I want to implement a number of jails for different services on a single

Since /usr is the same everywhere I'd like to just mount one copy of it
read-only to all the jails and then have them each have their own /usr/local

well - i already do this, but both /usr and /usr/local are common

simply install in /usr/local everything all jail users needs.

Someone recommended keeping the main system's /usr separate. This would mean
building a /usr for the main system and then making a copy of it
to be shared by the jails.

Aesthetics and philosophy aside, are there any real security holes in just
using the systems /usr everywhere if it is mounted read only in the jails?

no it works fine AND saves memory, all binaries are shared

use mount_nullfs -o readonly for this.

link /usr/local/etc to for example /etc/local so configs can be different in every jail
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