[Zope] How best to restart Zope?

Hello Q: How to make sure Zope restarts automatically it is shut down ? Zope version: Zope 2.2.0 (binary release, python 1.5.2, linux2-x86) Python version: 1.5.2 (#10, Dec 6 1999, 12:16:27) [GCC 2.7.2.3] Linux2.2.5-15 RedHat6.0 (Hedwig) any ideas? tia - Jason