How to set up memory limit for docker in web app

Question

How to set up memory limit for docker in web app

Anonymous

Hello
I'm using docker container in azure web app.
Right now I need to limit the RAM consumption of the docker process.
How can i set up RAM limit in azure web app if i can't use docker run with flags in web app

brtrach-MSFT 17,731 Reputation points Microsoft Employee Moderator

2023-09-11T01:57:38.86+00:00

@Anonymous Please let us know if you find the answers helpful by accepting them as the answer. If you need further assistance, please reply here so we can assist you.
Anonymous

2023-09-12T10:49:05.9433333+00:00

I'm checking the answers that were given right now.
Thanks everyone very much for the answers, as soon as I check them - I will definitely write back here
brtrach-MSFT 17,731 Reputation points Microsoft Employee Moderator

2023-09-19T02:43:09.3966667+00:00

@Anonymous Just wanted to check in as the answers appeared to be helpful. If you found one or more of the answers helpful, marking them as an answer will provide credit to the member for their time and effort. Thank you

2 answers

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brtrach-MSFT 17,731 Reputation points Microsoft Employee Moderator

2023-09-11T01:57:38.86+00:00

@Anonymous Please let us know if you find the answers helpful by accepting them as the answer. If you need further assistance, please reply here so we can assist you.
Anonymous

2023-09-12T10:49:05.9433333+00:00

I'm checking the answers that were given right now.
Thanks everyone very much for the answers, as soon as I check them - I will definitely write back here
brtrach-MSFT 17,731 Reputation points Microsoft Employee Moderator

2023-09-19T02:43:09.3966667+00:00

@Anonymous Just wanted to check in as the answers appeared to be helpful. If you found one or more of the answers helpful, marking them as an answer will provide credit to the member for their time and effort. Thank you

Answer 1

AirGordon 7,150

You need to provide an additional AppSetting in the site configuration to override the default.

It is limited by the memory available on the App Service host from your selected SKU (P0v3, 4 GiB and P1v3, 8 GiB).

You need to provide the value in MB.

Here's an ARM infrastructure as code file which shows exactly how to set the memory (and lots of other parameters); https://github.com/MaxMelcher/mevitco.profile.runtime/blob/da4a37a2fa83a8cc1f59c0957ca9ce72457341d9/mainTemplate.json#L178

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Anonymous

2023-09-13T13:01:56.0033333+00:00

Thanks for answer,
Do I need change it manually? It looks like the documentation says nothing about this at all.
AirGordon 7,150 Reputation points

2023-09-13T20:16:23.0733333+00:00

You need to set it explicitly. The docs aren't great.
The GitHub ARM file i shared provides a complete solution.
Dan Rios 2,020 Reputation points MVP

2023-09-13T20:24:55.98+00:00

I think this is for Azure App Service and not the Static Web App. The SKU in the ARM template is not available in static web apps as far as I’m aware which OP seems to be using going by his question tag
AirGordon 7,150 Reputation points

2023-09-14T07:03:26.61+00:00

Agreed. Although the question did infer App Service 😊

using docker container in azure web app
Anonymous

2023-09-14T09:16:21.44+00:00

Oh, my mistake, I was looking for Azure web app hashtag but I didn't find it

Answer 2

Dan Rios 2,020 MVP

By default all Windows Containers deployed in Azure App Service are limited to 1GB RAM. You can change this value by providing the following setting as an app setting - CONTAINER_MEMORY: defined in MB and must be <= to the total physical memory of the host.

https://github.com/Azure/app-service-windows-containers/wiki/things-you-should-know#all-containers-have-1gb-ram-assigned-by-default-but-you-can-configure-this-setting

Have you tried the app config value from above? Not sure if you’re using Linux or Windows but it should help you out. Hope this helps.

Anonymous

2023-09-13T12:59:20.9033333+00:00

Thanks for the answer, this seems to be what I need.

I wanted to ask: do I understand correctly that I should add this to the Application settings and it will work?
I've tried add this parament but seems like nothing changed or did i smth wrong?
P.S.
I'm using Linux
thanks
Dan Rios 2,020 Reputation points MVP

2023-09-13T13:19:09.1233333+00:00

I just deployed my own Static App and having the same issue. Static web apps are quite a basic resource so it’s possible this is only applicable to azure apps instead (different azure offering).

I’ve checked the GitHub docs and issues and cannot find further reference to this app setting in static apps specifically, rather it gets mentioned mostly for Azure Apps service instead.

Is there a particular use case for why you need to limit memory? Just curious really, there is a free azure app tier too if that’s worth exploring for your needs.
Anonymous

2023-09-13T18:53:51.3033333+00:00

This is workaround for getting rid of zombie processes on a instance.
If the instance crashes with an OOM error, then the Python webservice turns into a zombie process.
So If I set a limit on a container, then during OOM, the container will kill all processes, including zombie processes,at the same time, there will be no problems with the instance since it will have free memory for running system processes
Dan Rios 2,020 Reputation points MVP

2023-09-13T18:57:44.5466667+00:00

Gotcha. Does the OOM error appear in app insights or any other logs? Maybe triggering a runbook to restart the problematic instance is a possibility
Anonymous

2023-09-14T06:52:04.27+00:00

Yes, this can be seen from the memory consumption, and from the fact that the service begins to issue a 502 error
Anyway, Thanks for you thoughts, it is really useful for me
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How to set up memory limit for docker in web app

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