Chamilo 1.11 on Raspberry Pi 3 for off-the-grid situations

This article can be considered an update of our first article on installing Chamilo (on a Raspberry Pi B+). This time, we are testing it with Raspberry 3, as of the 1st of April 2017 (no joke intended). Last time, we were testing with Chamilo 1.9, which is arguably less load-intensive, considering it doesn't include any Symfony component, and it doesn't require any .htaccess configuration.

gem install mysql2 on Debian Wheezy with MariaDB 10

Just in case you would be in this situation (and given the fact I couldn't find online information about it), if you are ever installing the mysql2 gem on a Debian Wheezy system with MariaDB 10 (I would guess a rather rare situation), you might get this error: 
# gem install mysql2 -v=0.3.11
Building native extensions. This could take a while...
ERROR: Error installing mysql2:
 ERROR: Failed to build gem native extension.

 /usr/bin/ruby1.9.1 extconf.rb
checking for rb_thread_blocking_region()... yes
checking for rb_wait_for_single_fd()...

Howto install OpenMeetings 2.2 server on a Debian Wheezy box

This guide is written specifically to cover a lack of quality documentation for the installation procedure of an OpenMeetings 2.2 server on a Debian Wheezy box. It will be based on the manual available already for this procedure (but relatively badly structured and written in a rather improvable English), by Alvaro Bustos with the help of Federico Christian Tomasczik. Thanks to both of them. My manual is mostly a rewrite of the information in their guide, hopefully with enough precision to allow someone to script it.

Xhprof + PHP5.4 + Ubuntu + Chamilo 1.10dev

(Read the update below before starting to copy-paste) To install Xhprof on PHP5.4 on Ubuntu (assuming you've already got PHP5.4 from Andrej or somewhere safe) in order to measure the load of Chamilo 1.10 dev (you need to have a mercurial clone, otherwise the "tests" directory will not exist), follow this procedure (all lines prefixed with # are comments): 
cd /tmp
sudo apt-get install php5-dev php-pear
pecl bundle xhprof
cd xhprof
# Here you will have to apply the patch mentioned here: https://bugs.php.net/bug.php?id=61674 to your extension/xhprof.c file (otherwise it won't compile

Creating a software RAID array on an already installed Ubuntu 11.04

Let's say you got confused by a misleading fake-RAID feature on an HP Blade server and you decided to ignore that the Ubuntu installer was telling you it found 2 disks while it was supposed (if it was actual hardware RAID) to be detecting only one. And let's say you are lucky to have 3 disks, and you only one to use two as the RAID array (and they do not contain your operating system, i.e. the / partition). You might wonder: "And now what? S**** you, HP!" (that last bit is if you left panic get you, of course).
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