电玩城打鱼捕鱼-专业24小时上下分

新手学堂,内核日志

六月 11th, 2019  |  电玩城捕鱼系统简介

有时Linux系统或者系统上运行的mysqld或者其它进程,会发生一些莫名其妙的问题,比如突然挂掉了,比如突然重启等等。在软件上找不到问题所在,此时我们应该怀疑硬件或者内核的问题,此时我们就可以使用
dmesg 来查看:

每个使用UNIX/LINUX的人都知道日志的用处,那你是否清楚LINUX这些日志信息处理的来龙去脉呢?

NAME
      dmesg – print or control the kernel ring buffer

我们可以看到LINUX系统信息日志的途径基本有以下2种:

SYNOPSIS
      dmesg [-c] [-r] [-n level] [-s bufsize]

1)dmesg查看—-这个命令比较常见

DESCRIPTION
      dmesg is used to examine or control the kernel ring buffer.

2)/var/log/下的文件

      The  program  helps users to print out their bootup messages. 
Instead of copying the messages by hand, the user need
      only:
              dmesg > boot.messages
      and mail the boot.messages file to whoever can debug their
problem.

那下面我们就从这个2个途径着手,一步步的走下去.

OPTIONS
      -c    Clear the ring buffer contents after printing.

一)首先,我们来看dmesg这个常见的命令背后隐藏的是什么!!

      -r    Print the raw message buffer, i.e., don’t strip the log
level prefixes.

1)先让我们来MAN一下这个家伙

      -s bufsize
              Use a buffer of size bufsize to query the kernel ring
buffer.  This is 16392 by default.  (The default  kernel
              syslog  buffer  size  was  4096 at first, 8192 since
1.3.54, 16384 since 2.1.113.)  If you have set the kernel
              buffer to be larger than the default then this option can
be used to view the entire buffer.

————-man dmesg————————–

      -n level
              Set the level at which logging of messages is done to the
console.  For example, -n 1 prevents  all  messages,
              except panic messages, from appearing on the console.  All
levels of messages are still written to /proc/kmsg,
              so syslogd(8) can still be used to control exactly where
kernel messages appear.  When the -n option is  used,
              dmesg will not print or clear the kernel ring buffer.

NAME

              When both options are used, only the last option on the
command line will have an effect.

dmesg – print or control the kernel ring buffer

SEE ALSO
      syslogd(8)

SYNOPSIS

直接执行:dmesg 或者 dmesg > dmg.txt
就可以获得硬件信息和内核启动时的信息。

dmesg [ -c ] [ -n level ] [ -s bufsize ]

本文永久更新链接地址:http://www.linuxidc.com/Linux/2015-10/124553.htm

DESCRIPTION

图片 1

dmesg is used to examine or control the kernel ring buffer.

The program helps users to print out their bootup mes- sages. Instead of
copying the messages by hand, the user need only:

dmesg > boot.messages

and mail the boot.messages file to whoever can debug their

problem.

OPTIONS

-c Clear the ring buffer contents after printing.

-sbufsize

Use a buffer of size bufsize to query the kernel ring buffer. This is
16392 by default. (The default kernel syslog buffer size was 4096 at
first, 8192 since 1.3.54, 16384 since 2.1.113.) If you have set the
kernel buffer to be larger than the default then this option can be used
to view the entire buffer.

-nlevel

Set the level at which logging of messages is done to the console. For
example, -n 1 prevents all messages, expect panic messages, from
appearing on the console. All levels of messages are still written to
/proc/kmsg, so syslogd(8) can still be used to control exactly where
kernel messages appear.

When the -n option is used, dmesg will not print or clear the kernel
ring buffer.

When both options are used, only the last option on the command line
will have an effect.

从LINUX提供的手册,我们可以得知一条最重要的信息dmesg是从kernel 的ring
buffer(环缓冲区)中读取信息的.

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