I’ll be using FreeBSD 10.0 AMD64 with root on ZFS, but you can follow these instructions as long as you have a ZFS pool on the system. It is assumed that the system is already installed and basic configuration is complete.

It should be noted that the benefit from using ZFS clones will more or less vanish if you do a major ‘world’ upgrade on the jail, for example upgrading from FreeBSD 9.2 to FreeBSD 10.0. This won’t be a problem for my setup as I’ll eventually get around to configuring sysutils/py-salt to automatically deploy my jails, and I’ll post about it when I do.
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