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• mongrel not working - Ruby on Rails

  - by Steven

  I have deployed my rails app to a live server(linux) and I have successfully installed the the mongrel gems, and I can successfully start the server for my app but when i try to acceess the website on the server i get the error The server at 196.xx.xxx.xx is taking too long to respond. Is there anything i need to do to be able to access my app on the browser? Mongrel Logs ** Starting Rails with production environment... ** Rails loaded. ** Loading any Rails specific GemPlugins ** Signals ready. TERM = stop. USR2 = restart. INT = stop (no restart). ** Rails signals registered. HUP = reload (without restart). It might not work well. ** Mongrel 1.1.5 available at 0.0.0.0:3001 ** Writing PID file to /home/xxxxxxx.co.za/shared/log/mongrel.pid

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• Maintaining Logging and/or stdout/stderr in Python Daemon

  - by dave mankoff

  Every recipe that I've found for creating a daemon process in Python involves forking twice (for Unix) and then closing all open file descriptors. (See http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/ for an example). This is all simple enough but I seem to have an issue. On the production machine that I am setting up, my daemon is aborting - silently since all open file descriptors were closed. I am having a tricky time debugging the issue currently and am wondering what the proper way to catch and log these errors are. What is the right way to setup logging such that it continues to work after daemonizing? Do I just call logging.basicConfig() a second time after daemonizing? What's the right way to capture stdout and stderr? I am fuzzy on the details of why all the files are closed. Ideally, my main code could just call daemon_start(pid_file) and logging would continue to work.

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• How to implement nested SQL transactions with ADO.NET?

  - by manza_jurjur

  I need to implement nested transactions in .NET using ADO.NET. The situation is as follows: --> Start Process (Begin Transaction) --> Begin Transaction for step 1 --> Step 1 --> Commit transaction for step 1 --> Begin transaction for step 2 --> Step 2 --> Rollback transaction for step 2 --> etc ... --> End Process (Commit or Rollback ALL commited steps) Can that be done with transaction scopes? Could anyone post an example? In addition I'd need the prcoess to work for SQL Server 2005 AND Oracle 10g databases... will transaction scopes work with both database engines?

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• How to migrate Django models from mysql to sqlite (or between any two database systems)?

  - by Daphna Shezaf

  I have a Django deployment in production that uses MySQL. I would like to do further development with SQLite, so I would like to import my existing data to an SQLite database. I There is a shell script here to convert a general MySQL dump to SQLite, but it didn't work for me (apparently the general problem isn't easy). I figured doing this using the Django models must be much easier. How would you do this? Does anyone have any script to do this?

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• Is there a way to launch an aggressive and complete garbage collection in Java?

  - by Gnoupi

  For memory optimization reasons, I'm launching myself the garbage collector during profiling, to check if objects are correctly cleaned after disposing of them. The call to garbage collector is not enough, though, and it seems that there is no guarantee of what it will clean. Is there a way to call it, to be sure it will recover as much as it can, in profiling conditions (this would have no point in production, of course)? Or is "calling it several times" the only way to be "almost sure"? Or did I simply misunderstand something about the Garbage Collector?

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• Why am I getting a Java NoSuchPortException when the port exists?

  - by user258526

  Got the following production code below, I'm using it for a new driver. portName is COM4 and this port exists on the PC (and I can connect to it with hyperterminal), so why does Javacomm throw a NoSuchPortException? COM4 shows up fine in device mgr. too final String portName = getSerialPort(); try { final CommPortIdentifier id = CommPortIdentifier.getPortIdentifier(portName); port = (SerialPort) id.open(getName(), 1000); } catch (NoSuchPortException nspe) { report(SeverityCode.LEVEL2, getName(), "PIN Pad is not connected to " + portName + " port, or the port does not exist."); return; } catch (PortInUseException piue) { report(SeverityCode.LEVEL2, getName(), portName + " port is already in-use by some other device. Reason: " + piue.getMessage()); return; }

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• passenger and nginx ssl conf

  - by chief

  I am having some trouble with the nginx https setting in the nginx.conf file. server { listen 443; server_name domain.com; root /path/current/public/; passenger_enabled on; rails_env production; ssl on; ssl_certificate combined.crt; ssl_certificate_key key; When I attempt to open a page requiring https nginx throws a 404 error.

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• C++0x implementation guesstimates?

  - by dsimcha

  The C++0x standard is on its way to being complete. Until now, I've dabbled in C++, but avoided learning it thoroughly because it seems like it's missing a lot of modern features that I've been spoiled by in other languages. However, I'd be very interested in C++0x, which addresses a lot of my complaints. Any guesstimates, after the standard is ratified, as to how long it will take for major compiler vendors to provide reasonably complete, production-quality implementations? Will it happen soon enough to reverse the decline in C++'s popularity, or is it too little, too late? Do you believe that C++0x will become "the C++" within a few years, or do you believe that most people will stick to the earlier standard in practice and C++0x will be somewhat of a bastard stepchild, kind of like C99?

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• .net (winforms, not asp) multi-server deployment

  - by poiuyttr

  I have a small .NET WinForms application, and couple of linux servers, DEV and CL1,CL2..CLN (DEV is development server and CL* are servers which belons to our clients, they are in private networks and it's a kind of production servers) I want an update mechanism so that (1) i develop a new version and publish it to a DEV (2) users of DEV-server install latest version from DEV (3) users of CL2 (employees of client2) install stable version from CL-2 directly (4) application checks for updates using server it was installed from (so, if it was installed from CL-2, it should check CL-2 for updates) (5) i should be able to propogate the update to a selected CL-server (using just file copy & maybe sed; not republishing), if i want that (and if i don't, that CL-server will have an old version until manually i update it) I tried to use clickonce, but looks like it meets only first two requirements. What should i do?

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• How does Scrum work when you have multiple projects?

  - by Tim K.

  I'm fairly well read in the benefits and processes of Scrum. I get the ideas on the backlog, burndown charts, iterations, using user stories, and other various concepts of the Scrum "framework". With that said... I work for a web development firm that manages multiple projects at one time, with six team members that make up the "production team". How does Scrum work with having multiple projects? Do you still just schedule an iteration for a single project in a certain amount of time and the entire team works on it, and then you move on to the next project with a new iteration when that iteration is completed? Or is there an "agile" way in managing multiple projects with their own iterations with only one team at the same time?

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• (When) Does hardware, especially the CPU(s), deliver wrong results?

  - by sub

  What I'm talking about is: Is it possible that under certain circumstances the CPU "buggs" and suddenly responses 1+1=2? In which parts of the computer can that happen (HDD, RAM, Mainboard)? What could be the causes? Bad quality? Overheating? Does that even happen? When yes, how frequently? If everything is okay with the CPU (not a single fault in production, good temperature), can that still happen sometimes? What would be the results of, let's say one to three wrong computations? This is programming related as it would be nice to know if you can even rely on the hardware to return the right results.

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• How can I pass in specific parameters to mstest in Visual Studio

  - by Eric Langland

  I'm trying to modify my test projuect to allow for remote invocation of an api we're building. Right now the tests are hard coded to run locally(against localhost), but I would like to be able to point the tests at any endpoint (even remote ones in production). Ideally there would be a place in the .testsettings for config values to be stored. Sadly this isn't the case. Or, being able to pass parameters to MSTest that the test would read...? Any ideas? Thanks in advance.

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• Why can I derived from a templated/generic class based on that type in C# / C++

  - by stusmith

  Title probably doesn't make a lot of sense, so I'll start with some code: class Foo : public std::vector<Foo> { }; ... Foo f; f.push_back( Foo() ); Why is this allowed by the compiler? My brain is melting at this stage, so can anyone explain whether there are any reasons you would want to do this? Unfortunately I've just seen a similar pattern in some production C# code and wondered why anyone would use this pattern.

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• SSIS Script Component + Helper Assemblies (.dll's)

  - by Nev_Rahd

  I got a script component which does Transformation / DataType conversions / Creating some calculated columns. All the transform validations / datatype conversion methods and for new column generation is put into custom .dll. As this script component would be same for all other tables, only thing is to define input / ouput columns and apply validation methods on required columns. This all works fine. On production server where do I need to deploy my .dll. Would just putting it into GAC will be enough or need to do something else. Regards

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• Deploying Rails app over VPN

  - by DavidGouge

  You'll have to bear with me as I'm not a Ruby dev, but have inherited a Ruby system. I need to deploy some changes to the app from my repository to the server. I've been instructed to run cap deploy and told that that script will get the latest code from my repository and deploy it to the server. My problem is that I have to VPN to get to the production server and the VPN client then blocks access to my local network, cutting off the repository. So my question is, how can I change my deploy.rb so that I can deploy from my local machine instead? Or is there a better way. If you need to see the deploy.rb, please let me know. Thanks Dave

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• SQL 2008 table locked - can't work out why

  - by Mr. Flibble

  I have two databases on one SQL 2008 server. Database 1 seems to be causing a lock on a table on database 2. There no queries are running on database 1 that should affect database 2. Is this normal behaviour? When I view the running queries with this command SELECT sqltext.TEXT, req.session_id, req.status, req.command, req.cpu_time, req.total_elapsed_time/1000 [seconds] FROM sys.dm_exec_requests req CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS sqltext it tells me as much, and says that the command on database 2 is suspended. I'm at a bit of a loss. What sort of things should I look at to work out why the table in database 2 is locked?

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• Different icons and title for same iPad application

  - by trapo

  I'm developing an iPad application that will be distributed "in-house" ie only inside enterprise. They asked me if i can produce 2 different releases of the same application to be installed on the same iPad. The first one will communicate with a production server while the second will use a sandbox server and will be used by user to learn the system. Server url will be changed in app settings. They told me to differentiate these releases by icon and title (and also, of course, by title in navigation bar). What's the best way to get this goal avoiding duplication of the project?

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• Search server 2008 express working with WSS 3.0 (error when crawl second web application (website) s

  - by tberube

  My search server 2008 express crawls 3 sharepoint servers and 1 windows file server. The file server and 2 other sharepoint server crawl all content and master and sub sites just fine. On the 3rd sharepoint server the default site crawl just fine...The second web application site (content database) crawls the top site and crawls all sub sites BUT The subsites get the below error in the crawl log. Deleted by the gatherer (The start address or content source that contained this item was deleted and hence this item was deleted.) I have checked the security rights (OK) I have checked the setting to crawl a SharePoint site (if wrong the top site would not work)... ???? Last part = I can crawl 3 other sharepoint sites (web applications/other content databases) on the same server...It seems to be just this one site...

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• How painful is a django project deployment to a live (staging) site?

  - by Ignacio

  Hi, I've getting quite fast with a small django project of mine, which I'm developing locally, of course. But, as I had never worked with django before, I'm not aware of what it implies to upload it and test it on a production server. And I'm quite curious, since I'm very eager to test an early release live. I know there is this document, which I think it'll be really helpful: http://djangobook.com/en/2.0/chapter12/ But, are there any details I should take into account before, during and after the deployment? Any advice or best practices? Thanks.

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• Prevent log4net to send duplicate issues via SMTP

  - by jrEwing

  Hi, we have bridged our log4net with Jira using SMTP. Now we are worried that since the site is public what could happen to the Jira server if we get alot of issues in the production environment. We have already filtered on Critical and Fatal, but we want to see either some acumulator service on log4net or a plain filter which identifies repeating issues and prevents them from being sent via Email. Preferably without having to change the error reporting code, so a config solution would be best. I guess dumping the log into a db and then create a separate listener some smart code would be a (pricy) alternative.

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• Terminal Asks for Email and Password, how do I Programmatically fill it out (in Ruby)?

  - by viatropos

  I am running a command to push files to Google App Engine, and it might ask me for my email and password: $ appcfg.py update . Email: [email protected] Password: I am running that in Ruby right now using this: %x[appcfg.py update .]. How can I fill out the email and password? I have seen something like this with capistrano: %x[appcfg.py update .] do |channel, stream, data| channel.send_data "#{yaml['production']['email']}\n" if data =~ /^Email:/ end ...but haven't figured out how to set that up without it. What's the best way to fill out things the command line asks for programmatically?

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• OpenGL Mapping Textures to a Grid Stored Inside Vertex Array

  - by Matthew Hoggan

  I am writing a test to verify something. This is not production code, just verification code. So I would appreciate it if the specific question was answered. I have code that uses indices and vertices to draw a set of triangles in the shape of a grid. All the vertices are drawn using glDrawElements(). Now for each vertex I will set its corresponding Texture Coordinates to 0 or 1 for each set of triangles that form a square in the grid. Basically I want to draw a collage of random textures in each one of the "squares" (consisting of two triangles). I can do this using the glBegin() and glEnd() method calls inside a for loop using the fixed functional pipeline, but I would like to know how to do this using Vertex Arrays.

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• ASP.NET Speed up DataView sorting/paging

  - by rlb.usa

  I have a page in ASP.NET where I'm using a Repeater to display a record listing. But it's slow as molasses, I've been tasked with speeding it up (sorting,paging). I've got it set up as follows: When user enters page, grab all of the data from the database (500 records, up to 4 relation'ed records) Store it all in Application["MyDataView"] On sort or paging, simply use the data view's internal sort/page method (no db calls) and rebind. I understand that databases can take time to query, but simply to have the DataView call it's sort method (no db calls) takes 10ish seconds, that's an alarmingly slow. Two questions: Why is it taking so long? How can I speed it up? A gridview is not possible.

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• When is BIG, big enough for a database?

  - by David ???

  I'm developing a Java application that has performance at its core. I have a list of some 40,000 "final" objects, i.e., I have an initialization input data of 40,000 vectors. This data is unchanged throughout the program's run. I am always preforming lookups against a single ID property to retrieve the proper vectors. Currently I am using a HashMap over a sub-sample of a 1,000 vectors, but I'm not sure it will scale to production. When is BIG, actually big enough for a use of DB? One more thing, an SQLite DB is a viable option as no concurrency is involved, so I guess the "threshold" for db use, is perhaps lower.

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• Is it possible to access the line of code where a method is called from within that method?

  - by Dan Tao

  Disclaimers: I am not interested in doing this in any real production code. I make no claim that there's a good reason why I'm interested in doing this. I realize that if this is in any way possible, it must involve doing some highly inadvisable things. That said... is this possible? I'm really just curious to know. In other words, if I have something like this: int i = GetSomeInteger(); Is there any way from within GetSomeInteger that the code could be "aware of" the fact that it's being called in an assignment to the variable i? Again: no interest in doing this in any sort of real scenario. Just curious!

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