Basel Darvish DBassel

Kubernetes on DigitalOcean with CoreOS

Let's look at an example of how to launch a Kubernetes cluster from scratch on DigitalOcean, including kubeadm, an Nginx Ingress controller, and Letsencrypt certificates.

Overview

Environment

We'll be creating a four-node cluster (k8s-master, k8s-000...k8s-002), load balancer, and ssl certificates.

Summary of book "Clean Architecture" by Robert C. Martin

Uncle Bob, the well known author of Clean Code, is coming back to us with a new book called Clean Architecture which wants to take a larger view on how to create software.

Even if Clean Code is one of the major book around OOP and code design (mainly by presenting the SOLID principles), I was not totally impressed by the book.

Clean Architecture leaves me with the same feeling, even if it's pushing the development world to do better, has some good stories and present robust principles to build software.

The book is build around 34 chapters organised in chapters.

Справочник переехал: https://github.com/hflabs/city

Free Programming Ebooks - O'Reilly Media

Requirements

Minikube requires that VT-x/AMD-v virtualization is enabled in BIOS. To check that this is enabled on OSX / macOS run:

sysctl -a | grep machdep.cpu.features | grep VMX

If there's output, you're good!

Prerequisites

README

The example below creates a TCP server listening on a stream (i.e. SOCK_STREAM) socket. A similar approach can be followed to create a UDP server on a datagram (i.e. SOCK_DGRAM) socket. See man systemd.socket for details.

An example server

Create an simple echo server at ~/tmp/foo/serve.py.

	#!/bin/bash
	## Executing this script is not a guarantee for a secure host!
	## This script is a collection of the junk I have found on my hosts and what
	## the SaltStack community gave as input. We have seen this attack evolve.
	## Please have a very close look at your systems and consider reinstalling them
	## to be absolutely sure you are free of malware.

	# remove crontab persistence
	for i in 54.36.185.99 217.8.117.137 176.31.60.91 217.12.210.192 54.36.185.99 54.36.185.99 89.223.121.139 torsocks anagima3 sa.sh$ c.sh$ selcdn.ru salt-store; do


	# make sure zfs autoexpand is enabled (only needed once)
	sudo zpool set autoexpand=on lxd

	sudo truncate -s 50G /var/lib/lxd/zfs.img

	# Make zfs realize the fact that partition has been changed and make zpool
	# use the new partition which is actually the same one
	sudo zpool online -e lxd /var/lib/lxd/zfs.img /var/lib/lxd/zfs.img

	# The cleanest way is to not use the system python at all (like rbenv for Ruby)

	brew install python
	pip2 install --upgrade pip setuptools
	pip2 install --upgrade python-openstackclient