How to debug cron job Add >> /home/cron.log 2>&1 after your command like this: * * * * * /usr/bin/docker exec -i test-scripts python /app/cron.py>> /home/cron.log 2>&1 Output will be added to /home/cron.log You want to know where is your crontab file? Look here: /var/spool/cron/crontabs System logs for cron? grep CRON /var/log/syslog