Last Updated on October 17, 2012 by Till Brehm
This tutorial is about chrooting a BIND (named) installation on Debian 6. Chrooting is used for security reasons, in case that BIND gets hacked on the server, the hacker is jailed into the chroot and can not get access to other services.
apt-get install bind9
to install BIND9.
For security reasons we want to run BIND chrooted so we have to do the following steps:
Edit the file /etc/default/bind9 so that the daemon will run as the unprivileged user bind, chrooted to /var/lib/named. Modify the line: OPTIONS="-u bind" so that it reads OPTIONS="-u bind -t /var/lib/named":
# run resolvconf?
# startup options for the server
OPTIONS="-u bind -t /var/lib/named"
Create the necessary directories under /var/lib:
mkdir -p /var/lib/named/etc
mkdir -p /var/lib/named/var/cache/bind
mkdir -p /var/lib/named/var/run/bind/run
Then move the config directory from /etc to /var/lib/named/etc:
mv /etc/bind /var/lib/named/etc
Create a symlink to the new config directory from the old location (to avoid problems when BIND gets updated in the future):
ln -s /var/lib/named/etc/bind /etc/bind
Make null and random devices, and fix permissions of the directories:
mknod /var/lib/named/dev/null c 1 3
mknod /var/lib/named/dev/random c 1 8
chmod 666 /var/lib/named/dev/null /var/lib/named/dev/random
chown -R bind:bind /var/lib/named/var/*
chown -R bind:bind /var/lib/named/etc/bind
We need to create the file /etc/rsyslog.d/bind-chroot.conf...
... with the following line so that we can still get important messages logged to the system logs:
Restart the logging daemon:
Start up BIND, and check /var/log/syslog for errors:
Thanks to Falko Timme from Howtoforge.com for this tutorial.