====== Installation ======

Install Bind, webserver with PHP and MySQL. For example on Debian:

<code>lighttpd php5-cgi mysql-server php5-mysql bind9</code>

===== DNS =====

Convince someone to forward a NS subdomain to you. For example:
<code>
dyn     IN   A     your.ip.address
d       IN   NS    dyn
</code>

===== Configure Bind =====

You need to configure a zone. If you don't have any, you can use example config files

  * named.conf.local - zone inclusion
  * zones.foo.master - zone specification
  * d.brmlab.cz - example zone (of course change it to your needs)

After configuration, your nameserver should be able to respond to "A ahoj.d.brmlab.cz." query.

We need to generate a user key that we will sign the updates with (with this you can also securely update a remote DNS server).

<code>dnssec-keygen -a HMAC-SHA1 -b 160 -n USER some.email.address.</code>

Two files are generated, K*key and K*private. Take the key from the *key one and put it to zone declaration (zones.foo.master in our case)

===== Configure dynamic updater =====

Put scripts from the shell/ directory somewhere. Edit config.sh.

Try update with <code>echo test a 9.10.11.12 | bash -x bind_update.sh</code>. You should be then able to resolve "A test.your.domain." to 9.10.11.12.

On Debian I had a problem that the /etc/bind directory was not owned by the user under which bind is running, so bind was unable to perform the update

===== Some security =====

The key should not be world-readable. You can create a separate user, chown & chmod 600 the key and all the scripts and then use the example sudoers file to run the update under that user.

===== Web frontend =====

Create a MySQL database. I use [[http://www.adminer.org/|Adminer]] GUI, but if you want to go with the command line, it will be something like this
<code>
CREATE DATABASE `kiviak`;

CREATE USER 'kiviak'@'localhost' IDENTIFIED BY PASSWORD 'XXXYYY';
GRANT ALL PRIVILEGES ON `kiviak`.* TO 'kiviak'@'localhost';
</code>
Then execute schema.sql to create the table.

Point your webserver to files in web/ folder. These files don't have to be writable by the webserver.

Edit config.php to reflect your environment.

Enjoy.

===== Misc. =====

The delete.php script deletes hostnames that have not been updated for more than a month. You can add it to your crontab.