sysutils/jailadmin is a system for managing a set of named jails.
It is designed to provide more flexible functionality than FreeBSD's own /etc/rc.d/jail script and provides the following features:
A command line utility for starting and stopping named jails.
An efficient method for shutting down a large number of jails in parallel.
A simple configuration syntax.
SNMP monitoring facilities.
I have never used this utility but you might want to play with it. The SNMP monitoring sounds good.
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