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Ruby

1. Outside ENV strings are frozen:

example.rb:

ENV['foo'].strip!

Run:

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How to run Chef-Solo programmatically:

require 'chef'
require 'chef/application/solo'

Chef::Config[:solo_legacy_mode] = true
Chef::Config[:cookbook_path] = [File.join(File.absolute_path(File.dirname(__FILE__)), 'cookbooks')]

chef_client = Chef::Application::Solo.new

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Platform: Ubuntu 16.04

1. It is common practice to create swap that equals to your RAM. So firstly, you should find out your RAM:

free -m

Which outputs like:

 total used free shared buff/cache available

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This guide assumes you've configured your ENI inside linux instance. After you've assigned second ip address to your ENI in the AWS console, you need to reconfigure your interface inside intance.

Assume your interface name: eth1 Assume your second ip: $second_ip From the guide, mentioned above, the content of /etc/network/interfaces.d/eth1.cfg should look like:

auto eth1
iface eth1 inet static
 address $your_ip_addr

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Use the delegate instance methods flexibly in class:

require 'forwardable'

class MyHash

  extend(Forwardable)

 include(Enumerable)

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Chef: add node attributes automatically

Using knife exec

The best way probably

knife exec -E "nodes.find(:name => 'chef-node') { |node|  node.normal_attrs['some_key'] = 'some_value'; node.save; }"

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AMI: ubuntu 16.04

Create and assign ENI
Assume additional interface name: eth1
Assume its private ip: 10.170.224.57
Assume mask: 255.255.0.0 (16)

Inside instance:

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1. Add docker repo

sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"

2. Update

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#!/usr/bin/env bash

function perform_backup(){
    echo -n "Copying some stuff on S3.."
    echo "Done!"
}

perform_backup

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Lightweight script to install Docker CE and docker-compose on Ubuntu.

To run script simply execute:

curl https://gist.githubusercontent.com/metallica127/a6c1960502ae8ef61782f527eed1e343/raw/51cbf65b1fe1e213725822354ad16c479b928239/install_docker_compose.sh | sudo bash -s