Nguyen Hoang Nam nghnam

Chapter 1 - Object Oriented Design

The purpose of design is to allow you to do design later, and it's primary goal is to reduce the cost of change.

Single Responsibility Principle: a class should have only a single responsibility
Open-Closed Principle: Software entities should be open for extension, but closed for modification (inherit instead of modifying existing classes).
Liskov Substitution: Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.
Interface Segregation: Many client-specific interfaces are better than one general-purpose interface.

MicroService Proxy Gateway Solutions

Kong, Traefik, Caddy, Linkerd, Fabio, Vulcand, and Netflix Zuul seem to be the most common in microservice proxy/gateway solutions. Kubernetes Ingress is often a simple Ngnix, which is difficult to separate the popularity from other things.

Github Star Trend:

This is just a picture of this link from March 2, 2019

Originally, I had included some other solution

Bucket Policy

Bucket policy is an access policy available for you to grant anonymous permissions to your Minio resources. Bucket policy uses JSON-based access policy language.

This section presents a few examples of typical use cases for bucket policies. The policies use testbucket strings in the resource value. To test these policies, you need to replace these strings with your bucket name. For more information please read Amazon S3 access policy language

Granting Read-Only Permission to an Anonymous User

The following example policy grants the s3:GetObject permission to any public anonymous users. This permission allows anyone to read the object data under testbucket, which is useful for when you have publicly readable assets. A typical example is a website assets stored in testbucket.

DevOps started out as "Agile Systems Administration". In 2008, Andrew Shafer did a talk called "Agile Infrastucture" addressing issues around involving more of the company in the same disciplines as programmers.

In 2009, Patrick Debois created "DevOpsDays" conference to help to bring it to light. However, it wouldn't begin to trend until about 2010, when people would begin to describe it as a standalone discipline.

Today, DevOps goes beyond just developers, systems administration and infrastructure, its about [dev, ops, agile, cloud, open source and business](https://blogs.the451group.com/opensource/2010/03/03/devops-mixing-dev-ops-agile-cloud-open-source-and-busi

# Prerequisites: netcat-openbsd (BSD version of netcat)
$ ssh -fND 127.0.0.1:8081 user@<your-vps>
$ git config --global url."https://github".insteadOf git://github
$ git config --global http.proxy 'socks5://127.0.0.1:8081'
$ echo -e 'Host github.com\nProxyCommand nc -x 127.0.0.1:8081 %h %p' >> ~/.ssh/config

Alternative solutions:

https://cms-sw.github.io/tutorial-proxy.html (more verbose tutorial)

	#!/bin/bash -e

	# Usage ./k8s-service-account-kubeconfig.sh ( namespace ) ( service account name )

	TEMPDIR=$( mktemp -d )

	trap "{ rm -rf $TEMPDIR ; exit 255; }" EXIT

	SA_SECRET=$( kubectl get sa -n $1 $2 -o jsonpath='{.secrets[0].name}' )

	#!/usr/bin/env python

	import os
	import requests
	import uuid
	from random import randint
	from uuid import uuid4

	def read_in_chunks(file_object, chunk_size=65536):
	while True:

	#!/bin/sh
	docker rm -f $(docker ps -qa)
	docker volume rm $(docker volume ls -q)
	cleanupdirs="/var/lib/etcd /etc/kubernetes /etc/cni /opt/cni /var/lib/cni /var/run/calico /opt/rke"
	for dir in $cleanupdirs; do
	echo "Removing $dir"
	rm -rf $dir
	done

	#!/bin/bash

	# install CUDA Toolkit v9.0
	# instructions from https://developer.nvidia.com/cuda-downloads (linux -> x86_64 -> Ubuntu -> 16.04 -> deb)
	CUDA_REPO_PKG="cuda-repo-ubuntu1604-9-0-local_9.0.176-1_amd64-deb"
	wget https://developer.nvidia.com/compute/cuda/9.0/Prod/local_installers/${CUDA_REPO_PKG}
	sudo dpkg -i ${CUDA_REPO_PKG}
	sudo apt-key adv --fetch-keys http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64/7fa2af80.pub
	sudo apt-get update
	sudo apt-get -y install cuda-9-0

	Provisioning to use Calico
	1/20/2017
	First, tearing down the cluster, by doing this on each node:
	kubeadm reset
	rm -rf .kube
	systemctl start kubelet.service

	Did yum -y update on all nodes as well. Downloaded http://docs.projectcalico.org/v1.6/getting-started/kubernetes/installation/hosted/kubeadm/calico.yaml and then ran "kubectl create -f calico.yaml".

	Starting up cluster (with just the master node).