I replaced Mac OS X Server 10.4 with Mac OS X 10.5 in Mac mini (Core Duo).

Then I needed set up named (BIND) manually, but named is disabled as default. You have to execute the command below.

# sudo launchctl load -w org.isc.named.plist.

This boots up named and enables named settings in the plist (/System/Library/LaunchDaemons/org.isc.named.plist)

And do not forget to make rndc.key before starting up named.

# rndc-confgen -a

This makes rndc.key in /etc/ directory.