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Old 03-18-2010, 11:07 PM   #16
catkin
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Registered: Dec 2008
Location: Tamil Nadu, India
Distribution: Servers: Debian Squeeze and Wheezy. Desktop: Slackware64 14.0. Netbook: Slackware 13.37
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Quote:
Originally Posted by gauchao View Post
Take a look into /var/log
Thanks gaucho. I am familiar with all the logs modified during boot in that directory. Did you have something specific in mind?

BTW, I have been experimenting with bootlogd and have found it generates a log under the following conditions:
  • /var/log/boot exists.
  • GRUB kernel line kernel /vmlinuz-huge-smp-2.6.29.6-smp root=/dev/sda7 console=/dev/tty0 ro.
  • bootlogd started at the end of rc.S
Having got something working I am experimenting to determine what is necessary. So far I have found that bootlogd does not produce a log when:
  1. /var/log/boot does not exist (subject to confirmation)
  2. bootlogd is started from rc.S:
    1. At the beginning.
    2. After starting udev.
 
Old 03-21-2010, 02:12 AM   #17
catkin
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Registered: Dec 2008
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Distribution: Servers: Debian Squeeze and Wheezy. Desktop: Slackware64 14.0. Netbook: Slackware 13.37
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Summarising recent experiments ...

No getty on tty1

Does not allow Shift+PgUp after boot has finished.

Commenting out the tty1 getty line in inittab does not result in tty1 being used for the graphical display manager (xdm on the test system) as suggested in the OP and does not, of course, display a logon prompt. But Shift+Pg does not work as it does during boot either. Perhaps the keyboard is switched from tty0 (console) to tty1 at the end of boot; it would be interesting to know how that works.

bootlogd

bootlogd creates and populates /var/log/boot providing:
  • /var/log/ is accessible when it is started.
  • The kernel is started with a valid console parameter.
Notes:
  1. Tested on Slackware 13.0 32-bit with bootlogd 2.86 and /var on a separate file system.
  2. bootlogd works with kernel parameter vga=791 (tested. There are reports, not Slackware-specific, of bootlogd not working with frame buffers).
  3. bootlogd will create /var/log/boot if it does not exist (tested. At least one version of bootlogd does not create it).
  4. If bootlogd is running at shutdown, it logs console shutdown messages up to "Unmounting remote filesystems" (tested. bootlogd was left running from startup to shutdown).
  5. The bootlogd man page says "If the logfile is not accessible, the messages will be buffered in-memory until it is" but test results did not support that; the earliest bootlogd startup that logged messages was in rc.S after "Mounting non-root local filesystems" and before the second swapon.
  6. bootlogd was not seen to log any activity on tty1 (there have been reports that it does so, including capturing passwords entered during logon).
 
Old 03-21-2010, 03:56 AM   #18
gnashley
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Registered: Dec 2003
Location: Germany
Distribution: Slackware
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xdm does this just after authenticating the user login in /etc/X11/xdm/GiveConsole:
chown $USER /dev/console

You might try this in the boot params:
console=/dev/console
excerpt from a bootup:
Boot logging started on /dev/tty1(/dev/console)

Last edited by gnashley; 03-21-2010 at 04:55 AM.
 
  


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