IIS Application Pools for ASP.NET Apps

IIS Application Pools allow for grouping of similar or related applications to facilitate easy management and configuration. Each application assigned to an application pools (or app pool) is isolated from other apps so that issues in one pool do not impact apps in other pools. Applications which have similar performance profiles or which belong to the same department in the business can be grouped together.

IIS 7 automatically creates serveral application pools, including the default app pool which is used  when you create a new application. When you create  a new application, it is automatically  assigned to the default application pool (DefaultAppPool), and a previously deployed app can have its application pool changed (for a varierty of reasons such as to enable it to use a newer version of the .NET framework). Application pools can be created and managed  using IIS . In the IIS Management Console expand the server and select Application Pools. This lists the app pools currently set up on the server as shown below:

IIS Application Pools

Application pools set up in IIS

The application pool listing displays most of the key characteristics of each app pool:

  • Name : The name of the application pool which cannot be changed after it has been created.
  • Status : Whether the application pool is running or stopped.
  • .NET Framework Version : The .NET Framework version  which will  execute the code.
  • Managed Pipeline Mode : IIS  supports Integrated and Classic pipeline modes for handling requests.
  • Identity : The Windows account which runs the apps  in the pool.
  • Applications : The number of applications running in the pool.

Creating a New Application Pool

Create a custom application pool by  clicking the  Add Application Pool link from the right hand panel of the Application Pools screen.
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