This is the process of setting up erlang, rebar3, and cowboy for a Hello World, starting with a clean Debian 8 install.
Update apt and install deps:
root@046edcaea45a:~# apt-get update
root@046edcaea45a:~# apt-get install erlang erlang-dev gcc
root@046edcaea45a:~# wget https://s3.amazonaws.com/rebar3/rebar3
root@046edcaea45a:~# mkdir ~/bin/
root@046edcaea45a:~# mv rebar3 ~/bin/
root@046edcaea45a:~# chmod +x ~/bin/rebar3 
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; Ant sim ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
| ; Copyright (c) Rich Hickey. All rights reserved. | |
| ; The use and distribution terms for this software are covered by the | |
| ; Common Public License 1.0 (http://opensource.org/licenses/cpl.php) | |
| ; which can be found in the file CPL.TXT at the root of this distribution. | |
| ; By using this software in any fashion, you are agreeing to be bound by | |
| ; the terms of this license. | |
| ; You must not remove this notice, or any other, from this software. | |
| ;dimensions of square world |