Kernel log levels (defined in
linux/kernel.h):
#define KERN_EMERG "<0>" /* system is unusable */
#define KERN_ALERT "<1>" /* action must be taken immediately */
#define KERN_CRIT "<2>" /* critical conditions */
#define KERN_ERR "<3>" /* error conditions */
#define KERN_WARNING "<4>" /* warning conditions */
#define KERN_NOTICE "<5>" /* normal but significant condition */
#define KERN_INFO "<6>" /* informational */
#define KERN_DEBUG "<7>" /* debug-level messages */
Check the current log level:
deby:~# cat /proc/sys/kernel/printk
7 4 1 7
sysctl.conf
Ensure you have the following in
/etc/sysctl.conf:
# The four values in printk denote:
# console_loglevel, default_message_loglevel,
# minimum_console_loglevel, default_console_loglevel
#
# Uncomment the following to stop low-level messages on console
kernel.printk = 4 4 1 6
These changes become effective after reboot. But you might need changes take place immediately:
echo "4 4 1 6" > /proc/sys/kernel/printk
grub
You can pass
quiet parameter during kernel boot in
/boot/grub/menu.list in order to suppress logs during boot:
kernel /boot/vmlinuz-2.6.26-2-686 root=/dev/sda1 ro quiet panic=0
Please note that after kernel upgrade the above changes to grub will be lost, so take this into account or add another section to your grub loader as shown below.
# Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST
title Debian GNU/Linux, kernel 2.6.26-2-686 (quiet)
root (hd0,0)
kernel /boot/vmlinuz-2.6.26-2-686 root=/dev/sda1 ro quiet panic=0
initrd /boot/initrd.img-2.6.26-2-686
### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options
## below
No comments :
Post a Comment