I can't believe the response rate on this forum! Thanks to all of you.
Yes, now I remember that I had to use chkconfig for setting up my
Mongrel cluster as a service...
But before I try this out, I'd like to know what difference there is
between copying the nginx executable into /etc/init.d and using
chkconfig, on one hand, and copying the nginx executable into
/etc/rc.local, on the other hand.