Rod Rook wrote:

<snip>

> Hi, Lee,
> The problem mentioned in the thread you referred to is usually caused
> by Network Manager, which has nothing to do with boot.log.
> Thanks to you anyway.

Perhaps he meant the thread beginning at
http://lists.centos.org/pipermail/centos/2009-October/084836.html

My boot log looks like this:

       [root@mavis log]# pwd
       /var/log
       [root@mavis log]# ls -l | grep boot
       -rw------- 1 root    root          0 Nov  1 04:02 boot.log
       -rw------- 1 root    root          0 Oct 25 04:02 boot.log.1
       -rw------- 1 root    root          0 Oct 18 04:02 boot.log.2
       -rw------- 1 root    root          0 Oct 11 04:02 boot.log.3
       -rw------- 1 root    root          0 Oct  4 04:02 boot.log.4
       [root@mavis log]#

The zero length most like indicates that there are no entries :-;  yet
we can see that the machine has been rebooted:

        [root@mavis log]# grep boot messages*
       messages.2:Oct 22 11:39:13 mavis shutdown[26207]: shutting down
       for system reboot
       messages.4:Oct  5 16:17:33 mavis shutdown[19739]: shutting down
       for system reboot
       messages.4:Oct  5 16:27:07 mavis shutdown[4979]: shutting down
       for system reboot
       messages.4:Oct  5 16:33:25 mavis shutdown[4738]: shutting down
       for system reboot
       messages.4:Oct 10 15:01:46 mavis shutdown[11680]: shutting down
       for system reboot
       [root@mavis log]#

Frankly, I can do very well without have boot.log at all but it seems
that if we have it, it really should work!
Mounting an old CentOS-4 disk, we see that it worked in CentOS 4:

       [root@mavis log]# pwd
       /old-sys/var/log
       [root@mavis log]# ls -l | grep boot
       -rw------- 1 root          root     107353 May 21  2007 boot.log
       -rw------- 1 root          root       8867 May 20  2007 boot.log.1
       -rw------- 1 root          root      17265 May 13  2007 boot.log.2
       -rw------- 1 root          root       2224 May  6  2007 boot.log.3
       -rw------- 1 root          root        105 Apr 29  2007 boot.log.4
       [root@mavis log]#

It's interesting to note that my current /etc/syslog.conf  and the one
in the older version both contain the entry:

         # Save boot messages also to boot.log
       local7.*                              /var/log/boot.log

Beyond ferreting out those details, I am LOST.