Implementing Network Traffic Monitoring on a CentOS 7 Server Using vnStat
This article provides instructions for installing and setting up `vnStat` on a CentOS 7 server to monitor network traffic.
Installation
- Install the EPEL repository if it is not already installed:
sudo yum install epel-release
- Install `vnStat`:
sudo yum install vnstat
Database Initialization
After installing `vnStat`, you need to initialize its database. First, identify your network interfaces using `ip link` or `ifconfig`.
Then, initialize the database for the desired interface (e.g., `eth0`):
sudo vnstat -u -i eth0
Service Management
Start and enable the `vnStat` service:
sudo systemctl start vnstat sudo systemctl enable vnstat
Checking Statistics
You can now check traffic statistics using the `vnstat` command without any parameters. This will display daily and monthly traffic data.
Visual Representation with vnStati
For a visual representation of the statistics, you can use `vnStati`. For example, the following command generates an overview statistics image for the `eth0` interface and saves it as `vnstat.png` in your home directory:
vnstati -vs -i eth0 -o ~/vnstat.png
Limitations
Please note that `vnStat` and `vnStati` do not provide real-time monitoring. For real-time network traffic monitoring, consider using tools such as `nload`, `iftop`, or `bmon`.