Upgrading from 4 to 6

[Diomidis Spinellis]

With the EOL of FreeBSD 4.X coming close, I'm in the process of 
upgrading to 6.2.  According to
http://www.freebsd.org/releases/5.4R/migration-guide.html#UPGRADE

   "Probably the most straightforward approach is that of ``backup 
everything, reformat, reinstall, and restore user data''."

However, things are not that simple, because a system typically has many 
configured files, other than user data.  I'm currently setting up a new 
6.2 system on a VMWare host trying to mirror the existing system.

After a clean installation of 6.2, I also installed ports and some CPAN 
modules.  I then configured the apache configuration files, the sendmail 
local host file, the named masters and configuration file, 
/etc/inetd.conf, /etc/rc.conf, and the imap certificates.  Just before 
the switchoover, I'll also also need to copy the users parts of 
/etc/passwd* and /etc/group, the mail aliases, the httpd logs, the user 
mailboxes in /var/mail, and, of course, /home.

However, I have an uneasy feeling I may miss copying/adjusting some 
files.  Although I've documented the changes I made to the original 
system from 2002 onward, the documentation is a 1000-line file and I 
can't be sure it is 100% complete or that I will spot all required changes.

Is there a checklist or a procedure for restoring a 4.X system 
configuration to a system running 6.X?  Am I missing any obvious files 
or directories I should copy over?

Diomidis Spinellis - http://www.spinellis.gr