My web app must access database via web service, and can not access databse directly.
In case my web app is deployed into a web farm, to remember the user's preference, I think I can't use ASP.NET Profile directly.
I have an asp.net application running on a web farm that allows users to upload files and download them later via link to that file. Currently, I use Windows DFS to replicate the local IIS directory where the files are stored across the web farm servers. However, as this solution does not scale out, I want to implement a more scalable solution by partitioning the documents. Specifically, say I set up multiple file storage servers (Fs1, Fs2, Fs3, etc.) on the network. Further, let's say I change my upload page to save the uploaded file to one of the file storage servers on the local LAN (based on some logic). I assume so far I am safe with ASP.NET doing this much assuming I have the correct permission for the ASP.NET process ID. The question I have is withregards to download links. When a user gets served a download link to their document (e.g. http://www.testco.com/data/doc1.txt) is there a way for me to "intercept" that HTTP request and underneath the coversserve the doc1.txt from the file storage server (e.g. Fs2) it resides
View 5 RepliesI've got a web application that runs of a state server. It looks like soon it may need to distributed and there will be two web servers behind a load balancer.
This works great for session state but my next challenge is Cache
My application leverages heavily of cache. I understand ASP.Net 4.0 will be offering more here but nothing much has been said about the how too.
There are two challenges that I face
1). Each webserver will have its own copy of cache whereas it would be more efficient to put this to a third server the same as session state is put to state server.
2). The real challenge is keeping cache in sync if a simple dataset derived from the database is changed my code dumps that cache item and reloads the cache. That's all well on one webserver but webserver number two wont know to drop that particular cache item and reload it. This could cause some unexpected problems in the application.
For scenario number 2 I could attempt to do some smart coding so server number two knows to dump the cache and reload it.
My guess is someone else has already been here before and there's probably a better implementation approach rather than writing extra code.
Does anyone know how I could achieve the goal of keeping Cache in sync between multiple webservers or even better farm Cache management to another server?
I want to access membership and profile objects and wants to access profile properties that I have defined in my web app web.config file, from a windows service. I have used this code
foreach (MembershipUser user
in Membership.GetAllUsers())
{
ProfileCommon userProfile = profile.GetProfile(user.UserName);
}
But its giving the followin errors The type or namespace name "ProfileCommon" could not found (are you missing a using directive or an assembly reference?) The type or namespace name "MembershipUser" Could not found (are you missing a using directive or an assembly reference?)
I am using profile services to store some attributes of users registered in the website. Now I am making a display profile page for a user. The problem is that the profile loads easily when I am running the site from VS 2010, but it gives the following error when I run it from IIS7 on my local machine:
System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
[Code]....
[code]....
I'm trying to update/create the user profile for a specific user that will not be the logged on user of the moment. I'm able to do this with the following code:
'Dim p As ProfileBase = ProfileBase.Create(Email, False)
I am logged in as user1, and while creating a user in which I have additional information which would store first and last name into the profile database. I have the following code
[Code]....
But because I just have profile like that, it is updating the profile of user1 not the new user i just created
[Code]....
I'm being stupid but don't know what I'm missing.I want to use asp.net profile and have a profile property.So in the webconfig for my site I've added:
<profile>
<properties>
<add name="Name"/>
</properties>
</profile>
But in the code behind a page I cannot use Profile.Visual Studio is just saying the Profile is not known in the current context.Thus I cannot do
Profile.Name = ....
or
x = Profile.GetPropertyValue(....)
Web farm is used for multiple request and multiple user using switching among them.
Web Garden creates worker processes for every processor individually for one user.
Is it possible to use worker process as a switch and convert it into Web Farm that can allocate multiple processor on bases of algorithm?
Currently have an asp.net web site which is contained on 2 web servers which are load balanced i.e. web farm.
I would like to have some code which would allow me to call a particular server and execute a method on it. I WANT TO do this so that i can force all web servers to refresh their cache via a web page on the site.
Use Case is: Admin user logs into site and makes a change to a setting which is cached and then clicks "Refresh web server cache" button which then calls the update cache method on each of the servers. this is to prevent me from having to restart the app pool every time a cached setting is changed.
Given the idea of a web application (.NET 3.5+)
Browser
web app
the authentication using forms will result in a similar line of code
FormsAuthentication.SetAuthCookie(strUsrNm, True)
this is fine in a non load balanced server instance. how does authentication work in a load balanced stuation (no sticky session/infinity), and you cannot store the client IP, users password or login in the browser.
Browser
Load balancer
Web app (on server 1) || Web app (on server 2)
limitations: no database sessions, no AD server (for example: cater for external users)in short - in a load balanced situation how does the appliation know who the user is if they authenticated against the other server without re-authenticating.
difference between the Web Farm and Web Garden with some real time scenario?
View 2 RepliesWe have a small web farm(2 servers) balanced by the built in network load balancer in Windows 2003. We have a few pages that use page caching. My question is: Is it possible that that a given user could cause a page to be cached and another user see that content? Here is the page directive for the page in question:
<%@ OutputCache Duration="1" NoStore="true" VaryByParam="none" %>
The reason the duration is set to "1" is to ensure that the page isn't cached any longer than 1 second because of transactions that actions on the page can trigger.
So I have an ASP.Net web forms application that is using URL Routing. It works great on the old single server shared web hosting account. It has been moved over to a new platform that appears to be a web farm. When a postback happens it now just refreshes the page and the event handler is not envoked. Another thing I've noticed is they put the application into a sub-folder on the account and are using ISAPI Rewrite to point the domain to the sub folder.how to get the postback to execute on this web farm?
View 1 RepliesI am working on a project where we want to provide link to download excel file.We are using NLB for load balancing,NLB cluster contains 3 machines.constraint is that excel file to be downloaded is available on a single machine.How to ensure that HTTP request underneath will served from the same mahine?
View 1 RepliesI'm considering using the HttpContext.Items HashTable to store reuseable user data (per user) instead of in the Session,
I'm hoping that this data is stored on the client and not on the server, but I did not see anywhere that this is the case...
Also, is there any drawback or loss of data that can happen when using web farm or clustered web servers ?
We have an array of about 12 servers serving a website. Over the past few hours, one single server has started throwing exceptions for WebResource.axd and ScriptResource.axd requests.
Exception
System.Web.HttpException - This is an invalid script resource request.
Stack Trace
at System.Web.Handlers.ScriptResourceHandler.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
Broken server URL
/WebResource.axd?d=S6kjkBsrIKni9uO5HCkv0c8eYObzibWXn9R6A7Yr_Fy7CW4dRFZm1HfcnUTEZ8xBYZDM-5zeTVk1tTgC1hp7d5YYw3o1&t=634308186300177825
All other servers URL
/WebResource.axd?d=yj6PW1hbOvqhMkOh2gYGlw2&t=634207187366247462
I have checked the web.config, machine.config for every server and they're all identical. The only difference been able to find so far is that prior to the problem commencing, the servers were patched, after which, the problematic server looks to be using different version of the System.Web.dll to the others?
in my ASP.NET app happen asynchronously (i.e in background threads without any access to HttpContext). Let me take an example of one such action. The app would be deployed to a web farm soon.
The background threads would be processing files deposited to a network share location. So, when the app starts, I create a FilesystemWatcher to monitor activities on the desired network share folder.
As soon as a new file arrives, the code processes it and marks it as completed processing.
The problem is with multiple servers watching the same network share, the same file might get processed on different machines, meaning redundant results. On a single server, I use locking mechanisms to prevent race conditions.
Now how to prevent the same on a web farm?
I have about 50 web-sites, load-balanced across 5 web-servers. They all use Enterprise Library Caching, and access the same Caching database. The items in the Caching database are refreshed every few hours, using an ICacheItemRefreshAction implementation.I want to guarantee that only one web-site ever refreshes the cache, by putting the refresh code in a critical section. If the web-sites were running in a single app-pool on a single server, I could use a lock()If the web-sites were running in separate app-pools on a single server, I could use a Mutex.However, these will not ensure the critical section across multiple web-servers.Currently, I am creating a new key in the caching database to act as a mutex. This will generally work, but I can see a slim chance that 2 processes could enter the critical section.
public class TakeLongTimeToRefresh : ICacheItemRefreshAction
{
#region ICacheItemRefreshAction Members
[code]...
I just stumbled across the concept of a "Web Garden" in an IIS App Pool. That is, when more than one process serves the same webpage. From what I understand, this means ASP.NET InProc sessions have the same problems as a web farm.
My question is, assuming your production environment is a web farm but your development/test environment is not, would it be to set up a "Web Garden" in dev/test? I'm thinking this would help catch any multi-process/server issues early on, or at least confirm that everything works as expected.
I need to deploy my application under web-farm. I have a following code:
[Code]....
Will it work under web-farm or not?
What changes are required in web.config file to configure Web Farm ?
View 1 RepliesI trying to understand how a server farm would use MembershipProvider / RoleProvider. If I have a million users, I do not want to have multiple copies of the MembershipProvider / RoleProvider database. I would like to have one set of machines used for login but then redirect users to other machines in the server farm depending applications the users decide to use. However, once they are redirected to the new machine, I do not want the user to have to relogin. I want the credentials and role information to be available.
Does anyone know how MembershipProvider / RoleProvider is configured for this type architecture?
We recently patched our 12 servers, now have been getting the following exceptions across all servers when hitting URL similar to this.(URL has been modified)
[code]...
I got the followig task.Create a website (Profile.aspx) in which the User can create and edit his profile.Well, I know how to write in a database, but how do I get the UserName oder the UserID to make a PrimaryKey?If the user is logged in a session will be started. In this session is the UserName but I don't know how to read out the UserName with ASP.NET to make an PrimaryKey. If I would try to read out the UserName with C# I must save it in an variable and give it somehow to my form.
asp:sqldatasource id="SqlDataSource1" runat="server"
connectionstring="<%$
ConnectionStrings:MyConnectionString %>"[code]....