App Services returning 503 - no memory or CPU issues

Question

App Services returning 503 - no memory or CPU issues

MichaelM 21

My App Service instances (NodeJS 10) have started returning HTTP 503 errors. The log stream is unavailable and there are no diagnostics available. Even the git repo URL is down. Memory working set (when last working) is below 180MB. NOt much more detail to share as there are no logs coming through.

This happens for two distinct App Service Apps (both NodeJS). I have restarted both to no effect. Metric don't show any server errors. This had been working up until 12 Dec. The very same apps ran on Gcloud with no issues.

Base URL: https://spreeappapi.azurewebsites.net

Ajay Kumar N 28,266 Reputation points Microsoft Employee Moderator

2020-12-14T08:25:33.417+00:00

@MichaelM , Thanks for posting the question and sharing great details about the issue.

I'm checking on this internally with our product engineering team and will get back to you shortly.

Apologies for any inconvenience this issue may have caused.
Ajay Kumar N 28,266 Reputation points Microsoft Employee Moderator

2020-12-14T09:29:38.097+00:00

@MichaelM , The issue is mitigated now. Kindly check and let us know if you any further questions.

I understand it is inconvenient, once again sorry for the trouble, I have shared the feedback with our product team.

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Ajay Kumar N 28,266 Reputation points Microsoft Employee Moderator

2020-12-14T08:25:33.417+00:00

@MichaelM , Thanks for posting the question and sharing great details about the issue.

I'm checking on this internally with our product engineering team and will get back to you shortly.

Apologies for any inconvenience this issue may have caused.
Ajay Kumar N 28,266 Reputation points Microsoft Employee Moderator

2020-12-14T09:29:38.097+00:00

@MichaelM , The issue is mitigated now. Kindly check and let us know if you any further questions.

I understand it is inconvenient, once again sorry for the trouble, I have shared the feedback with our product team.

Answer 1

Ajay Kumar N 28,266 Microsoft Employee Moderator

@MichaelM , Following-up, sharing an update:

Summary of impact: Between 00:00 UTC on 12 Dec 2020 and 07:25 UTC on 14 Dec 2020, you were identified as a customer using Azure App Service who may have been unable to deploy site content through your kudu portal.

Preliminary root cause: We identified that a recent deployment task as the potential root cause, causing a required container image to be unavailable.

Mitigation: We replicated the container image in a fallback registry to mitigate the incident

Next steps: We will continue to investigate to establish the full root cause and prevent future occurrences.

You may stay informed about Azure service issues by creating custom service health alerts: https://aka.ms/ash-videos for video tutorials and https://aka.ms/ash-alerts for how-to documentation.

Your co-operation and patience with this matter is much appreciated. Thanks!

WebApp load fine:

Ajay Kumar N 28,266 Reputation points Microsoft Employee Moderator

2020-12-15T19:05:11.497+00:00
Just highlighting more info (for fixing app takes a while to load at the start), I see that your app runs on Free Linux and Always On feature is disabled. In Basic or Standard mode, you can enable Always On to keep the app loaded all the time.

Based on your requirement you may consider scaling-up to a next higher tier. Your App Service Plan (ASP) can be scaled up and down at any time by changing the pricing tier of the plan. I would suggest you start with lower pricing tier (Basic) at first and scale up (Standard) later when you need more App Service features.

Also, when you feel you no longer need the capabilities or features of a higher tier, you can scale down to a lower tier, which saves you money.

From WebApp in Azure Portal> Click on Diagnose and Solve Problems blade > Best Practices and Click on Best Practices for Availability, Performance

Detectors would analyze your App Service
MichaelM 21 Reputation points

2020-12-19T09:22:09.653+00:00

Thank you for following up and for the advice! Happy to accept.

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App Services returning 503 - no memory or CPU issues

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