jailadmin is a light set of utilities based on Oracle Solaris zoneadm(1m), zonecfg(1m) and zlogin(1) to facilitate creation and maintenance of FreeBSD Jails.
There are three main utilities - jailadm, jailcfg and jlogin.
jailadm - responsible for installing, uninstalling, booting and halting jails
jailcfg - responsible for the configuration of jails
jlogin - quick shell access to the jail