DMESG(8) System Manager's Manual DMESG(8)NAME
dmesg - print or control the kernel ring buffer
SYNOPSIS
dmesg [ -c ] [ -n level ] [ -s bufsize ]
DESCRIPTION
dmesg is used to examine or control the kernel ring buffer.
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.
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.
SEE ALSO syslogd(8)AUTHOR
Theodore Ts'o (tytso@athena.mit.edu)
DMESG(8)
Check Out this Related Man Page
DMESG(1) General Commands Manual DMESG(1)NAME
dmesg - print or control the kernel ring buffer
SYNOPSIS
dmesg [-c] [-r] [-n level] [-s bufsize]
DESCRIPTION
dmesg is used to examine or control the kernel ring buffer.
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.
OPTIONS -c Clear the ring buffer contents after printing.
-r Print the raw message buffer, i.e., don't strip the log level prefixes.
-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.
-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.
When both options are used, only the last option on the command line will have an effect.
SEE ALSO syslogd(8)AVAILABILITY
The dmesg command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
DMESG(1)
Oct 22 13:40:07 snmpdx: community_check() : bad community from
Oct 22 13:40:07 snmpdx: session_open() failed for a pdu received from
any help?
thanks (4 Replies)
Hi all,
I have a very weard error message in my dmesg output, and I cannot find the solution in google. Does anyone know what it might be ?
Equivalently mapped reserve pool exhausted;
Overall application performance may be improved by increasing the "eqmemsize" tunable parameter (currently... (3 Replies)
Hi falks,
I'm trying to get the momory size in HP-UX as user oracle.
The command to do it is:
/usr/sbin/dmesg | grep "Physical" | awk '{print $2}'
The problem is that only user root can run this command and i need to run it as user oracle.
Do you know another way to get the memory size in HP... (2 Replies)
Hi
First I want to explain the scenerio :
In my project I want to control the printing of some messages. Thats why I use
#ifdef MESSAGE
------------print message--------------
#endif
And when I compile the program with -DMESSAGE option, it shows all message and without -DMESSAGE option... (7 Replies)
For a few weeks now, on several of our machines, i've been seeing this in /var/log/messages and dmesg:
Nov 14 16:37:48 stg2 kernel: svc: bad direction 256, dropping request
Nov 14 16:37:48 stg2 kernel: svc: short len 4, dropping request
Nov 14 16:38:02 stg2 kernel: svc: bad direction 256,... (2 Replies)
Hello people,
My solaris server is rebooting, not sure how!!! Which log should I look in to? I checked /var/adm/messages and dmesg also. How do I check older dmesg logs? I checked lastlog and also ran the last command. Nothing useful pointing to why server rebooted.
Also when server reboots I... (4 Replies)
Hi all
In a bit of a pickle here and need some help.
I have a 6800, with 2 SC controllers. I have a terminal concentrator ( TC ) attached to the serial ports. I cant ping / telnet these sc controllers, and when on the TC, I cant connect into them either. I am able to telnet to other servers... (21 Replies)
Can anyone explain me the difference between difference between dmesg and /var/adm/messages in solaris. I tried to find out the difference but I didn't get much info on that. As per my knowledge both are used to check the logs.. (3 Replies)
Dear All,
I Have problem at my console (Ultra 24, solaris 10 x86), when i type dmesg always come out :
like this
You have new mail.
root@console # bash
root@console # dmesg
couldn't set locale correctly
couldn't set locale correctly
So how to fix it...?
Best Regards
simbah (3 Replies)
Hi,
I'm using 2.6.11 kernel on ARM 9. Below are the messages I get issuing different commands.
When I give "reboot" I get run level 6 initiated and get the following messages. I have nothing to complaint about it. All the scripts in rc6.d are executed.
The system is going down for reboot... (3 Replies)
Hi all,
One of the server is showing empty messages
# logger -p user.error HELLO_SYSLOGD
# dmesg
Mon Apr 23 15:11:19 MYT 2012
/etc/syslog.conf file, i tried copy the conf file from another server, still it is not working
*.err;kern.notice;auth.notice /dev/sysmsg... (8 Replies)
Hello,
I have a problem with the hard drive connected to my setup. When I connect the HDD which is damaged, and try to bring up my system, I get some error messages continuously on my console saying
ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 frozen
ata2.01: failed command:... (4 Replies)
Hi there,
I miss date information when executing # dmesg
Is it possible to add this a date information to my results of # dmesg
?
Best wishes (12 Replies)