Use apt behind proxy server on Ubuntu 18.04

There's no greater frustation of trying to troubleshoot on a system for many hours (or days) while the solution was under our nose for all the time.

Elastic stack starter kit

> There are only two hard things in Computer Science: cache invalidation and naming things. - Phil Karlton Problem How

Table of contents 0. Intro 1. Before to start 1.1 12 Factor 1.2 Lint your manifests 1.3

Single-Node Patterns in distributed systems