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App Service starting new containers - why?

Rodney Tamblyn 0 Reputation points
2024-05-21T04:42:17.4033333+00:00

Hi Azure team:

We have an a web app running in App Service. Recently I have noticed that Azure is replacing container instances frequently (every few hours). I have monitor configured to Alert on health check and scale out operations but am not receiving any notifications. I am also checking locally against our health check endpoint every 5 minutes and have only received 200/healthy replies so it doesn't appear to be health check. I have turned off scale out, but the container replacement continues to happen.

Can you provide any explanation or suggestion of next steps to investigate?

Rodney

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  1. brtrach-MSFT 15,786 Reputation points Microsoft Employee
    2024-05-23T00:11:38.2833333+00:00

    @Rodney Tamblyn There is likely an update going on. App Service works within update zones. Zone 1 will be taken offline to be updated. Any sites in zone 1 will be moved to zones 2-10. If your site was moved to zone 2, it will be moved again upon zone 2 starting its update and so forth.

    Are you experiencing any issues due to the change of instance or are you curious about the cause of the behavior?

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