I have an Azure Container App that is just one replica and one container. Roughly once a week or so, the container resets itself and I have to recreate my directories and reinstall all my packages again. Historically, it would only happen in the middle of the night. But today, it happened at around 15:47 UTC or 7:47am Pacific time which can be catastrophic for my use case. Under Diagnose and Solve Problems > Availability and Performance, my CPU usage and memory usage are well below the high usage warnings and my replica restart count has never been anything other than 0. Why is this happening and how can we prevent it from happening again in the future?

Hi @William Huynh , I understand that you have an Azure Container Apps and found that it restarts itself regularly, which causes you to lose your directory and packages. First, regarding restarting itself. Please note that Azure Container Apps restart regularly, so don't expect state to persist inside a container. Azure Container Apps has a Container-scoped storage (its own files system). Container file system storage has the following characteristics: The storage is temporary and disappears when the container is shut down or restarted. Files written to this storage are only visible to processes running in the current container. You should include all necessary files/directories and installed packages in the container image, then deploy the container image into Azure Container Apps. If you need a persistent storage, you can mount an Azure Files volume to your Container Apps. More info: Azure Files volume for Azure Container Apps . Please accept an answer if correct. Original posters help the community find answers faster by identifying the correct answer. Here is how .

Why does my Azure Container App reset itself randomly?

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Silvia Wibowo 3,411 Reputation points Microsoft Employee

2024-02-27T18:48:23.4566667+00:00
Hi @William Huynh , I understand that you have an Azure Container Apps and found that it restarts itself regularly, which causes you to lose your directory and packages.

First, regarding restarting itself. Please note that Azure Container Apps restart regularly, so don't expect state to persist inside a container.

Azure Container Apps has a Container-scoped storage (its own files system). Container file system storage has the following characteristics:

The storage is temporary and disappears when the container is shut down or restarted.

Files written to this storage are only visible to processes running in the current container.

You should include all necessary files/directories and installed packages in the container image, then deploy the container image into Azure Container Apps.

If you need a persistent storage, you can mount an Azure Files volume to your Container Apps. More info: Azure Files volume for Azure Container Apps.

Please accept an answer if correct. Original posters help the community find answers faster by identifying the correct answer. Here is how.
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William Huynh 20 Reputation points

2024-02-27T19:21:51.25+00:00

Hi @Silvia Wibowo , thanks for your reply. I should have mentioned in my original post that what's most important to me is to keep my long running process (at least 1 week) running. Or at least be aware ahead of time when these restarts are going to happen. How should I go about doing this? In the future, I do plan to create a container image for my project. But it's not as big deal to manually set up my container again nor is persistent storage previously suggested.

William Huynh 20 Reputation points

2024-02-27T19:27:16.44+00:00

Edit: Disregard this post. My original comment appeared to be lost and never posted but then posted the same time after I had to rewrite my comment

Silvia Wibowo 3,411 Reputation points Microsoft Employee

2024-02-27T20:02:16.11+00:00

Hi @William Huynh , please consider using Azure Container Instance that has restart policy.

William Huynh 20 Reputation points

2024-02-28T03:55:07.6833333+00:00

I had previously tried to work with Azure Container Instance a couple months ago but was never able to prevent the container from shutting down as soon as it started with the same image as my Azure Container App (https://mcr.microsoft.com/k8se/quickstart:latest) even with the restart policy set to "Never". But I just gave it another chance as you suggested and it appears to be working now. Thanks, Silvia!

William Huynh 20 Reputation points

2024-02-28T03:55:20.7433333+00:00

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William Huynh 20 Reputation points

2024-03-15T22:45:28.2266667+00:00

@Silvia Wibowo Things have been going great with the Azure Container instance since my last message. However, my Azure Container Instance has now reset just by itself for the first time about 3 hours ago even though its restart policy was set to never. Why is this? Is it also subject to intermittent restarts?

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Silvia Wibowo 3,411 Reputation points Microsoft Employee

2024-03-17T22:02:32.7966667+00:00

Hi @William Huynh , your container groups may restart due to platform maintenance events. These maintenance events are done to ensure the continuous improvement of the underlying infrastructure: Container had an isolated restart without explicit user input

Source: Azure Container Instances Considerations

William Huynh 20 Reputation points

2024-05-28T16:15:30.71+00:00

@Silvia Wibowo The links you provided suggest Application Gateway or Traffic Manager as solutions to keep my application available to route my users' requests to another container. However, My application does not have users making requests to any of my endpoints. Instead, it receives a constant stream of data via HTTP stream from someone else's endpoint. How do I ensure the stream does not get interrupted from a maintenance event? Thank you

William Huynh 20 Reputation points

2024-05-28T16:15:43.8366667+00:00

@Silvia Wibowo The links you provided suggest Application Gateway or Traffic Manager as solutions to keep my application available to route my users' requests to another container. However, My application does not have users making requests to any of my endpoints. Instead, it receives a constant stream of data via HTTP stream from someone else's endpoint. How do I ensure the stream does not get interrupted from a maintenance event? Thank you

Silvia Wibowo 3,411 Reputation points Microsoft Employee

2024-05-29T02:19:44.73+00:00

Hi @William Huynh , would Event Hubs help?
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Why does my Azure Container App reset itself randomly?

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