vnStat

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vnStat is a lightweight (command line) network traffic monitor. It monitors selectable interfaces and stores network traffic logs in a database for later analysis.

Installation

Install vnstat from the official repositories.

Configuration

Pick a preferred network interface and edit the Interface variable in the /etc/vnstat.conf accordingly. To the list all interfaces available to vnstat, use vnstat --iflist.

To start monitoring a particular interface you must initialize a database first. Each interface needs its own database. The command to initialize one for the eth0 interface is:

# vnstat -u -i eth0 

Start Systemd Service

After introducing the interface(s) and checking the config file. You can start the monitoring process via systemd

# systemctl start vnstat.service

To make this service permanent use

# systemctl enable vnstat.service

Usage

Query the network traffic:

# vnstat -q

Viewing live network traffic usage:

# vnstat -l

To find more options, use:

# vnstat --help