How install Aegir octopus High performance Hostmaster for Drupal

I have tried install BOA-3.0.2 to host my many Drupal sites and I have struggled a lot install it. I am hopping this write up may help someone to have better experience.

This is the description from the smart people who developed this software/script.

BOA is an acronym of high performance Barracuda, Octopus and Aegir LEMP stack.

Includes all-in-one bash scripts (see docs/INSTALL.txt for details) to install
and upgrade high performance Aegir Hosting Systems for Drupal, with Nginx, PHP-FPM, Zend OPcache, MariaDB and Redis.

What is Octopus?

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