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Flask in Azure App Server

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Hello,

I am trying to deploy a flask project on Azure App Server. I have followed the official guide which worked successfully when using a sample flask project.

I have my own flask project, which runs perfectly locally on my computer. When I try to deploy it on Azure, I get the following following error log. I believe this may have to do with the Azure Linux Server and the library availability.

2019-01-26T22:34:23  Welcome, you are now connected to log-streaming service.
2019-01-26T22:34:20.331135452Z 
2019-01-26T22:34:20.331181753Z   _____                               
2019-01-26T22:34:20.331188153Z   /  _  \ __________ _________   ____  
2019-01-26T22:34:20.331192053Z  /  /_\  \___   /  |  \_  __ \_/ __ \ 
2019-01-26T22:34:20.331195853Z /    |    \/    /|  |  /|  | \/\  ___/ 
2019-01-26T22:34:20.331199653Z \____|__  /_____ \____/ |__|    \___  >
2019-01-26T22:34:20.331203453Z         \/      \/                  \/ 
2019-01-26T22:34:20.331207253Z 
2019-01-26T22:34:20.331210553Z A P P   S E R V I C E   O N   L I N U X
2019-01-26T22:34:20.331214053Z 
2019-01-26T22:34:20.331217453Z Documentation: http://aka.ms/webapp-linux
2019-01-26T22:34:20.331221053Z 
2019-01-26T22:34:20.739564167Z Starting OpenBSD Secure Shell server: sshd.
2019-01-26T22:34:20.797187397Z Running python /usr/local/bin/entrypoint.py
2019-01-26T22:34:21.054346173Z executing:
2019-01-26T22:34:21.054492773Z python --version
2019-01-26T22:34:21.074927019Z Python 3.7.1
2019-01-26T22:34:21.075079919Z executing:
2019-01-26T22:34:21.075200919Z pip --version
2019-01-26T22:34:24.945566790Z pip 10.0.1 from /home/site/wwwroot/antenv/lib/python3.7/site-packages/pip (python 3.7)
2019-01-26T22:34:24.959886222Z found flask app
2019-01-26T22:34:24.960399124Z executing:
2019-01-26T22:34:24.960509524Z . antenv/bin/activate
2019-01-26T22:34:24.969337544Z 
2019-01-26T22:34:24.969526444Z executing:
2019-01-26T22:34:24.969647744Z GUNICORN_CMD_ARGS="--bind=0.0.0.0 --timeout 600" gunicorn app:app
2019-01-26T22:34:25.955266152Z [2019-01-26 22:34:25 +0000] [35] [INFO] Starting gunicorn 19.9.0
2019-01-26T22:34:25.956385255Z [2019-01-26 22:34:25 +0000] [35] [INFO] Listening at: http://0.0.0.0:8000 (35)
2019-01-26T22:34:25.956628655Z [2019-01-26 22:34:25 +0000] [35] [INFO] Using worker: sync
2019-01-26T22:34:25.967108279Z [2019-01-26 22:34:25 +0000] [38] [INFO] Booting worker with pid: 38
2019-01-26T22:34:31.286154295Z [2019-01-26 22:34:31 +0000] [38] [ERROR] Exception in worker process
2019-01-26T22:34:31.286179196Z Traceback (most recent call last):
2019-01-26T22:34:31.286183396Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/arbiter.py", line 583, in spawn_worker
2019-01-26T22:34:31.286188996Z     worker.init_process()
2019-01-26T22:34:31.286192496Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/workers/base.py", line 129, in init_process
2019-01-26T22:34:31.286196096Z     self.load_wsgi()
2019-01-26T22:34:31.286199396Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/workers/base.py", line 138, in load_wsgi
2019-01-26T22:34:31.286202996Z     self.wsgi = self.app.wsgi()
2019-01-26T22:34:31.286213896Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/app/base.py", line 67, in wsgi
2019-01-26T22:34:31.286217796Z     self.callable = self.load()
2019-01-26T22:34:31.286221096Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 52, in load
2019-01-26T22:34:31.286224396Z     return self.load_wsgiapp()
2019-01-26T22:34:31.286227796Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 41, in load_wsgiapp
2019-01-26T22:34:31.286231196Z     return util.import_app(self.app_uri)
2019-01-26T22:34:31.286234396Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/util.py", line 350, in import_app
2019-01-26T22:34:31.286237796Z     __import__(module)
2019-01-26T22:34:31.286241096Z   File "/home/site/wwwroot/app.py", line 12, in <module>
2019-01-26T22:34:31.286244996Z     import pyodbc
2019-01-26T22:34:31.286248196Z ImportError: libodbc.so.2: cannot open shared object file: No such file or directory
2019-01-26T22:34:31.286572596Z [2019-01-26 22:34:31 +0000] [38] [INFO] Worker exiting (pid: 38)
2019-01-26T22:34:31.421384098Z [2019-01-26 22:34:31 +0000] [35] [INFO] Shutting down: Master
2019-01-26T22:34:31.421588799Z [2019-01-26 22:34:31 +0000] [35] [INFO] Reason: Worker failed to boot.
2019-01-26T22:34:31.532032946Z 

2019-01-26 22:34:32.507 ERROR - Container testnumber3_0 for site testnumber3 has exited, failing site start
2019-01-26 22:34:34.539 INFO  - Starting container for site
2019-01-26 22:34:34.542 INFO  - docker run -d -p 36997:8000 --name testnumber3_0 -e WEBSITE_SITE_NAME=testNumber3 -e WEBSITE_AUTH_ENABLED=False -e WEBSITE_ROLE_INSTANCE_ID=0 -e WEBSITE_INSTANCE_ID=4e627c158a787ef098d2fc64fac1aa1045efbce9cf4366b0fb867333237b2444 appsvc/python:3.7_1811301405  

2019-01-26 22:34:34.542 INFO  - Logging is not enabled for this container.
Please use https://aka.ms/linux-diagnostics to enable logging to see container logs here.
2019-01-26T22:34:35.883529595Z 
2019-01-26T22:34:35.883584395Z   _____                               
2019-01-26T22:34:35.883589695Z   /  _  \ __________ _________   ____  
2019-01-26T22:34:35.883593395Z  /  /_\  \___   /  |  \_  __ \_/ __ \ 
2019-01-26T22:34:35.883597195Z /    |    \/    /|  |  /|  | \/\  ___/ 
2019-01-26T22:34:35.883600796Z \____|__  /_____ \____/ |__|    \___  >
2019-01-26T22:34:35.883604696Z         \/      \/                  \/ 
2019-01-26T22:34:35.883608296Z 
2019-01-26T22:34:35.883611696Z A P P   S E R V I C E   O N   L I N U X
2019-01-26T22:34:35.883615196Z 
2019-01-26T22:34:35.883618696Z Documentation: http://aka.ms/webapp-linux
2019-01-26T22:34:35.883622096Z 
2019-01-26T22:34:36.058281587Z Starting OpenBSD Secure Shell server: sshd.
2019-01-26T22:34:36.079592835Z Running python /usr/local/bin/entrypoint.py
2019-01-26T22:34:36.204711115Z executing:
2019-01-26T22:34:36.204728415Z python --version
2019-01-26T22:34:36.207442321Z Python 3.7.1
2019-01-26T22:34:36.207584421Z executing:
2019-01-26T22:34:36.207693122Z pip --version
2019-01-26T22:34:38.938546840Z pip 10.0.1 from /home/site/wwwroot/antenv/lib/python3.7/site-packages/pip (python 3.7)
2019-01-26T22:34:38.954654776Z found flask app
2019-01-26T22:34:38.955657578Z executing:
2019-01-26T22:34:38.955787278Z . antenv/bin/activate
2019-01-26T22:34:38.975853723Z 
2019-01-26T22:34:38.976014224Z executing:
2019-01-26T22:34:38.976132324Z GUNICORN_CMD_ARGS="--bind=0.0.0.0 --timeout 600" gunicorn app:app
2019-01-26T22:34:39.917566433Z [2019-01-26 22:34:39 +0000] [36] [INFO] Starting gunicorn 19.9.0
2019-01-26T22:34:39.923920247Z [2019-01-26 22:34:39 +0000] [36] [INFO] Listening at: http://0.0.0.0:8000 (36)
2019-01-26T22:34:39.924188048Z [2019-01-26 22:34:39 +0000] [36] [INFO] Using worker: sync
2019-01-26T22:34:39.934710872Z [2019-01-26 22:34:39 +0000] [39] [INFO] Booting worker with pid: 39
2019-01-26T22:34:45.284352457Z [2019-01-26 22:34:45 +0000] [39] [ERROR] Exception in worker process
2019-01-26T22:34:45.284378057Z Traceback (most recent call last):
2019-01-26T22:34:45.284382057Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/arbiter.py", line 583, in spawn_worker
2019-01-26T22:34:45.284396757Z     worker.init_process()
2019-01-26T22:34:45.284400957Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/workers/base.py", line 129, in init_process
2019-01-26T22:34:45.284404457Z     self.load_wsgi()
2019-01-26T22:34:45.284407757Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/workers/base.py", line 138, in load_wsgi
2019-01-26T22:34:45.284411157Z     self.wsgi = self.app.wsgi()
2019-01-26T22:34:45.284422857Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/app/base.py", line 67, in wsgi
2019-01-26T22:34:45.284426557Z     self.callable = self.load()
2019-01-26T22:34:45.284429757Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 52, in load
2019-01-26T22:34:45.284433057Z     return self.load_wsgiapp()
2019-01-26T22:34:45.284436357Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 41, in load_wsgiapp
2019-01-26T22:34:45.284439657Z     return util.import_app(self.app_uri)
2019-01-26T22:34:45.284442857Z   File "/usr/local/lib/python3.7/site-packages/gunicorn/util.py", line 350, in import_app
2019-01-26T22:34:45.284446157Z     __import__(module)
2019-01-26T22:34:45.284449357Z   File "/home/site/wwwroot/app.py", line 12, in <module>
2019-01-26T22:34:45.284453157Z     import pyodbc
2019-01-26T22:34:45.284456357Z ImportError: libodbc.so.2: cannot open shared object file: No such file or directory
2019-01-26T22:34:45.284754558Z [2019-01-26 22:34:45 +0000] [39] [INFO] Worker exiting (pid: 39)
2019-01-26T22:34:45.417282055Z [2019-01-26 22:34:45 +0000] [36] [INFO] Shutting down: Master
2019-01-26T22:34:45.417295855Z [2019-01-26 22:34:45 +0000] [36] [INFO] Reason: Worker failed to boot.
2019-01-26T22:34:45.467395867Z 

2019-01-26 22:34:46.506 ERROR - Container testnumber3_0 for site testnumber3 has exited, failing site start

Saturday, January 26, 2019 10:36 PM

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Just to highlight, yes if you need to add additional dependency packages, you could use pip install by adding the packages to the requriments.txt in your source repo, check out the sample at https://github.com/Azure-Samples/python-docs-hello-world/blob/master/requirements.txt.

Ensure that the startup script is appropriately set as mentioned in this sample:https://github.com/Azure-App-Service/python/blob/master/3.7.0/entrypoint.py#L30
See Troubleshooting to fetch more details on this issue. Also, see this discussion thread and let us know how it goes for further investigation.
- Edited by AjayKumar-MSFTMicrosoft employee, Owner Monday, January 28, 2019 7:28 PM
- Proposed as answer by AjayKumar-MSFTMicrosoft employee, Owner Monday, January 28, 2019 7:28 PM
Monday, January 28, 2019 7:24 PM

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Flask in Azure App Server

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