topic can console log redirect? in Operating System - Linux

can console log redirect?

monu_1 — Tue, 04 Nov 2008 19:44:28 GMT

hi all,

my PC is connected to a device through serial console. I want to redirect all the console messages I got on console to file.
console logs only generated upon system getting up/down, unexpected error occured etc.

Is it possible? if yes pl suggest how can i go further to collect console logs in a file on everytime when it getting generated?

Thanks,
MKS

Re: can console log redirect?

Ivan Ferreira — Wed, 05 Nov 2008 01:09:26 GMT

You can configure the /etc/syslog.conf to log kernel messages to files. You can use the dmesg command to display boot messages.

Re: can console log redirect?

Marcin Bartoszek — Wed, 05 Nov 2008 08:11:36 GMT

Which client do you use to connect to your serial console?
Most clients allow logging terminal communication to file.

E.g. In PuTTY you have to:
- select Serial in "Session" section
- fill COM number in "Serial line" field
- set log file name in "Logging" section
- select "All session output" or "Printable output" under Session logging.

Regards.
M.

Re: can console log redirect?

Steve Miller - GFS — Thu, 06 Nov 2008 21:32:23 GMT

You can also tell the kernel to redirect all of it's console messages directly to the serial port. This is useful if you have a kernel which is panicing, since syslog doesn't usually record these messages.

If your using grub as a boot loader, edit /boot/grub/menu.lst (or grub.conf). Look for the "kernel" line of your active kernel. At the end of that line, add a parameter "console=ttyS0,9600n8" to the end. Of course, adjust for your actual serial port, speed, etc.

Note that if you make this adjustment, you won't see any kernel messages as your booting...they will be all redirecting to the serial port. You should still get a "login" prompt at the end, as long as you have adjusted your getty configuration (/etc/inittab)

Re: can console log redirect?

monu_1 — Fri, 07 Nov 2008 15:36:22 GMT

Thanks for information Steve!

As console log wipeouts So we need to redirect all those logs to a file. So that we can debug issue from it.

Thank
-monu