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FreeBSD Jail Creation

Create a template dataset

zfs create -o mountpoint=/usr/local/jails zroot/jails
zfs create -p zroot/jails/template

Download the base files into a new directory

mkdir ~/jails
fetch ftp://ftp.freebsd.org/pub/FreeBSD/releases/amd64/amd64/11.1-RELEASE/base.txz -o ~/jails

Extract the base files into the template directory (mountpoint)

tar -xf ~/jails/base.txz -C /usr/local/jails/template

Copy the resolv.conf file from host to template so that we have working DNS resolution

cp /etc/resolv.conf /usr/local/jails/template/etc/resolv.conf

When finished, take a snapshot. Anything after the '@' symbol is the snapshot name. You can make changes to the template at any time, just make sure that you take another snapshot when you are finished and that any subsequently created jails use the new snapshot.

zfs snapshot zroot/jails/template@1

New jails can then be created by cloning the snapshot of the template dataset

zfs clone zroot/jails/template@1 zroot/jails/testjail

Add the jails configuration to /etc/jail.conf

# Global settings applied to all jails

interface = "re0";
host.hostname = "$name";
ip4.addr = 192.168.1.$ip;
path = "/usr/local/jails/$name";

exec.start = "/bin/sh /etc/rc";
exec.stop = "/bin/sh /etc/rc.shutdown";
exec.clean;
mount.devfs;

# Jail Definitions
testjail {
$ip = 15;
}

Run the jail

jail -c testjail

View running jails

jls

Login to the jail

jexec testjail sh

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