WebApp with Docker restart takes very long

Question

WebApp with Docker restart takes very long

Thorn Walli 1

As the title describes I have a problem with the duration when launching a WebApp with a Docker instance.

The creation of the Docker image and the loading of the WebApp is done in the Azure CI.

create a new build image.
replace it in the WebApp.
stop and restart the WebApp.

I would expect the instance to be available again after 10 minutes at the latest, but unfortunately I have to wait up to 30 minutes until I get something back via a browser call.

According to the log, the Docker instance starts, but somehow the routing of the domain to the Docker does not work.

What is the reason for this, is there a trick or a solution?

Lex Li (Microsoft) 6,037 Reputation points Microsoft Employee

2022-12-21T09:08:18.383+00:00

"somehow the routing of the domain to the Docker does not work" is rather vague. Do you know how to use a tool like Wireshark? With that you can capture the actual network packets at multiple locations and dig further to see what's the culprit. And without that nobody else can give you any insight on what might be wrong. If you work for a company with Microsoft support contracts, please open support cases to get assistance.

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Lex Li (Microsoft) 6,037 Reputation points Microsoft Employee

2022-12-21T09:08:18.383+00:00

"somehow the routing of the domain to the Docker does not work" is rather vague. Do you know how to use a tool like Wireshark? With that you can capture the actual network packets at multiple locations and dig further to see what's the culprit. And without that nobody else can give you any insight on what might be wrong. If you work for a company with Microsoft support contracts, please open support cases to get assistance.

Answer 1

@Thorn Walli We understand you are experiencing slow start ups of your Web App Docker Container.

We do agree with lextm that troubleshooting performance issues is one of the hardest things to do on a public forum. Without access to the web app's logs, we are left to make many assumptions.

One tool that I can say would be a good place to start is the diagnose and solve tool. This is the same tooling that support engineers use so it might help shed some light on your slow start ups.

Navigate to portal.azure.com
Select your web app
Navigate to the "diagnose and solve problems" blade
Check out the different reports. Ensure you have the timeframe selected to a time where a slow startup was encountered.

If this helps, great. If not, please reply back to here as there is a final item that could be used.

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WebApp with Docker restart takes very long

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