vnstat []

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First you will need to install the epel repository
You can then install the tool with

yum install vnstat

You will then need to create a database for the tool:

runuser -l vnstat -g vnstat -c '/usr/bin/vnstat -u -i eth0'

Once this has been done we will remove shell access for the user:

chsh -s /sbin/nologin vnstat

vnstat -i eth0

vnstat -i eth0 -d

vnstat -i eth0 -l