Does IIS automatically recyclea worker process which has been deemed as unhealthy?
we can configure to recycle based on our needs.
http://technet.microsoft.com/en-us/library/cc753179(v=WS.10).aspx
http://www.iis.net/ConfigReference/system.applicationHost/applicationPools/add/recycling/periodicRestart
http://technet.microsoft.com/en-us/library/cc725836(v=WS.10).aspx
Related
If I make changes to anything under the Features View for a website in IIS, do I need to
recycle the AppPool to get those changes to take effect
for any browsers already opened to that website should the tab be closed or a new tab be opened, or does the browser should be closed and reopened to see those changes?
I would like to the difference between iisreset, AppPool Start/stop, AppPool Recycle, and Website Restart options? Is there a good recommendation where I can read about this?
iisreset: stop and start the World Wide Web Publishing Service.
AppPool Start/stop:
start: starting an application pool enables IIS worker processes to be created to serve requests in that pool.
stop: instruct all IIS worker processes serving this application pool to shut down, and prevent any additional worker processes from being started until the application pool is started again
AppPool Recycle: IIS will create a new process (keeping the old one) to serve requests.
Website Restart: stop and restart serving requests for that particular website.
I have a website in IIS 8.5.9600.16384, we communicate with thousands of mobile devices through cyclic synchronisation and through SignalR 2.3.0.
This morning we had an application pool reset during working hours, which caused the SignalR to call "OnReconnect" of all our mobile devices at the same time.
I though that IIS started new processes first and then killed the old, not having downtime.
Can somebody tell me exactly what happens when IIS recycles it's application pool on the SignalR side? And in which cases can there be a connection downtime? (ex : if the server is busy?)
Edited : The application pool was recycled by IIS because of the "time limit". The IT team will change this setting so that the application pools reset every day at night time when it will have a lower impact on our applications.
A worker process with process id of '8720' serving application pool 'DefaultAppPool' has requested a recycle because the worker process reached its allowed processing time limit.
Also confirmed that disallowOverlappingRotation is not set to True. Any hint would help.
A few years later, I'm still getting some problems with the application pool recycle and SignalR. We are occasionally seeing thousands of re-connections of SignalR while the application pool recycle occurs, opening more than 60k TCPIP ports and causing a crash in IIS.
We managed to have it run "okay" for quite some time but it still crashes. Any hint would help. thanks
I'd first identify how IIS was reset. If you experienced a crash or performed an IISReset, the processes would be down before a new one stood back up. If on the other hand you configured AppPool recycling, then the overlapping processes should occur as you mention. I would check the System Event Log for recycling messages. Note that not all recycle reasons are logged by default.
You may also check to make sure disallowOverlappingRotation is not set to True.
Specifies whether the WWW Service should start another worker process to replace the existing worker process while that process is shutting down. The value of this property should be set to true if the worker process loads any application code that does not support multiple worker processes.
https://learn.microsoft.com/en-us/iis/configuration/system.applicationhost/applicationpools/add/recycling/
I have a doubt on IIS 6.0 worker process and Application pool.
I am having two web application which is been hosted on IIS 6.0 with different port number. Also I am created and assigned an Application pool to that applications. That application pool has configured for 2 worker process. Now what is my question is? when I am running that two applications from the browser, How that application pool will handle them? whether that two worker process will be assigned to one application or both.?
Please share your idea...
Thanks in Advance...
The worker processes are specific to each application pool. If you specify one application pool to have 1 worker process it will have only 1 worker process. If you specify another application pool to have 2 worker processes it will have 2 worker processes. You should notice that the properties screen is specific to an app pool.
You can see which application pools are using which worker processes using the following process;
• Start > Run > Cmd
• Go To Windows > System32
• Run cscript iisapp.vbs
• You will get the list of Running Worker ProcessID and the Application Pool Name.
You should see that if one of your app pools is set to use 2 worker processes it will have two entries in the list against the same app pool name.
Instructions and reference for above and also listing running worker processes in IIS7.
How do stop application pools from recycling in IIS 7.5?
I have configured the following settings:
ProcessModel -> Idle Time-out (minutes) = 0
Recycling -> Regular Time Intervals (minutes) = 0
Are these settings enought to stop an application pool from recycling?
Yes, that should be ok assuming you also use Private Memory Limit = 0.
There are still reasons an AppPool could recycle, such as when adding a new Global Module, it will require to be recycled so configuration changes take effect, but you can also disable that using the "Disable Recycling on Configuratoin Changes".
Finally if you are running ASP.NET you should consider that still AppDomains will recycle when changes in config (such as web.config) happen. But that should not affect the AppPool per'se only the ASP.NET applications running in it (such as Session State), but again it depends on why you ask this question if this is important or not.
In my IIS log, I found warning level event ID 1013, which says the stop time exceeds expected stop time for worker process of a specific web application.
My question is, how could I know or track from what reason IIS worker process stops? Does this warning level event ID means worker process application pool is stopped or not?
thanks in advance,
George
If you application is an ASP.NET (2.0 or newer) you can turn on health monitoring which shoudl record details including IIS applciation pool resets.
Useful links
MSDN
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