Cron job abuse - Prevent user forom using crons at their discretion

[max2000]

Cron job abuse - Prevent user from using crons at their discretion

Hi,

May be someone can help me.

I have a server with hundreds users. I works fine but users are abusing from cron jobs. Some have 2 Gb data and launch a daily backup. This leads to server overload and eventually crashs.

I used the command:

echo ALL >>/etc/cron.deny

All the customers are on the cron.deny file but this doesn't prevent them to lauch crons even every minute if they like.

I stopped the crond but I am unable to monitor stats, logs, bandwith usage...

Thank you for your help