How to redirect all script output to a file?

Question

linux

Hello, I wrote a script, it should be executed periodically, I registered it in the cron, but there is a problem with output to a file
here crontab

* * * * *   root python /home/root/main.py >> /home/root/app.log 2>&1

here is an example script

import logging

logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
logger = logging.getLogger(__name__)

def main():
    pass

if __name__ == '__main__':
    logger.info('Run script...')
    main()

If I run it manually

python /home/user/main.py >> /home/user/app.log 2>&1

then the entire output with all the logs ends up in the file, but when it is executed in the cron, the file remains empty, the script fulfills 100%
UPD: if this is of course important - all this is launched under the docker

Answer 1

registered it in the crown
In /etc/crontab? Only you need to specify the user in it, this field is not in user crontab.
Is that right 100%? What can be seen in /var/log/syslog?

Answer 2

there was also such a case in my practice
, by default, cron uses not bash but sh, because of which you can observe how the same thing works in bash and does not work in cron
, this is because bash is a thing actually user and what if cron was posix compatible it uses the standard shell interpreter

Answer 3

It's not clear why there is no indication of the time.
Clearly stated:
# mhdmw user command
1 * * * * /bin/sh /path_you_script
And of course it must have execute permissions.