Calyptia Core Agent
23.10
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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
Prio_Level
The log level to filter. The kernel log is dropped if its priority is more than prio_level. Allowed values are 0-8. Default is 8. 8 means all logs are saved.
8

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/calyptia-fluent-bit -i kmsg -t kernel -o stdout -m '*'
Calyptia Fluent Bit 20.10.03
[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 *