Question
Issue with Werkzeug library
- Posted on May 18, 2021
- PythonFlaskUbuntu 20.04
Asked by MassiveAquamarineStarfish
Hey everybody,
My code works perfectly fine on my machine, but when I deploy it to Ubuntu server (Ubuntu 20.04 (LTS) x64) I get the following error:
(env) root@ubuntu-s-1vcpu-1gb-intel-nyc1-01:~/demo# python run.py
- Serving Flask app “demo” (lazy loading)
- Environment: production WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
- Debug mode: on
- Running on all addresses. WARNING: This is a development server. Do not use it in a production deployment.
- Running on http://143.198.118.35:5000/ (Press CTRL+C to quit)
- Restarting with stat Killed (env) root@ubuntu-s-1vcpu-1gb-intel-nyc1-01:~/demo# * Debugger is active!
- Debugger PIN: 521-632-002 Traceback (most recent call last): File “/root/demo/run.py”, line 4, in <module> app.run(host=‘0.0.0.0’) File “/root/demo/env/lib/python3.8/site-packages/flask/app.py”, line 990, in run run_simple(host, port, self, **options) File “/root/demo/env/lib/python3.8/site-packages/werkzeug/serving.py”, line 1000, in run_simple _rwr( File “/root/demo/env/lib/python3.8/site-packages/werkzeug/_reloader.py”, line 418, in run_with_reloader ensure_echo_on() File “/root/demo/env/lib/python3.8/site-packages/werkzeug/_reloader.py”, line 398, in ensure_echo_on termios.tcsetattr(sys.stdin, termios.TCSANOW, attributes) termios.error: (5, ‘Input/output error’)
What could be the problem?
Thank you so much for your help! niko
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Not entirely sure of what might cause this, but input/output error might have to do with permissions. Is this writing to the terminal or a (virtual?) serial port?
In the latter case, make sure you are added to the correct group (
modem, I believe, then logout and login again).In the former, check who owns the python script you’re trying to run. Go to the folder where
run.pyis located and runls -lhTry running as root (sudo python run.py) to see if it fixes it.If it works under
sudo, it is most likely a permissions issue.If you’ve uploaded the file as root, then the regular user may not be allowed to run the script (just a thought).