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11<body>
12<h1 id="automated-zone-generation-using-cron">Automated zone generation using cron</h1>
13<h2 id="refresher-on-fred">Refresher on FRED</h2>
14<p>Remember the prerequisites for creating objects in the Fred DB (from https://fred.nic.cz/page/2906/installation-ubuntu/ and https://fred.nic.cz/page/699/fred-client-how-to/</p>
15<ol style="list-style-type: decimal">
16<li>Make sure you have an existing contact, or create one</li>
17<li>Make sure you have an NS-set, or create one, and associate it to the contact</li>
18<li>Once the above are fulfilled, you can create a domain, referencing the contact and NS-set</li>
19</ol>
20<p>From the Ubuntu installation above, you remember running this command near the end:</p>
21<p><code>genzone_client</code></p>
22<p>... if you remember, this automatically generated (created and wrote the contents) all the zones to disk.</p>
23<p>Let's create a place where we can export our zones:</p>
24<pre><code>cd
25mkdir zones
26cd zones
27pwd</code></pre>
28<p>The 4 commands above make sure you that:</p>
29<ul>
30<li>you are in your home directory (<code>cd</code>)</li>
31<li>a directory &quot;zones&quot; exist (<code>mkdir zones</code>)</li>
32<li>you change the current working directory to &quot;zones&quot; (<code>cd zones</code>)</li>
33<li>you verify that you are indeed placed inside this directory (<code>pwd</code>)</li>
34</ul>
35<p>Once you've done this, let's run the <code>genzone_client</code>:</p>
36<pre><code>genzone_client</code></pre>
37<p>Then</p>
38<pre><code>ls -l</code></pre>
39<p>... you should see at list one file, for the zone of the domain for the TLD that was created when you installed FRED.</p>
40<p>For example, you may see:</p>
41<pre><code>-rw-rw-r-- 1 sysadm sysadm 719 Jun  1 07:19 db.dk</code></pre>
42<h2 id="automate-zone-generation">Automate zone generation</h2>
43<p>Now, we would like to have the above &quot;zone generation&quot; take place automatically, so we don't need to remember to do it manually every time we make changes in the zone.</p>
44<p>It turns out that the FRED packages have this already configured!</p>
45<pre><code>cat /etc/cron.d/pyfred-genzone </code></pre>
46<p>You should see:</p>
47<pre><code>*/30 *  * * *   root    /usr/bin/genzone_client</code></pre>
48<p>Every 30 minutes of every hour, every day, every month, all weekdays, run the commands &quot;<code>/usr/bin/genzone_client</code>&quot;</p>
49<p>By default, the zones are being written to the <code>/root</code> directory. You can go there and look:</p>
50<pre><code>cd /root
51ls -l</code></pre>
52<p>Do you see any zone files ?</p>
53<h2 id="the-details">The details</h2>
54<p>Let's look at the format above, called a <code>crontab</code>:</p>
55<pre><code>Minute  Hour    Day-of-Month    Month   Day-of-Week     User    Command [params]</code></pre>
56<p>For example, if we wanted to say &quot;hello&quot; at 5 minute past the hour on every hour, Monday to Friday, we would write:</p>
57<pre><code>5   *   *   *   *   1-5     root    echo &quot;hello&quot;</code></pre>
58<p>This reads as:</p>
59<p>At 5 minute past the hour, every hour, every day, every month, Mon-Fri, say hello (as the <code>root</code> user)</p>
60<p>The crontab for <code>pyfred-genzone</code> can be modified, so instead of running every 30 minutes, we're going to make it run every 5 minutes.</p>
61<pre><code>sudo vi /etc/cron.d/pyfred-genzone</code></pre>
62<p>Modify the line</p>
63<pre><code>*/30 *  * * *   root    /usr/bin/genzone_client</code></pre>
64<p>And change '30' to '5'</p>
65<pre><code>*/5 *  * * *   root /usr/bin/genzone_client</code></pre>
66<p>The above reads as:</p>
67<p>Every 5 minutes of every hour, every day, every month, all weekdays, run the commands &quot;<code>/usr/bin/genzone_client</code>&quot;</p>
68<p>Once you've change the line, save the file and exit.</p>
69<p>Now instead of waiting 5 minutes, let's start configure BIND!</p>
70</body>
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