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  • Redirect to a web server depending on location with nginx

    - by fceruti
    Im working on a web site that has to be reachable from many countries under the same domain. Id like to know how can I receive a request with nginx (or any other static file server), and send it to different web servers depending on IP's location. I mean, what is the point on having multiple db machines on country A and B, if the server that serves you the page is chosen by round robin. Maybe theres another solution to my problem, and I would be very happy if someone can explain it to me.

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  • How to rsync a large file, with as little CPU and bandwidth expense as possible?

    - by Johan Allgoth
    I have a 500 GB file that I plan on backing up remotely. The file changes often. I'll be rsyncing it from a desktop to a server. Both can run rsync client or server. What is the proper command for this? The ones I've tried sofar has been taking forever or simply acted strange. Example and results: rsync -cv --partial --inplace --no-whole-file /desktop/file1 myserver.com::module/file1 Seems to work, but only if I do it twice (?!). Also, slow. Does the above command do the checksumming on both computers, or only on the sending one? Is it correct otherwise?

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  • Stateful beans and Stateless beans in Spring context

    - by umesh awasthi
    Hi All, i am reading spring through its official documentation and at one place i came to a line that use prototype scope for for all statefull beans while singleton for stateless beans. i know there is something as statefull as well stateless beans in EJB but this is not what they have mentioned in the documents. Can any one explain me what exact this means of statefull as well stateless beans in Spring Thanks in advance

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  • SVN command that returns wether a user has a valid login for a repository?

    - by Zárate
    Hi there, I'm trying to find out an SVN command that would return some kind of true / false value depending on wether the user running it has access to a given repository. I'm building a tool for automated deployment and part of the process is checking out the code from the SVN repository. I'd like to find out if the user running the tool has a valid login already. If there's no valid login, just show a message and exit the tool (handling the SVN login internally is not an option at the moment). Plan B would be parsing the file in svn.simple looking for the repo URL, but thought about asking first. Thanks, Juan

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  • macro function for printing

    - by seven
    Hi, if for example i have : define PRINT(x) fprintf(stderr, x); and in code i append it : PRINT(("print this")) output is : [print this] if i append it : PRINT(("print %s", "this")) output is : [this] could someone explain me why it receives just the "this" argument and not the whole string ?

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  • Thread vs async execution. What's different?

    - by Eonil
    I believed any kind of asynchronous execution makes a thread in invisible area. But if so, Async codes does not offer any performance gain than threaded codes. But I can't understand why so many developers are making many features async form. Could you explain about difference and cost of them?

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  • JSF data transfer between UI and business layer

    - by Ram
    Hi, We are using JSF in UI, Spring in business layer, Hibernate in persistence layer. Now my question is how to pass data from the JSF UI to spring business layer. Can I directly use my business object in my backing bean or should I transfer data between the layer through DTO? Can one explain me with clear explanation if possible with piece of code and that related websites?

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  • High Frequency Trading

    - by Hamza Yerlikaya
    Over the last couple of weeks i have come across lots of articles about high frequency trading. They all talk about how important computers and software is to this but since they are all written from a financial point of view there is no detail about what does software do? Can anyone explain from a programmers point of view what is high frequency trading? and why is computer/software so important in this field?

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  • Using sed to convert hex characters in postgresql dump file

    - by Bernt
    I am working on moving several databases from a Postgresql 8.3 server to a Postgresql 8.4 server. It has worked fine so far, but one base has given me some trouble. The database is listed as unicode-encoded in the 8.3-server, but somehow a client program has managed to inject some invalid unicode data into it. When I do a normal dump and restore using postgres' custom format, the new server won't accept it, complaining about unicode errors. My plan is to do a plain text dump of the database, then use sed to replace the invalid characters with nothing (they are not needed). But how do you make sed work on hex/binary values in a file?

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  • A view model mvvm design issue

    - by Chen Kinnrot
    the best way to explain is with example so: this is the model public class Person { public int age; public string name; } this is the view model public class PersonVM { } my question is: should the vm expose the person to the datga template or encapsulate the model properties with his own properties?

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  • php: session_start() error

    - by Syom
    I have a file, which starts <?php session_start();?>, and it returns an error Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\xampp2\htdocs\index.php:1) in C:\xampp2\htdocs\index.php on line 3 and now take a look at the moment, i can't anderstand anyway when i copy the all content of my file into another file, it start working. can somebody explain how can it happen. thanks update i havent't any white spaces, at least i can't see them

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  • The question regarding cerr cout and clog

    - by skydoor
    Can anybody explain the difference between cerr cout and clog and why does different objects are proposed? I know the differences are as below: 1) cout can redirected but cerr can't 2) clog can use buffer. I am confused about the point 2, I am grateful if anybody can elaborate it more.

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  • use of system.exit(0)

    - by Warrior
    public class WrapperTest { static { print(10); } static void print(int x) { System.out.println(x); System.exit(0); } } In the above code System.exit(0) is used to stop the program. What argument does that method take? Why do we gave it as 0. Can anyone explain the concept?Thanks.

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  • What are the cheap CDN for Origin Pull?

    - by DucDigital
    I've read several thread around ServerFault about this, but still I am not satisfy with the answer so I post a question here. I need a Origin Pull CDN that support big file (more than 200MB). I don't need a storage place since they are too small, just to relay the server. Also the price should be afforable, ofcourse not more than 150$ a month for their smallest plan. I also need to pay by credit card since I do not work or stays in the US so it's hard for me to do a bank wire. Thank you very much

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  • Adding a Windows Server 2012 Essentials server to an existing domain, without migrating the AD

    - by TiernanO
    I have an existing Active Directory in house, a mix between a Win2K8R2 and Win2K3 domain, and i would like to test out Windows Server 2012 Essentials BETA on the network. When walking though the install, it gives me the option of a new domain, or migrating from an existing domain. when clicking existing, it tells me i can only have one SBS server running on a domain at a time... So, i dont have any existing SBS servers in house (both are full standard or enterprise editions) but i do plan on keeping at least one of these extra servers running... So, how do i get a 2012 Essentials server to join a domain, and not migrate the existing domain? or if i do migrate, can i still get one of the other boxes to act as secondary controllers?

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  • Information on Hook Constants

    - by dsaccount1
    Anyone can explain what these hooks do? Especially WH_MIN and WH_MAX. http://msdn.microsoft.com/en-us/library/ms644959(VS.85).aspx WH_MIN = -1 WH_MSGFILTER = -1 WH_JOURNALRECORD = 0 WH_JOURNALPLAYBACK = 1 WH_KEYBOARD = 2 WH_GETMESSAGE = 3 WH_CALLWNDPROC = 4 WH_CBT = 5 WH_SYSMSGFILTER = 6 WH_MOUSE = 7 WH_HARDWARE = 8 WH_DEBUG = 9 WH_SHELL = 10 WH_FOREGROUNDIDLE = 11 WH_CALLWNDPROCRET = 12 WH_KEYBOARD_LL = 13 WH_MOUSE_LL = 14 WH_MAX = 15

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  • I created a Python egg; now what?

    - by froadie
    I've finally figured out how to create a Python egg and gotten it to work. What do I do with it now? How do I use it? How do I ensure that everything was correctly included? (Simple steps please... not just redirection to another site. I've googled, but it's confusing me, and I was hoping someone could explain it in a couple of simple bullet points or sentences.)

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  • Web application design with distributed servers

    - by Bonn
    I want to build a web application/server with this structure: main-server sub-server transaction-server (create, update, delete) view-server (view, search) authentication-server documents-server reporting-server library-server e-learning-server The main-server acts as host server for sub-server. I can add many sub-servers and connect it to main-server (via plug-play interface maybe), then it can begin querying data from another sub-servers (which has been connected to the main-server). The sub-servers can be anywhere as long as connected to internet. The main-server can manage all sub-servers which are connected to it (query data, setting permission between sub-servers, etc). The purpose is simple, the web application will be huge as the company grows, so I want to distribute it into small connected plug-able servers. My question is, does the structure above already have a standardized method? or are there any different views? what are the technologies needed? I need a lot of researches before the execution plan begin. thanks a lot.

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