Network I/O Metrics

The netif input plugin gathers network traffic information of the running system every certain interval of time, and reports them.

Configuration Parameters

The plugin supports the following configuration parameters:




Specify the network interface to monitor. e.g. eth0


Polling interval (seconds). default: 1


Polling interval (nanosecond). default: 0


If true, gather metrics precisely. default: false

Getting Started

In order to monitor network traffic from your system, you can run the plugin from the command line or through the configuration file:

Command Line

$ bin/fluent-bit -i netif -p interface=eth0 -o stdout
Fluent Bit v1.x.x
* Copyright (C) 2019-2020 The Fluent Bit Authors
* Copyright (C) 2015-2018 Treasure Data
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
[2017/07/08 23:34:18] [ info] [engine] started
[0] netif.0: [1499524459.001698260, {"eth0.rx.bytes"=>89769869, "eth0.rx.packets"=>73357, "eth0.rx.errors"=>0, "eth0.tx.bytes"=>4256474, "eth0.tx.packets"=>24293, "eth0.tx.errors"=>0}]
[1] netif.0: [1499524460.002541885, {"eth0.rx.bytes"=>98, "eth0.rx.packets"=>1, "eth0.rx.errors"=>0, "eth0.tx.bytes"=>98, "eth0.tx.packets"=>1, "eth0.tx.errors"=>0}]
[2] netif.0: [1499524461.001142161, {"eth0.rx.bytes"=>98, "eth0.rx.packets"=>1, "eth0.rx.errors"=>0, "eth0.tx.bytes"=>98, "eth0.tx.packets"=>1, "eth0.tx.errors"=>0}]
[3] netif.0: [1499524462.002612971, {"eth0.rx.bytes"=>98, "eth0.rx.packets"=>1, "eth0.rx.errors"=>0, "eth0.tx.bytes"=>98, "eth0.tx.packets"=>1, "eth0.tx.errors"=>0}]

Configuration File

In your main configuration file append the following Input & Output sections:

Name netif
Tag netif
Interval_Sec 1
Interval_NSec 0
Interface eth0
Name stdout
Match *

Note: Total interval (sec) = Interval_Sec + (Interval_Nsec / 1000000000).

e.g. 1.5s = 1s + 500000000ns