELECT ID FROM @ChildFoos) BEGIN SELECT TOP 1 @ChildFooID = ID FROM @ChildFoos DELETE FROM @ChildFoos WHERE ID = @ChildFooID EXEC usp_DeleteFoo @ChildFooID END DELETE FROM dbo.[Foo] WHERE [ID] = @ID IF @Debug = 1 PRINT 'DEBUG:usp_DeleteFoo, deleted - ID: ' + CONVERT(VARCHAR, @ID) COMMIT TRANSACTION END TRY BEGIN CATCH ROLLBACK TRANSACTION DECLARE @ErrorMessage VARCHAR(4000), @ErrorSeverity INT, @ErrorState INT SELECT @ErrorMessage = ERROR_MESSAGE(), @ErrorSeverity = ERROR_SEVERITY(), @ErrorState = ERROR_STATE() IF @ErrorState <= 0 SET @ErrorState = 1 INSERT INTO ErrorLog(ErrorNumber,ErrorSeverity,ErrorState,ErrorProcedure,ErrorLine,ErrorMessage) VALUES(ERROR_NUMBER(), @ErrorSeverity, @ErrorState, ERROR_PROCEDURE(), ERROR_LINE(), @ErrorMessage) RAISERROR (@ErrorMessage, @ErrorSeverity, @ErrorState) END CATCH This procedure will first determine any rows which have the row we wish to delete as it’s parent. It then simply iterates each child row calling the procedure recursively in order to delete all ancestors before eventually deleting the row we wish to delete.

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How does operating system software maintains time clocks?

- by Neeraj

Hi everyone, This may sound a bit less relevant but I couldn't think of a better place to ask this question. Now consider this situation, you install an OS on your system, set the timezone and time, do some stuff and turn it off. (Note that there is no power going in to the computer). Now next time (say after some hours or days) you turn it on again, and you see the updated time. How is this possible even when my computer is not connected to the internet and was consuming no power during the period it was down.(Is there some kind of hardware hack?) please clarify!

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Restful WebAPI VS Regular Controllers

- by Rohan Büchner

I'm doing some R&D on what seems like a very confusing topic, I've also read quite a few of the other SO questions, but I feel my question might be unique enough to warrant me asking. We've never developed an app using pure WebAPI. We're trying to write a SPA style app, where the back end is fully decoupled from the front end code Assuming our service does not know anything about who is accessing/consuming it: WebAPI seems like the logical route to serve data, as opposed to using the standard MVC controllers, and serving our data via an action result and converting it to JSON. This to me at least seems like an MC design... which seems odd, and not what MVC was meant for. (look mom... no view) What would be considered normal convention in terms of performing action(y) calls? My sense is that my understanding of WebAPI is incorrect. The way I perceive WebAPI, is that its meant to be used in a CRUD sense, but what if I want to do something like: "InitialiseMonthEndPayment".... Would I need to create a WebAPI controller, called InitialiseMonthEndPaymentController, and then perform a POST... Seems a bit weird, as opposed to a MVC controller where i can just add a new action on the MonthEnd controller called InitialisePayment. Or does this require a mindset shift in terms of design? Any further links on this topic will be really useful, as my fear is we implement something that might be weird an could turn into a coding/maintenance concern later on?

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How to block own rpcap traffic where tshark is running?

- by Pankaj Goyal

Platform :- Fedora 13 32-bit machine RemoteMachine$ ./rpcapd -n ClientMachine$ tshark -w "filename" -i "any interface name" As soon as capture starts without any capture filter, thousands of packets get captured. Rpcapd binds to 2002 port by default and while establishing the connection it sends a randomly chosen port number to the client for further communication. Both client and server machines exchange tcp packets through randomly chosen ports. So, I cannot even specify the capture filter to block this rpcap related tcp traffic. Wireshark & tshark for Windows have an option "Do not capture own Rpcap Traffic" in Remote Settings in Edit Interface Dialog box. But there is no such option in tshark for linux. It will be also better if anyone can tell me how wireshark blocks rpcap traffic....

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Suggestions for wireless adapter

- by Michael Kniskern

I recently purchased a desktop computer and it did not come with a wireless network card. I am currently using the Belkin Wireless G USB Adapter and it is a very sub par product. It has very slow response times and download speeds with just basic browsing and downloads podcasts through iTunes. Does anyone have a better suggestion for a wireless adapter? Should I go with another USB adapter or one that connects directly into the motherboard? I am current using Windows Vista 64 bit Home Premium.

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Oracle Kicks Summer off Right with Our FY14 Global Partner Kickoff

- by Kristin Rose

Are you ready to see what Oracle has in store for FY14? How about hearing from top Oracle Executives like Mark Hurd and Thomas Kurian, as they explain how you can make more money with Oracle? Are you reading this blog? If you answered yes to any of the above questions and want to find out how Oracle’s strategy for the next fiscal year will affect your business, don’t miss Oracle’s FY14 Global Partner Kickoff event taking place Tuesday, June 25th at 9:00AM PT. Kick start your summer by participating in this live Oracle PartnerNetwork event! Here is how you can: 1. Send questions during the live event via Twitter using @oraclepartners and #OPN in your tweets! 2. Take part in our exciting FY14 Partner Kickoff Twitter contest and get entered to win a FREE OPN Exchange pass! Do this by tweeting @oraclepartners a creative picture of your team watching the LIVE event. The winner will be selected at the end of the show! 3. Finally, help us spread the word to the Twitter community using this tweet: “Can’t wait for #Oracle’s Global FY14 Partner Kickoff tomorrow 6/25 at 9AM PT! Join the #OPN conversation! http://bit.ly/12goIPR” You can join the live event by visiting the OPN homepage or OPN's Facebook page the day of the event. Red Stack. Red team. Engineered for Growth! The OPN Communications Team

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If statement causing xna sprites to draw frame by frame

- by user1489599

I’m a bit new to XNA but I wanted to write a simple program that would fire a cannon ball from a cannon at a 45 degree angle. It works fine outside of my keyboard i/o if statement, but when I encapsulate the code around an if statement checking to see if the user hits the space bar, the sprite will draw one frame at a time every time the space bar is hit. This is the code in question if (currentKeyboardState.IsKeyUp(Keys.Space) && previousKeyboardState.IsKeyDown(Keys.Space) && !skullBall.Alive) { //works outside the keyboard input if statement //{ skullBall.Position = cannon.Position; skullBall.DeltaY = -(float)(Math.Sin(MathHelper.ToRadians(45)) * 50/*39.7577*/ * time + 0.5 * (gravity * (time * time))); skullBall.DeltaX = (float)(Math.Cos(MathHelper.ToRadians(45)) * 50/*39.7577*/ * time); skullBall.Alive = true; //} } The skull ball represents the cannon ball and the cannon is just the starting point. DeltaX and DeltaY are the values I’m using to update the cannon balls position per update. I know it's dumb to have the cannon ball start at the cannons position every time the update is called but it’s not really noticeable right now. I was wondering if after examining my code, if anyone noticed any errors that would cause the sprite to display frame by frame instead of drawing it as a full animation of the cannon ball leaving the cannon and moving from there.

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Firefox Not responding - Windows 7

- by Paul

Have just upgraded from Vista to Win7 (32 bit). On vista Firefox worked great. I am using 3.5.6 version. 2GB RAM. In windows 7 however whenever i click on a link, field or tab within the browser or various other places within firefox 'Not Responding' flashes on the title bar. Most of the time i have to click 2 or 3 times to get any link or whatever to work which is very annoying. Any ideas? Can't find anything obvious on google but notice other people get Not Responding messages a lot with various apps. Chrome Plus seems to be fine.

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How to install rgdal on Ubuntu 12.10?

- by radek

I'm strugling to install rgdal library on Ubuntu 12.10. Installation from within R results in error: Error: gdal-config not found The gdal-config script distributed with GDAL could not be found. If you have not installed the GDAL libraries, you can download the source from http://www.gdal.org/ If you have installed the GDAL libraries, then make sure that gdal-config is in your path. Try typing gdal-config at a shell prompt and see if it runs. If not, use: --configure-args='--with-gdal-config=/usr/local/bin/gdal-config' with appropriate values for your installation. ERROR: configuration failed for package ‘rgdal’ * removing ‘/home/rdk/R/x86_64-pc-linux-gnu-library/2.15/rgdal’ Warning in install.packages : installation of package ‘rgdal’ had non-zero exit status R-sig-Geo, this two SE questions and other websites pointed me to the requirements of libgdal1-dev. But when I tried sudo apt-get install libgdal1-dev I end up with another error message Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: libgdal1-dev : Depends: libgdal-dev but it is not going to be installed E: Unable to correct problems, you have held broken packages. Again - when I try to install libgdal-dev another dependencies error shows up The following packages have unmet dependencies: libgdal-dev : Depends: libgeos-dev but it is not going to be installed Depends: libspatialite-dev but it is not going to be installed Again trying libgeos-dev gives message: Depends: libgeos-c1 (= 3.3.3-1.1) but 3.3.3-2~precise2 is to be installed E: Unable to correct problems, you have held broken packages. and libspatialite-dev: Depends: libspatialite3 (= 3.1.0~rc2-1ubuntu1) but 3.1.0~rc2-2~precise1 is to be installed Is there any way to tame those dependencies and have rgdal running in Ubuntu? My sessionInfo() R version 2.15.1 (2012-06-22) Platform: x86_64-pc-linux-gnu (64-bit)

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Huge procedurally generated 'wilderness' worlds

- by The Communist Duck

I'm sure you all know of games like Dwarf Fortress - massive, procedural generated wilderness and land. Something like this, taken from this very useful article. However, I was wondering how I could apply this to a much larger scale; the scale of Minecraft comes to mind (isn't that something like 8x the size of the Earth's surface?). Pseudo-infinite, I think the best term would be. The article talks about fractal perlin noise. I am no way an expert on it, but I get the general idea (it's some kind of randomly generated noise which is semi-coherent, so not just random pixel values). I could just define regions X by X in size, add some region loading type stuff, and have one bit of noise generating a region. But this would result in just huge amounts of islands. On the other extreme, I don't think I can really generate a supermassive sheet of perlin noise. And it would just be one big island, I think. I am pretty sure Perlin noise, or some noise, would be the answer in some way. I mean, the map is really nice looking. And you could replace the ascii with tiles, and get something very nice looking. Anyone have any ideas? Thanks. :D

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Installing Domain Controller on Hyper-V Host

- by MichaelGG

Given a resource limited setup consisting of 2 host machines (HyperV-01 and HyperV-02), is it OK to put the domain controllers in parent partition, instead of their own VM? The main reason is that if the DCs go into a child partition, starting from cold on both machines could lead to a bit of an issue, as there'd be no DCs around until well after both parents have booted. I'm guessing this might cause undesirable effects. Am I correct to be worried about joining the host systems to a domain that's only on VMs? The biggest drawback I've heard so far is that if AD gets heavily used, its resources could cut into HyperV's. I'm not concerned about that for this deployment. Any other suggestions? (Besides finding a 3rd machine and running AD on it.)

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Public Facing Recursive DNS Servers - iptables rules

- by David Schwartz

We run public-facing recursive DNS servers on Linux machines. We've been used for DNS amplification attacks. Are there any recommended iptables rules that would help mitigate these attacks? The obvious solution is just to limit outbound DNS packets to a certain traffic level. But I was hoping to find something a little bit more clever so that an attack just blocks off traffic to the victim IP address. I've searched for advice and suggestions, but they all seem to be "don't run public-facing recursive name servers". Unfortunately, we are backed into a situation where things that are not easy to change will break if we don't do so, and this is due to decisions made more than a decade ago before these attacks were an issue.

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Collision Detection for a 2D RPG

- by PHMitrious

First of all, I have done some research on this topic before asking, and I'm asking this question as a mean to get some opinions on this topic, so I don't make a decision only on my own, but taking into account other people's experience as well. I'm starting a 2D online RPG project. I am using SFML for graphics and input and I'm creating a basic game structure and all for the game, creating modules for each part of the game. Well, let me get to the point I just wanted to give you guys some context. I want to decide on how I'm going to work with collision detection. Well I'm kinda going to work on maps with a tile map divided in layers (as usual) and add an extra 2 layers - not exactly in the map - for objects. So I'll have collisions between objects and agents (players - npcs - monsters - spells etc) and agents and tiles. The seconds one can be easily solved the first one need a little bit of work. I considered both creating a basic collision test engine using polygons and a quadtree to diminish tests since I'm going to be working with big maps with lots of objects - creating both a physical and graphical world representation. And I also considered using a physics engine like Box2D for collision tests. I think the first approach would take more work on my part but the second one would have the overhead of using a whole physics engine for just collision detection and no physics. What do you guys think ?

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Failure to Boot 12.04 on HP AMD Dual Core. Rescue Mode doesn't even come up

- by L R Bellmore Jr

I have 12.04 installed on HP 64 bit dual core AMD laptop.. worked great until about 1-2 months ago.. now takes 1/2 hour to 25 hours to boot if it ever does. A minor number of times I get the HP logo with hash lines on screen and it just hangs... When it finally boots 95% it will run until I turn it off days later to see if any of the upgrades fixed the problem. Currently, if it boots, it is random.. .left on over night .. 2 nights ago and came back to a HP logo with Hash Lines horizontal across the screen.. frozen.. rebooted back to black screen.. no HP logo... Most often when it does boot.. no HP logo.. just cursor shows up.. and then I know it will finally load... computer has been made worthless and it is my work computer..HELP PLEASE... Rescue Mode can't be invoked.. computer doesnt respond.. has shown up 3 times in about 100 and when I have tried it... 1 time it resulted in a boot up but then failed in a couple hours.

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File doesn't exist in Linux although it's located in Terminal

- by Mazen Ayman

I'm a bit new to unix/linux environment, but I have a small problem. I'm using "locate" to find the path of a file I need, it gives me the path for it, but the file doesn't exist in that path, like that: locate test1.txt /home/user/test files/text1.txt /home/user/test1.txt~ "test files" directory is where I was keeping the file and I copied it to the home directory once but I deleted it, no idea what it keeps telling me there is still a tmp file for it. it worth mentioning that I used the command: locate test1.txt~ |xargs -n1 rm to remove that tmp file, but maybe that what caused the problem. I tried to show hidden files, and check for temp files, didn't find it either. any clue what happened?

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Drivers for Ubuntu 13.10 [on hold]

- by Fernando De Souza Martins

I just installed Ubuntu 13.10, my screen resolution is not fitting my screen as the ubuntu interface is all around stretching over the screen, so i thought i might install nvidia's driver that i know can let me adjust the exact resolution i need. So i began a 2 hour quest, i downloaded the driver hoping i would have a wizard to instal it, but yeah, so i tried to do a bit of research and i found that feature, i think its called in english additional drivers, but it wont show the nvidia drivers, i tried the terminal, but once i write the commands i found it asks for a password but i cant type anything once the password is asked. So, my question, obviously, how do i install this driver? I am not sure if this is appropriate, but why doesnt ubuntu have a wizard to install things? I feel like im working for the OS, when it should be the other way around, but i love the concept of linux, so im pushing forward and trying to use it. Another thing is, i had to install a bunch of drivers and applications for the drivers in windows, do i need to install any other driver? I cant change my mouse's sensibility in the os, it seems, so how do i do it? I'm sorry i'm asking all of this, but it seems necessary.

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How do you name/brand software?

- by JasCav

I am working on an application that is brand new. We have been using an internal name up to this point, but it's not very imaginative and is definitely not good from a branding standpoint. I have been tasked to come up with a name for the software. I am really struggling with this as every name I have thought about really doesn't seem to do the software justice. I have tried acronyms, mythology names, scientific names, etc. I may be being a bit picky, but I feel like the name should just hit me when its right. Here are my requirements: The name has to be easy to say (and hopefully catchy). The name has to relate back to what the software does. The name has to be able to be branded. (For example, vivid imagery, tagline, etc.) So, although I can't give the specifics of the software, I was hoping the brains here could provide some insight as to how I should go about naming/branding a piece of software?

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How to increase the disk cache of Windows 7

- by Mark Christiaens

Under Windows 7 (64 bit), I'm reading through 9000 moderately sized files. In total, there is more than 200 MB of data. Using Java (JDK 1.6.21) I'm iterating over the files. The first 1400 or so go at full speed but then speed drops off to 4ms per file. It turns out that the main cost is incurred simply by opening the files. I'm opening the files using new FileInputStream (and of course closing them in time to avoid file leaks). After some investigating, I see that Windows' disk cache is using only 100 MB or so of RAM although I have 8 GiB available. I've tried increasing the cache size using the CacheSet tool but any values I provide are considered out of range. I've also tried enabling the LargeSystemCache registry key but (after rebooting) the CacheSet tool still indicates I'm using 100 MB of cache (and doesn't increase during the test run). Does anybody have any suggestions to "encourage" Windows 7 to cache my 9000 files?

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IIS's SMTP Pickup timing

- by fatcat1111

I have IIS's SMTP server set up as a closed relay, and it's working nicely. I also have an application that writes EML files. If the EML files are written to a temporary directory, then moved to the server's Pickup directory, email is sent as expected. However, if I have the application write the EML files directly to the Pickup directory, the email will often fail to send. This seems to be a race condition: the server starts processing the EML file as soon as it detects it in Pickup, even though the application hasn't completed writing it. The result is the server considers the EML to be malformed, and it punts it to Badmail. While I very much appreciate the server's earnestness, it seems that I need to dial it back a bit for this scenario. Does anybody know if IIS's SMTP server's polling frequency can be configured? I am using IIS7, Windows Server 2008 R2. The application that writes the EML cannot be modified.

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How to search for a Windows 8 folder by name

- by Edward Brey

In Windows 7, if you press the Windows key and type the name of a folder, and the folder shows up among the Start menu search results. In Windows 8, if you do the same thing, no folders are listed. The Files filter shows files with matching names, but no folders. I realize that you can still search for folders from the Windows Explorer search box, but navigating that way is a bit slow and clumsy. Is there a quicker way, in particular a way to search directly from the Windows 8 Start screen?

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