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  • designing solution to dynamically load class

    - by dot
    Background Information I have a web app that allows end users to connect to ssh-enabled devices and manipulate them. Right now, i only support one version of firmware. The logic is something like this: user clicks on a button to run some command on device. web application looks up the class name containing the correct ssh interface for the device, using the device's model name. (because the number of hardware models is so small, i have a list that's hardcoded in my web app) web app creates a new ssh object using the class loaded in step 2. ssh command is run and session closed. command results displayed on web page. This all works fine. Now the end user wants me to be able to support multiple versions of firmware. But the catch is, they don't want to have to document the firmware version anywhere becuase the amount of overhead this will create in maintaining the system database. In other words, I can't look up the firmware version based on the device. The good news is that it sounds like at most, I'll have to support two different versions of firmware per device. One option is to name the the classes like this: deviceX.1.php deviceX.2.php deviceY.1.php deviceY.2.php where "X" and "Y" represent the model names, and 1 and 2 represent the firmware versions. When a user runs a command, I will first try it with one of the class files, if it fails, i can try with the second. I think always try the newer version of firmware first... so let's say in the above example, I would load deviceX.2.php before deviceX.1.php. This will work, but it's not very efficient. But I can't think of another way around this. Any suggestions?

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  • Unix / linux permissions setup for shared hosting with Apache

    - by weiyin
    I'm in the process of setting up a server from a clean CentOS 5 install. What is the best permission structure (users, groups, unix permissions) for running a single instance of apache for multiple users? Ideally, it should satisfy these requirements: Each user's websites are stored in a subdirectory of their home directory. Users can edit files and permissions. Apache can read the websites of all users. No user can read the website files of other users. Bonus question: how to add PHP and/or Perl and/or Ruby to Apache without allowing any users to access any other user's files?

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  • Equalizing Agent and Master Nagios on state change alone

    - by punith
    We have a setup where there are distributed Nagios running on multiple sites and are equalizing their data to the main Nagios server. The problem is it sends back the data to main Nagios server no matter if there is a state change in host or service. Is it possible to configure the slave Nagios to check the service/Host every 5 sec but send back the data only if there is a state change. Currently it is implemented by Obsess Over Hosts/Service which always runs the command which will equalize. Nagios version is 3 I am no administrator but a developer so I don't know the exact jargon so please bare with me.

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  • How to configure linux routing/filtering to send packets out one interface, over a bridge and into another interface on the same box

    - by rj75
    I'm trying to test a ethernet bridging device. I have multiple ethernet ports on a linux box. I would like to send packets out one interface, say eth0 with IP 192.168.1.1, to another interface, say eth1 with IP 192.168.1.2, on the same subnet. I realize that normally you don't configure two interfaces on the same subnet, and if you do the kernel routes directly to each interface, rather than over the wire. How can I override this behavior, so that traffic to 192.168.1.2 goes out the 192.168.1.1 interface, and visa-versa? Thanks in advance!

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  • php-cgi.exe process on IIS

    - by HYP
    The production server runs a PHP application on IIS 6.0. During the peak hours we have had a few issues where the php-cgi.exe processes increase in numbers and approach around 200. The server comes to a crawl and we have to restart the server a multiple times to restore the normal behavior. When the server is running normally, I have noticed that there are only 10-15 php-cgi.exe processes in the task manager. What could be causing the php-cgi.exe processes to increase in number from 10-15 to around 200 during the peak hours? Where should I look for a cause?

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  • What factors can affect performance of Http Server written in C-Sharp? [on hold]

    - by Yousaf
    I am having trouble in terms of handling huge databases. I have multiple clients like 100-300 (clients are basically servers with i.e windows sql). Each client may have 38 thousand rows/listing of data, each row has 10-12 fields. I cannot afford to have json files of each client and than handle them on main server, because of memory issue. What if i have http server written in c or c# installed on clients and they return 250 rows in each response to the main server. How the factors like speed, memory or other issues can effect us ? What exactly I am asking for ? In short words if a server writter in c-sharp sends 250 rows per request. What factors can effect the performance of server ? for example. Speed, processing, Operating system, Implementation of algorithm of server ? How these factors can really effect the performance on large scale?

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  • Best server for mailing application [closed]

    - by Cyber Junkie
    My application is similar to a reminder service that reminds users of events that they scheduled. I'm sending emails to users through a PHP script. I'm not sending one email to multiple recipients. Each recipient receives a different message. I plan to use cron jobs every minute and expect the application to send roughly 200 individual emails in 1 hour (for a small user base that may grow). I don't have hosting experience with this type of application. I plan to start on a shared host and move up in the future to vps or dedicated. Most shared hosts that I looked into allow 50-100 emails per hour with delays between mailings. Please kindly inform me what I should look for in web hosts for this kind of application.

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  • Copy/Paste including Hidden Columns when Filtering Rows in Excel 2010

    - by hudsonsedge
    I suspect the solution will be related to this question?? I have a spreadsheet that comes to me pre-formatted with hidden columns sprinkled in multiple places (for viewing brevity's sake). I need to turn on filtering, apply a filter to one of the columns, and then paste the resulting rows to a new sheet - including the hidden columns (lather, rinse, repeat). I'd prefer to not undo/re-do the hidden columns unless I have to. Is it possible to paste the hidden columns without adding the extra steps?

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  • How do shared hosting servers keep executing code from crossing accounts?

    - by acidzombie24
    I am kind of curious, how does a hosting server support multiple users with php but keep each user away from the other code? The 'easy' solution i thought were file permissions. So every user can have www-data belong to their group and the server would have executing access but the users cant access the others file. But then i realize the user running the php would be www-data who has permission to read everyones data. So how does a shared host prevent this from happening? PS: I personally use nginx (with fastcgi php). But i am somewhat familiar on how apache works.

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  • Localization of Database Strings in .Net

    - by Aligned
    I have several database tables that have a description column that I need to display in the UI. .Net has .resx files that will help with the translation of the strings, when the Thread.CurrentCulture.UICulture is set, but I needed a custom approach for the strings that are stored in the database and not in the .resx files. Here’s my approach: 1. Create a resource file for each database table and put them in the /Resources/Database/ directory. 2. Create a method in LocalizationHelpers (GetLocalizedString) that will get the string from the table for English (which should be cached to avoid unneeded service/database calls) or the resx when not English. 3. All database tables need to have a ResxKey field that matches the key in the resx file. 4. By convention the resx file will have the same name as the database table, and the key the same as the database ResxKey.   - if there are multiple columns that need translation, then one ResxKey will be used and Name or Description appended. Here’s the method I’m using to pull the string: public static string GetLocalizedString(string resourceName, string resourceKey) { if (executingAssembly == null) { executingAssembly = Assembly.GetExecutingAssembly(); } ResourceManager manager = new ResourceManager(resourceName, executingAssembly); return manager.GetString(resourceKey); }

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  • Is there a way to change the permissions of a series of directories on Windows 7 without getting a dialog box when it can't change the rights?

    - by leeand00
    Is there some way to change the permissions recursively on a series of directories without getting a dialog box that pops up and tells me it can't change the permissions on a particular file? I keep getting this dialogs multiple times duing the process of changing permissions: An error occurred while applying security information to: C:\pagefile.sys The process cannot access the file because it is being used another process. Eventually I get so many of them that I start clicking the mouse or pressing the space bar so many times that I accidentally click the cancel button. Also it would be great if I could keep a log of which files it can't change permissions on. Is this possible in Windows 7? Does it have to be done from the command prompt or from powershell?

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  • Can't conncet to memcached

    - by DMClark
    We currently have memcached running on CentOS. None of our PHP applications can connect, have tried multiple applications trying to establish access. The most informative PHP error we get is: "Memcache::get() [function.Memcache-get]: Server 127.0.0.1 (tcp 11211) failed with: Permission denied (13) in /var/www/.." memcached 1.4.5 PECL 2.25 We can telnet and it works. IP tables is full access from lo to lo. We've tried this on two different servers with both compiled version and the rpm in CentOS 5.5 and get the same result. Is there anything fairly obvious that we are missing?

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  • Preparing a hyper-v VM image

    - by Anteru
    We have a Hyper-V Windows Server 2k3, and we're hosting multiple VMs on it. However, right now, we always start the VM creation right on the server, i.e. when preparing a new Ubuntu image, I just install it into a new VM and set it up and when I'm happy we store the disk image. I wonder if there is a way to prepare a hyper-v image locally on my desktop machine instead? I'm running Windows 7, and I would love to be able to set up a VM so that we can copy the image over to the server and be done with it. This is for linux images only, and we definitely need the hyperv network integration. Is there a recommended way how to prepare hyperv images without running a hyperv instance somewhere?

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  • Set generic iptables rules?

    - by tftd
    This may be a really dumb question but how can you open a port on multiple interfaces without defining the interfaces? For example how do I open port 22 on all interfaces? On my machine I have some interfaces that are dynamic and may or may not be available so I have to set "generic" rules. This code is not working for me but I can't figure out why: # My default policy is to drop the input. # The other policies are required like that. $IPTABLES -P INPUT DROP $IPTABLES -P OUTPUT ACCEPT $IPTABLES -P FORWARD ACCEPT $IPTABLES -t nat -P POSTROUTING ACCEPT $IPTABLES -t nat -P PREROUTING ACCEPT $IPTABLES -t mangle -P OUTPUT ACCEPT $IPTABLES -t mangle -P PREROUTING ACCEPT #Open port 22 on all interfaces ? $IPTABLES -A INPUT -p tcp --dport 22 -j ACCEPT So apparently there's something wrong with the last line... but I can't see it?

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  • Efficiency of iterators and alternatives? [migrated]

    - by user48037
    I have the following code for my game tiles: std::vector<GameObject_Tile*>::iterator it; for(int y = 0; y < GAME_TILES_Y; y++) { for(int x = 0; x < GAME_TILES_X; x++) { for (it = gameTiles[x][y].tiles.begin() ; it != gameTiles[x][y].tiles.end(); ++it) {}}} tiles is: struct Game_Tile { // More specific object types will be added here eventually vector<GameObject_Tile*> tiles; }; My problem is that if I change the vector to just be a single GameObject_Tile* instead and remove the iterator line in the loop I go from about 200fps to 450fps. Some context: The vector/pointer only contains one object in both scenarios. I will eventually need to store multiple, but for testing I just set it to a single pointer. The loop goes through 2,300 objects each frame and draws them. I would like to point out that if I remove the Draw (not seen int he example) method, I gain about 30 frames in both scenarios, the issue is the iteration. So I am wondering why having this as a vector being looped through by an iterator (to get at a single object) is costing me over 200 frames when compared to it being a single pointer? The 200+ frames faster code is: std::vector<GameObject_Tile*>::iterator it; for(int y = 0; y < GAME_TILES_Y; y++) { for(int x = 0; x < GAME_TILES_X; x++) { //gameTiles[x][y].tiles is used as a pointer here instead of using *it }} tiles is: struct Game_Tile { // More specific object types will be added here eventually GameObject_Tile* tiles; };

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  • Program to scale any OpenGL/DirectX window 2x larger?

    - by Neeb
    I would like to run some game on windowed mode, but its hard to see the game when my desktop resolution is huge. One solution could be to change my desktop resolution every time i play the game. But the bad thing is that my screen automatically smoothes the pixels when im using non-native resolutions, and the blurred pixels really makes it ugly and hard to look at. Is there some program to double the pixel size of any opengl/directx window without smoothing the pixels? I've tried multiple magnifying glass programs, but they all seem to make it blurred...

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  • How do you host images using Windows Server so that they are accessible over the internet? [closed]

    - by nairware
    I was trying to figure out a way to host images (picture images, not disk images) such that they are accessible over the internet via URLs--in a way similar to a web service like Photobucket or ImageShack. I have a whole bunch of Windows Servers (Windows Server 2008 R2) available in the cloud. Instead of hosting images using Photobucket or ImageShack, I wanted to host this images directly on my own Windows cloud. This could be really complicated or really simple. I have no idea, as I know very little about IIS 6 (which is what I am using) or web servers. If this is too broad of a question (as there are probably multiple ways of implementing this), is there at least some guide or documentation of how someone else has setup image hosting? Perhaps a step-by-step guide of at least one way to do it?

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  • How do I sync a subset of tables between two databases on the same mysql database server

    - by Mike
    would like to be able to sync a subset of tables between two mysql databases that are running on the same server. One of the databases acts as the master where inserts, updates and deletes can be made. The second database uses those same tables for read-only operations. I do not want to use federated tables to achieve this. The long term goal will be to separate the 2 databases to multiple servers, The second database that has the subset of tables as read-only may also be replicated a few times over to distribute geographically for load and performance purposes each with unqiue data.... Once that is achieved, I plan to use binlog to replicate those specific tables on the secondary databases. In the meantime, I'd like to keep these tables in sync. Is there a more elegant way to do this than other than using a cronjob and mysqldump?

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  • HTTPS load balancing based on some component of the URL

    - by user38118
    We have an existing application that we wish to split across multiple servers (for example: 1000 users total, 100 users split across 10 servers). Ideally, we'd like to be able relay the HTTPS requests to a particular server based on some component of the URL. For example: Users 1 through 100 go to http://server1.domain.com/ Users 2 through 200 go to http://server2.domain.com/ etc. etc. etc. Where the incoming requests look like this: https://secure.domain.com/user/{integer user # goes here}/path/to/file Does anyone know of an easy way to do this? Pound looks promising... but it doesn't look like it supports routing based on URL like this. Even better would be if it didn't need to be hard-coded- The load balancer could make a separate HTTP request to another server to ask "Hey, what server should I relay to for a request to URL {the URL that was requested goes here}?" and relay to the hostname returned in the HTTP response.

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  • Fix mail that has been put in deferred folder

    - by Safado
    So we have a little more than usual deferred mail on our Postfix server, so I started to look through the messages to make sure we weren't hacked and sending out spam. Everything is fine and it turns out that a bot had filled out our Request Info form multiple times with bad info. However, I did find one that was a legitimate request for more information about our company and I noticed that it isn't sending because they fat-fingered the address with gmal.com. Is there a way I can correct that and have Postfix send it out? This is on a CentOS server.

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  • RAID striping on a desktop machine

    - by Blazemore
    I currently have a 120Gib SSD which is pretty fast for things like game loading times and video editing. However, I was wondering about getting another identical drive and hooking it up with a striping RAID array in hardware (I boot multiple operating systems). This would have the dual benefits of providing a larger logical drive, while also providing greater performance. However, I have a few questions: What kind of performance increase can I expect to see with a pair of good quality SSDs? How expensive is a quality desktop RAID controller? Will the controller present the OS with a single logical drive? Does this mean I can still partition it and multi-boot? Basically, can I treat the RAID controller as "a hard drive" at the OS level?

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  • What's an alternative to using public folders (in Outlook)?

    - by Ivo Flipse
    My colleagues abuse our mail servers public folders to store (old) emails so that everyone can read them using IMAP. I'm looking into good alternatives after reading this Tech Republic article: "10 reasons why you should begin phasing out Exchange public folders" The most important thing they need is access to emails from multiple computers without overloading our network. So do you have any suggestions for alternatives? If there's a nice combination with some CRM system it would be interesting too. Note: this doesn't have to be freeware, usability and efficiency are more important. The solution has to be Windows 32 bit only

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  • best tool for searching within unstructured log files [closed]

    - by Alex Holding
    i am supporting a number of bespoke applications at the minute and searching through their very non standard logs is a nightmare, so im looking for a tool which can do the following - load large text files search through multiple files at once and display all results can search with regex can be used to view and search unstructured text files There are some great looking log tools available but they all seem to be focused on structured logs, where the logs i deal with most days are just flat text files. I am currently using notepad++ but that has its own annoyances so im hoping there is a dedicated log analysis tool that i havent found yet.

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  • mod_rewrite to redirect to specific WP page

    - by djdy
    The goal is to redirect all requests coming to Wordpress from IE 6 and 7, to a specific Wordpress page using mod_rewrite. My confusion comes from multiple conditions that are needed for the rewrite not entering an endless loop once on the specific Wordpress page. So the condition must be: (IE 6 or 7) and request is not the same as the page we are sending them to. I've tried things along the lines of: RewriteCond %{HTTP_USER_AGENT} MSIE\ ([67])\. RewriteCond %{REQUEST_URI} !iepage RewriteRule .* /iepage/ [R] In IE 6 and 7, I get page cannot be displayed errors. Could it really mean too many redirects, because the 2nd condition isn't working?

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  • Requiring a specific order of compilaiton

    - by Aber Kled
    When designing a compiled programming language, is it a bad idea to require a specific order of compilation of separate units, according to their dependencies? To illustrate what I mean, consider C. C is the opposite of what I'm suggesting. There are multiple .c files, that can all depend on each other, but all of these separate units can be compiled on their own, in no particular order - only to be linked together into a final executable later. This is mostly due to header files. They enable separate units to share information with each other, and thus the units are able to be compiled independently. If a language were to dispose of header files, and only keep source and object files, then the only option would be to actually include the unit's meta-information in the unit's object file. However, this would mean that if the unit A depends on the unit B, then the unit B would need to be compiled before unit A, so unit A could "import" the unit B's object file, thus obtaining the information required for its compilation. Am I missing something here? Is this really the only way to go about removing header files in compiled languages?

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