在启动期间更改默认控制台日志级别 [英] Change default console loglevel during boot up
问题描述
我设置了 CentOS 6.3 设置,其中控制台日志级别设置为 4,默认日志级别设置为 4.我知道我可以使用以下步骤更改默认控制台日志级别:
I setup a CentOS 6.3 setup, on which the console loglevel is set to 4, and default log level is set to 4. I know I can change the default console log level using the following steps:
cat /proc/sys/kernel/printk
4 4 1 7
echo 5 > /proc/sys/kernel/printk
cat /proc/sys/kernel/printk
5 4 1 7
但是,在重新启动后,控制台日志级别会恢复为原始值.我是否需要重新编译内核,或者有什么方法可以使更改后的值在重启后保持不变.
However, upon reboot, the console log level reverts back to the original value. Do I need to recompile the kernel, or is there a way I can get the changed value to be persistent across reboot.
推荐答案
需要重新编译内核吗,
Do I need to recompile the kernel,
没有
或者有什么方法可以使更改后的值在重新启动后保持不变.
or is there a way I can get the changed value to be persistent across reboot.
是的.
使用内核命令行参数loglevel
:
loglevel= All Kernel Messages with a loglevel smaller than the
console loglevel will be printed to the console. It can
also be changed with klogd or other programs. The
loglevels are defined as follows:
0 (KERN_EMERG) system is unusable
1 (KERN_ALERT) action must be taken immediately
2 (KERN_CRIT) critical conditions
3 (KERN_ERR) error conditions
4 (KERN_WARNING) warning conditions
5 (KERN_NOTICE) normal but significant condition
6 (KERN_INFO) informational
7 (KERN_DEBUG) debug-level messages
内核命令行上可能的完整参数列表位于 Linux/Documentation/kernel-parameters.txt
源代码树中的文件.
The entire list of parameters possible on the kernel command line are in the Linux/Documentation/kernel-parameters.txt
file in the source tree.
根据您的引导加载程序(例如 Grub 或 U-Boot),您必须编辑文本以将此新参数添加到命令行.使用cat/proc/cmdline
查看上次启动时使用的内核命令行.
Depending on your bootloader (e.g. Grub or U-Boot), you will have to edit text to add this new parameter to the command line. Use cat /proc/cmdline
to view the kernel command line used for the previous boot.
附录
要显示所有内容,为 loglevel 参数提供的数字必须大于 KERN_DEBUG.
也就是说,您必须指定 loglevel=8
.
或者简单地使用 ignore_loglevel
参数来显示所有内核消息.
To display everything, the number supplied for the loglevel parameter would have be be greater than KERN_DEBUG.
That is, you would have to specify loglevel=8
.
Or simply use the ignore_loglevel
parameter to display all kernel messages.
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