This document will describe the setup of jail(8) and how-to configure all applications to work properly within a jail(8). It has the following design criteria/assumptions:

• file:/usr/ports is shared throughout all installations (so are all the configuration for the ports then) and every system build all ports himself.
• The sample jail is called pzwet and is located in file:/usr/jail/pzwet and has IP 178.63.108.109 assigned to it.
• All services dependencies are within their own jail, so I can start and stop jails without affecting the others.
• My sendmail setup has spam filtering --powered by file:mail/spamass-milter-- support for incoming email only.

Important: Your jail server should not run any public facing services which does 'wildcard' binding to IP addresses, else it will 'claim' the service before your jail can take it. Tip: Jails does NOT have a local loopback device, so you will need to use UNIX sockets on places you would normally use the loopback address.

First make sure to install the jail using the ​method in the handbook

pzwet# cat <<EOF >> /etc/rc.conf
#
# Base Services
sshd_enable="YES"
syslogd_flags="-ss"

sendmail_enable="YES"

# saving entropy bits is not useful within jails, as your host will do handle this.
entropy_dir="NO" 
# Get some jitter in your cron runs to make sure the does not all run at time same time. 
# Do NOT use if you rely on having your process to start at 'exact' that time.
cron_flags="-J10"

#
# Port Services
spamass_milter_enable="YES"
spamass_milter_localflags="-i 178.63.108.109,0.0.0.0 -r -1 -- -U /var/run/spamd.sock"

spamd_enable="YES"
spamd_flags="--socketpath=/var/run/spamd.sock --nouser-config --username=nobody"

EOF

pzwet# make -C /usr/ports/security/sudo WITH_INSULTS=yes BATCH=yes install clean pzwet# make -C /usr/ports/devel/subversion WITH_MOD_DAV_SVN=yes APACHE_VERSION=22 BATCH=yes install clean pzwet# make -C /usr/ports/ports-mgmt/portaudit BATCH=yes install clean; /usr/local/sbin/portaudit -Fda pzwet# make -C /usr/ports/editors/vim-lite BATCH=yes install clean pzwet# make -C /usr/ports/mail/spamass-milter BATCH=yes install clean

Update port INDEX tree and report on pending upgrades every Saturday: pzwet# echo '0 3 * * sat root /usr/sbin/portsnap -I cron update && /usr/sbin/pkg_version -vIL=' >> /etc/crontab