Azure App Service
Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
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Azure Linux App Service randomly restarts every couple of minutes
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Lukáš Fadrhons
0
Reputation points
Dear Team,
I belive you can kill my pain easily however I am a lost now.
My appliacation uses user login/password authorization and I observed that users are randomly logged out from webapp. I thought problem would be in my SESSION but then I noticed that ssh and whole app restarts, not only destroys session.
So I opted for HTTPS only, Always on and swiched of health check to see if thats not the source of the issue.
Even when I have only one active session the app restarts and as I keep an eye on response types they all are 200 so they should not restart the app.
Any help would be highly appreciated..
Thank you, with BRGDs,
Lukas
Azure App Service
{count} votes
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Ryan Hill 30,281 Reputation points Microsoft Employee Moderator2023-12-27T22:53:13.91+00:00 Hey @Lukáš Fadrhons for the community to assist, we need additional information about your configuration. Please utilize Diagnostics and solve tool - Azure App Service | Microsoft Learn and check the Web App Restarted diagnostic check as well as Web App Down and Web App Slow. This will reveal more diagnostic information as your application could be restarting for any number reasons, e.g., resource exhaustion, application error, dependency issues.
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Lukáš Fadrhons 0 Reputation points
2023-12-27T23:13:14.77+00:00 Hi Ryan. Thank you for your reply.
So Far Web App Down is none, Web App Slow shows couple of examples of 95 percentile_time_taken (as I am in preproduction testing stage I opted for more cost-efficient option but I can upscale if needed) and Webb App Restart results as shown on attachment. I do understand config changes results of restart (ex. HealthCheckUrlChange) but then AutoHeal signal when HealthCheck in off and [Start container] are not really obvious to me. Thank you once again
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Ryan Hill 30,281 Reputation points Microsoft Employee Moderator
2023-12-29T22:23:20.07+00:00 The
[Start container]is the platform attempting to start your application. What's odd is the image that's being loaded, or I should say images. Your app appears to be using two different images;mcr.microsoft.com/appsvc/middleware:stage5andappsvc/php:8.2-fpm_20231129.3.tuxprod. I don't know why this would be the case without more details about your environment. I would check for errors in your application via console logs. You can either use the Log Stream, under Monitoring section of your app service, or configure a diagnostic setting for App Service Console Logs to either a log analytics workspace or storage account. Any try/catch errors you're logging with console.log should show those destinations. -
Lukáš Fadrhons 0 Reputation points
2023-12-29T23:11:08.35+00:00 Hi,
Thank you for your time and response.
What I found is following:
The app is trying to connect to localhost for some reason but connection works to Mysql on Azure without any problem in resolving mysql commands.
After some period of time it restarts the container as shown below.
2023-12-29T23:02:54.021256781Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:02:54 +0100 "GET /file.php" 200
2023-12-29T23:02:54.130104515Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:02:54 +0100 "GET /file.php" 200
2023-12-29T23:02:57.875285872Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:02:57 +0100 "POST /ajax.php" 200
2023-12-29T23:03:02.511659690Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:02 +0100 "POST /ajax.php" 200
2023-12-29T23:03:06.479146072Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:06 +0100 "POST /ajax.php" 200
2023-12-29T23:03:10.511687818Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:10 +0100 "POST /ajax.php" 200
2023-12-29T23:03:14.549669406Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:14 +0100 "POST /ajax.php" 200
2023-12-29T23:03:18.479913363Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:18 +0100 "POST /ajax.php" 200
2023-12-29T23:03:22.482604551Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:22 +0100 "POST /ajax.php" 200
2023-12-29T23:03:26.411644362Z: [INFO] _____
2023-12-29T23:03:26.411703663Z: [INFO] / _ \ __________ _________ ____
2023-12-29T23:03:26.411711563Z: [INFO] / /\ \__ / | _ __ _/ __ \
2023-12-29T23:03:26.411716863Z: [INFO] / | / /| | /| | /\ ___/
2023-12-29T23:03:26.411721663Z: [INFO] _| /_____ _/ || ___ >
2023-12-29T23:03:26.411726663Z: [INFO] / / /
2023-12-29T23:03:26.411731663Z: [INFO] A P P S E R V I C E O N L I N U X
2023-12-29T23:03:26.411736563Z: [INFO]
2023-12-29T23:03:26.411741063Z: [INFO] Documentation: http://aka.ms/webapp-linux
2023-12-29T23:03:26.411745563Z: [INFO] PHP quickstart: https://aka.ms/php-qs
2023-12-29T23:03:26.411750063Z: [INFO] PHP version : 8.2.9
2023-12-29T23:03:26.411754463Z: [INFO] Note: Any data outside '/home' is not persisted
2023-12-29T23:03:26.509592756Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:26 +0100 "POST /ajax.php" 200
2023-12-29T23:03:27.989715024Z: [INFO] Starting OpenBSD Secure Shell server: sshd.
2023-12-29T23:03:28.033231400Z: [INFO] Running oryx create-script -appPath /home/site/wwwroot -output /opt/startup/startup.sh -bindPort 8080 -startupCommand '/home/site/startup.sh; php-fpm;'
2023-12-29T23:03:28.112435247Z: [INFO] Could not find build manifest file at '/home/site/wwwroot/oryx-manifest.toml'
2023-12-29T23:03:28.112472447Z: [INFO] Could not find operation ID in manifest. Generating an operation id...
2023-12-29T23:03:28.112479047Z: [INFO] Build Operation ID: 9895d1e6-7797-4379-bbcd-d2a7488311da
2023-12-29T23:03:28.822078429Z: [INFO] Writing output script to '/opt/startup/startup.sh'
2023-12-29T23:03:29.298791132Z: [INFO] Starting nginx: nginx.
2023-12-29T23:03:29.672627074Z: [INFO] Reloading nginx configuration: nginx.
2023-12-29T23:03:30.071204144Z: [ERROR] [30-Dec-2023 00:03:30] NOTICE: fpm is running, pid 101
2023-12-29T23:03:30.074842192Z: [ERROR] [30-Dec-2023 00:03:30] NOTICE: ready to handle connections
2023-12-29T23:03:30.767844954Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:30 +0100 "POST /ajax.php" 200
2023-12-29T23:03:30.161653440Z: [INFO] Updated CA certificates
2023-12-29T23:03:34.466638256Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:34 +0100 "POST /ajax.php" 200
2023-12-29T23:03:38.499118548Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:38 +0100 "POST /ajax.php" 200
2023-12-29T23:03:44.449640380Z: [ERROR] NOTICE: PHP message: PHP Warning: Undefined array key "HTTP_X_FORWARDED_PROTO" in /home/site/wwwroot/public/index.php on line 107
2023-12-29T23:03:44.570720250Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:44 +0100 "GET /index.php" 200
2023-12-29T23:03:44.728773698Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:44 +0100 "GET /index.php" 200
2023-12-29T23:03:44.731373232Z: [ERROR] NOTICE: PHP message: PHP Warning: Undefined array key "HTTP_X_FORWARDED_PROTO" in /home/site/wwwroot/public/index.php on line 107
2023-12-29T23:03:42.510277041Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:42 +0100 "POST /ajax.php" 200
2023-12-29T23:03:47.437570009Z: [ERROR] NOTICE: PHP message: PHP Warning: Undefined array key "AIR_userid" in /home/site/wwwroot/inc/classes/functions.php on line 794
2023-12-29T23:03:47.487681959Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:46 +0100 "POST /ajax.php" 200
2023-12-29T23:03:50.426277648Z: [ERROR] NOTICE: PHP message: PHP Warning: Undefined array key "AIR_userid" in /home/site/wwwroot/inc/classes/functions.php on line 794
2023-12-29T23:03:50.454089408Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:50 +0100 "POST /ajax.php" 200
2023-12-29T23:03:54.452696721Z: [ERROR] NOTICE: PHP message: PHP Warning: Undefined array key "AIR_userid" in /home/site/wwwroot/inc/classes/functions.php on line 794
2023-12-29T23:03:54.489600006Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:03:54 +0100 "POST /ajax.php" 200
2023-12-29T23:04:32.732515406Z: [ERROR] NOTICE: PHP message: PHP Warning: Undefined array key "AIR_userid" in /home/site/wwwroot/inc/classes/functions.php on line 794
2023-12-29T23:04:32.768194011Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:04:32 +0100 "POST /ajax.php" 200
2023-12-29T23:04:33.813820244Z: [ERROR] NOTICE: PHP message: PHP Warning: Undefined array key "AIR_userid" in /home/site/wwwroot/inc/classes/functions.php on line 794
2023-12-29T23:04:33.847764634Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:04:33 +0100 "POST /ajax.php" 200
2023-12-29T23:04:34.196044909Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:04:34 +0100 "GET /index.php" 302
2023-12-29T23:04:34.427886689Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:04:34 +0100 "GET /index.php" 200
2023-12-29T23:04:34.574678043Z: [ERROR] 127.0.0.1 - 30/Dec/2023:00:04:34 +0100 "GET /file.php" 200
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Ryan Hill 30,281 Reputation points Microsoft Employee Moderator
2024-01-02T22:17:47.2266667+00:00 I suggest focusing in on
[ERROR] 127.0.0.1 - 30/Dec/2023:00:03:42 +0100 "POST /ajax.php" 200. It seems like there repeated requests to that page/endpoint that results in some sort of error. I would still add try/catch blocks on that page and write the messages out to console to help further isolate the error. The constant reported errors could be placing your app in an unstable state that's leading to the restart. -
Lukáš Fadrhons 0 Reputation points
2024-01-02T23:48:45.6266667+00:00 Hi Ryan,
The thing is that I am not sure why there is such an error. It is caused by ajax function which runs in background so I dont see the errors by default and the ones after container restart are straight forward, the application is missing userid, that I can fix to not be evaluated as error. But the one before container restart are just response 200 which is OK because there is a ajax function which repeats every 4s and it logs as expected and it works as expected as well. When I run the same application on apache it doesn't produce such error or misbehavior. I would expect it could be my rewrite rules in nginx but once again, the ajax functions works as a expected so it's but the case.
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Ryan Hill 30,281 Reputation points Microsoft Employee Moderator
2024-01-04T21:31:30.1233333+00:00 Can you post your application name? Feel free to send it AzCommunity[at]microsoft[dot]com ATTN: Ryan so I can take closer look.
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