How to start a chroot jail?

I was reading an article on how it is very important to setup a chroot jail to run bind. I can follow what the article says but one thing I am unclear about is now on system boot the BIND process in the chroot jail will start since it the owner will no longer be root but some other user. Can someone explain how to configure for this?

That's explained here:

Chroot-BIND HOWTO

Regards