Sunday, February 08, 2009

Tips & Tricks: Difference between App Pool Mapping Vs App Pool Settings

Application Pool is an IIS concept and will apply to an application which uses IIS as its web server.  Learn how to make your web application to use IIS during development time by clicking here...  If you application is an IIS based application then you should be able to look at its basic settings as below:

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In this post I quickly wanted to discuss about the difference between App Pool Mapping and the actual App Pool Settings

  • App Pool Mapping - This is a setting limited to your web application in IIS...  This instructs IIS to identify the correct App Pool which your web application should run against.  It by no way changes any settings associated with the App Pool itself i.e. you are using an app pool which was pre-created/configured and essentially the settings of those app pool will now apply to you web application too...  I had earlier written a quick tip on how to change the App Pool used by your application which you can find here...
  • App Pool Settings - App Pool settings are stored in separate configuration file in IIS and they are manifested in IIS Manager UI as below:

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You can create, edit, delete App Pools for the machine using the above options... Although the important point to note is that the same app pool can be used by various applications on the same server and changing an App Pool setting will impact all the applications running on the server.

In anycase, if you would like to modify the App Pool Settings you can do so by clicking the "Edit Application Pool" settings as shown in the diagram above

Some of the Advanced settings which can be modified for an application pool are as shown in the figure below:

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So in nutshell, it is important to understand that when you change app pool settings on your developer box then they will not automatically reflect on the server unless it is explicitly modified.

Also the reason why server admins are reluctant to modify a particular app pool's settings on the server is coz it may impact many other applications on the server who are using the same app pool. 

Some server admins create different app pools for different webs to ensure that other applications on the server are not impacted by individual application change requests to the app pool.

Hope this helps...

3 comments:

Bita said...

you are amazing , thank you so much
this site is one of the most helpful sites that i've visited

Anonymous said...

I hope someday you create an article about when we need Load User Profile = True. Thank you.

OEE said...

Thanks a bunch!! Very informative :)