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  • Managed LAMP platform for maximizing availability and global reach, not scalability

    - by user66819
    Assume a Linux/Apache/MySQL/PHP application for a small base of registered users. With small userbase, there are no traffic peaks so the scalability that cloud platforms offer is not imperative. But the system is mission-critical, so availability is the primary goal. Users are also distributed across Asia, Europe, and US, so multiple server locations that minimize users' network hops would be highly desirable. The dream: a managed VPS platform where we would configure a single server (uploading PHP and other files, manipulating database, etc.), and the platform would automatically mirror the server in a handful of key places around the world (say one on each US coast, one in Europe, one in east Asia). File system synchronization and MySQL replication would happen automatically. Core operating system is managed, so we don't need to do full system administration and security, and low-level backups are also done by service provider, though we also do our own backups as well. Couple this with some sort of DNS geo-detection, so users are routed to the nearest operational server... with support for https, of course. Does such a dream exist? If not, what are some approaches to accomplish the same end with minimal time investment and minimal monthly hosting costs?

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  • Setting Environment Variable for nginx and Rails consumption

    - by kolrie
    Apache's module mod_env offers a handy way of setting environment variables in configuration files, like: <VirtualHost *:80> ServerName xyz.com DocumentRoot /var/www/rails_app/public PassengerAppRoot /var/www/rails_app SetEnv MY_VARIABLE contents </VirtualHost> http://httpd.apache.org/docs/2.0/mod/mod_env.html#setenv However, in nginx I couldn't find anything that serves the same purpose. What's the alternative here? I thought of setting environment variables in .profile files (I am using Ubuntu 10.04), but that wouldn't have the same "per vHost" isolation I have with Apache, right? What are the alternatives here?

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  • Do ALL your variables need to be declared private? [closed]

    - by skizeey
    Possible Duplicate: Why do we need private variables? I know that it's best practice to stay safe, and that we should always prevent others from directly accessing a class' properties. I hear this all the time from university professors, and I also see this all the time in a lot of source code released on the App Hub. In fact, professors say that they will actually take marks off for every variable that gets declared public. Now, this leaves me always declaring variables as private. No matter what. Even if each of these variables were to have both a getter and a setter. But here's the problem: it's tedious work. I tend to quickly lose interest in a project every time I need to have a variable in a class that could have simply been declared public instead of private with a getter and a setter. So my question is, do I really need to declare all my variables private? Or could I declare some variables public whenever they require both a getter and a setter?

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  • Setting up a global MySQL Cluster in the cloud

    - by GregB
    I'm giving the question an overhaul to more specifically identify where I need help. I use two tools to manage a bunch of cloud server: Puppet and Rundeck. Both of these can be configured to use a mysql backend. I'd like to setup an instance of each application in both the U.S., and the U.K., treating the U.K. servers as hot stand-bys in case of failure in the U.S. I want to use a MySql cluster so that the data is automatically replicated from the U.S. to the U.K. Because these are hot standbys, high performance is not a goal. Redundancy and data integrity are most important. My question revolves around the setup of the mysql cluster. I want to run three servers, each one running a data node, a sql node, and a management node. Is this a valid configuration for mysql server? If so, could someone point me in the right direction for creating such a setup? I've downloaded the offical tarball, and the official debian, and the documentation for them contradicts many of the online tutorials. I'm installing on Ubuntu 10.04.

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  • Do ALL your variables need to be declared private?

    - by shovonr
    I know that it's best practice to stay safe, and that we should always prevent others from directly accessing a class' properties. I hear this all the time from university professors, and I also see this all the time in a lot of source code released on the App Hub. In fact, professors say that they will actually take marks off for every variable that gets declared public. Now, this leaves me always declaring variables as private. No matter what. Even if each of these variables were to have both a getter and a setter. But here's the problem: it's tedious work. I tend to quickly loose interest in a project every time I need to have a variable in a class that could have simply been declared public instead of private with a getter and a setter. So my question is, do I really need to declare all my variables private? Or could I declare some variables public whenever they require both a getter and a setter?

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  • Local traffic through VPN, global traffic through WAN

    - by ikonoma
    I have an issue with my internet connection. I am using VPN (Aventail Client) to access the local resources. When connected to VPN the Internet traffic passes through it, not through my LAN or Wi-Fi network. I would like to change the routing table to use the Wi-Fi adapter of the PC for WAN traffic. I have routing file, which works very well and routes the traffic in this way, but only when I am physically connected to the local network through LAN. But I can't set it to work with the VPN connection, because I have no gateway when I am connected to it. Etc this in bold is missing. What to do? route change 0.0.0.0 mask 0.0.0.0 172.16.76.1 metric 200 if 12 route change 0.0.0.0 mask 0.0.0.0 10.44.2.1 metric 400 if 11 route add 150.251.0.0 mask 255.255.0.0 10.44.2.1 metric 100 if 11 route add 10.0.0.0 mask 255.0.0.0 10.44.2.1 metric 100 if 11 pause

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  • Global Email Forwarding with EXIM?

    - by Dexirian
    Been trying to find a solution to this for a while without success so here i go : I was given the task to build a High-Availability Load-Balanced Network Cluster for our 2 linux servers. I did some workaround and managed to get a DNS + SQL + Web Folders + Mails synchronisation going between both. Now i would like my server 2 to only do mailing and server 1 to only do web hosting. I transfered all the accounts for 1 to 2 using the WHM built-in account transfert feature. I created 2 different rsync jobs that sync, update, and delete the files for mail and websites. Now i was able to successfully transfer 1 mail accounts from 1 to 2, and the server 2 works flawlessly. All i had to do was change the MX entries to point to the new server and bingo. Now my problem is, some clients have their mail softwares configured so that they point to oldserver.domain.com. I cant make the (A) entry of oldserver.domain.com point to the new server for obvious reasons. I thought of using .foward files and add them to the home directories of the concerned users but that would be very difficult. So my question is : Is there a way to configure exim so that it will only foward mails to the new server? I need to change all the users so they use their mail on server 2 without them doing anything. Thanks! EDIT : TO CLARIFY MY PROBLEM Some clients have their mail point to oldserver.xyz instead of mail.olderserver.xyz I want to know if i can do something to prevent modifying the clients configuration I would also like to know is there is a way to find out what clients aren't properly configured

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  • Where should you store variables for a search program in java?

    - by Bored915
    I'm wondering which is a more effective storage method in java. Would be better to save variables that will not change in a class or a resource? They're going to be variables that contain a set amount so that later a search program will go through the list of variables so as to recognize possible options. Also if there is a more efficient method of storing them please say so or if i doesn't matter where i store them.

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  • struts2: Redirect from global interceptor

    - by Dewfy
    In struts2 I have very simple task, after user is logged-in I'm checking if they profile is complete. If not user should be blocked from any other action and redirected to edit page. So I have created my default package: <package name="main" extends="tiles-default" > <interceptors> <interceptor name="checkProfile" class="my.CheckProfileInterceptor" /> <interceptor-stack name="secure"> <interceptor-ref name="defaultStack"/> <interceptor-ref name="checkProfile"/> </interceptor-stack> </interceptors> <default-interceptor-ref name="secure"/> </package> After it all my packages would include this template as a base: <package namespace="/packageA" name="packageA" extends="main"> ... <package namespace="/packageB" name="packageB" extends="main"> ... Saying editing page is /packageA/editProfile, my interceptor does following: public String intercept(ActionInvocation actionInvocation) throws Exception { if( currentUser.isOk() ) return "editProfile"; ... BUT! interceptor is global, so it raises struts2 error: No result defined for action (name of editProfile action class) When interceptor is placed inside some package - then everything ok. What should i do to declare global action?

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  • In Ruby, how to implement global behaviour?

    - by Gordon McAllister
    Hi all, I want to implement the concept of a Workspace. This is a global concept - all other code will interact with one instance of this Workspace. The Workspace will be responsible for maintaining the current system state (i.e. interacting with the system model, persisting the system state etc) So what's the best design strategy for my Workspace, bearing in mind this will have to be testable (using RSpec now, but happy to look at alternatives). Having read thru some open source projects out there and I've seen 3 strategies. None of which I can identify as "the best practice". They are: Include the singleton class. But how testable is this? Will the global state of Workspace change between tests? Implemented all behaviour as class methods. Again how do you test this? Implemented all behaviour as module methods. Not sure about this one at all! Which is best? Or is there another way? Thanks, Gordon

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  • first data global gateway API - invalid XML problem

    - by B.Georg
    Hello, i am implementing the First Data Global Gateway API into a Java E-Commerce Web application. The problem that i have is that I get an error message SGS-020003: Invalid XML returned from the staging.linkpt.net server. By switching the optional entities off, I managed to locate the problematic entity. It is the Shipping entity. I have the following data inside it: <shipping> <zip>10105</zip> <phone>123456789</phone> <email>[email protected]</email> <name>DJBla</name> <state>NY</state> <address1>some city</address1> <address2>suite 6</address2> <city>New York</city> <country>US</country> </shipping> According to the First Data Global Gateway User Manual Version 1.1 everything is correct with my XML. Would anyone have an idea where the error could be? Kind Regards, B.Georg

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  • On C++ global operator new: why it can be replaced

    - by Jimmy
    I wrote a small program in VS2005 to test whether C++ global operator new can be overloaded. It can. #include "stdafx.h" #include "iostream" #include "iomanip" #include "string" #include "new" using namespace std; class C { public: C() { cout<<"CTOR"<<endl; } }; void * operator new(size_t size) { cout<<"my overload of global plain old new"<<endl; // try to allocate size bytes void *p = malloc(size); return (p); } int main() { C* pc1 = new C; cin.get(); return 0; } In the above, my definition of operator new is called. If I remove that function from the code, then operator new in C:\Program Files (x86)\Microsoft Visual Studio 8\VC\crt\src\new.cpp gets called. All is good. However, in my opinion, my implementations of operator new does NOT overload the new in new.cpp, it CONFLICTS with it and violates the one-definition rule. Why doesn't the compiler complain about it? Or does the standard say since operator new is so special, one-definition rule does not apply here? Thanks.

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  • Sharing a global/static variable between a process and DLL

    - by minjang
    I'd like to share a static/global variable only between a process and a dll that is invoked by the process. The exe and dll are in the same memory address space. I don't want the variable to be shared among other processes. Elaboration of the problem: Say that there is a static/global variable x in a.cpp. Both the exe foo.exe and the dll bar.dll have a.cpp, so the variable x is in both images. Now, foo.exe dynamically loads (or statically) bar.dll. Then, the problem is whether the variable x is shared by the exe and dll, or not. In Windows, these two guys never share the x: the exe and dll will have a separate copy of x. However, in Linux, the exe and dll do share the variable x. Unfortunately, I want the behavior of Linux. I first considered using pragma data_seg on Windows. However, even if I correctly setup the shared data segment, foo.exe and bar.dll never shares the x. Recall that bar.dll is loaded into the address space of foo.exe. However, if I run another instance of foo.exe, then x is shared. But, I don't want x to be shared by different processes. So, using data_seg was failed. I may it use a memory-mapped file by making an unique name between exe and dll, which I'm trying now. Two questions: Why the behavior of Linux and Windows is different? Can anyone explain more about this? What would be most easiest way to solve this problem on Windows?

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  • [C++] Trouble declaring and recognizing global functions

    - by Sarah
    I've created some mathematical functions that will be used in main() and by member functions in multiple host classes. I was thinking it would be easiest to make these math functions global in scope, but I'm not sure how to do this. I've currently put all the functions in a file called Rdraws.cpp, with the prototypes in Rdraws.h. Even with all the #includes and externs, I'm getting a "symbol not found" error at the first function call in main(). Here's what I have: // Rdraws.cpp #include <cstdlib> using namespace std; #include <cmath> #include "Rdraws.h" #include "rng.h" extern RNG rgen // this is the PRNG used in the simulation; global scope void rmultinom( double p_trans[], int numTrials, int numTrans, int numEachTrans[] ) { // function 1 def } void rmultinom( const double p_trans[], const int numTrials, int numTrans, int numEachTrans[]) { // function 2 def } int rbinom( int nTrials, double pLeaving ) { // function 3 def } // Rdraws.h #ifndef RDRAWS #define RDRAWS void rmultinom( double[], int, int, int[] ); void rmultinom( const double[], const int, int, int[] ); int rbinom( int, double ); #endif // main.cpp ... #include "Rdraws.h" ... extern void rmultinom(double p_trans[], int numTrials, int numTrans, int numEachTrans[]); extern void rmultinom(const double p_trans[], const int numTrials, int numTrans, int numEachTrans[]); extern int rbinom( int n, double p ); ... int main() { ... } I'm pretty new to programming. If there's a dramatically smarter way to do this, I'd love to know.

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  • Can I set Session timeout for a specified Session variable differently than other Session Variables

    - by Eppz
    I'd like to set the timeout on a specific Session Variable in a .Net web application, but leave other Session variables alone. Is this possible? Example: I have 5 Session Variables Session(var1) Session(var2) Session(var3) Session(var4) Session(var5) I want to set it so that Session(var1) through Session(var4) have a timeout of 8 hours (480 minutes), but Session(var5) has a timeout of 20 minutes. Can it be done?

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  • Inspecting variables in Xdebug problems

    - by tom
    I've been using xdebug to do php debugging (netbeans or eclipse). I am usually able to inspect variables OK. However, sometimes when I expand a disclosure triangle for a variable -- typically when the client is making an AJAX call -- it will result in an empty response being returned and causing the AJAX call to fail. Has anyone run into this? Is there a way to make PHP debugging with xdebug more robust? (Not being able to inspect variables defeats the purpose of a debugger. Thanks

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  • Python: load variables in a dict into namespace

    - by celil
    I want to use a bunch of local variables defined in a function, outside of the function, so I am passing x=locals() as a return value. How can I load all the variables defined in that dictionary into the namespace outside the function, so that instead of accessing the value using x['variable'], I could simply use variable.

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  • c declaring variables in blocks

    - by anon
    I know that in C++, I can declare variables pretty much everywhere. I recall once reading that in C, variables must be declared at the top of a function i.e. the following is invalid: void foo() { int good; if (...) { int bad; } } In the above code, is the declaraing of the bad varaible legal by C standards, or only legal due to a gcc extension? Thanks!

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  • what is session and session variables ? Plz guide

    - by haansi
    hello, I am new to asp.net Can you please guide me what is session and session variables ? Please I don't need a comparision of asp session and asp.net session because I don't know anything about asp. I have saw many articles on types of session as well. But still I cant understand erectly what is session and what are session variables in asp.net ? Please guide me. thanks

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  • PHP: How to implement a __get-like method for local function variables

    - by Tom Frost
    I'm no stranger to __get(), and have used it to make some very convenient libraries in the past. However, I'm faced with a new challenge (PHP 5.3, abbreviated and simplified my code for this question): <?php namespace test; class View { function __construct($filename, $varArray) { $this->filename = $filename; $this->varArray = $varArray; } function display() { include($this->filename); } function __get($varName) { if (isset($this->varArray[$varName])) return $this->varArray[$varName]; return "?? $varname ??"; } } ?> Above is a very, very simplified system for loading a View. This code would call the view and display it: <?php require_once("View.php"); use test\View; $view = new View("views/myview.php", array("user" => "Tom")); $view->display(); ?> My goal for this code is to allow the view "myview.php" to contain code like this: <p> Hello <?php echo $user; ?>! Your E-mail is <?php echo $email; ?> </p> And, used with the above code, this would output "Hello Tom! Your E-mail is ?? email ??" However, this won't work. The view is being included within a class method, so when it refers to $user and $email, it's looking for local function variables -- not variables belonging to the View class. For this reason, __get never gets triggered. I could change all my view's variables to things like $this-user and $this-email, but that would be a messy and unintuitive solution. I'd love to find a way where I can reference variables directly WITHOUT having PHP throw an error when an undefined variable is used. Thoughts? Is there a clean way to do this, or am I forced to resort to hacky solutions?

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  • Codeigniter how to access class variables

    - by Obay
    I thought this was going to be a no-brainer but I can't seem to access member variables: class MyObject extends Controller { private $START_OF_WEEK = 1; /* constructor here */ function index() { echo $this->$START_OF_WEEK; } } echo $this->$START_OF_WEEK; says Cannot access empty property How do I access member variables? Or... how do I declare them correctly?

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