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Initial configuration
add users
adduser <username> vim /etc/group
If necessary, add permissions to the respective user
visudo
change hostname
hostname <newname>
install bandwith monitor
yum -y install vnstat
Run the following command to establish the database:
vnstat -u -i eth0
Then enter the same command into the crontab to be executed every hour:
crontab -e 0 * * * * root vnstat -u -i eth0