- Get current console print log level:
sysctl kernel.printk
For instance, if the output is 4 4 1 7, you can reset it.
- Reset console print log level:
sysctl -w kernel.printk="2 4 1 7"
CUR = current severity level; only messages more important than this level are printed
DEF = default severity level assigned to messages with no level
MIN = minimum allowable CUR
BTDEF = boot-time default CUR
While another saying is console_loglevel, default_message_loglevel, minimum_console_loglevel, default_console_loglevel. Refer to here.
Log level 7 4 1 7 to 3 4 1 3 is demonstrated as below:
CUR DEF MIN BTDEF
0 - emergency x x
1 - alert x x x
2 - critical x x
3 - error x x
4 - warning x x x
5 - notice x x
6 - informational V V
7 - debug
CUR DEF MIN BTDEF
0 - emergency x x
1 - alert x x x
2 - critical x x
3 - error V V
4 - warning x
5 - notice
6 - informational
7 - debug
Refer to Severity_levels.
