ANCM installers should restart IIS

[mikeharder]

The ANCM installers (either the MSIs or the Hosting Bundle) should restart IIS to ensure IIS+ANCM will work correctly. Our docs currently recommend this as a manual step users must run:

Restart the system or execute net stop was /y followed by net start w3svc from a command prompt. Restarting IIS picks up a change to the system PATH, which is an environment variable, made by the installer.
https://docs.microsoft.com/en-us/aspnet/core/host-and-deploy/iis/?view=aspnetcore-2.1&tabs=aspnetcore2x#install-the-net-core-hosting-bundle

If IIS is not restarted after installing the Hosting Bundle, .NET Core sites will fail to start with the following event log (80070002 is file not found):

Application 'MACHINE/WEBROOT/APPHOST/DEFAULT WEB SITE' with physical root 'C:\inetpub\wwwroot\'
failed to start process with commandline 'dotnet .\app.dll', ErrorCode = '0x80070002 : 0.

This is a poor first-time experience if users forget to restart IIS, so I think our installers should do it automatically.

[joeloff]

ANCM MSIs already contains an action to restart IIS AFAIK.

[Tratcher]

Is that before or after dotnet.exe is added to the system PATH? Is the runtime installed before or after ANCM?

[rockerinthelocker]

Would be good to have a switch (UI + cmd) to prevent the installer from restarting IIS to allow hosting providers to handle the restart on their own.

[jkotalik]

This will not be in by preview2, pushing out to preview3.

[jkotalik]

Working on verification for this change.

[jkotalik]

The solution I made has two big issues that need to be resolved:

1. Installer fails to install if WAS isn't enabled (meaning it fails on azure).
2. We shouldn't always start WAS (if WAS is off, keep it off; if WAS is started, keep it started).

There should be a way to use IIS custom actions to do this.

For now, I'm going to revert the change: #3662 and talk with some people on the IIS side to figure out the right way to do this.

[muratg]

@shirhatti could you find out what IIS module that helps with this?