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• exim4 seem to stop listening

  - by trakos

  Hey, I have a strange problem with my exim4 configuration. I have a dedicated server running debian for quite a long time now, but I'm not really using it actively recently, so everything just worked due to lack of changes ;) However, recently, my exim4 smtp stopped answering on port 25. It does not respond through localhost, as well - even though it's set to listen on any interface available. Some things I've checked: ks:/home/trakos/Maildir/new# netstat -ap | grep exim tcp 0 0 *:smtp : LISTEN 12521/exim4 ks:/home/trakos/Maildir/new# exiwhat 12521 daemon: -q30s, listening for SMTP on port 25 (IPv4) ks:/home/trakos/Maildir/new# cat /var/log/exim4/rejectlog ks:/home/trakos/Maildir/new# cat /var/log/exim4/paniclog The queue is set for 30s only because I was running it in a non-daemon mode to see any output. Strangely enough, no suspicious output is given, netstat even shows it is listening on port 25, but still trying to telnet to it times out. The only things that may have changed recently are: I've got second IP for my server I remember that few days ago my spamassasin crashed, and I've started it up again So yeah, I'm really clueless about this one now :P I mean, I don't even know what could be failing here. Could someone give me some ideas what should I check next? PS: it has uptime of 442 days, so I haven't really tried rebooting it yet ^^

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• What may the reason of slowness be (see details in message body)?

  - by Ivan

  I've got a really weird situation I'm beating to solve. A performance problem which looks really like an empty waiting sequence set in code (while it probably isn't so). I've got a pretty powerful dedicated server (10 GB RAM, eight Xeon cores, etc) running Ubuntu 10.04 with all the functionality services (except OpenVPN server used to provide secure access to clients) deployed in separate VirtualBox (vboxheadless) machines (one for the company e-mail server, one for web server and one for accounting/crm server (Firebird + proprietary app server working with Delphi-made clients)). CPU load (as "top" says) is almost always near zero. Host system RAM is close to 100% usage but not overloaded (as very little swapping gets used, and freed (by stopping one of VMs) memory doesn't get reused any quickly). Approximately 50% of guests RAM is used. iostat usually shows near zero %util. Network bandwidth seems to be underused. But the accounting/crm client (a Win32 Delphi application run on WinXP machines) software works hell-slow with this server (and works much better using an inside-LAN Windows server). I just can't imagine what can make it be slow if there are so plenty of CPU, RAM, HDD and bandwidth resources available on clients and on the server even in their hardest moments. Saying bandwidth is underused I not only know that clients and the server are connected to the Internet with a bigger channels than really used (which leaves the a chance they may have a bottleneck of a sort on the route between them), I've tested bandwidth between clients and the server by copying files among them.

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• Servers - Buying New vs Buying Second-hand

  - by Django Reinhardt

  We're currently in the process of adding additional servers to our website. We have a pretty simple topology planned: A Firewall/Router Server infront of a Web Application Server and Database Server. Here's a simple (and technically incorrect) diagram that I used in a previous question to illustrate what I mean: We're now wondering about the specs of our two new machines (the Web App and Firewall servers) and whether we can get away with buying a couple of old servers. (Note: Both machines will be running Windows Server 2008 R2.) We're not too concerned about our Firewall/Router server as we're pretty sure it won't be taxed too heavily, but we are interested in our Web App server. I realise that answering this type of question is really difficult without a ton of specifics on users, bandwidth, concurrent sessions, etc, etc., so I just want to focus on the general wisdom on buying old versus new. I had originally specced a new Dell PowerEdge R300 (1U Rack) for our company. In short, because we're going to be caching as much data as possible, I focussed on Processor Speed and Memory: Quad-Core Intel Xeon X3323 2.5Ghz (2x3M Cache) 1333Mhz FSB 16GB DDR2 667Mhz But when I was looking for a cheap second-hand machine for our Firewall/Router, I came across several machines that made our engineer ask a very reasonable question: If we stuck a boat load of RAM in this thing, wouldn't it do for the Web App Server and save us a ton of money in the process? For example, what about a second-hand machine with the following specs: 2x Dual-Core AMD Opteron 2218 2.6Ghz (2MB Cache) 1000Mhz HT 16GB DDR2 667Mhz Would it really be comparable with the more expensive (new) server above? Our engineer postulated that the reason companies upgrade their servers to newer processors is often because they want to reduce their power costs, and that a 2.6Ghz processor was still a 2.6Ghz processor, no matter when it was made. Benchmarks on various sites don't really support this theory, but I was wondering what server admin thought. Thanks for any advice.

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• Should I buy more RAM for my computer or a better CPU?

  - by Reijer The Coder

  I have recently bought a new laptop, an ASUS N56VJ-S4149H. I bought it to use it in all possible ways I could want, so that would be gaming downloading and streaming movies browsing the web and programming software. So far it has been running great but one thing annoys me a little bit. I frequently play Mount&Blade: Warband, it's a great game and you should check it out. Everything runs smoothly but only when I turn down the 'Texture Detail'. Otherwise it will lag a lot and I can't really play. Now my question is: Is this a problem of not enough RAM? At first I was really sure it was but after thinking about for a while I'm not anymore. My computer only has 4 Gigabytes of RAM and there is still a slot open. So will it improve when I buy another 8 Gigabytes? EDIT: It has an Nvidia GeForce GT 635M inside. and an Intel Core i5 3230M CPU with 2,6 GHz. Help and answers are really appreciated. Thanks to all.

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• Windows 7 host with Ubuntu Guest and a performance hit, memory locks?

  - by Cyrylski

  I have a brand new Lenovo T510 with Core i5 and 4GB of RAM with Windows 7 on it. I Installed Ubuntu 10.10 in a Virtualbox. For some reason system gets really slow on this setup which makes me really angry. There's a video card shared with full 3D support enabled and 1GB of RAM allocated for the Ubuntu machine. It may sound stupid, but WHY is the whole memory consumed in an instant when I run Virtualbox? I struggled for like 10 minutes restraining myself from a brutal reset, and now everything runs smooth but memory "in use" in Resource Monitor is 3GB flat with only Chrome running. I'm new to Windows 7, but I'm really disappointed with performance at this point... I used to work in a different environment with much slower hardware and there was no such problem (WinXP over Ubuntu, 1GB out of 2GB allocated for WinXP guest on intel GMA). This is, until I clogged RAM totally there. But I was capable of running Chrome, Firefox and Apache server on a 1GB RAM in Ubuntu there and Photoshop CS4 on Windows XP and it worked. In this case I can't go beyond setting up Ubuntu properly. I bet I'm doing something wrong.

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• Linux SFTP and many local user accounts, limits with mount --bind?

  - by user123428

  I am in the process of building a solution to handle many developers (possibly hundreds) to work on their files via sftp, each one Jailed in their home directory. For our particular needs, we have a samba mount point that contains all of the users home directories. I have started developing the following solution and hit some walls: - I have configured a Ubuntu Lucid Server as sftp server. - In order to jail the user in their home directory (without allowing them the browse a directory up and seeing all the other users folders) I am using mount --bind and not a symbolic link (also some ftp clients don't really work with sym links). - The user accounts are local unix user accounts on the sftp server (not using a directory service or anything) that have an empty home folder created on the local machine, then I use mount --bind to bind the empty folder to the actual users home directory on the samba share. With this solution I am hitting a couple of problems, in the case of a server reboot, all the mount --binds are lost because they are not written in fstab. Then I have read somewhere that the maximum amount of entries in fstab are 400 (which does not really help us). I have thought of a solution of writing something that stores the mounts in a text file as a backup and on server reboot, run the script that re mounts. I am just really unsure about this whole process and was wondering if anyone has any insight on possibly a better solution for SFTP? (not FTP)

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• Can I use squid (or anything) to do this?

  - by user269334

  I have a really crappy VPS, and a really good computer at my office (with a really good internet connection), but behind a NAT. Is it possible to expose my good computer by doing this: 1. The good computer connects to the VPS (and keeps the connection alive) 2. The users connects to the VPS, and sends http(s) requests to the VPS. 3. The VPS just passes that http(s) requests to the good computer (including some identifications, so the servers can distinguish connections) 4. The good computer passes that http(s) response to the VPS 5. In turn, the VPS receives the http(s) response, and passes back to the client. Is it possible to do this? (btw, the VPS and the good computer are located in different countries) And also, is this "reverse proxy"? I heard that reverse proxy is for protecting the internal network by putting a middle server. And will this affect SSL configurations? (or make SSL impossible?) I'm intending to run nginx on the good computer. Thanks in advance : )

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• File gone or altered after MySQL[HY000][2002] error [on hold]

  - by Psyberion

  I'm working on a rather small project, and today I got an SQLSTATE[HY000][2002]:Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' error. After a bit of googling and a few attempts to restart the mysqld service, I gave up and tried rebooting the computer. This did the trick, MySQL was now running fine. I did, however, get a more serious issue: Some files were missing, others were altered. Also, a few posts in the MySQL was gone. It's really strange, it's like the whole project has been reset two or three days, and I have no clue why. Some additional details about this: I save my files after every line of code. I'm religious about this. So I haven't lost the files that way. I was accessing the server via SSH when the error occurred, so I did the programming and the reboot over SSH. The server is a Raspberry Pi, model B, with Raspian on which I run Apache2. I was viewing the site and had an active session when I rebooted the system. The pages I lost did work just before this all happened. The MySQL fault occurred when I tried to add a text NOT NULL column to a table which had entries. Now, the amount of lost work isn't really that much, so I'm not really looking for help recovering the files. The reason I'm posting this is because I wonder how did this happen, and why?

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• Open File Dialog MVVM

  - by Jose

  Ok I really would like to know how expert MVVM developers handle an openfile dialog in WPF. I don't really want to do this in my ViewModel(where 'Browse' is referenced via a DelegateCommand) void Browse(object param) { //Add code here OpenFileDialog d = new OpenFileDialog(); if (d.ShowDialog() == true) { //Do stuff } } Because I believe that goes against MVVM methodology. What do I do?

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• C#, how to add two large numbers (up to 100000 digits)

  - by user300484

  Hello! I want to add two really large numbers (up to 100000 digits each ). I know that I have to store string values in an array but I dont really know the procedure or the algorithm. Can you please help me there? Thank you!

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• How Drupal works?

  - by alice

  I have yet to see a comprehensive overview about how Drupal really works. Most of the tutorials are about lame things, like adding a module or configuring a site. Where is a flowchart about how the page gets generated? Most of the documentation is clumsy too. What's the best resource for learning how Drupal really works?

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• Facebook API call with email to return UID

  - by Jackson

  I'm trying to do a simple API call with facebook, with a user-given email to return their uid. Do I really need to auth them before this call is made? Thanks! :) I'm not doing anything else with the UID besides displaying to the user, which is why I don't really think it's worth authenticating them.

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• Eclipse vs Netbeans Web Service Tooling

  - by Zenzen

  Some time ago (~4-5months ago) I attented a lecture about JEE and at some point the lecturer started talking about webservices and how hard it is to create a good one because all the IDEs make them in a bit different way (or something like that) and that in general it's better to use Netbeans to create them as Eclipse has some issues, the thing is he didn't really say why Eclipse is bad. Now I'm wondering is what he said true and why, is it really better to use Netbeans for webservices and why?

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• When to use abstract classes?

  - by bala3569

  Here is the msdn article on abstract class but i really dont get it... When should i really use abstract classes? What are the advantages of using abstract classes?

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• [C++] Index strings by other strings

  - by mcco

  Hello, I need to index specific strings with other strings and I can't really find a good way to do so. I tried to use tr1::unordered_map, but I'm having some difficulties using it. If someone could tell me what is the best way to do that I'd be really grateful :) I also need to index objects by a number (numbers are not in order so I can't use a vector)

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• c++ FFT Beat detection library?

  - by mokaschitta

  Hi, I am currently looking around for a good allround beat detection library / source code in C++ since I found it really hard to achieve satisfying results with the beat detection code I wrote myself using this tutorial: http://www.gamedev.net/reference/programming/features/beatdetection/ It's especially really hard if you want to make it work with any kind of music so I was wondering if there is something usable out there allready? Thanks!

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• Unity framework - creating & disposing Entity Framework datacontexts at the appropriate time

  - by TobyEvans

  Hi there, With some kindly help from StackOverflow, I've got Unity Framework to create my chained dependencies, including an Entity Framework datacontext object: using (IUnityContainer container = new UnityContainer()) { container.RegisterType<IMeterView, Meter>(); container.RegisterType<IUnitOfWork, CommunergySQLiteEntities>(new ContainerControlledLifetimeManager()); container.RegisterType<IRepositoryFactory, SQLiteRepositoryFactory>(); container.RegisterType<IRepositoryFactory, WCFRepositoryFactory>("Uploader"); container.Configure<InjectedMembers>() .ConfigureInjectionFor<CommunergySQLiteEntities>( new InjectionConstructor(connectionString)); MeterPresenter meterPresenter = container.Resolve<MeterPresenter>(); this works really well in creating my Presenter object and displaying the related view, I'm really pleased. However, the problem I'm running into now is over the timing of the creation and disposal of the Entity Framework object (and I suspect this will go for any IDisposable object). Using Unity like this, the SQL EF object "CommunergySQLiteEntities" is created straight away, as I've added it to the constructor of the MeterPresenter public MeterPresenter(IMeterView view, IUnitOfWork unitOfWork, IRepositoryFactory cacheRepository) { this.mView = view; this.unitOfWork = unitOfWork; this.cacheRepository = cacheRepository; this.Initialize(); } I felt a bit uneasy about this at the time, as I don't want to be holding open a database connection, but I couldn't see any other way using the Unity dependency injection. Sure enough, when I actually try to use the datacontext, I get this error: ((System.Data.Objects.ObjectContext)(unitOfWork)).Connection '((System.Data.Objects.ObjectContext)(unitOfWork)).Connection' threw an exception of type 'System.ObjectDisposedException' System.Data.Common.DbConnection {System.ObjectDisposedException} My understanding of the principle of IoC is that you set up all your dependencies at the top, resolve your object and away you go. However, in this case, some of the child objects, eg the datacontext, don't need to be initialised at the time the parent Presenter object is created (as you would by passing them in the constructor), but the Presenter does need to know about what type to use for IUnitOfWork when it wants to talk to the database. Ideally, I want something like this inside my resolved Presenter: using(IUnitOfWork unitOfWork = new NewInstanceInjectedUnitOfWorkType()) { //do unitOfWork stuff } so the Presenter knows what IUnitOfWork implementation to use to create and dispose of straight away, preferably from the original RegisterType call. Do I have to put another Unity container inside my Presenter, at the risk of creating a new dependency? This is probably really obvious to a IoC guru, but I'd really appreciate a pointer in the right direction thanks Toby

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• [Silverlight] DataGrid

  - by nCdy

  I'm making tutorials. Silverlight + MSSQL And I'm on the last step when it says "Copy-paste my code and tada it will works"... :-/ But after I added System.Windows.Controls.Data reference it still can't find Error 3 The type or namespace name 'Data' does not exist in the namespace 'System.Windows.Controls' (are you missing an assembly reference?) I really don't miss the reference ... Maybe I need to add it somehow else or ... I really have no idea. (VSWDEE2010)

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• Receiving data with Winsock

  - by Tamir

  Right now, I'm programming the networking for my online game, and I'm not really sure what to do about receiving data. The problem is that I can't really guess the packet's size, so I thought of reading just 4 bytes from the packet and converting them to an int to know what's the packet's size. Then I'll just create a buffer in that size and receive the rest of the packet, is that a good idea? For your information, I'm using non-blocking i/o.

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• Need help with GP 10.0 and SQL Server 2000 in XP Service pack2 OS

  - by Rahul khanna

  Hi all, I am not able to install GP 10.0 in my system, pls somebody help me with the steps how can i install GP 10.0 in my system. I have windows XP service pack 2 OS. Going to work with GP 10.0 with SQL 2000 Database. I will be really appreciate if somebody help me with installation steps of GP 10.0 and SQL 2000. I am really fed up with installing GP 10.0 and SQL 2000. Pls help me... Thanks, Rahul

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• How do I debug an MPI program?

  - by Jay Conrod

  I have an MPI program which compiles and runs, but I would like to step through it to make sure nothing bizarre is happening. Ideally, I would like a simple way to attach GDB to any particular process, but I'm not really sure whether that's possible or how to do it. An alternative would be having each process write debug output to a separate log file, but this doesn't really give the same freedom as a debugger. Are there better approaches? How do you debug MPI programs?

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• How can I compile an iPhone App with Flash CS5 without a Developer License

  - by manderson12

  I understand Flash CS5 isn't the best way to make an app, but I'd really like to test out the apps I've made with it on my iPhone. Has anyone come up with a way to modify Flash CS5 so it doesn't require a Developer Certificate or Provisioning Profile (like the way you would modify Xcode so you can compile apps without paying $99 for the developer program)? I'd really appreciate it if anyone could provide some help. Thanks in advance.

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• What's a good Wiki that works on Google App Engine

  - by GrantJ

  Hi, I'm interested in using Google App Engine to host a wiki. I've already seen the question here: http://stackoverflow.com/questions/478760/what-cms-runs-on-google-app-engine about what's a good cms. That's really too broad for me. On my LAMP server I run dokuwiki and I'd really like something akin for the GAppEngine. Anyone know of something already developed or in development? Thanks, Grant

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• Pro JavaScript programmer interview questions

  - by WooYek

  What are good questions to determine applicant is really a pro JavaScript developer? Questions that can distinguish if someone is not an ad-hoc JavaScript programmer, but is really doing professional JavaScript development, object-oriented, reusable, and maintainable.

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• Templates - Exercises

  - by atch

  Hi, As I mentioned in my yesterday's post, I'm trying to teach myself templates from the book: Templates: The Complete Guide. And although I'm finding this book very nicely presented and material there is explained really well there are no exercises attached after each chapter to test your knowlege, like it is in The C++ Language by B.S for example and had done all exercises from "The C++" I really feel benefit from doing them. So what I'm asking today is: Does anyone know where can I get excersises with templates. Thank you.

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