Convert FreeBSD 10 Jails from rc.conf to jail.conf
FreeBSD jails used to be defined in /etc/rc.conf using rc-style syntax. During
FreeBSD 9.x, a new convention was introduced, using /etc/jail.conf. FreeBSD
10.x defaults to the new style but still supports the rc.conf style. FreeBSD 11
will probably drop support for the old style.
Old style (/etc/rc.conf)
While your jails are still running under the old style, have a look at /var/run/jail*.conf. Create an initial /etc/jail.conf using the generated files /var/run jail files:
New style (/etc/jail.conf)
Remove everything from rc.conf except for the jail_enable line. If FreeBSD 9.x,
change jail_enable to jail2_enable. Also, move everything shared to the global
scope to clean up the individual definitions.