Loris Strozzini l0ris

#System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

##Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

General OpenSSL Commands

These commands allow you to generate CSRs, Certificates, Private Keys and do other miscellaneous tasks.

Generate a new private key and Certificate Signing Request

openssl req -out CSR.csr -new -newkey rsa:2048 -nodes -keyout privateKey.key

Generate a self-signed certificate (see How to Create and Install an Apache Self Signed Certificate for more info)

A curated list of AWS resources to prepare for the AWS Certifications

A curated list of awesome AWS resources you need to prepare for the all 5 AWS Certifications. This gist will include: open source repos, blogs & blogposts, ebooks, PDF, whitepapers, video courses, free lecture, slides, sample test and many other resources.

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	Videos
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	DevOps

	What is DevOps? by Rackspace - Really great introduction to DevOps
	https://www.youtube.com/watch?v=_I94-tJlovg

	Sanjeev Sharma series on DevOps (great repetition to really get the DevOps concept)

	data "template_file" "main" {
	template = <<EOF
	set -e
	WORKDIR=/tmp/${uuid()}
	mkdir -p "$WORKDIR"
	cd "$WORKDIR"
	curl -f "https://s3.amazonaws.com/aws-cli/awscli-bundle.zip" -o "awscli-bundle.zip"
	unzip awscli-bundle.zip
	./awscli-bundle/install -i "$WORKDIR"/aws

	#!/usr/bin/env bash

	mkdir -p /data
	mdadm --create --verbose --level=0 /dev/md0 --name=DATA --raid-devices=4 /dev/nvme0n1 /dev/nvme1n1 /dev/nvme2n1 /dev/nvme3n1
	mdadm --wait /dev/md0
	mkfs.ext4 /dev/md0
	mdadm --detail --scan >> /etc/mdadm.conf
	dracut -H -f /boot/initramfs-$(uname -r).img $(uname -r)
	echo /dev/md0 /data ext4 defaults,nofail,noatime,discard 0 2 >> /etc/fstab
	mount -a