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502 Issue
itgavin
Unladen Swallow
Posts: 2
Threads: 1
Joined: Oct 2022
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#1
Oct-05-2022, 10:59 PM (This post was last modified: Oct-12-2022, 09:13 PM by Larz60+. Edit Reason: fixed error tags )
Our company internal portal is running Python 3+Nginx+flask+Gunicorn on Ubuntu server. This portal was written by previous staff and I have just joined this company. My boss told me that this portal was no problem half a year ago, but now when we load it, the browser shows 502 Bad Gateway and asks me to fix it.

I am a newbie to Python. I already searched on Google, and it seems that Gunicorn, Nginx are still running after reboot. And when searching Nginx error log, it shows

Error:
 782#782: *8823 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.1.10, server: portal.mydomain.com, request: "GET /favicon.ico HTTP/1.1", upstream: "http://0.0.0.0:5123                       /favicon.ico", host: "192.168.1.105", referrer: "https://192.168.1.105/"
[
port 5123 is from Gunicorn, I have the following questions:
- I tried to locate favicon.ico in linux but could not find it.
- I tried to search for source files, but also could not find it, I just wondered where it came from?
- As there is no one to touch the system, why has it become this 502 issue in half a year later?

Can any expert share tips with me to solve this? Many thanks!
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itgavin
Unladen Swallow
Posts: 2
Threads: 1
Joined: Oct 2022
Reputation: 0
#2
Oct-12-2022, 11:30 AM (This post was last modified: Oct-12-2022, 09:14 PM by Larz60+.)
Finally, I found it seems to be gunicorn issue, when I try restart process manually, it got below exception, any advise on this? Many thank! Undecided 

Error:
[2022-10-12 12:25:52 +0100] [3774] [ERROR] Exception in worker process
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/gunicorn/arbiter.py", line 583, in spawn_worker
    worker.init_process()
  File "/usr/lib/python3/dist-packages/gunicorn/workers/base.py", line 119, in init_process
    self.load_wsgi()
  File "/usr/lib/python3/dist-packages/gunicorn/workers/base.py", line 144, in load_wsgi
    self.wsgi = self.app.wsgi()
  File "/usr/lib/python3/dist-packages/gunicorn/app/base.py", line 67, in wsgi
    self.callable = self.load()
  File "/usr/lib/python3/dist-packages/gunicorn/app/wsgiapp.py", line 49, in load
    return self.load_wsgiapp()
  File "/usr/lib/python3/dist-packages/gunicorn/app/wsgiapp.py", line 39, in load_wsgiapp
    return util.import_app(self.app_uri)
  File "/usr/lib/python3/dist-packages/gunicorn/util.py", line 436, in import_app
    app = app(*args, **kwargs)
  File "/home/project/project/__init__.py", line 35, in create_app
    from main import main as main_blueprint
  File "/home/project/project/main.py", line 13, in <module>
    import mail as m
  File "/home/project/project/mail.py", line 88, in <module>
    creds.refresh(Request())
  File "/home/project/.local/lib/python3.8/site-packages/google/oauth2/credentials.py", line 302, in refresh
    ) = reauth.refresh_grant(
  File "/home/project/.local/lib/python3.8/site-packages/google/oauth2/reauth.py", line 347, in refresh_grant
    _client._handle_error_response(response_data)
  File "/home/project/.local/lib/python3.8/site-packages/google/oauth2/_client.py", line 60, in _handle_error_response
    raise exceptions.RefreshError(error_details, response_data)
google.auth.exceptions.RefreshError: ('invalid_grant: Bad Request', {'error': 'invalid_grant', 'error_description': 'Bad Request'})
[2022-10-12 12:25:52 +0100] [3774] [INFO] Worker exiting (pid: 3774)
[2022-10-12 12:25:52 +0100] [3777] [ERROR] Exception in worker process
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/gunicorn/arbiter.py", line 583, in spawn_worker
    worker.init_process()
  File "/usr/lib/python3/dist-packages/gunicorn/workers/base.py", line 119, in init_process
    self.load_wsgi()
  File "/usr/lib/python3/dist-packages/gunicorn/workers/base.py", line 144, in load_wsgi
    self.wsgi = self.app.wsgi()
  File "/usr/lib/python3/dist-packages/gunicorn/app/base.py", line 67, in wsgi
    self.callable = self.load()
  File "/usr/lib/python3/dist-packages/gunicorn/app/wsgiapp.py", line 49, in load
    return self.load_wsgiapp()
  File "/usr/lib/python3/dist-packages/gunicorn/app/wsgiapp.py", line 39, in load_wsgiapp
    return util.import_app(self.app_uri)
  File "/usr/lib/python3/dist-packages/gunicorn/util.py", line 436, in import_app
    app = app(*args, **kwargs)
  File "/home/project/project/__init__.py", line 35, in create_app
    from main import main as main_blueprint
  File "/home/project/project/main.py", line 13, in <module>
    import mail as m
  File "/home/project/project/mail.py", line 88, in <module>
    creds.refresh(Request())
  File "/home/project/.local/lib/python3.8/site-packages/google/oauth2/credentials.py", line 302, in refresh
    ) = reauth.refresh_grant(
  File "/home/project/.local/lib/python3.8/site-packages/google/oauth2/reauth.py", line 347, in refresh_grant
    _client._handle_error_response(response_data)
  File "/home/project/.local/lib/python3.8/site-packages/google/oauth2/_client.py", line 60, in _handle_error_response
    raise exceptions.RefreshError(error_details, response_data)
google.auth.exceptions.RefreshError: ('invalid_grant: Bad Request', {'error': 'invalid_grant', 'error_description': 'Bad Request'})
[2022-10-12 12:25:52 +0100] [3777] [INFO] Worker exiting (pid: 3777)
[2022-10-12 12:25:52 +0100] [3775] [ERROR] Exception in worker process
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/gunicorn/arbiter.py", line 583, in spawn_worker
    worker.init_process()
  File "/usr/lib/python3/dist-packages/gunicorn/workers/base.py", line 119, in init_process
    self.load_wsgi()
  File "/usr/lib/python3/dist-packages/gunicorn/workers/base.py", line 144, in load_wsgi
    self.wsgi = self.app.wsgi()
  File "/usr/lib/python3/dist-packages/gunicorn/app/base.py", line 67, in wsgi
    self.callable = self.load()
  File "/usr/lib/python3/dist-packages/gunicorn/app/wsgiapp.py", line 49, in load
    return self.load_wsgiapp()
  File "/usr/lib/python3/dist-packages/gunicorn/app/wsgiapp.py", line 39, in load_wsgiapp
    return util.import_app(self.app_uri)
  File "/usr/lib/python3/dist-packages/gunicorn/util.py", line 436, in import_app
    app = app(*args, **kwargs)
  File "/home/project/project/__init__.py", line 35, in create_app
    from main import main as main_blueprint
  File "/home/project/project/main.py", line 13, in <module>
    import mail as m
  File "/home/project/project/mail.py", line 88, in <module>
    creds.refresh(Request())
  File "/home/project/.local/lib/python3.8/site-packages/google/oauth2/credentials.py", line 302, in refresh
    ) = reauth.refresh_grant(
  File "/home/project/.local/lib/python3.8/site-packages/google/oauth2/reauth.py", line 347, in refresh_grant
    _client._handle_error_response(response_data)
  File "/home/project/.local/lib/python3.8/site-packages/google/oauth2/_client.py", line 60, in _handle_error_response
    raise exceptions.RefreshError(error_details, response_data)
google.auth.exceptions.RefreshError: ('invalid_grant: Bad Request', {'error': 'invalid_grant', 'error_description': 'Bad Request'})
[2022-10-12 12:25:52 +0100] [3775] [INFO] Worker exiting (pid: 3775)
[2022-10-12 12:25:52 +0100] [3776] [ERROR] Exception in worker process
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/gunicorn/arbiter.py", line 583, in spawn_worker
    worker.init_process()
  File "/usr/lib/python3/dist-packages/gunicorn/workers/base.py", line 119, in init_process
    self.load_wsgi()
  File "/usr/lib/python3/dist-packages/gunicorn/workers/base.py", line 144, in load_wsgi
    self.wsgi = self.app.wsgi()
  File "/usr/lib/python3/dist-packages/gunicorn/app/base.py", line 67, in wsgi
    self.callable = self.load()
  File "/usr/lib/python3/dist-packages/gunicorn/app/wsgiapp.py", line 49, in load
    return self.load_wsgiapp()
  File "/usr/lib/python3/dist-packages/gunicorn/app/wsgiapp.py", line 39, in load_wsgiapp
    return util.import_app(self.app_uri)
  File "/usr/lib/python3/dist-packages/gunicorn/util.py", line 436, in import_app
    app = app(*args, **kwargs)
  File "/home/project/project/__init__.py", line 35, in create_app
    from main import main as main_blueprint
  File "/home/project/project/main.py", line 13, in <module>
    import mail as m
  File "/home/project/project/mail.py", line 88, in <module>
    creds.refresh(Request())
  File "/home/project/.local/lib/python3.8/site-packages/google/oauth2/credentials.py", line 302, in refresh
    ) = reauth.refresh_grant(
  File "/home/project/.local/lib/python3.8/site-packages/google/oauth2/reauth.py", line 347, in refresh_grant
    _client._handle_error_response(response_data)
  File "/home/project/.local/lib/python3.8/site-packages/google/oauth2/_client.py", line 60, in _handle_error_response
    raise exceptions.RefreshError(error_details, response_data)
google.auth.exceptions.RefreshError: ('invalid_grant: Bad Request', {'error': 'invalid_grant', 'error_description': 'Bad Request'})
[2022-10-12 12:25:52 +0100] [3776] [INFO] Worker exiting (pid: 3776)
[2022-10-12 12:25:52 +0100] [3772] [INFO] Shutting down: Master
[2022-10-12 12:25:52 +0100] [3772] [INFO] Reason: Worker failed to boot.
Larz60+ write Oct-12-2022, 09:14 PM:
Please post all code, output and errors (it it's entirety) between their respective tags. Refer to BBCode help topic on how to post. Use the "Preview Post" button to make sure the code is presented as you expect before hitting the "Post Reply/Thread" button.
Fixed for you this time. Please use BBCode tags on future posts.
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