Monitoring "eth0" automatically adds a database file to the /var/lib/vnstat directory that holds the network traffic log messages "-iflist" shows available interfaces, and the "-d" option enables background monitoring. Lastly, starting the daemon initializes monitoring in the background, which minimizes the impact your monitoring has on overall performance.
Run "-iflist" to display all available interfaces. When you begin monitoring eth0, it creates a database file "eth0" in the /var/lib/vnstat directory that stores all network traffic log messages for that interface. To get started, you must specify each interface to be monitored. On The Geek Stuff, Ramesh Natarajan explains how to use VnStat for tracking, logging, and other network-monitoring tasks. VnStat options display the server's network traffic by hour, day, week, month, and other categories. Other options show transfers by hour, day, week, month, and other categories. Source: BinaryTidesĪdding the "-l" option returns only the live data. Running VnStat with no options shows total data transfers, and transfers by month and day. When running without any options, VnStat generates a report of all data transfers since it began running, as well as the total by month and day. The top-voted solution was to use VnStat, which runs as a background service/daemon and records data transfers on a constant basis. That's what motivated a post to Server Fault asking for a method to track and log a Linux server's network traffic to confirm it remains below the cap.
The typical scenario is when you use an Internet service that caps your bandwidth. In fact, there are almost as many ways to calculate a Linux server's data traffic as there are Linux servers. It's a simple question: How much data was received and transmitted by a particular Linux server today, this week, this month? Finding a reliable answer is not so simple. Which is the command that will return the specific information you need at the moment, such as total bandwidth used today? Here's a quick look at more than a dozen command-line tools that display the precise network information you're looking for. When it comes to monitoring network activity on a Linux server, you've got more tools and techniques at your disposal than you can shake a USB stick at.
A Guide to Monitoring Network Traffic on a Linux Server
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