FreeBSD Handbook
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# Chapter 15 Jails

Contributed by Matteo Riondato.

# 15.1 Synopsis

This chapter will provide an explanation of what FreeBSD jails are and how to use them. Jails, sometimes referred to as an enhanced replacement of chroot environments, are a very powerful tool for system administrators, but their basic usage can also be useful for advanced users.

After reading this chapter, you will know:

- What a jail is, and what purpose it may serve in FreeBSD installations.

- How to build, start, and stop a jail.

- The basics of jail administration, both from inside and outside the jail.

Other sources of useful information about jails are:

- The jail(8) manual page. This is the full reference of the `jail` utility -- the administrative tool which can be used in FreeBSD to start, stop, and control FreeBSD jails.

- The mailing lists and their archives. The archives of the FreeBSD general questions mailing list and other mailing lists hosted by the FreeBSD list server already contain a wealth of material for jails. It should always be engaging to search the archives, or post a new question to the freebsd-questions mailing list.

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