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Understanding FreeBSD Jails

What is a Jail? Jails are one of the most useful features offered by FreeBSD. This technology, introduced with FreeBSD 4.0, allows system administrators, developers or any other kind of users to create multiple user-space instances that are fully isolated from the rest of the operating system. Jails are considered the standard way to obtain OS-level virtualization on BSD systems. OS-level virtualization is a particular kind of virtualization technology that operate on the OS-level; in that way the host’s kernel allows the execution of multiple isolated user-space instances (called containers, Zones or Jails) which they all share host’s resources, such as network stack, disk and the kernel.
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Resizing UFS/ZFS Partitions On FreeBSD

How to grow a UFS/ZFS partition under FreeBSD
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