Update doc for upgrading Ubuntu 14.04 to 16.04.

en_US/upgrade/0-upgrade.ubuntu.14.04-16.04.md

@@ -5,13 +5,21 @@
 ## Postfix
 
 ```
-postconf -e daemon_directory='/usr/lib/postfix/sbin’
+postconf -e daemon_directory='/usr/lib/postfix/sbin'
 postconf -e shlib_directory='/usr/lib/postfix'
 ```
 
 * Incorrect `daemon_directory` causes Postfix cannot start.
 * Incorrect `shlib_directory` causes Postfix cannot find pcre/mysql/pgsql/ldap modules.
 
+## iRedAPD
+
+iRedAPD requires package `python-pymysql`:
+
+```
+apt -y install python-pymysql
+```
+
 ## PHP [OPTIONAL]
 
 > NOTE: This step is toally optional if you're fine with old PHP release.
@@ -21,3 +29,19 @@ php was not upgraded to 7.0 automatically, have to install them manually:
 ```
 apt-get install php-json php-gd php-mcrypt php-curl mcrypt php-intl php-xml php-mbstring php-mysql libapache2-mod-php
 ```
+
+### Nginx and php-fpm
+
+If you're running Nginx, you must install package `php-fpm` too:
+
+```
+apt install php-fpm
+```
+
+php-fpm daemon socket file is changed:
+
+* old one: `/var/run/php-fpm.socket`
+* new one: `/var/run/php/php7.0-fpm.sock`
+
+iRedMail hard-codes php-fpm socket file in `/etc/nginx/nginx.conf` or
+`/etc/nginx/conf.d/default.conf`, you must update them to use new socket file.

html/upgrade.ubuntu.14.04-16.04.html

@@ -20,13 +20,17 @@
 <ul>
 <li><a href="#fixes-you-need-after-upgrading-ubuntu-to-1604-from-1404">Fixes you need after upgrading Ubuntu to 16.04 from 14.04</a><ul>
 <li><a href="#postfix">Postfix</a></li>
-<li><a href="#php-optional">PHP [OPTIONAL]</a></li>
+<li><a href="#iredapd">iRedAPD</a></li>
+<li><a href="#php-optional">PHP [OPTIONAL]</a><ul>
+<li><a href="#nginx-and-php-fpm">Nginx and php-fpm</a></li>
+</ul>
+</li>
 </ul>
 </li>
 </ul>
 </div>
 <h2 id="postfix">Postfix</h2>
-<pre><code>postconf -e daemon_directory='/usr/lib/postfix/sbin’
+<pre><code>postconf -e daemon_directory='/usr/lib/postfix/sbin'
 postconf -e shlib_directory='/usr/lib/postfix'
 </code></pre>
 
@@ -34,13 +38,31 @@ postconf -e shlib_directory='/usr/lib/postfix'
 <li>Incorrect <code>daemon_directory</code> causes Postfix cannot start.</li>
 <li>Incorrect <code>shlib_directory</code> causes Postfix cannot find pcre/mysql/pgsql/ldap modules.</li>
 </ul>
+<h2 id="iredapd">iRedAPD</h2>
+<p>iRedAPD requires package <code>python-pymysql</code>:</p>
+<pre><code>apt -y install python-pymysql
+</code></pre>
+
 <h2 id="php-optional">PHP [OPTIONAL]</h2>
 <blockquote>
 <p>NOTE: This step is toally optional if you're fine with old PHP release.</p>
 </blockquote>
 <p>php was not upgraded to 7.0 automatically, have to install them manually:</p>
 <pre><code>apt-get install php-json php-gd php-mcrypt php-curl mcrypt php-intl php-xml php-mbstring php-mysql libapache2-mod-php
-</code></pre><div class="footer">
+</code></pre>
+
+<h3 id="nginx-and-php-fpm">Nginx and php-fpm</h3>
+<p>If you're running Nginx, you must install package <code>php-fpm</code> too:</p>
+<pre><code>apt install php-fpm
+</code></pre>
+
+<p>php-fpm daemon socket file is changed:</p>
+<ul>
+<li>old one: <code>/var/run/php-fpm.socket</code></li>
+<li>new one: <code>/var/run/php/php7.0-fpm.sock</code></li>
+</ul>
+<p>iRedMail hard-codes php-fpm socket file in <code>/etc/nginx/nginx.conf</code> or
+<code>/etc/nginx/conf.d/default.conf</code>, you must update them to use new socket file.</p><div class="footer">
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