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app = "app-name"
kill_signal = "SIGINT"
kill_timeout = 5

[deploy]
  release_command = "bin/hanami db migrate"

[env]
  HANAMI_ENV="production"

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FROM ruby:2.3.1

# Install dependencies
RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs

# Set an environment variable where the Rails app is installed to inside of Docker image:
ENV RAILS_ROOT /var/www/app_name
RUN mkdir -p $RAILS_ROOT

# Set working directory, where the commands will be ran:

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SETUP VPS

based on DigitalOcean guide

Create local project

local$ rails new appname -T -d postgresql
local$ rails g scaffold Story title:string body:text
local$ rails db:migrate

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Autofs on Mac OS X

With autofs you can easily mount network volumes upon first access to the folder where you want to mount the volume. Autofs is available for many OS and is preinstalled on Mac OS X so I show you how I mounted my iTunes library folder using this method.

Prepare autofs to use a separate configuration file

autofs needs to be configured so that it knows where to gets its configuration. Edit the file /etc/auto_master and add the last line:

#
# Automounter master map
#

+auto_master # Use directory service

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true and false vs. "truthy" and "falsey" (or "falsy") in Ruby, Python, and JavaScript

Many programming languages, including Ruby, have native boolean (true and false) data types. In Ruby they're called true and false. In Python, for example, they're written as True and False. But oftentimes we want to use a non-boolean value (integers, strings, arrays, etc.) in a boolean context (if statement, &&, ||, etc.).

This outlines how this works in Ruby, with some basic examples from Python and JavaScript, too. The idea is much more general than any of these specific languages, though. It's really a question of how the people designing a programming language wants booleans and conditionals to work.

If you want to use or share this material, please see the license file, below.

Update

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Safest way to clean up boot partition - Ubuntu 14.04LTS-x64, Ubuntu 16.04LTS-x64

Reference

Case I: if /boot is not 100% full and apt is working

1. Check the current kernel version

$ uname -r 

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FROM crystallang/crystal:0.27.2 as builder

RUN apt-get update \
    && apt-get install -y --no-install-recommends build-essential  \
    apt-transport-https curl ca-certificates gnupg2 apt-utils

RUN curl -sL https://deb.nodesource.com/setup_10.x | bash - \
    && apt-get install -y nodejs

RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \

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AllCops:
  RunRailsCops: true

# Commonly used screens these days easily fit more than 80 characters.
Metrics/LineLength:
  Max: 120

# Too short methods lead to extraction of single-use methods, which can make
# the code easier to read (by naming things), but can also clutter the class
Metrics/MethodLength: 

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FROM crystallang/crystal:0.27.2

WORKDIR /opt/src

# Install nodejs
COPY bin ./bin
RUN bin/nodesource_11.x
RUN apt-get update && apt-get install -y nodejs

# npm install

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We develop locally on MacOS. Due to some issues with cross compilation, we build the crystal binary on docker locally,
then zip that up and ship that along with the docker stuff to elasticbeanstalk.