Tristan Helmich fadenb

System Design Cheatsheet

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

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?

	#!/usr/bin/env bash

	set -Eeuo pipefail
	trap cleanup SIGINT SIGTERM ERR EXIT

	script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)

	usage() {
	cat <<EOF
	Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f] -p param_value arg1 [arg2...]

	################################################################
	################################################################
	## ##
	## This module now lives in a repository! ##
	## https://github.com/dali99/nixos-matrix-modules ##
	## ##
	## It has a few fixes, and quite a few more features, ##
	## like easy workers and automatic nginx config ##
	## ##
	################################################################

	#!/usr/bin/env nix-shell
	#!nix-shell -i bash -p go go2nix

	# little script to help with the stupid go packaging
	# cd into the dir where you want to have the `default.nix`

	# go package name (e.g. github.com/go/is-stupid)
	PACKAGE="$1"
	# git upstream link
	GIT="$2"

	# Create an access token for user "admin" with name "test-1234"
	# POST /users/{username}/tokens/{name}
	$ curl -i -u admin:admin -H 'Accept: application/json' -X POST 'http://127.0.0.1:12900/users/admin/tokens/test-1234?pretty=true'
	HTTP/1.1 200 OK
	X-Graylog-Node-ID: cd03ee44-b2a7-4824-be16-bb7456149dbd
	Content-Type: application/json
	Date: Mon, 08 Aug 2016 12:12:09 GMT
	Content-Length: 139

	{

	# GROK Custom Patterns (add to patterns directory and reference in GROK filter for iptables events):
	# GROK Patterns for iptables Logging Format
	#
	# Created 6 Aug 2016 by Brian Turek <[email protected]>
	# Most of this was taken from another source but now I cannot find it for credit
	#
	# Usage: Use the IPTABLES pattern

	NETFILTERMAC %{MAC:dest_mac}:%{MAC:src_mac}:%{ETHTYPE:ethtype}
	ETHTYPE (?:(?:[A-Fa-f0-9]{2}):(?:[A-Fa-f0-9]{2}))

	Server 2 sockets,6 cores each, 2.4ghz

	# Set ixgbe options
	# Limit RSS queues to the number of physical cores per cpu
	# Disable offload
	# When you change this, you need to run the command and reboot for it to take.
	echo "options ixgbe LRO=0,0 MQ=1,1 RSS=6,6 VMDQ=0,0 vxlan_rx=0,0" > /etc/modprobe.d/ixgbe.conf

	# Shut down HT cores
	for i in $(seq 1 2 23); do

	sudo apt install libresample1
	wget http://mirrors.kernel.org/ubuntu/pool/universe/liba/libav/libavutil52_9.18-0ubuntu0.14.04.1_amd64.deb
	sudo dpkg -i libavutil52_9.18-0ubuntu0.14.04.1_amd64.deb
	wget http://mirrors.kernel.org/ubuntu/pool/universe/liba/libav/libswscale2_9.18-0ubuntu0.14.04.1_amd64.deb
	sudo dpkg -i libswscale2_9.18-0ubuntu0.14.04.1_amd64.deb
	wget https://www.dropbox.com/s/gg2i5wszrqkhzy8/clickshare_01.07.01-79_amd64.deb?dl=0#
	sudo dpkg -i clickshare_01.07.01-79_amd64.deb