FreePBX is an opensource front-end for the Asterisk VoIP solution. It can be installed on a Raspberry Pi via a prebuilt image but what if you want to use it directly on Raspbian (or other distros)? Well, it is possible with a few minor tweaks.
Because FreePBX and Asterisk are tightly bound it is a permissions nightmare to get the web interface to work with any other user than ‘asterisk’. If you already have Apache running for other purposes then this is obviously not ideal. For this reason we need to get second Apache process running as the ‘asterisk’ user, while at the same time allowing the main Apache process to run as is. Here’s how you do that.
You could just follow their instructions to the letter and they would work, however, it is highly likely you have Apache already running on Raspbian for other tasks, such as serving up web pages or other web based interfaces. If this is the case you probably don’t want to be changing the user it runs as.
This solution will also work for Debian, Ubuntu, CentOS etc but might need slightly tweaked.
In the official instructions there is a section titled ‘A few small modifications to Apache’.
STOP HERE! Don’t run this part:
A few small modifications to Apache. sed -i 's/\(^upload_max_filesize = \).*/\120M/' /etc/php5/apache2/php.ini cp /etc/apache2/apache2.conf /etc/apache2/apache2.conf_orig sed -i 's/^\(User\|Group\).*/\1 asterisk/' /etc/apache2/apache2.conf sed -i 's/AllowOverride None/AllowOverride All/' /etc/apache2/apache2.conf service apache2 restart
If you were to run those commands you would break your already working Apache configuration. Instead, we’re going to fire up a new Apache process.
Note: It might also be possible to work around this by not running PHP as a module but as a FastCGI executable (such as with PHP-FPM). Feel free to give that a go instead of using this method.
We are going to copy and modify the Apache configuration directory and tweak it. Firstly, copy the configuration directory to make a new one.
cp -a /etc/apache2 /etc/apache2_freebpx
Next, clean up any site configuration you may already have in place by removing the symlinks from sites-enabled and any custom configuration files etc.
In order to change the user Apache runs as and to allow a second instance to run there are a few required changes.
In /etc/apache2_freepbx/ports.conf change the port:
In /etc/apache2_freepbx/envvars change a few things:
SUFFIX=_freepbx export APACHE_RUN_USER=asterisk export APACHE_RUN_GROUP=asterisk
You will notice there are multiple variables which end in ‘$SUFFIX’. These will now have _freepbx appended to them, making them unique and therefore different from our main Apache process.
In /etc/apache2_freepbx/sites-enabled/000-default change the port:
Then run two of the suggested modifications as these are still required.
sed -i 's/\(^upload_max_filesize = \).*/\120M/' /etc/php5/apache2/php.ini sed -i 's/AllowOverride None/AllowOverride All/' /etc/apache2_freepbx/apache2.conf
Finally, we need to start this new Apache process. To do this we need the following commands.
source /etc/apache2_freepbx/envvars mkdir /var/run/apache2_freepbx/ apache2 -f /etc/apache2_freepbx/apache2.conf &
Tada! You should now have Apache running as ‘asterisk’ and listening on port 4080. You can browse to your Pi’s IP via a web browser at the address ‘http://192.168.x.x:4080’ and you should see the FreePBX interface.
In order to ensure this runs on start up you can add the last three commands we can to start Apache to the end of ‘/etc/rc.local’ – ensure they are at the bottom, before the ‘exit’.
You may wish to access FreePBX via your existing Apache server, for example if you want to use the standard ports, say 443 for SSL. To do this we can use the proxy module for Apache. To do this we need a new virtual host.
For example, create /etc/apache2/sites-available/freepbx.example.com with something like this:
<VirtualHost 192.168.xxx.xxx:80> ServerAdmin freepbx.example.com ServerName freepbx.example.com ErrorLog /dev/null CustomLog /dev/null combined ProxyRequests On ProxyPreserveHost On ProxyPass / "http://192.168.xxx.xxx:4080/" ProxyPassReverse / "http://192.168.xxx.xxx:4080/" </Virtualhost>
Then enable the site and the proxy module with:
a2enmod proxy a2enmod proxy_http a2ensite freepbx.example.com service apache2 reload
You should be able to access http://freepbx.example.com/ which is proxying to the other Apache instance on port 4080.