控制台上的linux kprint消息 [英] linux kprint messages on console
问题描述
为了在控制台上打印此消息，我用kill -SIGKILL <pid>命令杀死了klogd并用klogd -s -c 2重新启动了klogd
我仍然在控制台上看不到该消息.我在这里想念什么?
预先感谢.
In order to print this meesage on console, I killed klogd with kill -SIGKILL <pid>command and restarted klogd with klogd -s -c 2
I still don't see the message on console. What do I miss here?
Thanks in advance.
printk(KERN_ALERT "Hello World\n");
推荐答案
您必须确保您处于完全终端模式(按Alt + Ctrl + f2或f3)，而不是图形模式.
You have to make sure you're in full terminal mode( press Alt+Ctrl+f2 or f3) and not Graphical mode.
然后检查/proc/sys/kernel/printk是否具有正确的值
then check if the /proc/sys/kernel/printk is having right values
# cat /proc/sys/kernel/printk
# cat /proc/sys/kernel/printk
4 4 1 7
4 4 1 7
my current setting are above. You can use echo 8 > /proc/sys/kernel/printk to print everything. for kern_alert 4 is enough.
my current setting are above. You can use echo 8 > /proc/sys/kernel/printk to print everything. for kern_alert 4 is enough.
for testing you can use below from full terminal mode.
for testing you can use below from full terminal mode.
#echo "<1>Writing critical printk messages from userspace" >/dev/kmsg
#echo "<1>Writing critical printk messages from userspace" >/dev/kmsg
这将打印到终端
http://elinux.org/Debugging_by_printing
kern_alert可以打印到当前终端，而kern_emerg则可以打印到所有终端.
kern_alert with print to current terminal while kern_emerg will print to all terminals.
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