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Please search this HN comment thread for "jail" and my own comment - I am curious about your thoughts ...

• api 9y ago
  Jails are closer. They are perhaps a way of achieving some of this. The problem (unless I'm wrong) is that you need root to create one, so you are back to needing root for everything.
  • rsync 9y ago
    Yes, of course the base systems root is necessary to create the jail, but then the jail has its own root user as well as its own /etc/passwd (and /etc/everythingelse). For many, many purposes (almost all ?) a FreeBSD jail is indistinguishable to the root user from a bare metal server.