Sam samqi

Effective Engineer - Notes

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

	#!/bin/bash
	#rc.firewall
	#
	#
	# Firewall configuration file.
	#
	#
	# AUTHOR: José Lopes Oliveira Jr. <indiecode.com.br>
	#
	#

	# List virtual machines
	VBoxManage list vms
	"MyVM" {wwwwww-4301-4a7d-8af8-fe02fed00451}

	# Start VM in headless mode
	VBoxManage startvm MyVM --type headless

	# Power off VM
	VBoxManage controlvm MyVM poweroff

	#use awk to output history commands without the numbers
	awk '{print $2,$3,$4,$5,$6,$7}' history.txt >> commands.txt

	#get the ip addresses https://www.cyberciti.biz/tips/read-unixlinux-system-ip-address-in-a-shell-script.html
	ifconfig \| grep 'inet addr:'\| grep -v '127.0.0.1' \| cut -d: -f2 \| awk '{ print $1}'

	#get private and public IP for linode node via CLI (old version) https://github.com/linode/cli
	linode show linodenode\| grep ips \| awk '{ print $2,$3}'


	#check curl connection speed: https://coderwall.com/p/lwpszg/measuring-download-speed-from-the-command-line-with-curl
	curl -Lo /dev/null -skw "\ntime_connect: %{time_connect}s\ntime_namelookup: %{time_namelookup}s\ntime_pretransfer: %{time_pretransfer}\ntime_starttransfer: %{time_starttransfer}s\ntime_redirect: %{time_redirect}s\ntime_total: %{time_total}s\n\n" http://foolproofcode.com

	#example result:
	#time_connect: 0.074s
	#time_namelookup: 0.063s
	#time_pretransfer: 0.103
	#time_starttransfer: 0.278s
	#time_redirect: 0.067s

	#become root and add key
	sudo su -
	wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg\|apt-key add -
	echo "deb http://build.openvpn.net/debian/openvpn/stable xenial main" > /etc/apt/sources.list.d/openvpn-aptrepo.list
	apt-get update && apt-get install openvpn

	#Based Linode Hardened https://www.linode.com/docs/networking/vpn/set-up-a-hardened-openvpn-server/
	#require signed HMAC sig file for access
	openvpn --genkey --secret /etc/openvpn/server/ta.key
	openssl genpkey -genparam -algorithm DH -out /etc/openvpn/server/dhp4096.pem -pkeyopt dh_paramgen_prime_len:4096

	git clone https://github.com/speed47/spectre-meltdown-checker.git
	cd spectre-meltdown-checker/
	sudo sh spectre-meltdown-checker.sh

	# old ref with 12mb image for R Pi https://www.cnx-software.com/2013/07/05/12mb-minimal-image-for-raspberry-pi-using-the-yocto-project/
	#########################################################
	# 2018 - yocto for R Pi - http://www.jumpnowtek.com/rpi/Raspberry-Pi-Systems-with-Yocto.html
	# install dependency on build machine/server
	sudo apt install build-essential chrpath diffstat gawk libncurses5-dev texinfo python2.7
	#
	#get main Yocto project poky layer
	git clone -b rocko git://git.yoctoproject.org/poky.git poky-rocko
	cd poky-rocko
	#get the dependency layers - repositories shouldn’t need modifications other then periodic updates and can be reused for different projects or different boards.

	#!/bin/bash

	usage()
	{
	cat << EOF
	usage: $0 options

	This script set ownership for all table, sequence and views for a given database

	Credit: Based on http://stackoverflow.com/a/2686185/305019 by Alex Soto