I have IIS 7.5 and I have installed the Application Initialization Module for it. Now, I am trying to change the StartMode of an application pool, but do not see the StartMode option in the IIS Manager. I have looked under Basic and Advanced Settings. I am thinking that the next place to edit this value would be in the Machine.Config. So, I have found that file, but I am unsure where the update would be placed in there. I believe it should be set to AlwaysRunning.
Any help would be appreciated.
I found the Configuration Editor under the Management section of the IIS manager.
EDIT: startMode is in section system.applicationHost/applicationPools under applicationPoolDefaults. It can also be configured on a per-item basis in Application Pools - Advanced Settings.
In this entry http://developers.de/blogs/damir_dobric/archive/2009/10/11/iis-7-5-and-always-running-web-applications.aspx i found the answer.
To setup the pool set the attribute startMode to AlwaysRunning of the IIS config file C:\Windows\System32\inetsrv\config\applicationHost.config:
<applicationPools>
<add name="MyAppWorkerProcess" managedRuntimeVersion="v4.0" startMode="AlwaysRunning" />
</applicationPools>
And you need implements others things to reach that your App always running
If you like to have a UI, look at this link https://blogs.msdn.microsoft.com/amol/2013/01/25/application-initialization-ui-for-iis-7-5/ and download the "ApplicationInitializationInstaller_x64.zip". after install you find a new icon on the iis-manager (on the server-element).
来源：https://stackoverflow.com/questions/24124355/iis-7-5-change-application-pool-start-mode-to-always-running