Notes about creating FreeBSD jails

Something like that:

/bin/sh
mkdir /var/jails && cd /var/jails

for D in `ls`; do
mkdir -p $D/root $D/bin $D/dev $D/etc $D/lib $D/libexec $D/tmp $D/usr $D/var $D/home/$D
chmod o+rwxt $D/tmp
mtree -deU -f /etc/mtree/BSD.var.dist -p $D/var
done

cd /usr/src
for D in `ls /var/jails/`; do
make distribution DESTDIR=/var/jails/$D
done


cat >> /etc/rc.conf
# Jails
jail_enable="YES"
jail_mount_enable="YES"
jail_sysvipc_allow="YES"
jail_list="jail1 jail2 jail3"

## jail1
jail_jail1_name="jail1"
jail_jail1_hostname="jail1.com"
jail_jail1_ip="127.0.0.10/8"
jail_jail1_interface="lo0"
jail_jail1_rootdir="/var/jails/jail1"
jail_jail1_devfs_enable="YES"
jail_jail1_devfs_ruleset="devfsrules_jail"

## jail2
jail_jail2_name="jail2"
jail_jail2_hostname="jail2.com"
jail_jail2_ip="127.0.0.20/8"
jail_jail2_interface="lo0"
jail_jail2_rootdir="/var/jails/jail2"
jail_jail2_devfs_enable="YES"
jail_jail2_devfs_ruleset="devfsrules_jail"


## jail3
jail_jail3_name="jail3"
jail_jail3_hostname="jail3.com"
jail_jail3_ip="127.0.0.30/8"
jail_jail3_interface="lo0"
jail_jail3_rootdir="/var/jails/jail3"
jail_jail3_devfs_enable="YES"
jail_jail3_devfs_ruleset="devfsrules_jail"

^D


cat /etc/fstab.jail1
/var/jails/ruby/bin /var/jails/jail1/bin nullfs ro 0 0
/var/jails/ruby/lib /var/jails/jail1/lib nullfs ro 0 0
/var/jails/ruby/libexec /var/jails/jail1/libexec nullfs ro 0 0
/var/jails/ruby/usr /var/jails/jail1/usr nullfs ro 0 0
tmpfs /var/jails/jail1/tmp tmpfs rw,size=1G 0 0