Crontab is not working on Amazon EC2 server

Question

Crontab is not working on Amazon EC2 Linux Server.

I have saved below codes in /etc/crontab file

crontab
# For details see man 4 crontabs 
# Example          


        

Answer 1

I recently began using Amazon's linux distro on ec2 instances and after trying all kinds of things for cron all I needed was:
sudo service crond start
crontab -e
This allowed me to set a cron job as "ec2-user" without specifying the user. For example:
0 12 * * * python3 example.py
In fact, specifying a user here prevented it from running.