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Kernel Logs

The kmsg input plugin reads the Linux Kernel log buffer since the beginning, it gets every record and parse it field as priority, sequence, seconds, useconds, and message.

Configuration Parameters

Key

Description

Default

Getting Started

In order to start getting the Linux Kernel messages, you can run the plugin from the command line or through the configuration file:

Command Line

$ bin/fluent-bit -i kmsg -t kernel -o stdout -m '*'
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
* https://fluentbit.io

[0] kernel: [1463421823, {"priority"=>3, "sequence"=>1814, "sec"=>11706, "usec"=>732233, "msg"=>"ERROR @wl_cfg80211_get_station : Wrong Mac address, mac = 34:a8:4e:d3:40:ec profile =20:3a:07:9e:4a:ac"}]
[1] kernel: [1463421823, {"priority"=>3, "sequence"=>1815, "sec"=>11706, "usec"=>732300, "msg"=>"ERROR @wl_cfg80211_get_station : Wrong Mac address, mac = 34:a8:4e:d3:40:ec profile =20:3a:07:9e:4a:ac"}]
[2] kernel: [1463421829, {"priority"=>3, "sequence"=>1816, "sec"=>11712, "usec"=>729728, "msg"=>"ERROR @wl_cfg80211_get_station : Wrong Mac address, mac = 34:a8:4e:d3:40:ec profile =20:3a:07:9e:4a:ac"}]
[3] kernel: [1463421829, {"priority"=>3, "sequence"=>1817, "sec"=>11712, "usec"=>729802, "msg"=>"ERROR @wl_cfg80211_get_station : Wrong Mac address, mac = 34:a8:4e:d3:40:ec
...

As described above, the plugin processed all messages that the Linux Kernel reported, the output has been truncated for clarification.

Configuration File

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

[INPUT]
    Name   kmsg
    Tag    kernel

[OUTPUT]
    Name   stdout
    Match  *

pipeline:
    inputs:
        - name: kmsg
          tag: kernel
    outputs:
        - name: stdout
          match: '*'