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• Template neglects const (why?)

  - by Gabriel

  Does somebody know, why this compiles?? template< typename TBufferTypeFront, typename TBufferTypeBack = TBufferTypeFront> class FrontBackBuffer{ public: FrontBackBuffer( const TBufferTypeFront front, const TBufferTypeBack back): ////const reference assigned to reference??? m_Front(front), m_Back(back) { }; ~FrontBackBuffer() {}; TBufferTypeFront m_Front; ///< The front buffer TBufferTypeBack m_Back; ///< The back buffer }; int main(){ int b; int a; FrontBackBuffer<int&,int&> buffer(a,b); // buffer.m_Back = 33; buffer.m_Front = 55; } I compile with GCC 4.4. Why does it even let me compile this? Shouldn't there be an error that I cannot assign a const reference to a non-const reference?

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• C++ map performance - Linux (30 sec) vs Windows (30 mins) !!!

  - by sonofdelphi

  I need to process a list of files. The processing action should not be repeated for the same file. The code I am using for this is - using namespace std; vector<File*> gInputFileList; //Can contain duplicates, File has member sFilename map<string, File*> gProcessedFileList; //Using map to avoid linear search costs void processFile(File* pFile) { File* pProcessedFile = gProcessedFileList[pFile->sFilename]; if(pProcessedFile != NULL) return; //Already processed foo(pFile); //foo() is the action to do for each file gProcessedFileList[pFile->sFilename] = pFile; } void main() { size_t n= gInputFileList.size(); //Using array syntax (iterator syntax also gives identical performance) for(size_t i=0; i<n; i++){ processFile(gInputFileList[i]); } } The code works correctly, but... My problem is that when the input size is 1000, it takes 30 minutes - HALF AN HOUR - on Windows/Visual Studio 2008 Express (both Debug and Release builds). For the same input, it takes only 40 seconds to run on Linux/gcc! What could be the problem? The action foo() takes only a very short time to execute, when used separately. Should I be using something like vector::reserve for the map?

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• Why is function's length information of other shared lib in ELF?

  - by minastaros

  Our project (C++, Linux, gcc, PowerPC) consists of several shared libraries. When releasing a new version of the package, only those libs should change whose source code was actually affected. With "change" I mean absolute binary identity (the checksum over the file is compared. Different checksum - different version according to the policy). (I should mention that the whole project is always built at once, no matter if any code has changed or not per library). Usually this can by achieved by hiding private parts of the included Header files and not changing the public ones. However, there was a case where just a delete was added to the destructor of a class TableManager (in the TableManager.cpp file!) of library libTableManager.so, and yet the binary/checksum of library libB.so (which uses class TableManager ) has changed. TableManager.h: class TableManager { public: TableManager(); ~TableManager(); private: int* myPtr; } TableManager.cpp: TableManager::~TableManager() { doSomeCleanup(); delete myPtr; // this delete has been added } By inspecting libB.so with readelf --all libB.so, looking at the .dynsym section, it turned out that the length of all functions, even the dynamically used ones from other libraries, are stored in libB! It looks like this (length is the 668 in the 3rd column): 527: 00000000 668 FUNC GLOBAL DEFAULT UND _ZN12TableManagerD1Ev So my questions are: Why is the length of a function actually stored in the client lib? Wouldn't a start address be sufficient? Can this be suppressed somehow when compiling/linking of libB.so (kind of "stripping")? We would really like to reduce this degree of dependency...

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• Strange compilation error on reference passing argument to function

  - by Grewdrewgoo Goobergabbsoen

  Here's the code: #include <iostream> using namespace std; void mysize(int &size, int size2); int main() { int *p; int val; p = &val; cout << p; mysize(&val, 20); // Error is pointed here! } void mysize(int &size, int size2) { cout << sizeof(size); size2 = size2 + 6000; cout << size2; } Here's the error output from GCC: In function 'int main()': Line 10: error: invalid initialization of non-const reference of type 'int&' from a temporary of type 'int*' compilation terminated due to -Wfatal-errors. What does that imply? I do not understand the error message ... invalid initialization of a non-constant? I declared the prototype function above with two parameters to take, one a reference of an integer and one just an integer value itself. I passed the reference of the int (see line 10), yet this error keeps being thrown at me. What is the issue?

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• Receiving "expected expression before" Error When Using A Struct

  - by Zach Dziura

  I'm in the process of creating a simple 2D game engine in C with a group of friends at school. I'd like to write this engine in an Object-Oriented way, using structs as classes, function pointers as methods, etc. To emulate standard OOP syntax, I created a create() function which allocates space in memory for the object. I'm in the process of testing it out, and I'm receiving an error. Here is my code for two files that I'm using to test: test.c: #include <stdio.h> int main() { typedef struct { int i; } Class; Class *test = (Class*) create(Class); test->i = 1; printf("The value of \"test\" is: %i\n", test->i); return 0; } utils.c: #include <stdio.h> #include <stdlib.h> #include "utils.h" void* create(const void* class) { void *obj = (void*) malloc(sizeof(class)); if (obj == 0) { printf("Error allocating memory.\n"); return (int*) -1; } else { return obj; } } void destroy(void* object) { free(object); } The utils.h file simply holds prototypes for the create() and destroy() functions. When I execute gcc test.c utils.c -o test, I'm receiving this error message: test.c: In function 'main': test.c:10:32: error: expected expression before 'Class' I know it has something to do with my typedef at the beginning, and how I'm probably not using proper syntax. But I have no idea what that proper syntax is. Can anyone help?

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• expected identifier or '(' before '{' token in Flex

  - by user1829177

  I am trying to use Flex to parse 'C' source code. Unfortunately I am getting the error "expected identifier or '(' before '{' token" on lines 1,12,13,14... . Any ideas why? %{ %} digit [0-9] letter [a-zA-Z] number (digit)+ id (letter|_)(letter|digit|_)* integer (int) character (char) comma [,] %% {integer} {return INT;} {character} {return CHAR;} {number} {return NUM;} {id} {return IDENTIFIER;} {comma} {return ',';} [-+*/] {return *yytext;} . {} %% main() { yylex(); } The corresponding flex file is as shown below: %{ #include <ctype.h> #include <stdio.h> #include "myhead.h" #include "mini.l" #define YYSTYPE double # undef fprintf %} %token INT %token CHAR %token IDENTIFIER %token NUM %token ',' %left '+' '-' %left '*' '/' %right UMINUS %% lines:lines expr '\n' {printf("%g\n",$2);} |lines '\n' |D | ; expr :expr '*' expr {$$=$1*$3;} |expr '/' expr {$$=$1/$3;} |expr '+' expr {$$=$1+$3;} |expr '-' expr {$$=$1+$3;} |'(' expr ')' {$$=$2;} |'-' expr %prec UMINUS {$$=-$2;} |IDENTIFIER {} |NUM {} ; T :INT {} |CHAR {} ; L :L ',' IDENTIFIER {} |IDENTIFIER {} ; D :T L {printf("T is %g, L is %g",$1,$2);} ; %% /*void yyerror (char *s) { fprintf (stderr, "%s\n", s); } */ I am compiling the generated code using the command: gcc my_file.c -ly

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• What influences running time of reading a bunch of images?

  - by remi

  I have a program where I read a handful of tiny images (50000 images of size 32x32). I read them using OpenCV imread function, in a program like this: std::vector<std::string> imageList; // is initialized with full path to the 50K images for(string s : imageList) { cv::Mat m = cv::imread(s); } Sometimes, it will read the images in a few seconds. Sometimes, it takes a few minutes to do so. I run this program in GDB, with a breakpoint further away than the loop for reading images so it's not because I'm stuck in a breakpoint. The same "erratic" behaviour happens when I run the program out of GDB. The same "erratic" behaviour happens with program compiled with/without optimisation The same "erratic" behaviour happens while I have or not other programs running in background The images are always at the same place in the hard drive of my machine. I run the program on a Linux Suse distrib, compiled with gcc. So I am wondering what could affect the time of reading the images that much?

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• Misaligned Pointer Performance

  - by Elite Mx

  Aren't misaligned pointers (in the BEST possible case) supposed to slow down performance and in the worst case crash your program (assuming the compiler was nice enough to compile your invalid c program). Well, the following code doesn't seem to have any performance differences between the aligned and misaligned versions. Why is that? /* brutality.c */ #ifdef BRUTALITY xs = (unsigned long *) ((unsigned char *) xs + 1); #endif ... /* main.c */ #include <stdio.h> #include <stdlib.h> #define size_t_max ((size_t)-1) #define max_count(var) (size_t_max / (sizeof var)) int main(int argc, char *argv[]) { unsigned long sum, *xs, *itr, *xs_end; size_t element_count = max_count(*xs) >> 4; xs = malloc(element_count * (sizeof *xs)); if(!xs) exit(1); xs_end = xs + element_count - 1; sum = 0; for(itr = xs; itr < xs_end; itr++) *itr = 0; #include "brutality.c" itr = xs; while(itr < xs_end) sum += *itr++; printf("%lu\n", sum); /* we could free the malloc-ed memory here */ /* but we are almost done */ exit(0); } Compiled and tested on two separate machines using gcc -pedantic -Wall -O0 -std=c99 main.c for i in {0..9}; do time ./a.out; done

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• Windows service: Listening on socket while running as LocalSystem

  - by Socob

  I'm writing a small server-like program in C for Windows (using MinGW/GCC, testing on Windows 7) which is eventually supposed to run as a service with the LocalSystem account. I am creating a socket, and using Windows Sockets bind(), listen() and accept() to listen for incoming connections. If I run the application from the command line (i.e. not as a service, but as a normal user), I have no problems connecting to it from external IPs. However, if I run the program as a service with the LocalSystem account, I can only connect to the service from my own PC, either with 127.0.0.1 or my local address, 192.168.1.80 (I'm behind a router in a small local network). Neither external IPs nor other PCs in the same local network, using my local address, can connect now, even though there were no problems without running as a service. Now, I've heard that networking is handled differently or even not accessible (?) when running as LocalSystem or LocalService or that services cannot access both the desktop and the network (note: my service is not interactive) at the same time due to security considerations. Essentially, I need to find out what's going wrong/how to listen for connections in a service. Is running as NetworkService the same as running as LocalSystem, but with network access? Surely there must be servers that can run as background services, so how do they do it?

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• How do virtual destructors work?

  - by Jack

  I am using gcc. I am aware how the virtual destructors solve the problem when we destroy a derived class object pointed by a base class pointer. I want to know how do they work? class A { public: A(){cout<<"A constructor"<<endl;} ~A(){cout<<"A destructor"<<endl;} }; class B:public A { public: B(){cout<<"B constructor"<<endl;} ~B(){cout<<"B destructor"<<endl;} }; int main() { A * a = new B(); delete a; getch(); return 0; } When I change A's destructor to a virtual function, the problem is solved. What is the inner working for this. Why do I make A's destructor virtual.

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• I am trying to access the individual bytes in a floating point number and I am getting unexpected results

  - by oweinh

  So I have this so far: #include <iostream> #include <string> #include <typeinfo> using namespace std; int main () { float f = 3.45; // just an example fp# char* ptr = (char*)&f; // a character pointer to the first byte of the fp#? cout << int(ptr[0]) << endl; // these lines are just to see if I get what I cout << int(ptr[1]) << endl; // am looking for... I want ints that I can cout << int(ptr[2]) << endl; // otherwise manipulate. cout << int(ptr[3]) << endl; } the result is: -51 -52 92 64 so obviously -51 and -52 are not in the byte range that I would expect for a char... I have taken information from similar questions to arrive at this code and from all discussions, a conversion from char to int is straightforward. So why negative values? I am trying to look at a four-byte number, therefore I would expect 4 integers, each in the range 0-255. I am using Codeblocks 13.12 with gcc 4.8.1 with option -std=C++11 on a Windows 8.1 device.

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• compile error:c language in telnet(linux)

  - by lilyrose07

  #include<stdio.h> #include<unistd.h> #include<stdlib.h> #include<pthread.h> int count=0; void *thread_function(void *arg) { while(count<10) { if(count%2==1) { count++; } else {sleep(1);} } } int main(int argc,int *argv) { int res; pthread_t a_thread[2]; void *thread_result; int n; while(count<10) { if(count%2==0) {printf("%d",count); count++; } else{sleep(1);} } for(n=0;n<2;n++) { pthread_create(&(a_thread[n]),NULL,thread_function,NULL); } while(count==9) {pthread_join(a_thread[0],&thread_result); } while(count==10) { pthread_join(a_thread[1],&thread_result); } printf("%d",count); return 0; } in telnet,linux i write gcc za.c error list: undefined reference to pthread_create,pthread_join in function 'main' //why??

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• isalpha(<mychar>) == true evaluates to false??

  - by Buttink

  string temp is equal to "ZERO:\t.WORD\t1" from my debugger. (the first line of my file) string temp = RemoveWhiteSpace(data); int i = 0; if ( temp.length() > 0 && isalpha(temp[0]) ) cout << "without true worked" << endl; if ( temp.length() > 0 && isalpha(temp[0]) == true ) cout << "with true worked" << endl; This is my code to check if first character of temp is a a-z,A-Z. The first if statement will evaluate to true and the 2nd to false. WHY?!?!?! I have tried this even without the "temp.length() 0 &&" and it still evaluates false. It just hates the "== true". The only thing I can think of is that isalpha() returns != 0 and true == 1. Then, you could get isalpha() == 2 != 1. But, I have no idea if C++ is that ... weird. BTW, I dont need to know that the "== true" is logically pointless. I know. output was without true worked Compiled with CodeBlock using GNU GCC on Ubuntu 9.10 (if this matters any)

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• CodePlex Daily Summary for Thursday, April 05, 2012

  CodePlex Daily Summary for Thursday, April 05, 2012Popular ReleasesCommunity TFS Build Extensions: April 2012: Release notes to follow...ClosedXML - The easy way to OpenXML: ClosedXML 0.65.2: Aside from many bug fixes we now have Conditional Formatting The conditional formatting was sponsored by http://www.bewing.nl (big thanks) New on v0.65.1 Fixed issue when loading conditional formatting with default values for icon sets New on v0.65.2 Fixed issue loading conditional formatting Improved inserts performanceLiberty: v3.2.0.0 Release 4th April 2012: Change Log-Added -Halo 3 support (invincibility, ammo editing) -Halo 3: ODST support (invincibility, ammo editing) -The file transfer page now shows its progress in the Windows 7 taskbar -"About this build" settings page -Reach Change what an object is carrying -Reach Change which node a carried object is attached to -Reach Object node viewer and exporter -Reach Change which weapons you are carrying from the object editor -Reach Edit the weapon controller of vehicles and turrets -An error dia...MSBuild Extension Pack: April 2012: Release Blog Post The MSBuild Extension Pack April 2012 release provides a collection of over 435 MSBuild tasks. A high level summary of what the tasks currently cover includes the following: System Items: Active Directory, Certificates, COM+, Console, Date and Time, Drives, Environment Variables, Event Logs, Files and Folders, FTP, GAC, Network, Performance Counters, Registry, Services, Sound Code: Assemblies, AsyncExec, CAB Files, Code Signing, DynamicExecute, File Detokenisation, GUID’...DotNetNuke® Community Edition CMS: 06.01.05: Major Highlights Fixed issue that stopped users from creating vocabularies when the portal ID was not zero Fixed issue that caused modules configured to be displayed on all pages to be added to the wrong container in new pages Fixed page quota restriction issue in the Ribbon Bar Removed restriction that would not allow users to use a dash in page names. Now users can create pages with names like "site-map" Fixed issue that was causing the wrong container to be loaded in modules wh...51Degrees.mobi - Mobile Device Detection and Redirection: 2.1.3.1: One Click Install from NuGet Changes to Version 2.1.3.11. [assembly: AllowPartiallyTrustedCallers] has been added back into the AssemblyInfo.cs file to prevent failures with other assemblies in Medium trust environments. 2. The Lite data embedded into the assembly has been updated to include devices from December 2011. The 42 new RingMark properties will return Unknown if RingMark data is not available. Changes to Version 2.1.2.11Code Changes 1. The project is now licenced under the Mozilla...MVC Controls Toolkit: Mvc Controls Toolkit 2.0.0: Added Support for Mvc4 beta and WebApi The SafeqQuery and HttpSafeQuery IQueryable implementations that works as wrappers aroung any IQueryable to protect it from unwished queries. "Client Side" pager specialized in paging javascript data coming either from a remote data source, or from local data. LinQ like fluent javascript api to build queries either against remote data sources, or against local javascript data, with exactly the same interface. There are 3 different query objects exp...ExtAspNet: ExtAspNet v3.1.2: ExtAspNet - ?? ExtJS ??? ASP.NET 2.0 ???，????? AJAX ?????????? ExtAspNet ????? ExtJS ??? ASP.NET 2.0 ???，????? AJAX ??????????。 ExtAspNet ??????? JavaScript，?? CSS，?? UpdatePanel，?? ViewState，?? WebServices ???????。 ??????: IE 7.0, Firefox 3.6, Chrome 3.0, Opera 10.5, Safari 3.0+ ????：Apache License 2.0 (Apache) ??：http://extasp.net/ ??：http://bbs.extasp.net/ ??：http://extaspnet.codeplex.com/ ??：http://sanshi.cnblogs.com/ ????： +2012-04-04 v3.1.2 -??IE?????????????BUG（??"about:blank"?...nopCommerce. Open source shopping cart (ASP.NET MVC): nopcommerce 2.50: Highlight features & improvements: • Significant performance optimization. • Allow store owners to create several shipments per order. Added a new shipping status: “Partially shipped”. • Pre-order support added. Enables your customers to place a Pre-Order and pay for the item in advance. Displays “Pre-order” button instead of “Buy Now” on the appropriate pages. Makes it possible for customer to buy available goods and Pre-Order items during one session. It can be managed on a product variant ...WiX Toolset: WiX v3.6 RC0: WiX v3.6 RC0 (3.6.2803.0) provides support for VS11 and a more stable Burn engine. For more information see Rob's blog post about the release: http://robmensching.com/blog/posts/2012/4/3/WiX-v3.6-Release-Candidate-Zero-availableSageFrame: SageFrame 2.0: Sageframe is an open source ASP.NET web development framework developed using ASP.NET 3.5 with service pack 1 (sp1) technology. It is designed specifically to help developers build dynamic website by providing core functionality common to most web applications.iTuner - The iTunes Companion: iTuner 1.5.4475: Fix to parse empty playlists in iTunes LibraryDocument.Editor: 2012.2: Whats New for Document.Editor 2012.2: New Save Copy support New Page Setup support Minor Bug Fix's, improvements and speed upsDotNet.Highcharts: DotNet.Highcharts 1.2 with Examples: Tested and adapted to the latest version of Highcharts 2.2.1 Fixed Issue 359: Not implemented serialization array of type: System.Drawing.Color[] Fixed Issue 364: Crosshairs defined as array of CrosshairsForamt generates bad Highchart code For the example project: Added newest version of Highcharts 2.2.1 Added new demos to How To's section: Bind Data From Dictionary Bind Data From Object List Custom Theme Tooltip Crosshairs Theming The Reset Button Plot Band EventsVidCoder: 1.3.2: Added option for the minimum title length to scan. Added support to enable or disable LibDVDNav. Added option to prompt to delete source files after clearing successful completed items. Added option to disable remembering recent files and folders. Tweaked number box to only select all on a quick click.MJP's DirectX 11 Samples: Light Indexed Deferred Rendering: Implements light indexed deferred using per-tile light lists calculated in a compute shader, as well as a traditional deferred renderer that uses a compute shader for per-tile light culling and per-pixel shading.Pcap.Net: Pcap.Net 0.9.0 (66492): Pcap.Net - March 2012 Release Pcap.Net is a .NET wrapper for WinPcap written in C++/CLI and C#. It Features almost all WinPcap features and includes a packet interpretation framework. Version 0.9.0 (Change Set 66492)March 31, 2012 release of the Pcap.Net framework. Follow Pcap.Net on Google+Follow Pcap.Net on Google+ Files Pcap.Net.DevelopersPack.0.9.0.66492.zip - Includes all the tutorial example projects source files, the binaries in a 3rdParty directory and the documentation. It include...Extended WPF Toolkit: Extended WPF Toolkit - 1.6.0: Want an easier way to install the Extended WPF Toolkit?The Extended WPF Toolkit is available on Nuget. What's in the 1.6.0 Release?BusyIndicator ButtonSpinner Calculator CalculatorUpDown CheckListBox - Breaking Changes CheckComboBox - New Control ChildWindow CollectionEditor CollectionEditorDialog ColorCanvas ColorPicker DateTimePicker DateTimeUpDown DecimalUpDown DoubleUpDown DropDownButton IntegerUpDown Magnifier MaskedTextBox MessageBox MultiLineTex...Media Companion: MC 3.434b Release: General This release should be the last beta for 3.4xx. If there are no major problems, by the end of the week it will upgraded to 3.500 Stable! The latest mc_com.exe should be included too! TV Bug fix - crash when using XBMC scraper for TV episodes. Bug fix - episode count update when adding new episodes. Bug fix - crash when actors name was missing. Enhanced TV scrape progress text. Enhancements made to missing episodes display. Movies Bug fix - hide "Play Trailer" when multisaev...Better Explorer: Better Explorer 2.0.0.831 Alpha: - A new release with: - many bugfixes - changed icon - added code for more failsafe registry usage on x64 systems - not needed regfix anymore - added ribbon shortcut keys - Other fixes Note: If you have problems opening system libraries, a suggestion was given to copy all of these libraries and then delete the originals. Thanks to Gaugamela for that! (see discussion here: 349015 ) Note2: I was upload again the setup due to missing file!New Projects20120229Site1: 29/02/2012 site5B12: Un servizio WCF .NET 4.0 fruibile in modalità REST da Android e IOS IPhone e IPad. Realizzato dai ragazzi di 5BI Informatica dell'ITIS L. Da Vinci - Rimini A.S. 2011/12Accept Language Setter: Accept Language Setter is a System Tray application that lets you quickly set your browser's Accept Language without having to navigate through your browser's menus. It is ideal for developers and testers who work on internationalized websites and need to switch languages often.AGatherBot: C# 5.0 (.NET Framework 4.5) based Counter-Strike 1.6 Gatherbot, highly extensible (using MEF) and configurable.Aweber API .NET SDK: The Aweber API .NET SDK makes it easier communicating with Aweber's API. It covers the basic parts of the API including, lists, subscribers, campaigns and accounts. It is developed in C# .NET 4.0CINET: Continuous Integration Server developed in .Net with MonoClipster: Manage & watch your videos instantly. A project for the course Human Computer Interaction, CS3240 in National University of SingaporeDyna Bomber: With my friend we will try to reborn old game called Dyna Bober.Fer. CR: Pruebas de Software 2012 - DemoFreeDAM: While looking at DAM (Digital Asset Management) solutions, I have found that some of the paid versions are actually just putting a front-end on top of free tools that are actually doing the heavy lifting. This project will give you the freedom to choose a free-dam solution.golang: Go language LLVM compilerHSDLL: HSDLLJsQueryExpression: JsQueryExpression aims to create a javascript library to generate URIs by using QueryExpression (name is inspired from Microsoft Dynamics CRM but structure is different) object model to query OData resources.KunalPishewsccsemb: KunalPishewsccsembLightFarsiDictionary - ??????? ??? ?????/???????: A light weight farsi-english / engilsh-farsi dictionary optimized for fixing common typo mistakes. ??????? ??? ? ???? ????? ?? ??????? / ??????? ?? ????? ?? ???? ?????? ?????? ?????? ?? ????? ?? ???.losezhang: ???TFS??，???30????！MIC Thailand #9 Foursquare: Sample for Maps and GeolocatiohnMtk: Mtk is a toolkit for ASP.NET MVC and FluentNHibernate.MyTest: test test testOpenSocial container on .NET: .NET implementation of OpenSocial containerOrchard Bootstrap: Bootstrap is an Orchard theme constructed using the Bootstrap template system from Twitter.PetroManager: this is a basic data management application.Portable Xna Components: Portable Xna Components makes it easier and faster for Xna game developers to create their games. Developers using this library don't have to worry about rudimentary tasks like drawing and collision detection. It is written in C#Project Management Plug-Ins: Restores functionality to create Microsoft Visio diagrams from Microsoft Project data, via a Microsoft Project AddIn.Project vit: some projectpruebas2012-1: demo de pruebas de softwarePSW20121: demo de pruebas de swPWS 2012-1: Demo para el curso de PWS UPN Cajamarca 2012 - 1Pws2012-1: Demo de calidad prueba de softwarePWSmodelo-2012-1: Demo Para le curso de pws upnradscommerce: Multi shop ecommerce system for web hoster, retailer for Indian Market and then for others.Randata: A DataProvider framework.Robots In Donutland: A solution for a project at DMU - Intelligent systems and roboticsShopScan - Application WP7 winner of Hackathon le Mobile 2012: Application WP7 winner of Hackathon le Mobile 2012Silverlight Printer Map: This printer map makes it easier for an end user in an enterprise to find and install networked printers. The end user need only find the closest printer on the map of the organization, click on it once and it then allow the program to map the printer, install the driver and set it as default printer. It's developed in C# The backend of this program relies on SharePoint 2010 libraries. See documentation for further information.SquareTasks: Gestionnaire de tâchesStructurizer: A tool to generate tiles for DNA self-assembly. Outputs a 2-dimensional map with corresponding glues which allow for use with any core substrate.WCF Duplex Service on Azure using a Silverlight Client: I had some trouble to build correctly a simple WCF Duplex Service that run on Windows AZURE while the Connection is made anonymously, after a lot of research I decided to share my solutionWord to MS-Test: Converts MS-Word document in a format similiar to FitNesse, to MS-Test source code.WPFModalDialog: Custom modal dialog in Wpf, contains basic controls in dialog window, also allow you to inform user about loading operations, using animated watcherXRM Developer Framework: XRM Developer Framework provides you with a Framework & Tools to easily build Enterprise Dynamics CRM 2011 Solutions using patterns & best practices. The Framework builds on many available technologies such as Visual Studio, CRM Developer Toolkit & Moq.

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• dbus dependency with yum

  - by Hengjie

  Whenever, I try and run yum update I get the following error: [root@server ~]# yum update Loaded plugins: dellsysid, fastestmirror Loading mirror speeds from cached hostfile * base: mirror01.idc.hinet.net * extras: mirror01.idc.hinet.net * rpmforge: fr2.rpmfind.net * updates: mirror01.idc.hinet.net Excluding Packages in global exclude list Finished Setting up Update Process Resolving Dependencies --> Running transaction check ---> Package NetworkManager.x86_64 1:0.7.0-13.el5 set to be updated ---> Package NetworkManager-glib.x86_64 1:0.7.0-13.el5 set to be updated ---> Package SysVinit.x86_64 0:2.86-17.el5 set to be updated ---> Package acl.x86_64 0:2.2.39-8.el5 set to be updated ---> Package acpid.x86_64 0:1.0.4-12.el5 set to be updated ---> Package apr.x86_64 0:1.2.7-11.el5_6.5 set to be updated ---> Package aspell.x86_64 12:0.60.3-12 set to be updated ---> Package audit.x86_64 0:1.8-2.el5 set to be updated ---> Package audit-libs.x86_64 0:1.8-2.el5 set to be updated ---> Package audit-libs-python.x86_64 0:1.8-2.el5 set to be updated ---> Package authconfig.x86_64 0:5.3.21-7.el5 set to be updated ---> Package autofs.x86_64 1:5.0.1-0.rc2.163.el5 set to be updated ---> Package bash.x86_64 0:3.2-32.el5 set to be updated ---> Package bind.x86_64 30:9.3.6-20.P1.el5 set to be updated ---> Package bind-libs.x86_64 30:9.3.6-20.P1.el5 set to be updated ---> Package bind-utils.x86_64 30:9.3.6-20.P1.el5 set to be updated ---> Package binutils.x86_64 0:2.17.50.0.6-20.el5 set to be updated ---> Package centos-release.x86_64 10:5-8.el5.centos set to be updated ---> Package centos-release-notes.x86_64 0:5.8-0 set to be updated ---> Package coreutils.x86_64 0:5.97-34.el5_8.1 set to be updated ---> Package cpp.x86_64 0:4.1.2-52.el5 set to be updated ---> Package cpuspeed.x86_64 1:1.2.1-10.el5 set to be updated ---> Package crash.x86_64 0:5.1.8-1.el5.centos set to be updated ---> Package cryptsetup-luks.x86_64 0:1.0.3-8.el5 set to be updated ---> Package cups.x86_64 1:1.3.7-30.el5 set to be updated ---> Package cups-libs.x86_64 1:1.3.7-30.el5 set to be updated ---> Package curl.x86_64 0:7.15.5-15.el5 set to be updated --> Processing Dependency: dbus = 1.1.2-15.el5_6 for package: dbus-libs ---> Package dbus.x86_64 0:1.1.2-16.el5_7 set to be updated ---> Package dbus-libs.x86_64 0:1.1.2-16.el5_7 set to be updated ---> Package device-mapper.x86_64 0:1.02.67-2.el5 set to be updated ---> Package device-mapper-event.x86_64 0:1.02.67-2.el5 set to be updated ---> Package device-mapper-multipath.x86_64 0:0.4.7-48.el5_8.1 set to be updated ---> Package dhclient.x86_64 12:3.0.5-31.el5 set to be updated ---> Package dmidecode.x86_64 1:2.11-1.el5 set to be updated ---> Package dmraid.x86_64 0:1.0.0.rc13-65.el5 set to be updated ---> Package dmraid-events.x86_64 0:1.0.0.rc13-65.el5 set to be updated ---> Package dump.x86_64 0:0.4b41-6.el5 set to be updated ---> Package e2fsprogs.x86_64 0:1.39-33.el5 set to be updated ---> Package e2fsprogs-devel.x86_64 0:1.39-33.el5 set to be updated ---> Package e2fsprogs-libs.x86_64 0:1.39-33.el5 set to be updated ---> Package ecryptfs-utils.x86_64 0:75-8.el5 set to be updated ---> Package file.x86_64 0:4.17-21 set to be updated ---> Package finger.x86_64 0:0.17-33 set to be updated ---> Package firstboot-tui.x86_64 0:1.4.27.9-1.el5.centos set to be updated ---> Package freetype.x86_64 0:2.2.1-28.el5_7.2 set to be updated ---> Package freetype-devel.x86_64 0:2.2.1-28.el5_7.2 set to be updated ---> Package ftp.x86_64 0:0.17-37.el5 set to be updated ---> Package gamin.x86_64 0:0.1.7-10.el5 set to be updated ---> Package gamin-python.x86_64 0:0.1.7-10.el5 set to be updated ---> Package gawk.x86_64 0:3.1.5-15.el5 set to be updated ---> Package gcc.x86_64 0:4.1.2-52.el5 set to be updated ---> Package gcc-c++.x86_64 0:4.1.2-52.el5 set to be updated ---> Package glibc.i686 0:2.5-81.el5_8.1 set to be updated ---> Package glibc.x86_64 0:2.5-81.el5_8.1 set to be updated ---> Package glibc-common.x86_64 0:2.5-81.el5_8.1 set to be updated ---> Package glibc-devel.x86_64 0:2.5-81.el5_8.1 set to be updated ---> Package glibc-headers.x86_64 0:2.5-81.el5_8.1 set to be updated ---> Package gnutls.x86_64 0:1.4.1-7.el5_8.2 set to be updated ---> Package groff.x86_64 0:1.18.1.1-13.el5 set to be updated ---> Package gtk2.x86_64 0:2.10.4-21.el5_7.7 set to be updated ---> Package gzip.x86_64 0:1.3.5-13.el5.centos set to be updated ---> Package hmaccalc.x86_64 0:0.9.6-4.el5 set to be updated ---> Package htop.x86_64 0:1.0.1-2.el5.rf set to be updated ---> Package hwdata.noarch 0:0.213.26-1.el5 set to be updated ---> Package ifd-egate.x86_64 0:0.05-17.el5 set to be updated ---> Package initscripts.x86_64 0:8.45.42-1.el5.centos set to be updated ---> Package iproute.x86_64 0:2.6.18-13.el5 set to be updated ---> Package iptables.x86_64 0:1.3.5-9.1.el5 set to be updated ---> Package iptables-ipv6.x86_64 0:1.3.5-9.1.el5 set to be updated ---> Package iscsi-initiator-utils.x86_64 0:6.2.0.872-13.el5 set to be updated ---> Package kernel.x86_64 0:2.6.18-308.1.1.el5 set to be installed ---> Package kernel-headers.x86_64 0:2.6.18-308.1.1.el5 set to be updated ---> Package kpartx.x86_64 0:0.4.7-48.el5_8.1 set to be updated ---> Package krb5-devel.x86_64 0:1.6.1-70.el5 set to be updated ---> Package krb5-libs.x86_64 0:1.6.1-70.el5 set to be updated ---> Package krb5-workstation.x86_64 0:1.6.1-70.el5 set to be updated ---> Package ksh.x86_64 0:20100621-5.el5_8.1 set to be updated ---> Package kudzu.x86_64 0:1.2.57.1.26-3.el5.centos set to be updated ---> Package less.x86_64 0:436-9.el5 set to be updated ---> Package lftp.x86_64 0:3.7.11-7.el5 set to be updated ---> Package libX11.x86_64 0:1.0.3-11.el5_7.1 set to be updated ---> Package libX11-devel.x86_64 0:1.0.3-11.el5_7.1 set to be updated ---> Package libXcursor.x86_64 0:1.1.7-1.2 set to be updated ---> Package libacl.x86_64 0:2.2.39-8.el5 set to be updated ---> Package libgcc.x86_64 0:4.1.2-52.el5 set to be updated ---> Package libgomp.x86_64 0:4.4.6-3.el5.1 set to be updated ---> Package libpng.x86_64 2:1.2.10-16.el5_8 set to be updated ---> Package libpng-devel.x86_64 2:1.2.10-16.el5_8 set to be updated ---> Package libsmbios.x86_64 0:2.2.27-3.2.el5 set to be updated ---> Package libstdc++.x86_64 0:4.1.2-52.el5 set to be updated ---> Package libstdc++-devel.x86_64 0:4.1.2-52.el5 set to be updated ---> Package libsysfs.x86_64 0:2.1.0-1.el5 set to be updated ---> Package libusb.x86_64 0:0.1.12-6.el5 set to be updated ---> Package libvolume_id.x86_64 0:095-14.27.el5_7.1 set to be updated ---> Package libxml2.x86_64 0:2.6.26-2.1.15.el5_8.2 set to be updated ---> Package libxml2-python.x86_64 0:2.6.26-2.1.15.el5_8.2 set to be updated ---> Package logrotate.x86_64 0:3.7.4-12 set to be updated ---> Package lsof.x86_64 0:4.78-6 set to be updated ---> Package lvm2.x86_64 0:2.02.88-7.el5 set to be updated ---> Package m2crypto.x86_64 0:0.16-8.el5 set to be updated ---> Package man.x86_64 0:1.6d-2.el5 set to be updated ---> Package man-pages.noarch 0:2.39-20.el5 set to be updated ---> Package mcelog.x86_64 1:0.9pre-1.32.el5 set to be updated ---> Package mesa-libGL.x86_64 0:6.5.1-7.10.el5 set to be updated ---> Package mesa-libGL-devel.x86_64 0:6.5.1-7.10.el5 set to be updated ---> Package microcode_ctl.x86_64 2:1.17-1.56.el5 set to be updated ---> Package mkinitrd.x86_64 0:5.1.19.6-75.el5 set to be updated ---> Package mktemp.x86_64 3:1.5-24.el5 set to be updated --> Processing Dependency: nash = 5.1.19.6-68.el5_6.1 for package: mkinitrd ---> Package nash.x86_64 0:5.1.19.6-75.el5 set to be updated ---> Package net-snmp.x86_64 1:5.3.2.2-17.el5 set to be updated ---> Package net-snmp-devel.x86_64 1:5.3.2.2-17.el5 set to be updated ---> Package net-snmp-libs.x86_64 1:5.3.2.2-17.el5 set to be updated ---> Package net-snmp-utils.x86_64 1:5.3.2.2-17.el5 set to be updated ---> Package net-tools.x86_64 0:1.60-82.el5 set to be updated ---> Package nfs-utils.x86_64 1:1.0.9-60.el5 set to be updated ---> Package nfs-utils-lib.x86_64 0:1.0.8-7.9.el5 set to be updated ---> Package nscd.x86_64 0:2.5-81.el5_8.1 set to be updated ---> Package nspr.x86_64 0:4.8.9-1.el5_8 set to be updated ---> Package nspr-devel.x86_64 0:4.8.9-1.el5_8 set to be updated ---> Package nss.x86_64 0:3.13.1-5.el5_8 set to be updated ---> Package nss-devel.x86_64 0:3.13.1-5.el5_8 set to be updated ---> Package nss-tools.x86_64 0:3.13.1-5.el5_8 set to be updated ---> Package nss_ldap.x86_64 0:253-49.el5 set to be updated ---> Package ntp.x86_64 0:4.2.2p1-15.el5.centos.1 set to be updated ---> Package numactl.x86_64 0:0.9.8-12.el5_6 set to be updated ---> Package oddjob.x86_64 0:0.27-12.el5 set to be updated ---> Package oddjob-libs.x86_64 0:0.27-12.el5 set to be updated ---> Package openldap.x86_64 0:2.3.43-25.el5 set to be updated ---> Package openssh.x86_64 0:4.3p2-82.el5 set to be updated ---> Package openssh-clients.x86_64 0:4.3p2-82.el5 set to be updated ---> Package openssh-server.x86_64 0:4.3p2-82.el5 set to be updated ---> Package openssl.i686 0:0.9.8e-22.el5_8.1 set to be updated ---> Package openssl.x86_64 0:0.9.8e-22.el5_8.1 set to be updated ---> Package openssl-devel.x86_64 0:0.9.8e-22.el5_8.1 set to be updated ---> Package pam_krb5.x86_64 0:2.2.14-22.el5 set to be updated ---> Package pam_pkcs11.x86_64 0:0.5.3-26.el5 set to be updated ---> Package pango.x86_64 0:1.14.9-8.el5.centos.3 set to be updated ---> Package parted.x86_64 0:1.8.1-29.el5 set to be updated ---> Package pciutils.x86_64 0:3.1.7-5.el5 set to be updated ---> Package perl.x86_64 4:5.8.8-38.el5 set to be updated ---> Package perl-Compress-Raw-Bzip2.x86_64 0:2.037-1.el5.rf set to be updated ---> Package perl-Compress-Raw-Zlib.x86_64 0:2.037-1.el5.rf set to be updated ---> Package perl-rrdtool.x86_64 0:1.4.7-1.el5.rf set to be updated ---> Package poppler.x86_64 0:0.5.4-19.el5 set to be updated ---> Package poppler-utils.x86_64 0:0.5.4-19.el5 set to be updated ---> Package popt.x86_64 0:1.10.2.3-28.el5_8 set to be updated ---> Package postgresql-libs.x86_64 0:8.1.23-1.el5_7.3 set to be updated ---> Package procps.x86_64 0:3.2.7-18.el5 set to be updated ---> Package proftpd.x86_64 0:1.3.4a-1.el5.rf set to be updated --> Processing Dependency: perl(Mail::Sendmail) for package: proftpd ---> Package python.x86_64 0:2.4.3-46.el5 set to be updated ---> Package python-ctypes.x86_64 0:1.0.2-3.el5 set to be updated ---> Package python-libs.x86_64 0:2.4.3-46.el5 set to be updated ---> Package python-smbios.x86_64 0:2.2.27-3.2.el5 set to be updated ---> Package rhpl.x86_64 0:0.194.1-2 set to be updated ---> Package rmt.x86_64 0:0.4b41-6.el5 set to be updated ---> Package rng-utils.x86_64 1:2.0-5.el5 set to be updated ---> Package rpm.x86_64 0:4.4.2.3-28.el5_8 set to be updated ---> Package rpm-build.x86_64 0:4.4.2.3-28.el5_8 set to be updated ---> Package rpm-devel.x86_64 0:4.4.2.3-28.el5_8 set to be updated ---> Package rpm-libs.x86_64 0:4.4.2.3-28.el5_8 set to be updated ---> Package rpm-python.x86_64 0:4.4.2.3-28.el5_8 set to be updated ---> Package rrdtool.x86_64 0:1.4.7-1.el5.rf set to be updated ---> Package rsh.x86_64 0:0.17-40.el5_7.1 set to be updated ---> Package rsync.x86_64 0:3.0.6-4.el5_7.1 set to be updated ---> Package ruby.x86_64 0:1.8.5-24.el5 set to be updated ---> Package ruby-libs.x86_64 0:1.8.5-24.el5 set to be updated ---> Package sblim-sfcb.x86_64 0:1.3.11-49.el5 set to be updated ---> Package sblim-sfcc.x86_64 0:2.2.2-49.el5 set to be updated ---> Package selinux-policy.noarch 0:2.4.6-327.el5 set to be updated ---> Package selinux-policy-targeted.noarch 0:2.4.6-327.el5 set to be updated ---> Package setup.noarch 0:2.5.58-9.el5 set to be updated ---> Package shadow-utils.x86_64 2:4.0.17-20.el5 set to be updated ---> Package smartmontools.x86_64 1:5.38-3.el5 set to be updated ---> Package smbios-utils-bin.x86_64 0:2.2.27-3.2.el5 set to be updated ---> Package smbios-utils-python.x86_64 0:2.2.27-3.2.el5 set to be updated ---> Package sos.noarch 0:1.7-9.62.el5 set to be updated ---> Package srvadmin-omilcore.x86_64 0:6.5.0-1.452.1.el5 set to be updated ---> Package strace.x86_64 0:4.5.18-11.el5_8 set to be updated ---> Package subversion.x86_64 0:1.6.11-7.el5_6.4 set to be updated ---> Package sudo.x86_64 0:1.7.2p1-13.el5 set to be updated ---> Package sysfsutils.x86_64 0:2.1.0-1.el5 set to be updated ---> Package syslinux.x86_64 0:3.11-7 set to be updated ---> Package system-config-network-tui.noarch 0:1.3.99.21-1.el5 set to be updated ---> Package talk.x86_64 0:0.17-31.el5 set to be updated ---> Package tar.x86_64 2:1.15.1-31.el5 set to be updated ---> Package traceroute.x86_64 3:2.0.1-6.el5 set to be updated ---> Package tzdata.x86_64 0:2012b-3.el5 set to be updated ---> Package udev.x86_64 0:095-14.27.el5_7.1 set to be updated ---> Package util-linux.x86_64 0:2.13-0.59.el5 set to be updated ---> Package vixie-cron.x86_64 4:4.1-81.el5 set to be updated ---> Package wget.x86_64 0:1.11.4-3.el5_8.1 set to be updated ---> Package xinetd.x86_64 2:2.3.14-16.el5 set to be updated ---> Package yp-tools.x86_64 0:2.9-2.el5 set to be updated ---> Package ypbind.x86_64 3:1.19-12.el5_6.1 set to be updated ---> Package yum.noarch 0:3.2.22-39.el5.centos set to be updated ---> Package yum-dellsysid.x86_64 0:2.2.27-3.2.el5 set to be updated ---> Package yum-fastestmirror.noarch 0:1.1.16-21.el5.centos set to be updated ---> Package zlib.x86_64 0:1.2.3-4.el5 set to be updated ---> Package zlib-devel.x86_64 0:1.2.3-4.el5 set to be updated --> Running transaction check --> Processing Dependency: dbus = 1.1.2-15.el5_6 for package: dbus-libs --> Processing Dependency: nash = 5.1.19.6-68.el5_6.1 for package: mkinitrd ---> Package perl-Mail-Sendmail.noarch 0:0.79-1.2.el5.rf set to be updated base/filelists | 3.5 MB 00:00 dell-omsa-indep/filelists | 195 kB 00:01 dell-omsa-specific/filelists | 1.0 kB 00:00 extras/filelists_db | 224 kB 00:00 rpmforge/filelists | 4.8 MB 00:06 updates/filelists_db | 715 kB 00:00 --> Finished Dependency Resolution dbus-libs-1.1.2-15.el5_6.i386 from installed has depsolving problems --> Missing Dependency: dbus = 1.1.2-15.el5_6 is needed by package dbus-libs-1.1.2-15.el5_6.i386 (installed) mkinitrd-5.1.19.6-68.el5_6.1.i386 from installed has depsolving problems --> Missing Dependency: nash = 5.1.19.6-68.el5_6.1 is needed by package mkinitrd-5.1.19.6-68.el5_6.1.i386 (installed) Error: Missing Dependency: nash = 5.1.19.6-68.el5_6.1 is needed by package mkinitrd-5.1.19.6-68.el5_6.1.i386 (installed) Error: Missing Dependency: dbus = 1.1.2-15.el5_6 is needed by package dbus-libs-1.1.2-15.el5_6.i386 (installed) You could try using --skip-broken to work around the problem You could try running: package-cleanup --problems package-cleanup --dupes rpm -Va --nofiles --nodigest The program package-cleanup is found in the yum-utils package. I have tried running package-cleanup --dupes and package-cleanup --problems but to no avail.

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• TPROXY Not working with HAProxy, Ubuntu 14.04

  - by Nyxynyx

  I'm trying to use HAProxy as a fully transparent proxy using TPROXY in Ubuntu 14.04. HAProxy will be setup on the first server with eth1 111.111.250.250 and eth0 10.111.128.134. The single balanced server has eth1 and eth0 as well. eth1 is the public facing network interface while eth0 is for the private network which both servers are in. Problem: I'm able to connect to the balanced server's port 1234 directly (via eth1) but am not able to reach the balanced server via Haproxy port 1234 (which redirects to 1234 via eth0). Am I missing out something in this configuration? On the HAProxy server The current kernel is: Linux extremehash-lb2 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux The kernel appears to have TPROXY support: # grep TPROXY /boot/config-3.13.0-24-generic CONFIG_NETFILTER_XT_TARGET_TPROXY=m HAProxy was compiled with TPROXY support: haproxy -vv HA-Proxy version 1.5.3 2014/07/25 Copyright 2000-2014 Willy Tarreau <[email protected]> Build options : TARGET = linux26 CPU = x86_64 CC = gcc CFLAGS = -g -fno-strict-aliasing OPTIONS = USE_LINUX_TPROXY=1 USE_LIBCRYPT=1 USE_STATIC_PCRE=1 Default settings : maxconn = 2000, bufsize = 16384, maxrewrite = 8192, maxpollevents = 200 Encrypted password support via crypt(3): yes Built without zlib support (USE_ZLIB not set) Compression algorithms supported : identity Built without OpenSSL support (USE_OPENSSL not set) Built with PCRE version : 8.31 2012-07-06 PCRE library supports JIT : no (USE_PCRE_JIT not set) Built with transparent proxy support using: IP_TRANSPARENT IPV6_TRANSPARENT IP_FREEBIND Available polling systems : epoll : pref=300, test result OK poll : pref=200, test result OK select : pref=150, test result OK Total: 3 (3 usable), will use epoll. In /etc/haproxy/haproxy.cfg, I've configured a port to have the following options: listen test1235 :1234 mode tcp option tcplog balance leastconn source 0.0.0.0 usesrc clientip server balanced1 10.111.163.76:1234 check inter 5s rise 2 fall 4 weight 4 On the balanced server In /etc/networking/interfaces I've set the gateway for eth0 to be the HAProxy box 10.111.128.134 and restarted networking. auto eth0 eth1 iface eth0 inet static address 111.111.250.250 netmask 255.255.224.0 gateway 111.131.224.1 dns-nameservers 8.8.4.4 8.8.8.8 209.244.0.3 iface eth1 inet static address 10.111.163.76 netmask 255.255.0.0 gateway 10.111.128.134 ip route gives: default via 111.111.224.1 dev eth0 10.111.0.0/16 dev eth1 proto kernel scope link src 10.111.163.76 111.111.224.0/19 dev eth0 proto kernel scope link src 111.111.250.250

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• Need to increase nginx throughput to an upstream unix socket -- linux kernel tuning?

  - by Ben Lee

  I am running an nginx server that acts as a proxy to an upstream unix socket, like this: upstream app_server { server unix:/tmp/app.sock fail_timeout=0; } server { listen ###.###.###.###; server_name whatever.server; root /web/root; try_files $uri @app; location @app { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header Host $http_host; proxy_redirect off; proxy_pass http://app_server; } } Some app server processes, in turn, pull requests off /tmp/app.sock as they become available. The particular app server in use here is Unicorn, but I don't think that's relevant to this question. The issue is, it just seems that past a certain amount of load, nginx can't get requests through the socket at a fast enough rate. It doesn't matter how many app server processes I set up, it doesn't even matter what the app is (tried it with a dummy app with just a single endpoint that returned an empty page with status 404). The bottleneck seems to be the socket, not the app. I'm getting a flood of these messages in the nginx error log: connect() to unix:/tmp/app.sock failed (11: Resource temporarily unavailable) while connecting to upstream Many requests result in status code 502, and those that don't take a long time to complete. The nginx write queue stat hovers around 1000. Anyway, I feel like I'm missing something obvious here, because this particular configuration of nginx and app server is pretty common, especially with Unicorn (it's the recommended method in fact). Are there any linux kernel options that needs to be set, or something in nginx? Any ideas about how to increase the throughput to the upstream socket? Something that I'm clearly doing wrong? Additional information on the environment: $ uname -a Linux app1 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:52:17 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux $ ruby -v ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux] $ unicorn -v unicorn v4.3.1 $ nginx -V nginx version: nginx/1.2.1 built by gcc 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) TLS SNI support enabled Current kernel tweaks: net.core.rmem_default = 65536 net.core.wmem_default = 65536 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 65536 16777216 net.ipv4.tcp_mem = 16777216 16777216 16777216 net.ipv4.tcp_window_scaling = 1 net.ipv4.route.flush = 1 net.ipv4.tcp_no_metrics_save = 1 net.ipv4.tcp_moderate_rcvbuf = 1 net.core.somaxconn = 8192 net.netfilter.nf_conntrack_max = 131072

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• Supervisord appears to be running, but monitored programs aren't launched

  - by Brad Montgomery

  I've got supervisord 3.0a8 installed from the system package on ubuntu 10.04 (64bit). The supervisor service appears to be running, but it's not launching the configured programs. Interestingly enough, this exact configuration is running on another system, and is working as expected. The main config file looks like this: ; /etc/supervisor/supervisord.conf [unix_http_server] chmod=0700 file=/var/run/supervisor.sock [supervisord] logfile=/var/log/supervisor/supervisord.log childlogdir=/var/log/supervisor pidfile=/var/run/supervisord.pid [rpcinterface:supervisor] supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface [supervisorctl] serverurl=unix:///var/run/supervisor.sock [include] files = /etc/supervisor/conf.d/*.conf A sample program config looks like this: ; /etc/supervisor/conf.d/sample.conf [program:sample] directory=/opt/sample command=/opt/sample/run.sh Where, the /opt/sample/run.sh is: #!/bin/bash while true; do T=`date` echo "[$T] Running!" >> /var/log/sample.log sleep 1 done And, here's some additional information regarding the running instance of supervisord: root@myhost:~# supervisorctl version 3.0a8 root@myhost:~# which supervisorctl /usr/bin/supervisorctl root@myhost:~# which supervisord /usr/bin/supervisord root@myhost:~# supervisorctl status # NOTE that there's no output! root@myhost:~# supervisorctl avail root@myhost:~# service supervisor status is running root@myhost:~# ps aux | grep supervisor root 21740 0.1 0.4 40772 10056 ? Ss 11:28 0:00 /usr/bin/python /usr/bin/supervisord root 21749 0.0 0.0 7624 932 pts/2 S+ 11:28 0:00 grep --color=auto supervisor root@myhost:~# cat /var/log/supervisor/supervisord.log 2012-04-26 11:28:22,483 CRIT Supervisor running as root (no user in config file) 2012-04-26 11:28:22,536 INFO RPC interface 'supervisor' initialized 2012-04-26 11:28:22,536 WARN cElementTree not installed, using slower XML parser for XML-RPC 2012-04-26 11:28:22,536 CRIT Server 'unix_http_server' running without any HTTP authentication checking 2012-04-26 11:28:22,539 INFO daemonizing the supervisord process 2012-04-26 11:28:22,539 INFO supervisord started with pid 21740 root@myhost:~# ll /etc/supervisor/conf.d/ total 28 drwxr-xr-x 2 root root 4096 2012-04-26 11:31 ./ drwxr-xr-x 3 root root 4096 2012-04-25 18:38 ../ -rw-r--r-- 1 root root 66 2012-04-26 11:31 sample.conf root@myhost:~# ll /opt/sample/ total 12 drwxr-xr-x 2 root root 4096 2012-04-26 11:32 ./ drwxr-xr-x 4 root root 4096 2012-04-26 11:31 ../ -rwxr-xr-x 1 root root 97 2012-04-26 11:32 run.sh* root@myhost:~# python Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) [GCC 4.4.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> Any help is greatly appreciated!

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• How can I install things in Linux with *no yum* and *no wget*?

  - by e9t

  I'm a newbie to Linux (that mainly uses Windows and Mac OS X) needing some advice. I was trying to install git on a Linux machine today, and encountered some problems: Not knowing the version of the installed OS, I've opened the /proc/version file which said: Linux version 2.6.9-42.0.2.ELsmp ([email protected]) (gcc version 3.4.6 20060404 (Red Hat 3.4.6-3)) #1 SMP Thu Aug 17 17:57:31 EDT 2006 Then, as written in the git documents (http://git-scm.com/download/linux), I assumed I could use the yum install git command for Fedora, but got the following result. [root@myserver ~]# yum install git -bash: yum: command not found So I tried installing yum using wget, but wasn't so lucky. [root@myserver ~]# wget http://linux.duke.edu/projects/yum/download/2.0/yum-2.0.7.tar.gz -bash: wget: command not found I googled and found this page and this page, so tried installing yum with rpm, but only got a result full of question marks. (Possibly an encoding problem, hmm...) [root@myserver ~]# rpm -Uvh http://www.eomy.net/linux/install-yum-x86_64/wget-1.10.2-0.40E.x86_64.rpm http://www.eomy.net/linux/install-yum-x86_64/wget-1.10.2-0.40E.x86_64.rpm(??)?? ?????? ?: /var/tmp/rpm-xfer.TbuAOu: V3 DSA signature: NOKEY, key ID 443e1821 ???.. ########################################### [100%] wget-1.10.2-0.40E U???????g??????? wget-1.10.2-0.40E???? ??g??/usr/bin/wget ?? wget-1.10.2-0.40E U?????? ???? wget-1.10.2-0.40E???? ??g??/usr/share/man/man1/wget.1.gz ?? wget-1.10.2-0.40E U?????? ???? [root@myserver ~]# Finally, when I typed rpm --version in the terminal, I got the below results. [root@myserver ~]# rpm --version RPM ???? - 4.3.3 I would like to know what I can do or possibly try now. Is it not possible to wget or yum anything in my situation? Or is there any magical tool like homebrew (http://mxcl.github.com/homebrew/) that I can use? Any comments or advice would be appreciated. Thanks in advance!

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• Cannot install passenger with Nginx

  - by Luc

  Hello, I have a rack application that I want to migrate from Ruby 1.8.7 + Apache + passenger to Ruby 1.9.1 + Nginx + passenger. I have made up the following script for a quick install all in one, and it raises an error... Here is the installation script: (basic one with all the steps I need to install everything on a Ubuntu 10.04 Lucid Lynx fresh box) Nginx sources cd /tmp wget http://nginx.org/download/nginx-0.7.66.tar.gz tar xzf nginx-0.7.66.tar.gz cd nginx-0.7.66 openssl required for SSL/TLS sudo apt-get install openssl sudo apt-get install libssl-dev Compilation stuff sudo apt-get zlib1g-dev Ruby interpreter 1.9.1 sudo apt-get install ruby1.9.1 ruby1.9.1-dev rubygems1.9.1 irb1.9.1 ri1.9.1 rdoc1.9.1 build-essential nginx libopenssl-ruby1.9.1 Make sure default ruby uses version 1.9.1 sudo update-alternatives --install /usr/bin/ruby ruby /usr/bin/ruby1.9.1 400 --slave /usr/share/man/man1/ruby.1.gz ruby.1.gz /usr/share/man/man1/ruby1.9.1.1.gz --slave /usr/bin/ri ri /usr/bin/ri1.9.1 --slave /usr/bin/irb irb /usr/bin/irb1.9.1 --slave /usr/bin/rdoc rdoc /usr/bin/rdoc1.9.1 sudo update-alternatives --config ruby Passenger (rake-0.8.7, fastthread-1.0.7, rack-1.1.0, passenger-2.2.14) sudo gem install passenger Activate Passenger in nginx, select option 2 to use nginx sources donwloaded above cd /var/lib/gems/1.9.1/gems/passenger-2.2.14/bin sudo ./passenger-install-nginx-module And this is the error message I got: /var/lib/gems/1.9.1/gems/passenger-2.2.14/ext/nginx/ContentHandler.c gcc -c -pipe -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Wunused-function -Wunused-variable -Wunused-value -Werror -g -I src/core -I src/event -I src/event/modules -I src/os/unix -I /tmp/pcre-8.00 -I objs -I src/http -I src/http/modules -I src/mail \ -o objs/addon/nginx/StaticContentHandler.o \ /var/lib/gems/1.9.1/gems/passenger-2.2.14/ext/nginx/StaticContentHandler.c /var/lib/gems/1.9.1/gems/passenger-2.2.14/ext/nginx/StaticContentHandler.c: In function ‘passenger_static_content_handler’: /var/lib/gems/1.9.1/gems/passenger-2.2.14/ext/nginx/StaticContentHandler.c:71: error: ‘ngx_http_request_t’ has no member named ‘zero_in_uri’ make[1]: *** [objs/addon/nginx/StaticContentHandler.o] Error 1 make[1]: Leaving directory `/tmp/nginx-0.7.66' make: *** [build] Error 2 -------------------------------------------- It looks like something went wrong Please read our Users guide for troubleshooting tips: /var/lib/gems/1.9.1/gems/passenger-2.2.14/doc/Users guide Nginx.html I do not understand the reason of this error. Is this a compatibility problem ? Hope you have any clues :) Thanks a lot, Luc

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• Access denied to mysql cause by invalid server hostname bind address

  - by Mark

  I cannot login to mysql using the terminal. [root@fst mysql]# mysql -h localhost -u admin -p Enter password: ERROR 1045 (28000): Access denied for user 'admin'@'localhost' (using password: YES) I am sure I have the correct password. The mysql is also running when I check status. The mysql database is also present in the directory /var/lib/mysql/. The host host.myi, host.myd and host.frm are present. By the way this a related to question on my previous problem MySQL server quit without updating PID file . Initially the problem arise when the root directory was full. To be able to login to directadmin and start mysql, I added a soft link of the /var/lib/mysql/ to /home/mysql. Since my database used up the most of the root directory. The root directory has 50Gb and /home has 1.5Gb. Somehow the /var/lib/mysql/idbdata1 is corrupted. So I move it to another location. Now, I can start the mysql server but I cannot login into it. Below are the contents from the myql logs. 121212 20:44:10 mysqld_safe mysqld from pid file /var/lib/mysql/fst.srv.net.pid ended 121212 20:44:10 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 121212 20:44:10 [Note] Plugin 'FEDERATED' is disabled. 121212 20:44:10 InnoDB: The InnoDB memory heap is disabled 121212 20:44:10 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121212 20:44:10 InnoDB: Compressed tables use zlib 1.2.3 121212 20:44:10 InnoDB: Using Linux native AIO 121212 20:44:10 InnoDB: Initializing buffer pool, size = 128.0M 121212 20:44:10 InnoDB: Completed initialization of buffer pool 121212 20:44:10 InnoDB: highest supported file format is Barracuda. 121212 20:44:11 InnoDB: Waiting for the background threads to start 121212 20:44:12 InnoDB: 1.1.8 started; log sequence number 1595675 121212 20:44:12 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306 121212 20:44:12 [Note] - '0.0.0.0' resolves to '0.0.0.0'; 121212 20:44:12 [Note] Server socket created on IP: '0.0.0.0'. 121212 20:44:12 [Note] Event Scheduler: Loaded 0 events 121212 20:44:12 [Note] /usr/sbin/mysqld: ready for connections. Version: '5.5.27-log' socket: '/var/lib/mysql/mysql.sock' port: 3306 MySQL Community Server (GPL) I guess there is something wrong with the bind address. How should I fix the problem?

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• Server freezes at XX:25

  - by Karevan

  We've ordered a 50 euro/month server on hetzner.de, it has debian OS. The problem is that server is freezing in random time of the day and nothing appears in log. Only hardware reboot helps. Part of the log file while it was freezing: Aug 17 22:38:26 Debian-60-squeeze-64-minimal pure-ftpd: ([email protected]) [INFO] New connection from 95.211.120.220 Aug 17 22:38:26 Debian-60-squeeze-64-minimal pure-ftpd: ([email protected]) [INFO] Logout. Aug 17 22:39:01 Debian-60-squeeze-64-minimal /USR/SBIN/CRON[22828]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type$ Aug 17 23:09:01 Debian-60-squeeze-64-minimal /USR/SBIN/CRON[22835]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type$ Aug 17 23:17:01 Debian-60-squeeze-64-minimal /USR/SBIN/CRON[22842]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Aug 17 23:39:01 Debian-60-squeeze-64-minimal /USR/SBIN/CRON[22847]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type$ Aug 18 09:47:47 Debian-60-squeeze-64-minimal kernel: imklog 4.6.4, log source = /proc/kmsg started. Aug 18 09:47:47 Debian-60-squeeze-64-minimal rsyslogd: [origin software="rsyslogd" swVersion="4.6.4" x-pid="1229" x-info="http://www.rsyslog.com"] (re)start Aug 18 09:47:47 Debian-60-squeeze-64-minimal kernel: [ 0.000000] Initializing cgroup subsys cpuset Aug 18 09:47:47 Debian-60-squeeze-64-minimal kernel: [ 0.000000] Initializing cgroup subsys cpu Aug 18 09:47:47 Debian-60-squeeze-64-minimal kernel: [ 0.000000] Linux version 2.6.32-5-amd64 (Debian 2.6.32-45) ([email protected]) (gcc version 4.3.5 (Debian 4.3.5$ Aug 18 09:47:47 Debian-60-squeeze-64-minimal kernel: [ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-2.6.32-5-amd64 root=/dev/md2 ro As you can see, it appears only the fact of starting. No. theres no way to look in server's console right after when it freezes, sadly. Datacenter supporters do not really want to help about that. Server has been installed 30th july, times and dates of freezes are down there: 6 august, 0:25 18 august, 2:27 21 august, 1:25 26 august, 23:26. We decided that freezing around ??:25 isn't a hardware fault, and decided to reinstall the OS. Later, 31 august, our admin backed up all files, reinstalled Debian, and restored the backup. But then, 7 september, server went down again, at 5:05. We thought it was related to Anyone else experiencing high rates of Linux server crashes during a leap second day? and turned ntp off. But then the server went down twice again, 21 september, 17:29 and 24 september, 20:27. I called all linux admins I knew to help with solving it and they said everything is fine about configuring OS and it could be hardware only. But they dont know why it always freezes at XX:25-30. Maybe some of you know about something related to that?

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• How to move a ruby on rails application to a new server

  - by ManiacZX

  I have a rails app on an old Ubuntu server I need to move onto a new machine. I haven't worked with ruby on rails so I don't really know anything about the structure of the app. I want to load this onto an Ubuntu 8.04 AMI on Amazon EC2 and am looking for any information regarding the migration process such as: Do I copy over the entire folder defined as the application root in the mongrel config (for ex: /u/apps/myapp/current) or just certain folders? Am I looking for trouble if I go with the latest versions of ruby and the various gems? Any general gotchas to look out for in the process. Current server information: root@webnode001:/# cat /proc/version Linux version 2.6.15-27-server (buildd@terranova) (gcc version 4.0.3 (Ubuntu 4.0.3-1ubuntu5)) #1 SMP Fri Dec 8 18:43:54 UTC 2006 root@webnode001:/# rails -v Rails 1.2.3 root@webnode001:/# mongrel_rails cluster::configure --version Version 1.0.1 root@webnode001:/# gem -v 0.9.0 root@webnode001:/# gem list -l *** LOCAL GEMS *** actionmailer (1.3.3, 1.2.5) Service layer for easy email delivery and testing. actionpack (1.13.3, 1.12.5) Web-flow and rendering framework putting the VC in MVC. actionwebservice (1.2.3, 1.1.6) Web service support for Action Pack. activerecord (1.15.3, 1.15.2, 1.14.4) Implements the ActiveRecord pattern for ORM. activesupport (1.4.2, 1.4.1, 1.3.1) Support and utility classes used by the Rails framework. cgi_multipart_eof_fix (2.1) Fix an exploitable bug in CGI multipart parsing which affects Ruby <= 1.8.5 when multipart boundary attribute contains a non-halting regular expression string. daemons (1.0.7, 1.0.5, 1.0.4, 1.0.2) A toolkit to create and control daemons in different ways eventmachine (0.7.2, 0.7.0) Ruby/EventMachine socket engine library fastercsv (1.2.0, 1.1.0) FasterCSV is CSV, but faster, smaller, and cleaner. fastthread (1.0) Optimized replacement for thread.rb primitives ferret (0.11.4) Ruby indexing library. gem_plugin (0.2.2, 0.2.1) A plugin system based only on rubygems that uses dependencies only mongrel (1.0.1, 0.3.13.4) A small fast HTTP library and server that runs Rails, Camping, Nitro and Iowa apps. mongrel_cluster (0.2.1) Mongrel plugin that provides commands and Capistrano tasks for managing multiple Mongrel processes. mysql (2.7) MySQL/Ruby provides the same functions for Ruby programs that the MySQL C API provides for C programs. piston (1.3.3) Piston is a utility that enables merge tracking of remote repositories. rails (1.2.3, 1.1.6) Web-application framework with template engine, control-flow layer, and ORM. rake (0.7.3, 0.7.1) Ruby based make-like utility. sources (0.0.1) This package provides download sources for remote gem installation swiftiply (0.5.1) A fast clustering proxy for web applications.

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• Mounting a drive in Ubuntu 9.10 (Karmic Koala)

  - by morpheous

  I have just installed Ubuntu on a machine that previously had XP installed on it. The machine has 2 HDD (hard disk drives). I opted to install Ubuntu completely over XP. I am new to Linux, and I am still learning how to navigate teh file structure. However, AFAICT), there is only one drive. I want to be able to store programs etc on the first drive, and store data (program output etc) on the second drive. It appears Ubuntu is not aware that I have 2 drives (on XP, these were drives C and D). How can I mount the second drive (ideally, I want to do this automatically on login, so that the drive is available to me whenever I login - withou manual intervention from me) In XP, I could refer to files on a specific drive by prefixing with the drive letter (e.g. c:\foobar.cpp and d:\foobar.dat). I suspect the notation on ubuntu is different. How may I specify specific files on different drives? Last but notbthe least (a bit unrelated to previous questions). This relates to direcory structure again. I am a developer (C++ for desktops and PHP for websites), I want to install the following apps/ libraries. i). Apache 2.2 ii). PHP 5.2.11 iii). MySQL (5.1) iv). SVN v). Netbeans vi). C++ development tools (gcc, gdb, emacs etc) vii). QT toolkit viii). Some miscellaeous scientific software (e.g. www.r-project.org, www.gnu.org/software/octave/) I would be grateful if a someone can recommend a directory layout for these applications. Regarding development, I would also be grateful if someone could point out where to store my project and source files i.e: (i) *.cpp, *.hpp, *.mak files for cpp projects (ii) individual websites On my XP machine the layout for C++ dev was like this: c:\dev\devtools (common libs and headers etc) c:\dev\workarea (root folder for projects) c:\dev\workarea\c++ (c++ projects) c:\dev\workarea\websites (web projects) I would like to create a similar folder structure on the linux machine, but its not clear whether to place these folders under /, /usr, /home or swomewhere else (there seems to be abffling number of choices, so I want to get it "right" first time - i.e having a directory structure that most developer use, so it is easier when communicating with other ubuntu/linux developers)

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• mysql: job failded to start. mysqld.sock is missing

  - by Freefri

  How can I fix this and start mysql-server? After /etc/init.d/mysql start or service mysql start I get the message start: "Job failed to start" And after # mysqld I get this: mysqld 121123 11:33:33 [ERROR] Can't find messagefile '/usr/share/mysql/errmsg.sys' 121123 11:33:33 [Note] Plugin 'FEDERATED' is disabled. mysqld: Unknown error 1146 121123 11:33:33 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 121123 11:33:33 InnoDB: The InnoDB memory heap is disabled 121123 11:33:33 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121123 11:33:33 InnoDB: Compressed tables use zlib 1.2.3.4 121123 11:33:33 InnoDB: Initializing buffer pool, size = 128.0M 121123 11:33:33 InnoDB: Completed initialization of buffer pool 121123 11:33:33 InnoDB: highest supported file format is Barracuda. 121123 11:33:33 InnoDB: Waiting for the background threads to start 121123 11:33:34 InnoDB: 1.1.8 started; log sequence number 1595675 121123 11:33:34 [ERROR] Aborting 121123 11:33:34 InnoDB: Starting shutdown... 121123 11:33:35 InnoDB: Shutdown completed; log sequence number 1595675 121123 11:33:35 [Note] I try to do what mysql say me to do: mysql_upgrade Looking for 'mysql' as: mysql Looking for 'mysqlcheck' as: mysqlcheck Running 'mysqlcheck' with connection arguments: '--port=3306' '--socket=/var/run/mysqld/mysqld.sock' mysqlcheck: Got error: 2002: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) when trying to connect FATAL ERROR: Upgrade failed And yes, /var/run/mysql is empty: mysql_upgrade Looking for 'mysql' as: mysql Looking for 'mysqlcheck' as: mysqlcheck Running 'mysqlcheck' with connection arguments: '--port=3306' '--socket=/var/run/mysqld/mysqld.sock' mysqlcheck: Got error: 2002: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) when trying to connect FATAL ERROR: Upgrade failed And this is my file /etc/mysql/my.cnf # cat /etc/mysql/my.cnf |grep sock # Remember to edit /etc/mysql/debian.cnf when changing the socket location. socket = /var/run/mysqld/mysqld.sock socket = /var/run/mysqld/mysqld.sock socket = /var/run/mysqld/mysqld.sock Then I try to reinstall mysql from cero: apt-get purge mysql-client mysql-common mysql-server rm -R /var/lib/mysql rm -R /etc/mysql rm -R /var/run/mysqld userdel mysql apt-get install mysql-server mysql-client Then, after typing my root password for mysql I get this error: | Unable to set password for the MySQL "root" user ¦ ¦ ¦ ¦ An error occurred while setting the password for the MySQL administrative ¦ ¦ user. This may have happened because the account already has a password, or ¦ ¦ because of a communication problem with the MySQL server. ¦ ¦ ¦ ¦ You should check the account's password after the package installation. ¦ ¦ ¦ ¦ Please read the /usr/share/doc/mysql-server-5.5/README.Debian file for more ¦ ¦ information. And again I can't start mysql getting the same messages.

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