Currently a "/etc/rc.d/jail stop" just kills all processes in the individual jails. If /etc/default/rc.conf's default way of booting the jails (jail_exec="/bin/sh /etc/rc") is used this is a rather crual approach IMHO. I think if the jail is booted through /etc/rc it also should be given the chance to shutdown via /etc/rc.shutdown. If then there are still processes remaining, the killall(1) is fine, of course. This way packages and other sub-systems have the chance to perform a graceful shutdown.
Definitely a good plan. You just have to watch out for environment variable leakage into the jail subsystem when using jexec. A minor concern, perhaps.
This is what the jkill from the jailutils package does: http://memberwebs.com/nielsen/freebsd/jails/jailutils
Cheers, Nate
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